BQ76PL102RGT - Texas Instruments High-Performance Analog

FEATURES

DESCRIPTION

APPLICATIONS

RELATED DEVICES

bq76PL102

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........................................................................................................................................................................................... SLUS887 – DECEMBER 2008

PowerLAN™ Dual-Cell Li-Ion Battery Monitor with PowerPump™ Cell Balancing

•Monitors One or Two Individual Cell Voltages,One Internal, and Two External Temperatures

The bq76PL102 PowerLAN dual-cell battery monitoris part of a complete scalable battery management•Part of a Complete Low-Cost Solution for

system for use with arrays of up to 12 Li-IonBattery Packs of up to 12 Series and One or

rechargeable cells. The bq76PL102 connects to oneMore Parallel Cells (When Used With

or two cells in a series string, performs voltage andbq78PL114).

temperature monitoring of each individual cell, and•Advanced PowerPump™ Balancing

reports these parameters over the PowerLANTechnology Equalizes Cells in Li-Ion Battery

communication network. Together with a bq78PL114Packs, Resulting in Longer Run Time and Cell

master-gateway battery controller, the bq76PL102Life.

forms a complete battery monitoring andmanagement system for higher cell-count•PowerPump™ Cell Balancing Transfers

applications.Charge From Cell to Cell During all OperatingConditions – No Wasteful Current Bleeding or

Partitioning of the battery monitor function on a perAssociated Heat Buildup.

cell basis permits connection and measurement closeto the cell. This results in superior accuracy and•Unique PowerLAN™ Isolated Communications

management over competing solutions. This schemeTechnology Permits Simultaneous

also facilitates the PowerPump cell balancing system,Measurement of All Individual Cell Voltages in

a technique which actively balances capacities ofa Series String.

Li-Ion batteries without the excessive heat or•Very Low Power Consumption:

limitations of bleed-balancing techniques.– < 200 µA Active

The bq76PL102 PowerPump cell balancing– < 50 µA Standby

technology uses a charge-transfer methodologywhich does not bleed off excess energy as heat, but– < 1 µA Undervoltage Shutdown

instead moves energy dynamically from cell to cell as•Connects Directly to Cells, No Resistive

needed. Balancing is performed during all batteryDividers

operational modes – charge, discharge, and rest.•Internal LDO Regulator for Support Circuitry

Balancing is automatically coordinated between allcells on a PowerLAN system. PowerPump balancing•Ultrasmall Footprint, 3-mm × 3-mm

technology results in longer run time and longer cell•Millivolt Measurement Resolution Using

life.Delta-Sigma A/D Converter

The PowerLAN communications architecture has•Self-Calibrating Time Base – No Crystal

been engineered to provide robust communications inRequired

tough EMI/RFI environments while avoiding theexcessive power draw, high parts count, and elevatedcost of other solutions. PowerLAN permits easy•Uninterruptible Power Supplies (UPS)

scalability using series connections of bq76PL102dual-cell battery monitors. High-cell-count battery•Portable Medical and Test Equipment

systems of up to 12 series cells are easily•Electric Bikes and Mild-EV Battery Packs

constructed without complicated high-voltage cell•Multicell Series Strings ≥5S

measurement restrictions.

The bq76PL102 works with the bq78PL114master-gateway battery controller and bq76PL104•bq78PL114 Master Gateway Battery Controller

quad-cell monitors*.•bq76PL104 Quad-Cell Battery Monitor WithPowerPump Cell Balancing*(*Note: bq76PL104 Available 2009.)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2PowerPump, PowerLAN are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.

Vref

XT1

XT2

PUMP2S

PUMP2N

PUMP1S

PUMP1N

Oscillator

PowerLAN™ Communications

Control Logic

VLDO

SDI

SDO

VSS

Internal

Temperature

PowerPump™

BalancingLogic

D S-

A/D

D S-

A/D

2.5V

LDO

Typical

Temp

Sensor

Typical

Temp

Sensor

Cell Balancing Circuits

B0345-01

bq76PL102

SLUS887 – DECEMBER 2008 ...........................................................................................................................................................................................

www.ti.com

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled withappropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be moresusceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

