TLE7368 Next Generation Micro Controller Supply Automotive P

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TLE7368 Next Generation Micro Controller Supply Automotive P

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Data Sheet, Rev. 1.1, November 2007
TLE7368
Next Generation Micro Controller Supply
Automotive Power
TLE7368
Table Contents
Table Contents
5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.10 6.4.1 Overview Block Diagram Configuration Assignment Definitions Functions TLE7368G General Product Characteristics Absolute Maximum Ratings Functional Range Thermal Resistance Electrical Characteristics Detailed Internal Circuits Description Buck Regulator Buck Regulator Control Scheme High Side Driver Supply 100% Duty Cycle Operation Electromagnetic Emission Reduction Charge Pump Buck Converter Protection Circuits Linear Regulators Voltage Tracking Regulators Power Power Down Sequencing Stand-by Regulator Overtemperature Protection Device Enable Function Reset Function Monitoring Circuit Watchdog Circuit Application Information Choosing Components Buck Regulator Setting LDO1, LDO2 Setting LDO3 Setting Stand-by Regulator Stand-by Regulator's Output Voltage Configuration
Package Outlines Revision History
Data Sheet
Rev. 1.1, 2007-11-08
Next Generation Micro Controller Supply
TLE7368
Features
Overview
High efficient next generation microcontroller power supply system Wide battery input voltage range Operating temperature range +150 Pre-regulator over power loss: Integrated current mode Buck converter V/2.5 Post-regulators, e.g. system controller supply: LDO1: ±2%, current limit LDO2: 2.6V (selectable output), current limit Integrated linear regulator control circuit supply controller cores: LDO3 control external power stage: Post-regulators board supply: Tracking regulators following main Stand-by regulator with lowest current consumption: Linear voltage regulator stand-by supply e.g. memory circuits Hardware selectable output voltages Independent battery input, separated from Buck regulator input Hardware controlled on/off logic Undervoltage detection: Undervoltage reset circuits with adjustable reset delay time power Undervoltage monitoring circuit stand-by supply Window watchdog circuit Overcurrent protection regulators Power sequencing controller supplies Overtemperature shutdown Packages: Rthja power P-DSO-36-12; small exposed PG-DSO-36-24 PG-DSO-36-24 only: Green Product (RoHS compliant) Qualified
P-DSO-36-12
PG-DSO-36-24
Type TLE7368G TLE7368E Data Sheet
Package P-DSO-36-12 PG-DSO-36-24
Marking TLE7368 TLE7368
Remark RoHS compliant Rev. 1.1, 2007-11-08
TLE7368
Overview Description TLE7368 device multifunctional power supply circuit especially designed Automotive powertrain systems using standard battery. device intended supply monitor next generation 32-bit microcontroller families lithography) where voltage levels such required. regulator follows concept predecessor TLE6368/SONIC, where output pre-regulator feeds inputs micro's linear supplies. detail, TLE7368 cascades Buck converter with linear regulators voltage followers achieve lowest power dissipation. This configuration allows power application even high ambient temperatures. step-down converter delivers pre-regulated voltage with minimum peak current capability Supplied this step down converter drop linear post-regulators offer (2.6 with high accuracy. current capability regulators (2.6 linear regulator does have input allowing insert dropper from Buck output reduce chip power dissipation necessary. same reason, reduction chip power dissipation, core supply follows concept integrated control circuit with external power stage. Implementing board microcontroller supplies this described, allows operation even high ambient temperatures. regulator system contains called power sequencing function which provides controlled power sequence three output voltages. addition main regulators inputs voltage trackers connected Buck converter output voltage. Their protected outputs follow main linear regulator with high accuracy able drive loads monitor output voltage levels each linear regulators independent undervoltage detection circuits available. They used implement reset interrupt function. energy saving reasons, e.g. while motor turned off, TLE7368 offers stand-by mode. stand mode enabled disabled either battery microcontroller. this stand-by mode just standby regulator remains active current drawn from battery reduced minimum extended battery lifetime. selection allows configure output voltages stand-by regulator application's needs. input stand-by regulator separated from high power input pre-/post-regulator system. TLE7368 based Infineon's Power technology SPTwhich allows bipolar, CMOS power DMOS circuitry integrated same monolithic chip/circuitry.
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Block Diagram
Block Diagram
INT.BIASING, CHARGE PUMP
C2C1+
CONTROLLER
5.5V
7368
TEMPERATURE SENSE
FB/L_IN Q_T1 Q_T2
EN_µC EN_IGN RO_1 RO_2
ENABLE
Q_LDO1
5.0V
RESET
(WINDOW COMPARATOR)
IN_LDO2 Q_LDO2
2.6/ 3.3V
TIMING
RESET
(WINDOW COMPARATOR) 1.5V
SEL_LDO2 DRV_EXT FB_EXT Q_STBY
1.0/ 2.6V
IN_STBY MON_STBY
WINDOW WATCHDOG
STANDBY MONITOR
SEL_STBY GND_P
GND_A
Figure Block Diagram
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Configuration
Configuration
Assignment
GND_A RO_1 RO_2 N.C. IN_LDO2 Q_LDO2 Q_T1 Q_T2 EN_uC EN_IGN SEL_STBY C1C2C1+ GND_P MON_STBY IN_STBY Q_STBY N.C. N.C. DRV_EXT FB_EXT Q_LDO1 FB/L_IN SEL_Q2 N.C.
GND_A RO_1 RO_2 IN_LDO2 Q_LDO2 Q_T1 Q_T2 EN_uC EN_IGN SEL_STBY C1C2C1+ GND_P GND_A
GND_A MON_STBY IN_STBY Q_STBY DRV_EXT FB_EXT Q_LDO1 FB/L_IN SEL_Q2 GND_A
7368
7368
Figure
Configuration
Definitions Functions TLE7368G
Function Analog ground connection; Connect heatslug resp. exposed pad. Reset watchdog timing pin; Connect ceramic capacitor determine time base reset delay circuits watchdog cycle time Reset output Q_LDO1; Open drain output, active low. Connect external pull-up resistor microcontroller voltage. Reset output Q_LDO2 FB_EXT; Open drain output, active low. Connect external pull-up resistor microcontroller voltage Internally connected; Connect GND_A
Symbol (TLE7368G) (TLE7368E) GND_A
RO_1
RO_2
N.C.
