Negative Voltage Swap Controller 34653 highly integrated swap con

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Negative Voltage Swap Controller 34653 highly integrated swap con

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Document Number: MC34653 Rev. 8.0, 2/2007
Negative Voltage Swap Controller
34653 highly integrated swap controller with internal Power MOSFET. provides means safely install remove boards from live backplanes without having power down entire system. regulates inrush current, from supply load's filter capacitor, user-programmable limit, allowing system safely stabilize. disable function allows user disable 34653 manually through microprocessor safely disconnect load from main power line. 34653 active high active power good output signals that used directly enable power module load. Undervoltage overvoltage detection circuitry monitors input voltage check that within operating range. start-up delay timer ensures that safe turn Power MOSFET charge load capacitor. two-level current limit approach controlling inrush current switching load limits peak power dissipation Power MOSFET. Both current limits user programmable. Features Integrated Power MOSFET Control Small Outline Package Input Voltage Operation Range from Programmable Overcurrent Limit with Auto Retry Programmable Charging Current Limit Independent Load Capacitor Start-Up Retry Delay Timer Overvoltage Undervoltage Detection Active High Power Good Output Signals Thermal Shutdown Pb-Free Packaging Designated Suffix Code
34653
SWAP
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SUFFIX (Pb-Free) 98ASB42564B 8-PIN SOICN
ORDERING INFORMATION
Device MCZ34653EF/ MC34653EF/ Temperature Range (TA) 40°C 85°C Package SOICN
34653
DISABLE System Power Supply (Backplane) VPWR VOUT Load Application Dependent
Optional External Components
ILIM
ICHG
Optional External Components
Figure 34653 Simplified Application Diagram
This document contains certain information product. Specifications information herein subject change without notice.
Freescale Semiconductor, Inc., 2007. rights reserved.
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INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
DISABLE
Referenced VPWR Logic
Fixed Oscillator
VPWR
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UVLO
Logic
Thermal Shutdown ILIM External Resistors Detection Programmable Current Limit Gate Control Driver Sensor MOSFET
ICHG
Power MOSFET
VOUT
Figure 34653 Simplified Internal Block Diagram
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CONNECTIONS
CONNECTIONS
VOUT
ICHG ILIM DISABLE VPWR
Figure 8-SOICN Connections Table 8-SOICN Definitions functional description each found FUNCTIONAL DESCRIPTION section beginning page
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Name
Formal Name Power Good Output (Active High) Power Good Output (Active Low) Voltage Output Negative Supply Voltage Input Positive Supply Voltage Input Disable Input Control
Definition This active high power good output signal. This referenced VIN. This active power good output signal. This referenced VIN. This drain internal Power MOSFET supplies current limited voltage load. This most negative power supply input. pins except DISABLE referenced this input. This most-positive power supply input. load connects between this VOUT pin. This used easily disconnect connect load from main power line disabling enabling 34653. also used reset fault conditions that cause "Power Good" signal. This referenced VPWR. This used overcurrent limit during normal operation. This used load's input capacitor charging current limit, hence limiting inrush current known constant value.
VOUT VPWR DISABLE
ILIM ICHG
Current Limit Control Charging Current Limit Control
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ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table Maximum Ratings voltages with respect ground unless otherwise noted. Exceeding these ratings cause malfunction permanent damage device.
Ratings ELECTRICAL RATINGS Power Supply Voltage Power MOSFET Energy Capability VPWR EMOSFET (CONT)
Symbol
Value
Unit
Varies
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Maximum Voltage DISABLE ILIM ICHG Pins (VPG VIN)
(VPG VIN)
VPWR Internally Limited 2000
Pins Minimum Voltage Maximum Current Voltage, Pins
Human Body Model Machine Model THERMAL RATINGS Storage Temperature Operating Temperature Ambient Junction Peak Package Reflow Temperature During Reflow Thermal Resistance Junction-to-Ambient, Single-Layer Board
(5),
VESD3 VESD4
TSTG TPPRT RJMA
Note
°C/W
Junction-to-Ambient, Four-Layer Board (10)
Notes Refer section titled Power MOSFET Energy Capability page detailed explanation this parameter. Continuous output current capability long 160°C. ESD1 testing performed accordance with Human Body Model (CZAP RZAP 1500 ESD2 testing performed accordance with Machine Model (CZAP RZAP limiting factor junction temperature, taking into account power dissipation, thermal resistance, heatsinking. soldering temperature limit seconds maximum duration. designed immersion soldering. Exceeding these limits cause malfunction permanent damage device. Freescale's Package Reflow capability meets Pb-free requirements JEDEC standard J-STD-020C. Peak Package Reflow Temperature Moisture Sensitivity Levels (MSL), www.freescale.com, search part number [e.g. remove prefixes/suffixes enter core view orderable parts. (i.e. MC33xxxD enter 33xxx), review parametrics. Refer section titled Thermal Shutdown page more thermal resistance values under various conditions. VOUT pins comprise main heat conduction paths. SEMI G38-87 JEDEC JESD51-2 with single-layer board (JESD51-3) horizontal. JEDEC JESD51-6 with board (JESD51-7) horizontal. There thermal vias connecting package planes board.