Figure 1. bq76PL102 Simplified Internal Block Diagram

Product Folder Link(s) :bq76PL102

bq76PL102 Cell

MonitorWith

PowerPump

Balancing

PowerLAN

Communication

Link

PowerLAN

MasterGateway

BatteryController

bq78PL114

Pack

Positive

Pack

Negative

Example8-cellconfigurationshown

–+

SMBus

RSENSE

PackProtection

CircuitsandFuse

B0332-01

bq76PL102 Cell

MonitorWith

PowerPump

Balancing

AVAILABLE OPTIONS

bq76PL102

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Figure 2. Example Multicell PowerLAN System Implementation

The bq76PL102 is currently available in a 3-mm square QFN-16 package, bq76PL102RGT, with a ratedoperational temperature range of – 40 ° C to 85 ° C. (See Figure 5 for specific package information, dimensions, andtolerances.)

•Order bq76PL102RGTT for 250 quantity, tape and reel•Order bq76PL102RGTR for 3000 quantity, tape and reel

Product Folder Link(s) :bq76PL102

VSS

PUMP1S

VLDO

PUMP1N

TDI

PUMP2S

SDI

PUMP2N

VPP

TMD

TCK

XT1

SDO

XT2

15 14 13

5678

P0019-06

Thermal

Pad

RGTPackage

(TopView)

bq76PL102

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Figure 3. bq76PL102 Pinout (Top View)

CAUTION:

This device is subject to damage from Electrostatic Discharge (ESD). Thedevice should be stored and handled using appropriate ESD precautions toprevent damage to the internal circuitry.

PIN FUNCTIONS

I/O

(1)

DESCRIPTION

(2)NAME NO.

PUMP1N 6 OD Charge-balance gate drive for cell 1 northPUMP1S 5 OD Charge-balance gate drive for cell 1 southPUMP2N 8 OD Charge-balance gate drive cell 2 northPUMP2S 7 OD Charge-balance gate drive cell 2 southSDI 4 I PowerLAN serial data input from lower south, downstream partSDO 9 O PowerLAN serial data output to north, upstream partXT1 14 IA External temperature sensor 1 input (calibrated 50 µA)XT2 13 IA External temperature sensor 2 input (calibrated 50 µA)TCK 10 NC Do not connectTDI 3 NC Do not connectTMD 11 NC Do not connectV1 15 IA Midpoint cell connection (cell 1 positive and cell 2 negative)V2 12 P, IA Connect to most-positive cell voltage (cell 2 positive)VLDO 2 P Low-dropout regulator output – connect to VPP (bypass with 4.7 µF capacitor)VPP 16 P Connect to VLDOVSS 1 P Connect to most-negative cell voltage (cell 1 negative)— P Thermal pad – connect to VSS

(1) I - input, IA - analog input, O - output, OD - open-drain output, P - power, NC - no connect(2) Cell numbering convention is from more-negative (cell 1) to more-positive (cell 2) and is locally referenced.

Product Folder Link(s) :bq76PL102

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

bq76PL102

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over operating free-air temperature range (unless otherwise noted)

(1)

VALUE UNITS

Operating free-air temperature (ambient) – 40 to 85 ° CT

stg

Storage temperature – 65 to 150 ° CVoltage on SDO Note: not VSS-referenced (V1 – 0.5) to (V2 + 0.5)

(2)

VVoltage on SDI Limited by lower cell voltage (VSS – 0.5) to (V1 + 0.5)

(2)

VVoltage on V1 (V1 – VSS)

(2)

Maximum cell voltage – 0.5 to 5 VVoltage on V2 (V2 – V1)

(2)

Maximum cell voltage (not VSS-referenced) – 0.5 to 5 VVoltage on XT1 or XT2 With respect to VSS (VSS – 0.5) to (V1 + 0.5) VJEDEC, JESD22-A114 human-body model, R = 1500 Ω,ESD tolerance 2 kVC = 100 pFLead temperature, soldering Total time < 3 seconds < 300 ° C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratingsonly, and functional operation of the device at these or any other conditions beyond those indicated under Recommended OperatingConditions is note implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.(2) Cell numbering convention is from most negative (Cell 1) to most positive (Cell 2) and is locally referenced.