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Configuration Symbol (TLE7368G) (TLE7368E) IN_LDO2 Function LDO2 input; Connect this straight Buck converter output dropper between reduce power dissipation chip. Voltage regulator output; depending state SEL_LDO2. Block with capacitor stable regulator operation; selection capacitor CQ_LDO2 according Chapter Chapter Tracking regulator output; Block with capacitor stable regulator operation; selection capacitor CQ_T1 according Chapter Chapter Tracking regulator output; Block with capacitor stable regulator operation; selection capacitor CQ_T2 according Chapter Chapter Enable input microcontroller; High level enables level disables except stand-by regulators; Integrated pull-down resistor Enable input ignition line; High level enables level disables except stand-by regulators; Integrated pull-down resistor Selection input stand-by regulator; Connect select output voltage Q_STBY; Connect straight Q_STBY select output voltage Q_STBY Charge pump negative Connect ceramic capacitor Charge pump negative Connect ceramic capacitor toC2+ Charge pump positive Connect ceramic capacitor C1Charge pump positive Connect ceramic capacitor C2Charge pump output; Connect ceramic capacitor, GND; Used internal supply, other circuitry. Power ground; Exclusive connection charge pump; Connect this power ground star point PCB. Analog ground connection; Connect exposed pad. Buck regulator input; Connect pi-filter used battery) with short lines; connect filter capacitors case with short lines; connect small ceramic directly pin; details refer Chapter Interconnect pins. Internally connected; Connect GND_A. Rev. 1.1, 2007-11-08
Q_LDO2
Q_T1
Q_T2
EN_uC
EN_IGN
SEL_STBY
C1C2C1+
GND_P
GND_A
Data Sheet
N.C.
TLE7368
Configuration Symbol (TLE7368G) (TLE7368E) SEL_LDO2 Function Selection input LDO2; Connect select output voltage LDO2; Connect straight Q_LDO2 select output voltage LDO2. Window Watchdog input; Apply watchdog trigger signal this Window Watchdog output; Open drain output, active low, connect external pull-up resistor microcontroller voltage Buck power stage's output; Connect both pins directly, short lines, Buck converter circuit, i.e. catch diode Buck inductance Bootstrap driver supply input; Connect buck power stage's driver supply capacitor pins; capacitor selection please refer Chapter Buck converter feedback input plus input LDO1 trackers; Connect output buck converter circuit with short lines these pins; Buck output capacitor selection please refer Chapter Voltage regulator output; output; Block with capacitor stable regulator operation; Selection capacitor CQ_LDO1 according Chapter Chapter External regulator feedback input; Feedback input control loop external power stage regulator. Connect emitter regulating transistor; Block with capacitor stable regulator operation; Selection capacitor CQ_FB_EXT according Chapter Chapter Bipolar power stage driver output; Connect base external transistor directly this pin; Regarding choice external power stage refer Chapter Internally connected; Connect GND_A. Stand-by regulator output; Output voltage depending state SEL_STBY; Block with capacitor stable regulator operation; Selection capacitor CQ_STBY according Chapter Chapter Input stand-by regulator; Always connect reverse polarity protected battery line this pin; Input internal biasing circuits; Block directly with ceramic capacitor; proper choice input capacitors please refer Chapter
FB/L_IN
Q_LDO1
FB_EXT
DRV_EXT
N.C. Q_STBY
IN_STBY
MON_STBY Monitoring output stand-by regulator; power fail active output with special timing, open drain, connect external pull-up resistor. GND_A Analog ground connection; Connect exposed pad.
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics
General Product Characteristics
Absolute Maximum Ratings
Absolute Maximum Ratings
+150 voltages with respect ground.
Pos. Parameter Symbol Min. Stand-by Regulator Input IN_STBY 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.1.7 4.1.8 4.1.9 4.1.10 4.1.11 4.1.12 4.1.13 4.1.14 4.1.15 4.1.16 4.1.17 4.1.18 4.1.19 4.1.20 4.1.21 4.1.22 4.1.23 Voltage Current Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Voltage Current Voltage Current Voltage Current Voltage Voltage Current Limit Values Max. Limited internally Unit Conditions
VIN_STBY IIN_STBY VSEL_STBY VSEL_STBY ISEL_STBY VWDI VWDI IWDI VWDO VWDO IWDO VC<1+, IC<1+, VC<1-, IC<1-, VCCP ICCP VRO_1 VRO_1 IRO_1
-0.3 -0.3 -0.3
Selection Input SEL_STBY
Limited internally Limited internally
Buck Regulator Inputs
-0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3
Watchdog Input
Limited internally
Watchdog Output
Limited internally
Charge Pump Positive C<1+,
Charge Pump Negative C<1-,
Charge Pump Output
Reset Output RO_1
Limited internally
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Absolute Maximum Ratings (cont'd)1)
+150 voltages with respect ground.
Pos. Parameter Symbol Min. Reset Output RO_2 4.1.24 4.1.25 4.1.26 4.1.27 4.1.28 4.1.29 4.1.30 4.1.31 4.1.32 4.1.33 4.1.34 4.1.35 4.1.36 4.1.37 4.1.38 4.1.39 4.1.40 4.1.41 4.1.42 4.1.43 4.1.44 4.1.45 4.1.46 4.1.47 4.1.48 4.1.49 4.1.50 4.1.51 Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Voltage Current Voltage Voltage Current Voltage Voltage Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Limit Values Max. Unit Conditions
VRO_2 VRO_2 IRO_2 VQ_T<1.2> VQ_T<1.2> IQ_T<1.2> VEN_IGN IEN_IGN VEN_uC VEN_uC IEN_uC VQ_LDO1 VQ_LDO2 VQ_LDO<1.2> VQ_LDO<1.2> IQ_LDO<1.2> VSEL_LDO2 VSEL_LDO2 ISEL_LDO2 VDRV_EXT VDRV_EXT IDRV_EXT VFB_EXT VFB_EXT IFB_EXT
-0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3
Limited internally
Reset Timing
Limited internally
Tracking Regulator Outputs Q_T<1.2>
VFB/L_IN 5.5V
mode; VFB/L_IN Limited internally
Enable Ignition EN_IGN
Enable Micro EN_uC
Voltage Regulator Outputs Q_LDO<1.2>
VFB/L_IN VIN_LDO2
Limited internally
Selection Input SEL_LDO2
Limited internally
External Driver Output DRV_EXT
Limited internally
External Regulator Feedback Input FB_EXT
Limited internally
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Absolute Maximum Ratings (cont'd)1)
+150 voltages with respect ground.
Pos. Parameter Symbol Min. Feedback Post-Regulators Input FB/L_IN 4.1.52 4.1.53 4.1.54 4.1.55 4.1.56 4.1.57 4.1.58 4.1.59 4.1.60 4.1.61 4.1.62 4.1.63 4.1.64 4.1.65 4.1.66 4.1.67 4.1.68 4.1.69 4.1.70 4.1.71 4.1.72 Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Voltage Voltage Current Junction Temperature Storage Temperature Electrostatic discharge voltage Electrostatic discharge voltage Limit Values Max. Limited internally Limited internally Limited internally Limited internally Unit Conditions
VFB/L_IN VFB/L_IN IFB/L_IN VIN_LDO2 VIN_LDO2 IIN_LDO2 VBST VBST IBST VQ_STBY VQ_STBY IQ_STBY VMON_STBY VMON_STBY IMON_STBY Tstg VESD
VQ_LDO1
-0.3
Linear Regulator Input IN_LDO2
VQ_LDO2
-0.3
Bootstrap Supply
-0.3 -0.3 -0.3 -0.3 -0.3
Buck Power Stage
Stand-by Regulator Output Q_STBY
Limited internally
Monitoring Output MON_STBY
Limited internally Human Body Model (HBM)3) Charged Device Model (CDM)4) Charged Device Model (CDM)4)
Temperatures
ESD-Protection (Human Body Model)
ESD-Protection (Charged Device Model) 4.1.73 4.1.74
VESD
-500 -750
Electrostatic discharge VESD voltage, corner pins
subject production test, specified design. Exposure those absolute maximum ratings extended periods time affect device reliability. According JEDEC standard EIA/JESD22-A114-B (1.5 According EIA/JESD22-C101 ESDA STM5.3.1
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Note: Stresses above ones listed here cause permanent damage device. Exposure absolute maximum rating conditions extended periods affect device reliability. Note: Integrated protection functions designed prevent destruction under fault conditions described data sheet. Fault conditions considered "outside" normal operating range. Protection functions designed continuous repetitive operation.