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Continuous Output Current
ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table Static Electrical Characteristics Characteristics noted under conditions VPWR 40°C 85°C. voltages referenced unless otherwise noted.
Characteristic POWER SUPPLY (VPWR) Supply Voltage Operating Voltage Range Supply Current, Device Enabled, Default Mode, Normal Operation (11) Undervoltage Lockout Threshold (UVLO) Rising VUVLOR VUVLOF VUVLOHY VPWR VPWR (ON) (ON) 1400 Symbol Unit
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Falling Hysteresis UNDERVOLTAGE CONTROL Threshold (Default) Rising Falling Hysteresis OVERVOLTAGE CONTROL Threshold (Default) Rising Falling Hysteresis DISABLE INPUT CONTROL (DISABLE) DISABLE Input Voltage Inactive State Active State, Positive Signal Active State, Negative Signal DISABLE Input Current VDIS VPWR VDIS VPWR VDIS
(12)
VUV(ON) VUV(OFF) VUVHY
(OFF) (ON) VOVHY
VDISL VDISHP VDISHN IDIS -150 -140 VPWR VPWR VPWR VPWR
Notes supply current depends operation mode calculated follows: Mode: ICHG(A) ILIM(A) VPWR(V) 460(k) Mode: ILIM(A) ILOAD(A) VPWR(V) 460(k) Mode: ILIM(A) VPWR(V) 460(k) Mode: ILIM(A) IDIS(A) VPWR(V) 460(k) Referenced VPWR.
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ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS
Table Static Electrical Characteristics (continued) Characteristics noted under conditions VPWR 40°C 85°C. voltages referenced unless otherwise noted.
Characteristic CURRENT LIMIT PINS (ILIM, ICHG) Overcurrent Limit Steady State Default Maximum with External Resistor Minimum with External Resistor Current Limit During Start-Up Default Maximum with External Resistor Minimum with External Resistor ICHG ISHORT ILIMHY ILIMCLA ICHGCLA VILIM 0.05 ILIM 1.25 0.15 Symbol Unit
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Short Circuit Current Limit ILIM Current Limit Hysteresis ILIM Current Limit Accuracy ICHG Current Limit Accuracy ILIM Voltage ILIM RILIM Setting Constant ICHG Reference Current ICHG RICHG Setting Constant POWER GOOD PINS (PG,
(13)
ILIMCNS
ICHGOUT ICHGCNS
Power Good Output Voltage Power Good Leakage Current Power Good Current Limit OUTPUT VOLTAGE (VOUT) VOUT Leakage Current POWER MOSFET Resistance 25°C THERMAL SHUTDOWN Thermal Shutdown Temperature Thermal Shutdown Temperature Hysteresis Notes Referenced VIN.
VPGL IPGLG IPGCL
IOUTLG
RDS(ON)
TSDHY
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ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table Dynamic Electrical Characteristics Characteristics noted under conditions VPWR 40°C 85°C. voltages referenced unless otherwise noted.
Characteristic UNDERVOLTAGE CONTROL Undervoltage Active Gate Filter Time OVERVOLTAGE CONTROL Overvoltage Active Gate Filter Time DISABLE INPUT CONTROL (DISABLE) (14) OVAL UVAL Symbol Unit
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CURRENT LIMIT CONTROL PINS (ILIM, ICHG) Short Circuit Protection Delay Overcurrent Limit Filter Time Overcurrent Limit Regulation Time ICHG Rise Time Default Adjustable with External Capacitor POWER GOOD OUTPUT PINS (PG,
(15)
SCPD OCFT ICHGR
Power Good Output Delay Time, from Power MOSFET Enhancement Asserted FAULT TIMER Start-Up Retry Delay Timer Default Notes Referenced VPWR. Referenced VIN.
