ASSP Power Supply Applications Bi-CMOS Battery Backup M
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DS04-27502-3E
ASSP Power Supply Applications
Bi-CMOS
Battery Backup
MB3790
DESCRIPTION
MB3790 designed control power supplies SRAM, logic other circuit devices protects them against momentary power failures using backup batteries. addition function supply power these devices, function switch source power primary secondary backup battery when power supply voltage drops below predetermined level. Also, outputs reset signal when power supply turns when fault occurs power supply. Ideally designed single-chip power supply control, MB3790 consumes only minimal current comes thin-type package. Therefore, best suited power supply control memory cards similar other devices.
FEATURES
Input circuit current consumption when non-loaded: [typ] Output drive current: [max] Resistance between input output: ohms [typ] Input power-down detection level: On-chip power-on reset circuit Primary battery voltage-down detection levels: 2.65 2.37
(Continued)
PACKAGES
Plastic SOP, Plastic SSOP*,
(FPT-16P-M06)
(FPT-20P-M04)
Since SSOP extremely thin package, partial heating method when mounting device.
MB3790
(Continued) On-chip secondary battery recharging function Output current during battery backup: VBAT1: [max], VBAT2: [max] Leakage current: [max]
ASSIGNMENTS
(TOP VIEW)
N.C. BAT1 BAT2 ALARM1 ALARM2 CONTROL N.C. SENSE RESET RESET N.C. BAT1 BAT2 N.C. N.C. ALARM1 ALARM2
(TOP VIEW)
CONTROL N.C. SENSE N.C. N.C. RESET RESET
(FPT-16P-M06)
(FPT-20P-M04)
MB3790
BLOCK DIAGRAM
=0.5
CONTROL 590K Reference voltage power 1.24V supply circuit
2.65V
ALARM1
SENSE
2.37V
ALARM2
RESET Vth:3V RESET
240K
Vth:1.5V
BAT2
BAT1
MB3790
DESCRIPTION
number Symbol N.C. VBATI VOUT VBAT2 connection This connects primary battery. These pins supply output voltage. (Range output current value IOUT This connects secondary battery. When power supply voltage greater than equal detection level (i.e., VINH), secondary battery recharged using constant-voltage method charging. connection This open-collector output primary battery alarm signal. When power supply voltage greater than equal VINH, monitors primary battery voltage. power supply voltage less than VINL, does monitor primary battery voltage. VBAT1 less than equal 2.65 output voltage forced level. This open-collector output primary battery alarm signal. When power supply voltage greater than equal VINH, monitors primary battery voltage. power supply voltage less than VINL, does monitor primary battery voltage. VBAT1 less than equal 2.37 output voltage forced level. This connects ground This outputs reset signal. When power supply voltage less than equal VINL, outputs High level. power supply voltage SRAM less than designated range, directly controls SRAM disable writes thereby protect data memory. This outputs inverted signal RESET. This used reset pulse width. Insert capacitor between this pulse width. connection This accepts comparator input detecting power supply voltage level. details, refer APPLICATION this data sheet. These pins accept input voltage device. connection This used output control. details, refer APPLICATION this data sheet. Name function
N.C. ALARM1
ALARM2
RESET
RESET N.C. VSENSE N.C. CONTROL
MB3790
FUNCTIONAL DESCRIPTION
Battery Backup Function
When power supply voltage exceeds voltage detection level (i.e., VINH), device outputs current from power supply load circuit VOUT pin. When power supply voltage less than equal VINL, device switches source power VOUT from primary secondary battery backup purposes.
Power Supply Voltage Level Detect Function
When power supply voltage drops below VINL, voltage level detection comparator actuated perform following (note that detection voltage level hysteresis characteristics listed ELECTRICAL CHARACTERISTICS this data sheet): comparator first outputs RESET signal (High level). switches source power load circuit primary secondary battery. power supply voltage detection level adjusted fitting external resistor VSENSE pin. When adjusting detection level, sure higher considering power supply voltage internal circuit operation. addition, detection time extended connecting capacitator. this method adjustment, refer APPLICATION this data sheet.
Reference Voltage Circuit
This temperature-compensated reference voltage circuit band type that outputs trimmingadjusted exact reference voltage. reference voltage power supply used reference voltage/constant current values detection circuit, well secondary battery recharging voltage.