Pos. 4.2.1 4.2.2 4.2.3 4.2.4
Functional Range
Parameter Stand-by input voltage Buck input voltage Peak peak ripple voltage FB/L_IN Junction temperature Symbol Min. Limit Values Max. mVpp
Unit
Conditions
VIN_STBY VFB/L_IN
minimum battery voltage regulators with higher nominal output voltage will able provide full output voltage. Their outputs follow battery with certain drop.
Note: Within functional range operates described circuit description. electrical characteristics specified within conditions given related electrical characteristics table.
Pos.
Thermal Resistance
Parameter Symbol Min. Limit Values Typ. Max.
Unit
Conditions
P-DSO-36-12 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 4.3.7 4.3.8 Junction ambient Junction ambient Junction ambient Junction case Junction ambient Junction ambient Junction ambient Junction case
RthJA RthJA RthJA RthJC RthJA RthJA RthJA RthJC
Footprint only1) Heat sink area 300mm2 Heat sink area 600mm2 Footprint only1) Heat sink area 300mm2 Heat sink area 600mm2
PG-DSO-36-24
Worst case regarding peak temperature; zero airflow; mounted FR4;
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics
Electrical Characteristics
Electrical Characteristics
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. Parameter Symbol Min. Buck Regulator 4.4.1 4.4.2 4.4.3 4.4.4 Switching frequency Current transition rise/fall time Power stage resistance Power stage peak current limit Limit Values Typ. Max.
Unit
Conditions
RON, Buck Ipeak,
slope magnitude fixed internally
ramped down from
VFB/L_IN
4.4.5 4.4.6 4.4.7 4.4.8 4.4.9 4.4.10
Buck converter output voltage Buck converter output voltage
VFB/L_IN VFB/L_IN
IBuck IBuck mA2) increasing decreasing VIN, hyst VIN, VIN,
Bootstrap voltage increasing
Buck converter, turn VIN, threshold Buck converter, turn VIN, threshold Buck converter On/off hysteresis
VIN, hyst
Bootstrap undervoltage VBST_UV, lockout, turn threshold Bootstrap undervoltage VBST_UV, lockout, turn threshold Bootstrap undervoltage VBST_UV, hyst lockout, hysteresis Charge pump voltage
4.4.11
Bootstrap voltage decreasing
4.4.12
VBST_UV, hyst VBST_UV, VBST_UV, CCCP CCCP
Charge Pump 4.4.13
VCCP
4.4.14
Charge pump voltage
VCCP
13.5
4.4.15
Charge pump switching fCCP frequency
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Electrical Characteristics (cont'd)
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. Parameter Symbol Min. Voltage Regulator Q_LDO1 4.4.16 4.4.17 4.4.18 4.4.19 4.4.20 4.4.21 Load regulation Power supply ripple rejection VQ_LDO1 Limit Values Typ. Max. 1600 IQ_LDO1 mA3) Unit Conditions
VQ_LDO1 Output current limitation IQ_LDO1, Drop voltage Vdr, Q_LDO1
Output voltage
VQ_LDO1 IQ_LDO1 IQ_LDO1 V;3)
VFB/L_IN V;3)
mV/A
PSRRQ_LD
VFB/L_IN VFB/L_IN, ripple fFB/L_IN, ripple kHz; IQ_LDO1 CQ_LDO1 X7R1)
4.4.22 4.4.23
Output capacitor Output capacitor
CQ_LDO1
kHz1)
CQ_LDO1
Voltage Regulator Q_LDO2 4.4.24 Output voltage
VQ_LDO2
3.23
3.37
SEL_LDO2 Q_LDO2; IN_LDO2 FB/L_IN; IQ_LDO2 SEL_LDO2 Q_LDO2; IN_LDO2 FB/L_IN; VQ_LDO2 SEL_LDO2 Q_LDO2; VCCP IQ_LDO2 mA;4) SEL_LDO2 Q_LDO2; VCCP IQ_LDO2 V;4)
4.4.25
Output current limitation IQ_LDO2,
1400
4.4.26
Drop voltage
Vdr, Q_LDO2
4.4.27
Drop voltage
Vdr, Q_LDO2
4.4.28 4.4.29
Load regulation Output voltage
VQ_LDO2
2.56
2.67
mV/A mode IQ_LDO2 SEL_LDO2 GND; IN_LDO2 FB/L_IN; IQ_LDO2 SEL_LDO2 GND; IN_LDO2 FB/L_IN; VQ_LDO2 SEL_LDO2 GND; VCCP IQ_LDO2 mA;4)6)
VQ_LDO2
4.4.30
Output current limitation IQ_LDO2,
1400
4.4.31
Drop voltage
Vdr, Q_LDO2
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Electrical Characteristics (cont'd)
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. 4.4.32 Parameter Drop voltage Symbol Min. Limit Values Typ. Max. SEL_LDO2 GND; VCCP IQ_LDO2 V;4)6) Unit Conditions
Vdr, Q_LDO2
4.4.33 4.4.34
Load regulation Power supply ripple rejection
VQ_LDO2
mV/A mode IQ_LDO2
PSRRQ_LDO2
VIN_LDO2 VIN_LDO2, ripple fIN_LDO2, ripple kHz; IQ_LDO2 250mA; CQ_LDO2 ceramic
X7R1)
1)5)
4.4.35 4.4.36 4.4.37
Selector Pull-down resistor Output capacitor Output capacitor
RSEL_LDO2 CQ_LDO2
kHz;1)
CQ_LDO2
External Voltage Regulator Control 4.4.38 4.4.39 4.4.40 4.4.41
IDRV_EXT, Feedback voltage VFB_EXT Feedback input current IFB_EXT Load regulation VFB_EXT
Driver current limit
1.51 -250
1.55
VFB_EXT
mV/A VFB/L_IN VCCP IFB_EXT A;7)
1)5)7)
4.4.42 4.4.43
Output capacitor Output capacitor
CFB_EXT
kHz;1)
CFB_EXT
Voltage Tracker Q_T1 4.4.44 4.4.45 4.4.46 Output voltage tracking VQ_T1 accuracy Q_LDO1 Output current limitation IQ_T1 Drop voltage IQ_T1
Vdr, Q_T1
4.4.47
Power supply ripple rejection
PSRRQ_T1
VQ_T1 IQ_T1 VFB/L_IN VQ_LDO1 VFB/L_IN VFB/L_IN, ripple fFB/L_IN, ripple kHz; VQ_LDO1 IQ_T1 CQ_T1 4.7µF ceramic X7R;1)
1)5)
4.4.48 4.4.49
Output capacitor Output capacitor
CQ_T1 CQ_T1
kHz;1) Rev. 1.1, 2007-11-08
Data Sheet
TLE7368
General Product Characteristics Electrical Characteristics (cont'd)