TIMER
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DISABLE Active Gate Filter Time
DISAL
FUNCTIONAL DESCRIPTION INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
Most telecom data transfer networks require that circuit boards inserted removed from system without powering down entire system. When circuit board inserted into removed from live backplane, filter bypass capacitors input board's power module switching power supply cause large transient currents when being charged discharged. These currents cause severe permanent damage boards, thus making system unstable. Figure displays inrush current filter capacitor swap device absent. inrush current reached unsafe value more than voltages controlled manner regulating inrush current user-programmable limit, thus allowing system safely stabilize (see Figure 34653 provides protection against overcurrent, undervoltage, overvoltage, overtemperature. Furthermore, protects system from short circuits.
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Figure Circuit Board Insertion With Swap Device, Inrush Current Limited integrating control circuitry Power MOSFET switch into space-efficient package, 34653 offers complete, cost-effective, simple solution that takes much less board space than similar part with external Power MOSFET requires. 34653 used telecom networking systems, servers, electronic circuit breakers, distributed power systems, negative power supply control, central office switching.
Figure Circuit Board Insertion Without Swap Device, Inrush Current Limited 34653 integrated negative voltage swap controller with internal Power MOSFET. 34653 resides plug-in boards allows boards safely inserted removed powering supply
FUNCTIONAL DESCRIPTION NEGATIVE SUPPLY INPUT VOLTAGE (VIN)
This most negative power supply input. pins except DISABLE, referenced this input. signal deactivated under following conditions: Power turned off. device disabled more than device exceeded thermal shutdown threshold more than device overvoltage undervoltage mode more than Load current exceeded overcurrent limit more than This referenced VIN.
POWER GOOD OUTPUT (ACTIVE HIGH) (PG)
active high power good output signal that used enable disable load. This signal goes active after successful power-up sequence stays active long device normal operation experiencing faults.
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FUNCTIONAL DESCRIPTION FUNCTIONAL DESCRIPTION
POWER GOOD OUTPUT (ACTIVE LOW)
active power good output signal that used enable disable load. This signal goes active after successful power-up sequence stays active long device normal operation experiencing faults. signal deactivated under following conditions: Power turned off. device disabled more than device exceeded thermal shutdown threshold more than device overvoltage undervoltage mode more than Load current exceeded overcurrent limit more than
DISABLE INPUT CONTROL (DISABLE)
DISABLE used easily disconnect connect load from main power line disabling enabling 34653. also used reset fault conditions that cause "Power Good" signal. left open connected VPWR, DISABLE inactive device enabled. positive voltage (above VPWR) negative voltage (below VPWR) applied DISABLE, active device disabled. disable function filter timer. This referenced VPWR.
CURRENT LIMIT CONTROL (ILIM)
ILIM used overcurrent limit during normal operation. This left unconnected default overcurrent limit value user connect external resistor between ILIM pins overcurrent limit value. This value vary between 0.15 1.25 overcurrent detection circuit filter timer.
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This referenced VIN.
OUTPUT VOLTAGE (VOUT)
VOUT drain internal Power MOSFET supplies current-limited voltage load. load connects between VOUT VPWR pins.
CHARGING CURRENT LIMIT CONTROL (ICHG)
ICHG used current limit that used charge load's input capacitor, hence limiting inrush current known constant value. This left unconnected default charging current limit value default ICHG rise time user connect external resistor between ICHG pins current limit value between 0.05 external capacitor increase ICHG rise time. recommended maximum rise time
POSITIVE SUPPLY VOLTAGE INPUT (VPWR)
VPWR most-positive power supply input. load connects between VPWR VOUT pins.