= – 40 ° C to 85 ° C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

DC CHARACTERISTICS

Two cell configuration 2.5 3.6 4.5V

CELL

(1)

Cell voltage input VOne cell configuration 2.5 3.6 4.5I

DD2

Operating current (cell 2) Measuring, reporting, or balancing 250 µAI

STBY

Standby-mode current (cell 2) Idle 50 µAI

UVM

(2)

Cell low-voltage-mode current (cell 2) V1 < 2.7 V 1 µAI

DD1

Quiescent current (Cell 1) All modes 3 µAV

General I/O characteristics I

< 1.0 mA 0 0.5 VV

General I/O characteristics I

< – 1.0 mA V

LDO

– 0.1 VV

General I/O characteristics 0.25 V

LDO

General I/O characteristics 0.75 V

LDO

CELL VOLTAGE MEASUREMENT CHARACTERISTICS

V1 measurement range 2.5 4.5 VV2 measurement range 1.6 4.5 VAnalog resolution < 1 mVAccuracy (After calibration) 25 ° C ± 5 mVAccuracy (After calibration) 0 ° C to 60 ° C ± 10 mVConversion time

(3)

80 ms

INTERNAL TEMPERATURE MEASUREMENT CHARACTERISTICS

Measurement range – 30 85 ° CResolution 0.1 ° CAccuracy (after calibration) 0 ° C to 85 ° C ± 2 ° C

(1) Device remains operational to 1.85 V with reduced accuracy and performance.(2) Condition forced by bq78PL114 command and when V1 < 2.7 V.(3) Does not include delay due to internode timing delays.

Product Folder Link(s) :bq76PL102

FEATURE SET

OPERATION

Cell-Voltage Measurement

Cell-Temperature Measurement

Cell Balancing

bq76PL102

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ELECTRICAL CHARACTERISTICS (continued)T

= – 40 ° C to 85 ° C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

EXTERNAL TEMPERATURE SENSOR(s) TYPICAL CHARACTERISTICS

(4)

Measurement range

(5)

– 40 90 ° CResolution 0.2 ° C25 ° C ± 1 ° CAccuracy

(6)

0 ° C to 60 ° C ± 2 ° C

(4) Typical for dual-diode (MMBD4148 or equivalent) external sensor using recommended circuit.(5) Range of diode sensors may exceed operation limits of IC and battery cells.(6) Typical behavior after calibration; final result depends on specific component characteristics.

The bq76PL102 dual-cell li-ion battery monitor with PowerPump balancing implements battery voltagemeasurement, temperature measurement, and balancing for one or two Li-Ion cells in series, and any number inparallel (limited by other design considerations).

Functions include:•Simultaneous, synchronous measurement of all cell voltages in a series string•Asynchronous reporting of most-recent measurements for each cell•Fully independent measurements on a cell-by-cell basis•PowerPump cell balancing using charge transfer from cell to cell•PowerLAN isolated communications to other bq76PL102 devices or bq78PL114 master-gatewaybattery-management controller•Low-power operation

Voltage measurements are made using one-per-cell precision delta-sigma analog-to-digital converters (ADC). Aninternal calibrated band-gap voltage reference is provided with each part. Measurements are performed whencommanded by the bq78PL114 master-gateway battery-management controller via the one-wire PowerLANserial communications bus. This allows all cells to be measured at exactly the same time under the same loadconditions.

Temperature measurements can be obtained using one internal and up to two external sensors. Each externalsensor consists of one (or two for increased accuracy) series-connected diodes and a capacitor for filtering. Theuse of dual diodes in a single SMT package is recommended (MMBD4148SE or equivalent). The diode can belocated up to 6 inches (15.c cm) from the circuit board. The RF filter capacitor should be co-located very close tothe diode to minimize unwanted noise coupling.

The temperature measurement subsystem uses the same dual ADCs that are used for measuring voltages.Temperature measurements are fully independent of voltage readings, and are ordinarily interleaved at afractional rate of the voltage readings by commands from the bq78PL114 master-gateway battery-managementcontroller.

Balancing is provided among any number of supported cells. The bq76PL102 and PowerLAN family ofmaster-gateway battery controllers is optimized for designs using more than four cells in series.

The patented PowerPump reactive cell balancing dramatically increases the useful life of battery systems byeliminating the cycle life fade of multicell batteries due to cell imbalance. PowerPump efficiently transfers chargefrom cell to cell, rather than simply bleeding off charging energy as heat. Charge is moved from higher-capacity

Product Folder Link(s) :bq76PL102

PowerLAN Communications

Operations Modes

bq76PL102

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cells to lower-capacity ones, and can be moved as needed between any number of series cell elements.Balancing is performed during all battery operational modes – charge, discharge, and rest. Compared to resistivebleed balancing, virtually no energy is lost as heat. The actual balance current is externally scalable withcomponent selection and can range from 10 mA to 1 A (100 mA typical) depending on application or cellrequirements. (See the reference schematic, Figure 7 .)