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. Parameter Symbol Min. Voltage Tracker Q_T2 4.4.50 4.4.51 4.4.52 Output voltage tracking VQ_T2 accuracy Q_LDO1 Output current limitation IQ_T2 Drop voltage IQ_T2 Limit Values Typ. Max. Unit Conditions
Vdr, Q_T2
4.4.53
Power supply ripple rejection
PSRRQ_T2
VQ_T2 IQ_T2 VFB/L_IN VQ_LDO1 VFB/L_IN VFB/L_IN, ripple fFB/L_IN, ripple kHz; VQ_LDO1 IQ_T2 CQ_T2 ceramic X7R;1)
1)5)
4.4.54 4.4.55 4.4.56
Output capacitor Output capacitor Output voltage
CQ_T2 CQ_T2 VQ_STBY
0.93
1.02
1.08
kHz;1)
Stand-by Regulator
VIN_STBY IQ_STBY SEL_STBY Q_STBY VIN_STBY IQ_STBY
SEL_STBY Q_STBY
4.4.57
Output voltage
VQ_STBY
0.93
1.02
1.08
4.4.58
Output voltage
VQ_STBY
2.51
2.62
2.73
VIN_STBY IQ_STBY SEL_STBY
SEL_STBY
4.4.59 4.4.60 4.4.61
Selector pull-up current ISEL_STBY Output current limitation IQ_STBY, Load regulation STBY
STBY IQ_STBY 100µA VIN_STBY
SEL_STBY Q_STBY VQ_STBY 1.0V
IQ_STBY 100µA VIN_STBY
SEL_STBY VQ_STBY 2.6V
4.4.62 4.4.63
Line regulation Power supply ripple rejection
STBY
mV/V
PSRRQ_STBY
VIN_STBY, ripple fIN_STBY, ripple IQ_STBY CQ_STBY ceramic X7R;1)
4.4.64
Output capacitor
CQ_STBY
0.47
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Electrical Characteristics (cont'd)
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. 4.4.65 Parameter Output capacitor Symbol Min. Limit Values Typ. Max. kHz;1) Unit Conditions
CQ_STBY
Device Enable Blocks Quiescent Current 4.4.66 4.4.67 Ignition turn threshold Ignition turn threshold Ignition pull-down resistor current Turn threshold Turn threshold
VEN_IGN, VEN_IGN,
Device operating Only stand-by regulators active VEN_IGN VEN_IGN, VEN_uC VEN_uC,
4.4.68 4.4.69 4.4.70
IEN_IGN VEN_uC, VEN_uC,
-100
VEN_IGN 13.5
Device operating Only stand-by regulators active VEN_IGN VEN_IGN, VEN_uC VEN_uC,
4.4.71 4.4.72
Pull-down resistor current Quiescent current
IEN_uC
VEN_uC VEN_uC VEN_IGN
SEL_STBY Q_STBY; MON_STBY IQ_STBY
IIN_STBY -120 IQ_STBY
4.4.73
Quiescent current
IIN_STBY -130 IQ_STBY
VEN_uC VEN_IGN
SEL_STBY GND; MON_STBY IQ_STBY
4.4.74
Quiescent current
VEN_uC VEN_IGN VIN_STBY VQ_LDO1 decreasing; VFB/L_IN open; VQ_LDO1 increasing
Reset Generator RO_1 Monitoring Q_LDO1 4.4.75 4.4.76 4.4.77 4.4.78 4.4.79 4.4.80 4.4.81 Undervoltage Reset threshold Q_LDO1 Undervoltage Reset threshold Q_LDO1 Undervoltage Reset hysteresis Overvoltage Reset threshold Q_LDO1 Overvoltage Reset threshold Q_LDO1 Overvoltage Reset hysteresis
VURT Q_LDO1, 4.50
4.75 4.90 5.65 5.60
VURT Q_LDO1, 4.55
VURO_1, hyst
VORT Q_LDO1, 5.40
VQ_LDO1 increasing VQ_LDO1 decreasing
VORT Q_LDO1, 5.25
VORO_1, hyst
RO_1, Reset output VRO_1, voltage
IRO_1 VQ_LDO1
Rev. 1.1, 2007-11-08
Data Sheet
TLE7368
General Product Characteristics Electrical Characteristics (cont'd)
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. 4.4.82 Parameter Symbol Min. RO_1, Reset output VRO_1, voltage RO_1, Reset output leakage Reset delay time base Reset timing capacitor range Undervoltage Reset reaction time Overvoltage Reset reaction time Limit Values Typ. Max. 0.25 Unit Conditions
4.4.83 4.4.84 4.4.85 4.4.86 4.4.87 4.4.88
IRO_1, high Tcycle
41.6 0.33
62.5
VIN_STBY VQ_LDO1 2.5V; IRO_1 -500 VRO_1
Reset delay time RO_1 tRD, RO_1
Tcycle
Voltage step Q_LDO1 from 5.00 4.48 Buck converter operating; Voltage step Q_LDO1 from 5.00 5.67 SEL_LDO2 Q_LDO2; VQ_LDO2 decreasing; VIN_LDO2 open SEL_LDO2 Q_LDO2; VQ_LDO2 VURT Q_LDO2, VQ_LDO2 IQ_LDO2
tUVRR, RO_1 tOVRR, RO_1
Reset Generator RO_2 Monitoring Q_LDO2 FB_EXT 4.4.89 Undervoltage Reset threshold Q_LDO2
VURT Q_LDO2, 3.135
3.230
4.4.90
Undervoltage Reset VURT Q_LDO2, headroom Q_LDO2 head
117.5
VURT Q_LDO2, head
4.4.91
Undervoltage Reset hysteresis Q_LDO2 Overvoltage Reset threshold Q_LDO2 Overvoltage Reset threshold Q_LDO2 Overvoltage Reset hysteresis Undervoltage Reset threshold Q_LDO2
VURO_2, hyst
SEL_LDO2 Q_LDO2;
VURO_2, hyst VURT Q_LDO2, VURT Q_LDO2,
3.85 3.80 2.560 SEL_LDO2 Q_LDO2; VQ_LDO2 increasing SEL_LDO2 Q_LDO2; VQ_LDO2 decreasing SEL_LDO2 Q_LDO2; SEL_LDO2 GND;
4.4.92 4.4.93 4.4.94 4.4.95
VORT Q_LDO2, 3.70
VORT Q_LDO2, 3.55
VORO_2, hyst
VURT Q_LDO2, 2.485
VQ_LDO2 decreasing; VIN_LDO2 open
SEL_LDO2 GND;
4.4.96
Undervoltage Reset VURT Q_LDO2, headroom Q_LDO2 head
VURT Q_LDO2, head VQ_LDO2 VURT Q_LDO2, VQ_LDO2 IQ_LDO2
SEL_LDO2 GND;
4.4.97
Undervoltage Reset hysteresis Q_LDO2
VURO_2, hyst
VURO_2, hyst VURT Q_LDO2, VURT Q_LDO2,
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Electrical Characteristics (cont'd)
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. 4.4.98 4.4.99 4.4.100 4.4.101 Parameter Overvoltage Reset threshold Q_LDO2 Overvoltage Reset threshold Q_LDO2 Overvoltage Reset hysteresis Q_LDO2 Undervoltage Reset threshold FB_EXT Undervoltage Reset headroom FB_EXT Undervoltage Reset hysteresis FB_EXT Overvoltage Reset threshold FB_EXT Overvoltage Reset threshold FB_EXT Overvoltage Reset hysteresis FB_EXT Symbol Min. Limit Values Typ. Max. 2.95 1.480 SEL_LDO2 GND; Unit Conditions