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FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES START-UP SEQUENCE
When power first applied 34653 connecting negative voltage rail VPWR positive voltage rail, 34653 keeps Power MOSFET turned off, deactivates power good output signals, resets retry counter. device disabled, further activities will occur power-up would start. device enabled, starts establish internally regulated supply voltage required internal circuitry. Power MOSFET will stay until start charging process. After Power-ON Reset (POR) once Undervoltage Lockout (UVLO) threshold cleared, 34653 checks external components pins ILIM ICHG levels Overcurrent Limit Charging Current Limit, respectively. device then initiates start-up timer (Point Figure checks start-up conditions (see next paragraph). duration timer default value. undervoltage overvoltage faults during power 34652 retries infinitely until normal input voltage attained. temperature ever increased beyond thermal shutdown threshold device disabled, then start-up timer resets retry counter increments. after retries temperature still high device still disabled, 34652 will retry again power device must recycled device must disabled reset retry counter. Start-Up Conditions start-up conditions follows: Input voltage below overvoltage turn-off threshold. This threshold default. Input voltage above undervoltage turn-off threshold. This threshold default. temperature less than thermal shutdown temperature. Device enabled. start-up conditions satisfied time equal length start-up timer retry counter less than equal device starts turn Power MOSFET gradually control inrush current that charges load capacitor eventually switch load (Point Figure Charging Process When charging capacitor from fixed voltage source, definite amount energy will dissipated control circuit, matter what control algorithm This energy equal energy transferred capacitor With this mind, Power MOSFET 34653 cannot absorb this pulse energy instantaneously, pulse must dissipated over time. limit peak power dissipation Power MOSFET spread duration energy dissipation Power MOSFET, circuit uses two-level current approach controlling inrush current switching load explained following paragraphs. When Power MOSFET turned current limit gradually from ICHG (between Points Figure charging current value gradual rise time ICHG either defaults they user programmable (2.0 rise time example Figure charging current value ICHG intended limit temperature increase during load capacitor charging process, gradual rise ICHG prevent transient dips input voltage sharp increases current. This prevents input voltage from drooping current steps acting input line inductance, that turn prevents premature activation detection circuit.
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Figure Start-Up Sequence
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FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES
NORMAL MODE
start-up conditions (list page violated time from start Power MOSFET enhancement process thereafter during normal operation, Power MOSFET turns power good output signals deactivate, disabling load, timer cycle starts explained previously. 34653 also monitors load current prevent overload short circuit conditions from happening protect load from damage.
LOAD CURRENT CONTROL
When normal operation mode, 34653 monitors load provides modes current control explained paragraphs below.
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Figure Power MOSFET Turn-On Gradual Increase Charging Current from ICHG (2.0 Example) ICHG current charges load capacitor relatively slowly. When load capacitor fully charged, Power MOSFET reaches full enhancement, which triggers current limit detection change from ICHG ILIM load current decrease (Point Figure page 10). current spike Point Figure better displayed Figure that when VOUT Power MOSFET fully turns reach full enhancement, charging capacitor additional with higher current value that quickly ramps down. This eliminates need current slew rate control because hazard voltage change less than power good output signals activate after delay (Point Figure which turn enables load. 34653 normal operation mode retry counter resets.
34653 monitors load overcurrent conditions. current going through load becomes larger than overcurrent limit longer than overcurrent limit filter timer overcurrent signal asserted gate Power MOSFET discharged regulate current ILIM value (Point Figure 34653 overcurrent mode after filter timer device still overcurrent mode, device turns Power MOSFET deactivates power good output signals (Point Figure 34653 then initiates another start-up timer goes back through enhancement process. during timer fault cleared, then 34653 goes back normal operation mode power good output signals stay activated shown Figure This device overcomes temporary overcurrent situations same time protects load from more severe overcurrent situation. Short Circuit Mode current going through load becomes Power MOSFET discharged very fast less than regulate current ILIM value, 34653 overcurrent mode Then follows pattern outlined Overcurrent Mode paragraph above.
Figure Full Power MOSFET Turn-On Current Spike Associated with Charging Process
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Overcurrent Mode
FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES
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Figure Overcurrent Mode More Than
Figure Disabling Enabling 34653 Figure demonstrates that 34653 must enabled length start-up timer start turning Power MOSFET. After fourth disable signal, 34653 enabled length start-up timer. because retry counter less than 34653 turns Power MOSFET starts charging process (refer Charging Process, pages 10-11).
Figure Overcurrent Mode Less Than
DISABLING ENABLING 34653
When negative voltage below VPWR) applied DISABLE more than (Point Figure 11), 34653 disabled, Power MOSFET turns off, power good output signals deactivate. 34653 stays this state until voltage DISABLE brought within VPWR more than enable device (Point Figure 11). Then start-up sequence initiates described page Applying positive voltage above VPWR) would also disable 34653 same manner. Figure Start-Up Timer Versus Disable
BOARD REMOVAL
When board removed, power ramps down. soon 34653's input voltage reaches undervoltage turn-off threshold, undervoltage detection circuit activates Power MOSFET turns having violated start-up conditions (list page 10).
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FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES
STATE MACHINE
Figure representation 34653 behavior different modes operation.