Power-on Reset Function
charging capacitator connected with constant current (approx. µA), this function determines reset pulse width. calculation formula this given below: Reset pulse width (sec) (When 1000 [typ])
Primary Battery Voltage Detection Function
primary battery voltage drops below detection level when power supply voltage greater than equal VINL, device outputs alarm signal (Low level) from CMOS output pin, ALARM1 ALARM2. Note that voltage level detection comparator hysteresis characteristics listed ELECTRICAL CHARACTERISTICS this data sheet. When primary battery voltage 2.65 [typ] less: ALARM1 output forced level issue alarm indicating that it's time replace primary battery. When primary battery voltage 2.37 [typ] less: ALARM2 output forced level issue alarm indicating that primary battery voltage less than voltage necessary retain SRAM data (approx.
Secondary Battery Recharging Function
When power supply voltage greater than equal VINL, device recharges secondary battery using constant-voltage method charging. Note that typical value device's internal recharging resistor ohms.
MB3790
DESCRIPTION OPERATION
Operation When Input Voltage Goes
IN-DV1 BAT1-DVB1
RESET
IN-DV1 BAT1-DVB1
High level RESET
level
High level
level
High level IN-DV1
level
High level
level
High level
level
Power-on While power supply voltage less than VINH (4.3 typ), protected devices such SRAM microprocessor standby mode with power supplied battery. When power supply voltage rises level greater than equal VINH, PMOS transistor between input/ output pins turns power such devices supplied from pin. same time, primary battery voltage detection secondary battery recharging operations actuated. Standby mode When power supply voltage rises level greater than equal VINH, RESET outputs High level duration time devices such SRAM microprocessor held standby mode. Note that duration time adjusted changing capacitance pin. RESET outputs inverted signal RESET pin. Active mode reset signal cleared devices such SRAM microprocessor placed operating mode.
MB3790
Momentary power failure voltage When power supply voltage drops less than equal VINL. (4.2 typ) power supply goes down voltage dips momentarily, RESET outputs High level RESET outputs level. devices such SRAM microprocessor thereby placed standby mode powered from battery. When this mode, primary battery voltage detection secondary battery recharging operations stopped. Note: guarantee backup operation case momentary power failure, make sure V-to-0 fall time more using, example, capacitator.
Alarm Operation
BAT1
BAT2 BAT1
BATH1 BATL1 BATH2 BATL2
ALARM1
ALARM2
primary battery voltage decreases while power supply voltage (VIN) greater than equal VINH (4.3 typ), alarm signals output described below. this time, VBAT1 released open, output from alarm becomes indeterminate. Primary battery replacement alarm (alarm-1 output) primary battery voltage drops VBAT1 (2.65 typ), ALARM1 forced level issue alarm indicating that it's time replace primary battery. Primary battery minimum voltage alarm (alarm-2 output) primary battery voltage further drops VBAT2 (2.37 typ), ALARM2 forced level issue alarm indicating that primary battery power dropped below voltage necessary retain SRAM data (approx.
MB3790
ABSOLUTE MAXIMUM RATINGS
+25°C) Parameter Input voltage Battery voltage Reset output Voltage Alarm output Voltage Output current Output high current Output current Power dissipation Storage temperature Symbol VBAT VRESET VALARM IOUT Tstg Source current Sink current +25°C SSOP Conditions Rating -0.3 -0.3 VOUT 450* 540* +125 Unit
When mounted cm-square double-side epoxy board. WARNING: Permanent device damage occur above ABSOLUTE MAXIMUM RATINGS exceeded. Functional operation should restricted conditions detailed operational sections this data sheet. Exposure absolute maximum rating conditions extended periods affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Parameter Input voltage Battery voltage Output current Output current during battery backup Operating temperature Symbol VBAT IOUT IO(BAT1) IO(BAT2) Supply from primary battery Supply from secondary battery Conditions Value Min. Typ. Max. Unit
MB3790
ELECTRICAL CHARACTERISTICS