VORT Q_LDO2, 2.85
VQ_LDO2 increasing
SEL_LDO2 GND; VQ_LDO2 decreasing SEL_LDO2 GND;
VORT Q_LDO2, 2.73
VORO_2, hyst VURT FB_EXT,
1.425
4.4.102
VFB_EXT VURT FB_EXT,
VFB_EXT decreasing; VFB/L_IN VQ_LDO2 3.3/2.6 VFB/L_IN VQ_LDO2 3.3/2.6 VFB_EXT IFB_EXT
4.4.103 4.4.104 4.4.105 4.4.106 4.4.107 4.4.108 4.4.109 4.4.110 4.4.111
VURO_2, hyst
1.72 1.67 0.25
VORT FB_EXT, 1.65
VFB_EXT increasing VFB_EXT decreasing
VORT FB_EXT, 1.55
VORO_2, hyst
RO_2, Reset output VRO_2, voltage RO_2, Reset output VRO_2, voltage RO_2, Reset output leakage Undervoltage Reset reaction time Undervoltage Reset reaction time Overvoltage Reset reaction time
IRO_2, high
IRO_2 VQ_LDO2 IRO_2 -500 VQ_LDO2 VRO_2
Reset delay time RO_2 tRD, RO_2
Tcycle
Voltage step Q_LDO2 from
tUVRR, RO_2
VQ_LDO2, VURT Q_LDO2,
Voltage step FB_EXT from VFB_EXT, VURT FB_EXT, Buck converter operating; Voltage step Q_LDO2 from VQ_LDO2, VORT Q_LDO2, Buck converter operating; Voltage step FB_EXT from VFB_EXT, VORT FB_EXT,
4.4.112
tUVRR, RO_2
4.4.113
tOVRR, RO_2
4.4.114
Overvoltage Reset reaction time
tOVRR, RO_2
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Electrical Characteristics (cont'd)
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. Parameter Symbol Min. Monitoring Block 4.4.115 MON_STBY, Threshold Q_STBY Limit Values Typ. Max. Unit Conditions
VMON, Q_STBY, 0.90
VIN_STBY SEL_STBY Q_STBY; VQ_STBY decreasing;
4.4.115a MON_STBY headroom VMON, Q_STBY,
head
VIN_STBY
SEL_STBY Q_STBY; VQ_STBY decreasing;
4.4.116 4.4.117
MON_STBY hysteresis VMON_STBY,
hyst
2.50
SEL_STBY Q_STBY
MON_STBY, Threshold Q_STBY
VMON, Q_STBY, 2.36
VIN_STBY SEL_STBY GND; VQ_STBY decreasing;
SEL_STBY
4.4.118 4.4.119
MON_STBY hysteresis VMON_STBY,
hyst
MON_STBY, Monitoring output voltage
VMON_ STBY,
IMON_STBY1 VIN_STBY
diagram section "Monitoring Circuit" Page
4.4.120
MON_STBY time delay tMON_ STBY
tRD,
RO_1
4.4.121
Monitor reaction time
tRR, MON_STBY
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
General Product Characteristics Electrical Characteristics (cont'd)
VIN_STBY 13.5 +150 VCCP SEL_STBY Q_STBY; voltages with respect ground.
Pos. Parameter Symbol Min. Window Watchdog 4.4.122 4.4.123 4.4.124 4.4.125 4.4.126 4.4.127 4.4.128 H-input voltage threshold L-input voltage threshold pull-up resistor Limit Values Typ. Max. connected Q_LDO2 Watchdog will start/initialized kept this period RO_2 released Unit Conditions
VWDI, high VWDI,
RWDI Watchdog cycle time Window duration (OW, tWD,
Window duration (IW) Window watchdog initialization time Watchdog output voltage Watchdog output leakage current Overtemperature shutdown Overtemperature shutdown hysteresis
Tcycle
tWD, tWD, start
4.4.129 4.4.130
VWDO,low IWDO,leak
IWDO
state High
Thermal Shutdown 4.4.131 4.4.132
shtdwn
Specified design, subject production test. Tested according measurement circuit VCCP supplied externally with voltage according actual value VCCP measurement. Vdr, Q_LDO1 VFB/L_IN VQ_LDO1; Vdr, Q_LDO2 VIN_LDO2 VQ_LDO2; Vdr, T<1, VFB/L_IN VQ_T<1, Minimum value given needed regulator stability; application might need higher capacitance than minimum. Measured when VQ_LDO2 dropped from nominal value obtained VIN_LDO2 External power transistor type: Fairchild KSH200. Permanent operation device above degrades lifetime; please refer quality information.
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
Detailed Internal Circuits Description
following main circuit blocks TLE7368, namely Buck converter, linear regulators, trackers, charge pump, enable reset circuits watchdog described more detail.
Buck Regulator
TLE7368's converter features functions necessary implement high efficient, emission Buck regulator with minimum external components. step down regulator TLE7368 follows concept similar predecessor, TLE6368, which allows operation over battery voltage range from maximum peak currents minimum. Figure shows block diagram converter with major components, i.e. internal DMOS power stages, high side driver including supply scheme, power stage slope control circuit reduced EME, current mode control scheme various protection circuits safe converter operation.
5.1.1
Buck Regulator Control Scheme
step down converter's control method based upon current mode control scheme. Current mode control provides inherent line feed forward, cycle cycle current limiting ease loop compensation. external compensation components needed stabilize loop, i.e. operation Buck converter. slope compensation circuit addition current sense amplifier error amplifier prevents instabilities/sub harmonic oscillations duty cycles higher than 0.5. cycle cycle current limiting feature supports also soft start feature during power Additional implemented current blanking prevents faulty DMOS turn signals during switching operation.