Algorithms for cell balancing are centrally coordinated by the bq78PL114 PowerLAN master-gatewaybattery-management controller and directed across the array of bq76PL102 dual-cell Li-Ion battery monitors.Balancing is done in both directions by the bq76PL102s within the cell stack array: north or up the cell stack andsouth or down the cell stack. Each bq76PL102 node provides the circuitry to transfer (pump) the charge from cellto cell to provide balancing. The balancing algorithm is implemented in the bq78PL114 master-gateway batterycontroller, and commands are communicated to the bq76PL102s via the PowerLAN communications link. Bytracking the balancing required by individual cells, overall battery safety is enhanced – often allowing earlydetection of internal micro-shorts or other cell failures.

Cell balancing pumping, or charge transfer from one cell to another, is accomplished using a circuit that forms asimple flyback converter under control of the bq76PL102, which is in turn controlled by the master gateway. Theoutputs of PUMP nd (cell number, direction) control MOSFET transistors which charge an inductor from one celland then discharge the inductor into an adjacent cell through the intrinsic body diode of the other MOSFET.•PUMP1S: Pumps charge from cell 1 to the next lower cell (closer to battery negative). This signal is unusedby the first or lowest cell in the string.•PUMP1N: Pumps charge from cell 1 to cell 2.•PUMP2S: Pumps charge from cell 2 to cell 1•PUMP2N: Pumps charge from cell 2 to the next higher cell in a pack (closer to battery positive). This signal isunused by the highest cell in the string.

PowerLAN communications technology is a patented serial network and protocol designed specifically for batterymanagement in a multicell environment. PowerLAN is used to initiate and report measurements of cell voltageand temperature, as well as control cell balancing. Using only a capacitor, PowerLAN isolates voltages fromadjacent bq76PL102 parts to permit high-voltage stack assemblies without compromising precision andaccuracy. PowerLAN is expandable to support up to 12 cells in series, with each bq76PL102 handling two seriescells. PowerLAN provides high ESD standoff and high immunity to noise generated by nearby digital circuitry orswitching currents. Each bq76PL102 has both a PowerLAN serial input and serial output pin. Received data isbuffered and retransmitted, permitting high numbers of nodes without loss of signal fidelity. Signals arecapacitor-coupled between nodes to provide high dc isolation.

The bq76PL102 normally operates in one of two modes: active or standby. The bq76PL102 is normally instandby mode and consumes typically less than 50 µA. The low-dropout regulator output is still functional in thismode, as are internal system protection functions (undervoltage, communications timeout, etc.)

When a PowerLAN communications event occurs, then the bq76PL102 transitions to active mode and powerconsumption increases to 200 A typically. The bq76PL102 stays in this mode to complete any measurements orcell-balancing pumping operations. Once activity in this mode ceases, the return to standby is automatic, thusreducing overall power consumption.

An undervoltage ultralow-power-consumption mode is also available when initiated by the bq78PL114master-gateway battery controller and when the cell voltages drop below a preset threshold. This mode is usedto preserve battery capacity during long periods of non-use and therefore has a power consumption ofapproximately 1 µA.

Note that cell balancing currents are external to the bq76PL102 and may be sized according to the needs of theapplication (typically 10 mA to 1 A). These currents are fixed by the cell-balancing circuitry and only enabled ordisabled by the bq76PL102 (under control of the bq78PL114) to achieve the necessary cell-balance operations.

Product Folder Link(s) :bq76PL102

COMPLEMENTARY PRODUCTS

PowerLAN Master Gateway Battery Controller

bq76PL102

www.ti.com

The bq78PL114 master-gateway battery-management controller with PowerPump cell balancing from TexasInstruments is the central controller for a complete multicell battery system.

This advanced master-gateway battery controller works with up to 12 series cells monitored by bq76PL102 orbq76PL104* (*available 2009) cell monitors to provide battery voltage, temperature, current and safetymonitoring; state-of-charge and state-of-health information; system-wide internal PowerLAN communications; aswell as external communications of battery parameters via the industry-standard SMBus interface.