characteristics (Recommended operating conditions unless otherwise noted.) (VIN +25°C) Parameter sections Backup Power Supply Section Input current Input/output voltage difference Output delay time Symbol IIN1 VINL Input voltage detection VINH Input voltage hysteresis DVIN width Power Supply Monitoring Section Reset output voltage Reset output voltage during backup VBAT1 Reset pulse width Input pulse width Reset output rise time Reset output fall time Reset output delay time VOHR VOLR VOHR VOLR tpdR Conditions IOUT IOUT IOUT 0.01 30°C 70°C 30°C 70°C VINH VINL IOHR IOLR IOHR IOLR 1000 1000 slew rate V/µs Value Min. 4.10 4.05 4.20 4.15 Typ. 4.20 4.20 4.30 4.30 Max. 4.30 4.35 4.40 4.45 Unit
(Continued)
MB3790
(Continued)
(VIN +25°C) Parameter Symbol VBAT 30°C +70°C VBATH1 voltage detection-1 hysteresis width VBAT 30°C +70°C DVBAT1 VBATH1 VBATL1 VBAT 30°C +70°C VBATH2 Battery-1 Monitoring Section voltage detection-2 hysteresis width voltage detection difference Battery-1 input current VBAT 30°C +70°C DVBAT2 DVBAT IBATA IBATB VBATH2 VBATL2 VBATL1 VBATL2 VBAT VBAT IBAT1 IBAT1 IOHA IOLA overdrive ICHG VCHG IBAT2 Conditions Value Min. 2.55 2.52 2.59 2.56 2.27 2.24 2.31 2.28 0.26 -100 -100 2.80 Typ. 2.65 2.65 2.69 2.69 2.37 2.37 2.41 2.41 0.28 0.30 0.10 3.00 0.10 Max. 2.75 2.78 2.79 2.82 2.47 2.50 2.51 2.54 0.30 0.35 0.15 3.20 0.15 Unit
VBATL1 voltage detection
VBATL2 voltage detection
Battery-1 output voltage difference DVB1 during backup, Alarm output voltage Alarm output rise time Alarm output fall time Alarm output delay time Battery-2 recharging voltage Battery-2 Monitoring Section Battery-2 output voltage difference during backup VOHA VOLA tpdA VCHG
Battery-2 recharging current ICHG DVB2
MB3790
TIMING CHART
Rise/Fall Times Reset Alarm Pins: tr/tf
RESET RESET ALARM1 ALARM2
Reset Pulse Width: tPO; Input Pulse Width: tPI; Reset Output Delay Time: tpdR
IH-DV1
RESET BAT1-DVB2
MB3790
Alarm Output delay time: tpdA
50mV BAT1 50mV BATL1, BATL2
ALARM1 ALARM2
VOUT Output Delay Time:
MB3790
TYPICAL CHARACTERISTIC CURVES
characteristics RESET
characteristics RESET
Output voltage
Output voltage
OPEN BAT1 =+3V
=+5V BAT1 =+3V
-0.2
-0.4
-0.6
-0.8
-1.0
Current (mA) characteristics RESET
Current (mA) characteristics RESET
Output voltage
=+5V BAT1 =+3V -0.4 -0.8 -1.2 -1.6 -2.0
Output voltage
OPEN BAT1 =+3V
Current (mA) characteristics
Current (mA) characteristics
Output voltage
=+5V BAT1 =+3V -1.0 -2.0 -3.0 -4.0 -5.0
Output voltage
=+5V BAT1 =+2V
Current (mA)
Current (mA)
(Continued)
MB3790
(Continued)
Temperature characteristics input current Temperature characteristics battery power detection voltage
=+5V
Battery voltage
BATH1
Input current (µA)
BATL1
BATH2 BATL2
Ambient temperature (°C)
Ambient temperature (°C)
Temperature characteristics power-down detection voltage
Power-down detection voltage
Ambient temperature (°C)
MB3790
APPLICATION
Method Using CONTROL
possible control operation analog switch entering High level CONTROL while being powered battery. Table below shows analog switch operates when operation controlled from CONTROL pin. When using primary secondary batteries combination case memory cards, sure CONTROL High prevent primary battery from being recharged secondary battery current flowing from analog switch Control Conditions CONTROL Operating state Standby/active state Backup state Control conditions Input voltage (VIN) VINL VINL VINL CONTROL pin*1 High/Low High VOUT) GND) ON/OFF State analog switch*2 Analog switch Analog switch
CONTROL released open, logic state CMOS circuit become instable letting current flow into circuit. Therefore, CONTROL must always have High level input. ON-resistance analog switch approximately ohms.
Analog Switch connection Diagram
Analog Switch
Analog Switch
BAT1
BAT2
Connection primary battery
Connection secondary battery
MB3790
Outputting Reset Signal Forcibly
reset signal output forcibly bringing VSENSE MB3790 level 1.24). reset signal held until capacitator charged after VSENSE released open.
Forced Reset Method
VSENSE
Turned (VRESET High)
Forced Reset Method
VSENSE Control signal input
When voltage enough turn approx. gives Control signal input pin, VRESET equal High level.
[Reset Pulse Width Calculation Formula] Reset Pulse Width (sec) (where capacitance) Example: When 1000 (Typ)
MB3790
Adjusting Supply Voltage Detection Level time
MB3790 outputs reset signal when power supply momentarily goes down voltage sags more. time before this reset signal output extended connecting capacitor VSENSE pin.