Temp 160°C Filter
Thermal Shutdown 160°C DISABLE N=N+1 VPWR VOV(OFF) VPWR VOV(OFF) VPWR VUV(OFF) VPWR VOV(ON) Filter TIMER Filter Filter Overvoltage MOSFET
Thermal Shutdown MOSFET
Temp 135°C Filter
Start-Up Conditions
Charging Mode
Turn MOSFET
Fail Check Retry Fault STOP Toggle DISABLE cycle Power then clear fault
Power Good Check ILOAD ILIM Overcurrent
Pass Check
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VPWR VUV(OFF) Filter
VPWR VUV(ON) Filter
Ext. Resistor Check signal "set" generated check resistors ILIM, ICHG, TIMER pins later VPWR VUVLOR Filter Power MOSFET generated DISABLE Filter DISABLE MOSFET generated
Undervoltage MOSFET
Normal Operation Overcurrent Mode Filter ILOAD ILIM ILIMHY ILOAD ISHORT Short Circuit Detection Fast Gate Discharge
VPWR VUVLOF Filter
DISABLE Filter
Figure State Diagram
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ILOAD ILIM
FUNCTIONAL DEVICE OPERATION PROTECTION DIAGNOSIS FEATURES
PROTECTION DIAGNOSIS FEATURES UNDERVOLTAGE
When input voltage drops below undervoltage falling threshold more than undervoltage fault detected start-up conditions (list page violated. 34653 turns Power MOSFET deactivates power good output signals, disabling load (Point Figure 14). 34653 stays this state until input voltage rises above undervoltage rising threshold more than signaling that supply voltage normal operation range (Point Figure 14). Then start-up sequence initiates described page undervoltage detection circuit also equipped with hysteresis.
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Figure Start-Up Timer Protection Against Undervoltage Faults
OVERVOLTAGE
When input voltage exceeds overvoltage rising threshold more than overvoltage fault detected start-up conditions (list page violated. 34653 turns Power MOSFET deactivates power good output signals, disabling load. 34653 stays this state until input voltage falls below overvoltage falling threshold more than signaling that supply voltage normal operation range. Then start-up sequence initiates described page overvoltage detection circuit also equipped with hysteresis. waveforms overvoltage fault shown Figure
Figure Undervoltage Fault Followed Start-Up Sequence shows 34653 uses start-up timer Figure make sure that input voltage above undervoltage falling threshold. 34653 normal operation before Point Point undervoltage fault occurs. Then fault cleared Point 34653 initiates start-up sequence. Before start-up timer another undervoltage fault occurs Point 34653 does turn Power MOSFET. Point fault cleared again length start-up timer 34653 turns Power MOSFET starts charging process (refer Charging Process, pages 10-11).
Figure Overvoltage Fault
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FUNCTIONAL DEVICE OPERATION PROTECTION DIAGNOSIS FEATURES
THERMAL SHUTDOWN
thermal shutdown feature helps protect internal Power MOSFET circuitry from excessive temperatures. During start-up thereafter during normal operation, 34653 monitors temperature internal circuitry excessive heat. temperature device exceeds thermal shutdown temperature 160°C, start-up conditions (list page violated, device turns Power MOSFET deactivates power good output signals. Until temperature device goes below 135°C, start-up sequence will initiated. This feature advantage over solutions with external Power MOSFET, because easy device with external MOSFET sense temperature quickly accurately. thermal shutdown circuit equipped with filter. Thermal design critical proper operation 34653. typical RDS(ON) internal Power MOSFET 0.144 room ambient temperature reach 0.251 high temperatures. thermal performance 34653 vary depending many factors, among them: ambient operating temperature (TA). type board whether single layer multilayer, heat sinks not, etc. which affects value junction-to-ambient thermal resistance (RJA). value desired load current (ILOAD). When choosing overcurrent limit, certain guidelines need followed make sure that load current running close overcurrent limit 34653 does into thermal shutdown. good practice parameters that resulting maximum junction temperature below thermal shutdown temperature safe margin. Equation used calculate maximum allowable overcurrent limit based maximum desired junction temperature vice versa. power dissipation device calculated follows: I2(LOAD) RDS(ON) TJ(max) TA(max)] Combining equations: I2(LOAD) TJ(max) TA(max)] [RJA RDS(ON) example: TA(max) 55°C °C/W four-layer board RDS(ON) 0.251 high temperatures
Then: I2(LOAD) TJ(max) [111 °C/W 0.251 I2(LOAD) TJ(max) 27.86 overcurrent limit then maximum junction temperature 82.86 which well below thermal shutdown temperature that allowed. previous explanation applies steady state power when device normal operation. During charging process, power dominated across Power MOSFET. When charging starts, power Power MOSFET rises reaches maximum value then quickly ramps back down steady state level period governed size load's input capacitor that being charged value charging current limit ICHG. this case instantaneous power dissipation much higher than steady state case, very short time. example: ICHG default value CLOAD very large capacitor VPWR worst case Then: power pulse magnitude ICHG VPWR power pulse duration CLOAD VPWR ICHG Figure displays temperature profile device under instantaneous power pulse during charging process. Table depicts thermal resistance values different board configurations.