5.1.2
High Side Driver Supply 100% Duty Cycle Operation
supply concept Buck converter's power stage driver follows Bootstrapping principle. small external capacitor, placed between pins BST, used provide necessary charge gate power stage. capacitor refreshed each switching cycle while power stage turned resulting ability power gate next turn power stage. cases where input/battery voltage approaches nominal Buck converter output voltage, duty cycle converter increases. point where power stage statically turned (100% duty cycle) refresh Bootstrap capacitor described above possible. this case charge pump helps accomplish gate over drive order keep power stage turned with Rdson. With decreasing input voltage, shortly before switching 100% duty cycle, device operates pulse skipping mode. this mode device appears operating much lower frequencies with very small duty cycles. real, device doing 100% duty cycle periods followed period with duty cycle smaller than
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
Bootstrap charger
DMOS power stages
High side driver
Charge pump
Under voltage shutdown
Level shifter
Slope control
Level shifter Current comparator Over temp. shutdown
Over voltage shutdown
Slope compensation
Oscillator
Current sense amplifier
OTSD
Figure
Buck Converter Block Diagram
5.1.3
Electromagnetic Emission Reduction
Buck DMOS power stage implemented multiple cells. This allows control slope power stage's current turn on/off sequentially turning on/off cells, achieving smooth turn on/off therefore avoiding high frequency components electromagnetic emissions battery line. current slope control adjusted internally, typical current slew rate ns/A. Data Sheet Rev. 1.1, 2007-11-08
Error amplifier
FB/L_IN
TLE7368
Detailed Internal Circuits Description
5.1.4
Charge Pump
charge pump serves support circuit Buck converter's high side driver supply, linear regulators drive circuits drop operation internal device biasing blocks. order guarantee full device operation battery voltages allow even concept voltage tripler chosen charge pump. operates switching frequency typical utilizing three small external capacitors, pumping caps storage capacitor. circuit equipped with current limit function which avoids destruction case short external capacitors. charge pump's output, CCP, designed supply circuitry described above, should used e.g. driver rail external board/PCB circuits.
5.1.5
Buck Converter Protection Circuits
Besides circuits mandatory Buck converter operation additional protection circuits foreseen which help preventing false operation device. Undervoltage lockouts foreseen battery input line1) high side driver supply rail ensure device operates only with proper voltages present. overvoltage shutdown Buck converter output provides safe high side shutdown case where Buck control loop becomes messed predictable circumstances. overtemperatures thermal shutdown circuit disables Buck converter until device cools down enabled again.
Linear Regulators
TLE7368 features three linear voltage regulator circuits, fully integrated DMOS drop voltage regulators integrated linear control circuit operate with external power stage. Integrated linear regulator (LDO1) offers output second integrated linear regulator (LDO2) configured with SEL_LDO2 either With SEL_LDO2 tied will adjust output LDO2, SEL_LDO2 being connected Q_LDO2 gives option. external regulator will adjust output with emitter power stage directly connected FB_EXT, using voltage divider, higher output voltages achieved. regulators designed drop operation offer high output voltage accuracies meet needs current next generation 32-bit microcontroller families. Additionally regulators feature short circuit protection, i.e. integrated regulators contain output current limit function whereas control circuit external power stage limits maximum base current. chip power dissipation input LDO1 internally directly connected Buck converter output (FB/L_IN). LDO2's input purpose externally accessible IN_LDO2. This allows insertion drop element between Buck converter output IN_LDO2 split power dissipation avoid high losses TLE7368. Similar external power stage regulator, collector either connected directly Buck converter output drop element inserted between split power dissipation.
Voltage Tracking Regulators
board/off supplies, i.e. sensors, voltage tracking regulators incorporated TLE7368. Their outputs follow output main regulator, Q_LDO1, within tight tolerance tracking regulators implemented with bipolar power stages improved ripple rejection reduce emission when lead board. Both tracker outputs withstand short circuits battery range When shorted lower levels than nominal output voltage level current limit function prevents excessive current draw.
shown schematic, Figure
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
Power Power Down Sequencing
supply system with multiple outputs sequence enabling individual regulators important. Especially 32-bit microcontrollers require defined power power down sequencing. Figure shows details power power down sequence TLE7368. power first circuit block enabled charge pump mandatory other circuits operate. With charge pump reaching nominal value, Buck converter starts power output. Also output voltage linear regulators enabled. three linear regulators power simultaneously. regulator acts master, V/2.6 regulator regulator follow. regulator powers also tracking regulators follow. ramp increasing output voltage each line determined connected output capacitance, load current current limit regulator under consideration. addition integrated supervision circuit ensures following conditions during power-up: -0.3 (VQ_LDO1 VQ_LDO2) -0.3 (VQ_LDO2 VFB_EXT)
power down sequence practically vice versa start procedure. With battery decreasing zero charge pump Buck regulator will stop operate minimum battery threshold, Buck output voltage will fall down will outputs linear regulators. event where device disabled, EN_IGN EN_uC low, charge pump, Buck converter linear regulators disabled immediately. linear regulators' outputs discharged actively case power down. Diode circuitry (i.e. Schottky diodes) might necessary avoid violation certain microcontrollers' sequencing requirements.
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
VIN, VCCP VCCP, VBST VBST, VIN,
VFB/L_IN VQ_LDO1 drop depending application setup VQ_LDO2 VQ_LDO1
-0.3 (Q_LDO1-Q_LDO2) 3.1V
VFB_EXT VQ_LDO2
-0.3 Q_LDO2 FB_EXT)
Linear regulators actively discharged power down; externa Schottky diodes required meet uC"s sequencing requirements
VQ_T<1,2> VQ_LDO1
Figure
Power Sequencing TLE7368
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
Stand-by Regulator
intention stand-by keep alive regulator supply e.g. external memory even with main microcontroller supply being disabled. Therefore state stand-by regulator controlled enable block, active time. stand-by regulator starts operate soon battery voltage increases above operating threshold. current consumption during single operation stand-by regulator reduced minimum. configured output voltages either through SEL_STBY pin.
Overtemperature Protection
junction temperatures between which caused e.g. excessive power dissipation increased ambient temperatures, overtemperature protection kicks disables Buck converter. With Buck converter disabled linear regulators will most likely able keep their output voltage system reset expected. drop power dissipation junction temperature will decrease. built hysteresis circuit ensures that junction temperature cools down certain temperature delta before Buck converter enabled again.
Device Enable Function
device enable block controls operation Buck converter well linear regulators tracker blocks. external signal inputs determine state those blocks, high voltage input EN_IGN voltage input EN_uC. Internally signals logic OR-ed which means that with either signal Buck linear regulators turned held active, provided that battery voltage above minimum operating range. order turn regulator blocks, signals both inputs, EN_IGN EN_uC must lower than their deactivating threshold. stand-by regulator's operation affected device enable block.