Adjusting Supply Voltage Detection Level Time
VSENSE
Compatibility with JEIDA Memory Card Guideline Ver.
MB3790 ALM1 ALM2 specifications matched BVD2 BVD1 specifications JEIDA Memory Card Guideline Ver. Therefore, ALM1 ALM2 pins connected directly BVD2 BVD1 pins. Alarm Detection Voltage Levels Name ALM1 ALM2 VBAT1 2.37 level level 2.37 VBAT1 2.65V level High level 2.65 VBAT1 High level High level Connected BVD2 BVD1
VBAT1: Primary battery voltage
MB3790
STANDARD DEVICE CONFIGURATION
BAT1
CONTROL
BAT2
ALARM1 ALARM1 ALARM2 Secondary battery ALARM2 Primary battery RESET RESET
capacitors 0.022 more. VOUT, connect these pins mating pins, respectively.
ORDERING INFORMATION
Part number MB3790PF MB3790PFT Package pin, Plastic (FPT-16P-M06) pin, Plastic SSOP (FPT-20P-M04) Remarks
MB3790
PACKAGE DIMENSIONS
16-pin, Plastic (FPT-16P-M06)
2.25(.089)MAX 10.15 -0.20 .400 -.008
+0.25 +.010
0.05(.002)MIN (STAND OFF)
INDEX
5.30±0.30 (.209±.012)
7.80±0.40 (.307±.016)
6.80 -0.20 +.016 .268 -.008
+0.40
1.27(.050)
0.45±0.10 (.018±.004)
0.15 -0.02 +.002 .006 -.001 Details part 0.40(.016)
+0.05
0.50±0.20 (.020±.008)
Details part 0.15(.006) 0.20(.008)
0.10(.004) 8.89(.350)REF
0.20(.008) 0.18(.007)MAX 0.68(.027)MAX 0.18(.007)MAX 0.68(.027)MAX
1994 FUJITSU LIMITED F16015S-2C-4
Dimensions (inches)
(Continued)
MB3790
(Continued)
20-pin, Plastic SSOP (CASE No.: FPT-20P-M04)
6.50±0.10
(.256±.004)
1.10±0.10 (.043±.004) 0.10(.004)
INDEX
4.40±0.10
6.40±0.20 (.173±.004) (.252±.008)
5.40(.213)NOM
0.65±0.12 (.0256±.0047) 0.22 .009
+0.10 -0.05 +.004 -.002
0.15 -0.02 +.002 .006 -.001
+0.05
Details part 0.10±0.10 (STAND OFF) (.004±.004)
5.85(.230)REF 0°~10°
0.50±0.20 (.020±.008)
1994 FUJITSU LIMITED F20014S-1C-4
Dimensions (inches)
Since SSOP (FPT-20P-M04) built extremely thin structure, partial heating method when mounting device.
FUJITSU LIMITED
further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-88, Japan Tel: (044) 754-3763 Fax: (044) 754-3329 North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, U.S.A. Tel: (408) 922-9000 Fax: (408) 432-9044/9045 Europe FUJITSU MIKROELEKTRONIK GmbH Siebenstein 6-10 63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122 Asia Pacific FUJITSU MICROELECTRONICS ASIA PTE. LIMITED #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
Rights Reserved. contents this document subject change without notice. Customers advised consult with FUJITSU sales representatives before ordering. information circuit diagrams this document presented examples semiconductor device applications, intended incorporated devices actual use. Also, FUJITSU unable assume responsibility infringement patent rights other rights third parties arising from this information circuit diagrams. FUJITSU semiconductor devices intended standard applications (computers, office automation other office equipment, industrial, communications, measurement equipment, personal household devices, etc.). CAUTION: Customers considering products special applications where failure abnormal operation directly affect human lives cause physical injury property damage, where extremely high levels reliability demanded (such aerospace systems, atomic energy controls, floor repeaters, vehicle operating controls, medical devices life support, etc.) requested consult with FUJITSU sales representatives before such use. company will responsible damages arising from such without prior approval. semiconductor devices have inherently certain rate failure. must protect against injury, damage loss from such failures incorporating safety design measures into your facility equipment such redundancy, fire protection, prevention over-current levels other abnormal operating conditions. products described this document represent goods technologies subject certain restrictions export under Foreign Exchange Foreign Trade Control Japan, prior authorization Japanese government should required export those products from Japan.
F9703 FUJITSU LIMITED Printed Japan
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