70.0
Temperature Rise (°C) TemperatureRise (°C) Temperature Rise Temperature Rise
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60.0 50.0 40.0 30.0 20.0 10.0 0.000 0.050 0.100 0.150 0.200 0.250 0.300 0.350
Time (sec) Time (sec)
Figure Instantaneous Temperature Rise Power Pulse that Decreases Linearly Period
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FUNCTIONAL DEVICE OPERATION PROTECTION DIAGNOSIS FEATURES
Table Thermal Resistance Data
Type Junction Ambient Junction Ambient Junction Ambient Junction Ambient Junction Ambient Junction Ambient Junction Ambient Junction Board Junction Case Junction Package Condition Single-layer board (1s), JEDEC jesd51-2 with board (JESD51-3) horizontal Four-layer board (2s2p), JEDEC JESD51-2 with board (JESD51-3) horizontal Single-layer board with radiator surface, standard JEDEC Single-layer board with radiator surface, standard JEDEC Four-layer board with each thermal lead, standard JEDEC Four-layer board with radiator surface full array vias between radiator surface, standard JEDEC Four-layer board with radiator surface full array vias between radiator surface, standard JEDEC Thermal resistance between board JEDEC JESD51-8 Thermal resistance between case Temperature difference between package junction JEDEC JESD51-2 Symbol RJMA Value Unit
°C/W °C/W °C/W °C/W °C/W °C/W °C/W °C/W °C/W °C/W
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TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
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Figure Typical Application Diagram with External Components Necessary Program Device
PLUG-IN CARD
UNDERVOLTAGE OVERVOLTAGE DETECTION
Application Dependent Enable/Enable CLOAD DC/DC Converter
33653
VPWR
Live Backplane
ICHG
VOUT ILIM
Figure Typical Application Diagram with Default Settings Minimal External Components 34653 also programmed different values Overcurrent Limit Charging Current Limit using external components connected device. Figure shows 34653 with required external components that allow access programmable features device.
34653 monitors input voltage ensure that within operating range that there overvoltage undervoltage conditions, quickly turn Power MOSFET there are. Internal comparators connected internal resistor divider between VPWR input pins compare supply voltages with reference voltage. typical default values turn-off threshold (falling threshold) turn-off threshold (rising threshold) will give typical operating range This range suitable telecom industry standards. When device passes UVLO threshold, uses UV/OV detection circuits check input supply levels before turning Power MOSFET during start-up Timer delay thereafter. long voltage above undervoltage falling threshold below overvoltage rising threshold, supply within operating range Power MOSFET allowed turn stay input voltage falls below undervoltage falling threshold rises above overvoltage rising threshold, then startup conditions (list page violated Power MOSFET turns off, power good signal deactivates, start-up timer initiates. undervoltage overvoltage detection circuits equipped with filter filter momentary input supply dips.
TIMER
Timer function 34653 provides time base used generate timing sequences start-up. same timer controls retry delay when device experiences fault. Timer function default timer value
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34653 resides plug-in board (see Figures 19), allowing board safely inserted removed without damaging electrical equipment. 34653 operated with external components other than power good output signal pull-up resistor default mode selected programmable features. This great advantages 34653: operates with minimal user interface minimal external component count still offers complete swapping functionality with necessary protection features, from undervoltage/ overvoltage detection, current limiting, short circuit protection power good output signaling. default values were chosen sufficient many standard applications. Figure typical application diagram depicting default mode using power good output signal pullup resistor. Refer static dynamic electrical characteristics tables pages through various default values.
PLUG-IN CARD
33653
VPWR
VOUT Application Dependent Enable/Enable CLOAD DC/DC Converter
Live Backplane
DISABLE
ICHG
ILIM RILIM
CICHG
RICHG
TYPICAL APPLICATIONS
During start-up fault occurred, this timer value used when initiating start-up sequence.