Reset Function
Reset concept TLE7368 chosen support multiple microcontroller platforms. open drain outputs, i.e. Reset outputs, RO_1 RO_2, indicate states different regulators. Figure gives details Reset timing. RO_1 tied LDO1 will indicate whenever output, Q_LDO1, crossing under- overvoltage threshold. second Reset output, RO_2, turns whenever outputs, Q_LDO2 FB_EXT, crossing their under- overvoltage thresholds. power order avoid faulty microcontroller start, called Reset delay function, i.e. Reset release delay, implemented. This delay until reset released, counted from time where regulator outputs cross threshold, determined small external delay capacitor power reset delay time directly proportional capacitance within capacitance range 0.33
CRT/nF
tolerance calculation please refer parameters 4.4.77, 4.4.78 4.4.79. order find worst case limits capacitance tolerance should taken into account. Reset generators within TLE7368 supplied from multiple sources, VIN_STBY, VCCP, VFB_L/IN, VQ_LDO1 VQ_LDO2, fulfill next generation microcontroller requirements during power power down.
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
VFB/L_IN
VQ_LDO1
VORT Q_LDO1, VORT Q_LDO1, VURT Q_LDO1, tOVRR, RO_1 tUVRR, RO_1
VURT Q_LDO1,
VRO_1
tRD, RO_1 tUVRR, RO_1
tRD, RO_1
tRD, RO_1
tUVRR, RO_1
VORT Q_LDO2, VORT Q_LDO2, VURT Q_LDO2, tOVRR, RO_2 VORT FB_EXT, VORT FB_EXT, VURT FB_EXT, tUVRR, RO_2 tOVRR, RO_2 VURT FB_EXT, tUVRR, RO_2 VURT Q_LDO2,
VQ_LDO2 VFB_EXT
tRD, RO_2
tRD, RO_2 tUVRR, RO_2 tOVRR, RO_2
tRD, RO_2 tOVRR, RO_2
tRD, RO_2 tUVRR, RO_2
VRO_2
pulled e.g. Q_LDO1 10kOhm
pulled e.g. Q_LDO2 10kOhm
Figure
Reset Timing TLE7368
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
Monitoring Circuit
monitoring block within TLE7368 detects undervoltage stand-by regulator output able distinguish between different undervoltage situations. When stand-by output gets back into regulation after undervoltage event, timing MON_STBY output signal indicates kind undervoltage scenario which happened before. behavior monitoring block also described Figure Figure below. case undervoltage stand-by regulator with regulator LDO1 regulation (which means that RO_1 HIGH) monitoring circuit basically power fail functionality which means that MON_STBY output will just long undervoltage stand-by output occurs. soon Q_STBY coming back into regulation MON_STBY turns high again. When regulator regulation (RO_1 LOW), e.g. case EN_uC EN_IGN LOW, MON_STBY will turn again undervoltage event happens Q_STBY. difference scenario described above that when Q_STBY gets back into regulation toggling MON_STBY output HIGH coupled with Reset line, RO_1, turning HIGH. detail, MON_STBY line turns high delayed tMON_STBY after Reset line RO_1 gone high.
High
VQ_STBY MON, Q_STBY, RO_1 High
Monitor timing don't care
Q_STBY MON, Q_STBY, RO_1
Q_STBY MON, Q_STBY, RO_1 High
VQ_STBY MON, Q_STBY, RO_1 High
Monitor timing delay
Monitor timing delay
Q_STBY MON, Q_STBY, RO_1
Q_STBY MON, Q_STBY, RO_1
power fail functionionality power reset functionality
Figure
Stand Monitor State Diagram
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
VIN_STBY
VQ_STBY
tRR, MON_STBY1 VMON, Q_STBY, VMON, Q_STBY,
VRO_1
VMON_STBY
tRR, MON_STBY
tMON_STBY
tRR, MON_STBY tRR, MON_STBY
Power reset functionality, with RO_1 during under voltage Q_STBY
Power fail functionality, delay, with RO_1 high during under voltage Q_STBY
output pulled e.g. Q_LDO1 10kOhm
Figure
Stand Monitor Timing Diagram
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description
5.10
Watchdog Circuit
Always
Ignore Window
Trigger During Closed Window
Trigger During Open Window
Always
Trigger Closed Window Trigger
AEA03533.VSD
Open Window
Figure
Window Watchdog State Diagram
Principle Operation: Window Watchdog integrated TLE7368 monitor microcontroller. Window Watchdog duty cycle consists "Open window" "Closed window". microcontroller that being monitored send periodic falling edge trigger signal watchdog input within "Open Window". trigger signal sent sent during "Closed Window", then Watchdog Output (WDO) switches from high signaling potential microcontroller fault occurred. watchdog cycle time derived from time base TCycle. external capacitor connected between pins determines TCycle. Initialization: Watchdog switched default activated pulling least time tWD,start after RO_2 turned high. Watchdog input integrated pull-up resistor RWDI connected Q_LDO2. transitions high before tWD,start elapsed, then watchdog will start operation. initialize Watchdog watchdog input should transition high within "Ignore Window". signal also transition high during following "Open Window", sufficient time must left falling edge transition before "Open Window". watchdog function turned following RO_2 reset, must reinitialized turned back Normal Operation: Please refer Figure Watchdog starts operating "Ignore Window" state duration tWD,IW. Within "Ignore Window" microcontroller given time initialize. signal watchdog input within "Ignore Window" ignored. After time tWD,IW, watchdog transitions from "Ignore Window" state "Open Window" state maximum duration tWD,W. Within "Open Window" valid trigger signal must applied watchdog Data Sheet Rev. 1.1, 2007-11-08
TLE7368
Detailed Internal Circuits Description input WDI. valid trigger signal falling edge from VWDI,high VWDI,low. After receiving valid trigger signal within "Open Window" watchdog immediately terminates "Open Window" enters "Closed Window" state. "Closed Window" fixed duration tWD,W. During normal operation trigger signal should applied during "Closed Window. After "Closed Window" time tWD,W watchdog returns back "Open Window" state. Within "Open Window", valid trigger signal must applied watchdog input WDI. normal operation, watchdog continues cycle between "Open Window" "Closed Window" state. reset signal RO_2 asserted transitions state, then watchdog needs reinitialized described Initialization section. watchdog output stays high long watchdog input triggered correctly. Valid Trigger Signal: Please refer Figure Watchdog input periodically sampled with period TWD. valid trigger signal falling edge from VWDI,high VWDI,low. improve immunity against noise glitches input, least high samples followed samples required valid trigger signal. example, first three samples (two LOW) trigger pulse inside closed window only fourth sample (the second sample) taken open window then watchdog output will remain High. Invalid Triggering: Please refer Figure Figure trigger signal detected during "Open Window" trigger signal detected during "Closed Window", considered invalid triggering. Watchdog output switches duration tWD,W immediately after valid trigger during "Open Window" immediately trigger signal detected during "Closed Window". Fault Operation: capacitor failure watchdog timing causes short circuit GND, then internal oscillator stops operating. Without oscillator operation there time reference watchdog does know when "Closed Window" period ended. Thus, every second trigger signal watchdog input generates watchdog failure causing switch from high low. open circuit also causes switch from high low.