POWER GOOD OUTPUT SIGNALS
power good pins output pins that used directly enable power module load. device active high active power good output signals. Choosing which power good active signal depends Enable signal requirement load. This feature allows 34653 adapt different applications wide variety loads. power good output signal active Power MOSFET fully enhanced device normal operation. signal goes active after typical delay. signal deactivates following occurs:
DISABLE referenced VPWR left open connected VPWR, meaning voltage DISABLE between VPWR VPWR inactive device enabled. positive voltage (1.8 above VPWR) negative voltage (1.8 below VPWR) applied DISABLE, active device disabled.
CHARGING CURRENT LIMIT
When device passes UVLO threshold, checks there external resistor external capacitor connected ICHG pin. there then determines value charging current limit value charging current limit rise time accordingly. there not, uses default charging current limit value rise time Note Users allowed connect external capacitor ICHG only external resistor also connected. During external components' check, capacitor produces impulse current external resistor will detected, even external resistor absent. When Power MOSFET turned current limit gradually from ICHG. This current charges load capacitor relatively slowly. When load capacitor fully charged, Power MOSFET reaches full enhancement, which triggers current limit change from ICHG ILIM load current decrease. power good output signals activate after delay, which turn enables load. 34653 normal operation mode retry counter resets. charging current value ICHG intended limit temperature increase during load capacitor charging process, gradual rise ICHG prevent transient dips input voltage sharp increases limit current. This prevents input voltage from drooping current steps acting input line inductance, that turn prevents premature activation detection circuit. Choosing External Resistor RICHG Value user change value charging current limit adding resistor (RICHG) between ICHG pins, shown Figure page charging current value ranges between with default value Table lists examples RICHG different values ICHG Figure shows plot RICHG versus ICHG recommended that closest standard resistor value actual value chosen. Note Accuracy requirements application dependent. calculate value RICHG resistor following equations: ICHG RICHG RICHG ICHG
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When power good output signal becomes inactive, disables load, protecting from faults damage. These loads usually converters, depicted Figure page also connected indicate that power good. pins referenced require pullup resistor connected VPWR (Figures page 17).
DISABLING ENABLING 34653
Disable control input (DISABLE) provides functions: External enable /disable control. Manual resetting device retry counter after fault occurred. Using DISABLE pin, user enable /disable 34653 device, which facilitates easy access connect load disconnect from main power rail. When power first applied, DISABLE must inactive order 34653 initiate start-up sequence. DISABLE active, device makes further steps until inactive. point during start-up thereafter during normal operation, DISABLE activated, then retry counter resets, Power MOSFET turns power good output signals deactivate. DISABLE circuit equipped with filter filter glitches transients DISABLE input prevent Power MOSFET from turning prematurely.
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Power turned off. device disabled more than device exceeded thermal shutdown threshold more than device overvoltage undervoltage mode more than Load current exceeded overcurrent limit more than
TYPICAL APPLICATIONS
Table RICHG Values Some Desired ICHG Values
ICHG 0.05 0.15 0.25 0.35 0.45 RICHG 15.35 32.10 48.85 65.60 82.35 99.10 115.85 135.60 149.35 166.10
Choosing External Capacitor CICHG Value user also change charging current rise time adding capacitor (CICHG) between ICHG pins, shown Figure page charging current rise time ranges between (default value) recommended maximum Table lists examples CICHG different values ICHGR Figure shows plot CICHG versus ICHGR. calculate value CICHG capacitor following equation: CICHG(nF) 1000 ICHGR(ms) RICHG(k) Table CICHG Values Some Desired ICHGR Values Specific ICHG Value
ICHGR (ms)
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21.72 43.43 65.15 86.86 108.58 130.29 152.01 173.72 195.44 217.16
10.38 20.77 31.15 41.54 51.92 62.31 72.69 83.07 93.46 103.84
2.01 4.01 6.02 8.03 10.03 12.04 14.05 16.05 18.06 20.07
RICHG RICHG (kohm)
ICHG
Figure External Resistor (RICHG Value Versus Charging Current Limit Value (ICHG)
ICHG (nF) CICHG (nF)
ICHG 0.05 ICHG
ICHG ICHG
ICHG ICHG
ICHGR TICHGR(ms)
Figure Charging Current External Capacitor (CICHG) Versus Charging Current Rise Time ICHGR
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CICHG (nF) ICHG 0.05
CICHG (nF) ICHG
CICHG (nF) ICHG