Figure
Window Watchdog Input Signal Validation
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Application Information
Application Information
Note: following information given hint implementation device only shall regarded description warranty certain functionality, condition quality device.
Battery Input
INT.BIASING, CHARGE PUMP
5.5V
CONTROLLER
5.5V
7368
TEMPERATURE SENSE
FB/L_IN Q_T1 sensor
Q_T2 from from EN_µC EN_IGN
ENABLE
sensor
Q_LDO1
5.0V
RO_1
RESET
(WINDOW COMPARATOR)
IN_LDO2 Q_LDO2 e.g. 3.3V
TIMING
2.6/3.3V
RO_2
RESET
(WINDOW COMPARATOR) 1.5V
SEL_LDO2 DRV_EXT FB_EXT e.g. 1.5V e.g. 1.5V
from Keep Alive Input
IN_STBY
WINDOW WATCHDOG
Q_STBY
1.0/2.6V
MON_STBY
STANDBY MONITOR
SEL_STBY
GND_A
GND_P
Figure
Application Diagram, Example
Note: This very simplified example application circuit. function must verified real application.
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Application Information This section intends give hints correct i.e. avoid misbehavior caused influence other board circuits shows also calculate external components, power loss, etc.
Choosing Components Buck Regulator
Stable operation Buck converter ensured when choosing external passive components according characteristics given below: Buck inductance: LBuck Buck output capacitor: CBuck Buck output capacitor: ESR_CBuck
Setting LDO1, LDO2
linear regulators LDO1 LDO2 need connected appropriate output capacitors order keep regulation loop stable avoid oscillations. essential parameters output capacitor minimum capacitance equivalent series resistance (ESR). required ranges each output specified Chapter (Electrical Characteristics). Tantalum capacitors well multi layer ceramic capacitors suitable LDO1 LDO2. Table Q_LDO2 LDO2 Output Voltage Configuration Q_LDO2
SEL_LDO2
Setting LDO3
LDO3 consists integrated regulator which needs equipped with external power transistor (NPNType). Suitable power transistors types e.g. from Fairchild semiconductor 2873T4 from semiconductor. most important parameters checked when choosing external transistor `current gain bandwidth product' (fT), current gain' (hFE) thermal resistance package. Darlington type transistors should used. stability regulation loop multi layer ceramic capacitor min. must connected LDO3 output voltage (Emitter external power transistor). order improve suppression load current steps additional capacitor tantalum type connected parallel. case LDO3 voltage needed external transistor spared. this configuration pins `DRV_EXT' `FB_EXT' should directly connected each other order ensure correct operation Reset Also this case small ceramic capacitor connected from `FB_EXT' recommended order avoid oscillations regulation loop LDO3.
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Application Information
Setting Stand-by Regulator
stand regulator provides output current sourced linear regulation directly from Battery even when main regulator disabled. This quiescent current regulator commonly used supply stand memory. output voltage selected stability regulation loop output Q_STBY should connected ceramic capacitor (470 GND.
6.4.1
Stand-by Regulator's Output Voltage Configuration
stand regulator provides output voltage nominal which associated with appropriate stand-by monitoring threshold. output voltage level selected SEL_STBY configuration. Connecting SEL_STBY results voltage level Q_STBY, while connecting SEL_STBY with Q_STBY leads configuration. integrated pull-up current ensures that system will turn lower stand-by voltage mode case open mode SEL_STBY pin. However SEL_STBY should connected either Q_STBY order select appropriate Q_STBY voltage level. Intermediate voltage levels SEL_STBY should avoided. Table Q_STBY Stand-by Regulator's Output Voltage Configuration Q_STBY
SEL_STBY
Data Sheet
Rev. 1.1, 2007-11-08
TLE7368
Package Outlines
Package Outlines
MAX.
3.25 ±0.1
±0.15
+0.07 -0.02
+0.1
±0.1
0.65
15.74 ±0.1 (Heatslug) 0.25 +0.13
0.25
14.2 ±0.3
Heatslug 0.95 ±0.15 0.25
0.65 11.05
Bottom View
Index Marking
13.7 -0.2
15.9 ±0.1
Does include plastic metal protrusion 0.15 max. side Stand
±0.1
Heatslug
GPS09181
Figure
P-DSO-36-12 (Plastic Dual Small Outline Package)
find packages, sorts packing others Infineon Internet Page "Products": Data Sheet
±0.1
Rev. 1.1, 2007-11-08
Dimensions
TLE7368
Package Outlines
0.0.15 STAND 2.45 -0.2
2.65 MAX.
0.35
0.65 0.65 11.05 0.33 ±0.08 SEATING PLANE
±0.2 10.3 ±0.3
0.17
Bottom View
Exposed Diepad
12.8 -0.21) Index Marking
Index Marking
Does include plastic metal protrusion 0.15 max. side Does include dambar protrusion 0.05 max. side
GPS01153
Figure
PG-DSO-36-24 (Plastic Green Dual Small Outline Package)
Green Product (RoHS compliant) meet world-wide customer requirements environmentally friendly products compliant with government regulations device available green product. Green products RoHS-Compliant (i.e Pb-free finish leads suitable Pb-free soldering according IPC/JEDEC J-STD-020).
find packages, sorts packing others Infineon Internet Page "Products": Data Sheet
MAX.
-0.2
0.23 +0.09
Dimensions Rev. 1.1, 2007-11-08
TLE7368
Revision History
Date
Revision History
Changes Final datasheet both versions, TLE7368G TLE7368E. Page Overview: Updated package pictures. Page Overview: Updated table: Status Final/Target removed. Page Thermal resistance table: Inserted values version TLE7368E. Page Thermal resistance table: Updated values version TLE7368G. 4.4.72/4.4.73: Condition described more precise: Inserted "MON_STBY Figure Modified graph better description window watchdog function. Chapter 5.10 Watchdog: Revised phrasing better understanding Final Datasheet Version TLE7368G; Target Datasheet Version TLE7368E Target Datasheet
2007-11-08 2007-08-13
0.61 2006-12-18
Data Sheet
Rev. 1.1, 2007-11-08
Edition 2007-11-08 Published Infineon Technologies 81726 Munich, Germany 2007 Infineon Technologies Rights Reserved. Legal Disclaimer information given this document shall event regarded guarantee conditions characteristics. With respect examples hints given herein, typical values stated herein and/or information regarding application device, Infineon Technologies hereby disclaims warranties liabilities kind, including without limitation, warranties non-infringement intellectual property rights third party. Information further information technology, delivery terms conditions prices, please contact nearest Infineon Technologies Office (www.infineon.com). Warnings technical requirements, components contain dangerous substances. information types question, please contact nearest Infineon Technologies Office. Infineon Technologies components used life-support devices systems only with express written approval Infineon Technologies, failure such components reasonably expected cause failure that life-support device system affect safety effectiveness that device system. Life support devices systems intended implanted human body support and/or maintain sustain and/or protect human life. they fail, reasonable assume that health user other persons endangered.

TLE7368 Next Generation Micro Controller Supply Automotive P

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