TYPICAL APPLICATIONS
OVERCURRENT LIMIT
When normal operation mode, 34653 monitors load compares (with hysteresis) current going through Sensor MOSFET with reference current value generated reference current limit value ILIM. current going through Sensor MOSFET becomes larger than reference current more than overcurrent signal asserted, gate Power MOSFET discharged fast less than regulate current, 34653 overcurrent mode after filter time device still overcurrent mode, device turns Power MOSFET deactivates power good output signals. 34653 then initiates another start-up timer goes back through enhancement process. during timer fault cleared where load current less than ILIM minus hysteresis value, which ILIM value, then 34653 goes back normal operation mode power good output signals stay activated. This device overcomes temporary overcurrent situations same time protects load from more severe overcurrent situations. When device passes UVLO threshold, checks there external resistor connected ILIM pin. there determines value overcurrent limit. there not, uses default overcurrent limit value then uses Sensor MOSFET monitor load overcurrent conditions during operation explained previous paragraph. Choosing External Resistor RILIM Value user change current limit adding resistor (RILIM) between ILIM pins, shown Figure page This 34653 device adaptable different requirements operating environments. overcurrent value ranges between 0.15 1.25 with default value Table lists examples RILIM different values ILIM Figure shows plot RILIM versus ILIM recommended that closest standard resistor value actual value chosen. Note Accuracy requirements application dependent. calculate value RILIM resistor following equations: ILIM RILIM RILIM ILIM (A)]
Table RILIM Values Some Desired ILIM Values
ILIM 0.15 1.25 RILIM 859.71 644.43 429.15 321.52 256.93 213.88 183.12 160.06 142.12 127.77 116.02 106.24 101.93
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ILIM ILIM
Figure External Resistor (RILIM) Value Versus Current Limit Value (ILIM)
SHORT CIRCUIT DETECTION
current going through load becomes Power MOSFET discharged very fast less than regulate current, 34653 overcurrent mode Then follows pattern outlined Overcurrent Limit paragraph above.
34653
Analog Integrated Circuit Device Data Freescale Semiconductor
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RILIM RILIM (kohm))
TYPICAL APPLICATIONS
POWER MOSFET ENERGY CAPABILITY
Figure shows projected energy capability device's internal Power MOSFET under drain-to-source voltage ambient temperature 90°C. compared energy levels required capacitive loads discharge periods respectively. clear that Power MOSFET well exceeds required energy capability three cases with sufficient margin. example, capacitor load with discharge time requires energy capability about 1540 which well below Power MOSFET capability about 3500 result this analysis 33652 expected exceedingly meet energy capability requirements possible capacitive loads.
3500 3000 2500
Energy (mJ)
Estimated Area =1.7
2000 1500 1000 Time (ms)
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Figure Projected Energy Capability Power MOSFET Compared Required Energy Levels Some Capacitive Loads
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Analog Integrated Circuit Device Data Freescale Semiconductor
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PACKAGING
PACKAGING
PACKAGE DIMENSIONS
Important most current revision package, visit www.freescale.com perform keyword search "98A" drawing number below.
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SUFFIX (Pb-Free) 8-PIN SOIC NARROW BODY PLASTIC PACKAGE 98ASB42564B ISSUE
34653
Analog Integrated Circuit Device Data Freescale Semiconductor
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REVISION HISTORY
REVISION HISTORY
REVISION
DATE 2/2006 8/2006
DESCRIPTION CHANGES Changed Document Order Corrected CONNECTIONS page Updated document prevailing Freescale form style Updated PACKAGE DIMENSIONS page Added Part Number MCZ34653EF/R2 Ordering Information Added RoHS logo Removed Peak Package Reflow Temperature During Reflow (solder reflow) parameter from MAXIMUM RATINGS page Added note Freescale's Package Reflow capability meets Pb-free requirements JEDEC standard J-STD-020C. Peak Package Reflow Temperature Moisture Sensitivity Levels (MSL), www.freescale.com, search part number [e.g. remove prefixes/suffixes enter core view orderable parts. (i.e. MC33xxxD enter 33xxx), review parametrics. page
2/2007
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34653
Analog Integrated Circuit Device Data Freescale Semiconductor
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Reach
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MC34653 Rev. 2/2007
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Negative Voltage Swap Controller 34653 highly integrated swap con

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