Product Folder Link(s) :bq76PL102

PowerLAN Quad-Cell Battery Monitor* (Available 2009*)

bq78PL114

PowerLAN

GatewayBattery

Management

Controller

RPRE

+PACK+

–

RSENSE

PACK–

XT1–XT4

Temperature

Sensor(typ.)

SPROT

LED1–LED5

Typicalsix-cellconfigurationshown.

AdditionalcellsaddedviaPowerLANconnection.

Somecomponentsomittedforclarity.

VLDO2

CRFI

VLDO1

RSTN

SDO2

SDI3

Oneof4external

sensorsshown

P-LAN

CELL 6

CELL 5

SDI1

SDO0

Level-ShiftCircuits

CHG

DSG

PRE

ESDProtection

SMBCLK

SMBDAT

SMBus

ThermalPad

VSS

CSBAT

CCBAT

CCPACK

CSPACK

CellBalancing

Circuits

CellBalancingCircuits

bq76PL102

CELL 4

CELL 3

CELL 2

CELL 1

S0342-03

bq76PL102

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Figure 4. bq78PL114 Simplified 6-Cell Gateway Controller Circuit With bq76PL102

Product Folder Link(s) :bq76PL102

VSS

PUMP2S

PUMP2N

PUMP1N

bq76PL102

SDI

SDO

0.001

3300pF

20k

15µH

3300pF

20k

15µH

PowerPad

VLDO

VPP

PUMP1S

XTMPx

PowerLAN™

0.001

To Node n + 1

To Node n – 1

PowerPump™ Circuit

V1 n+1

V2 n

V1 n+1

–

V1 n

V2 n

–

V1 n

–

V2 n – 1

Typical

Temperature

Sensor

MMBD4148SE

Typical 2cell circuit shown,

somecomponents omitted

forclarity.

PUMP1S (Next part below)

ToNode n – 1

PUMP1S (Next part above)

ToNode n+1

S0388-01

bq76PL102

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Figure 5. bq76PL102 Simplified Example Operating-Circuit Diagram

Product Folder Link(s) :bq76PL102

bq76PL102

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Figure 6. Higher-Balancing-Current bq76PL102 Operating-Circuit Diagram

Product Folder Link(s) :bq76PL102

equivalent

resistance

UsedforSafetyEvents

UsedforDeviceTemp.

T1=CELL1TEMP.

T2=CELL2TEMP.

T3=CELL3TEMP.

T4=CELL4TEMP.

T5=CELL5TEMP

T6=CELL6TEMP.

T7=CELL7TEMP.

T8=CELL8TEMP.

TEMP-FETS=FETTEMP.&USEDFORSAFETY

TEMP-PCB=TEMP.OFU4

stargroundpoint located atR3

Keepthis connection toBATT-asshortandLowZaspossible.

CHG

DSG

PRE

EFCIC

EFCID

CCBAT

7CCPACK

VLDO1

CSBAT

10 CSPACK

OSCI

OSCO

13 SDO0

14 SDI1

15 P1N

16 P2S

17 P2N

18 SDO2

19 SDI3

20 P3S

21 P3N

22 P4S

23 P4N

P-LAN

25 RSTN

SPI-CLK

SPI-DI

SPI-DO

SELECT

SPROT

LEDEN

LED1

LED2

LED3

LED4

LED5

SMBCLK

SMBDAT

39 V4

XT4 41

XT3

42 V3

43 VLDO2

44 V2

XT2 46

XT1

47 V1

48 VSS

49 TAB

bq78PL114

10uF

R44

10K

C38

0.1uF

C27 1000pF

C28

10uF

C43

0.1uF

1.0uF

100K

C11

1000pF

R28

4.7K

R27

4.7K

R49

100R R50

100R

10uF

C10 1000pF

R54

100R

R55

100R

R43

1.0M

R51

1.0M

15 V1

12 V2 14

T1 13

11 TMD

10 TCK

3TDI

8P2N

7P2S

6P1N

5P1S

VLDO

VPP

SDO 4

SDI

17 TAB

1VSS

U3 BQ76PL102

C40

1.0uF

C44

1.0uF

C39

1.0uF

C41

1.0uF

R10

R30 20K

R29 20K

C12

3300pF

C13

3300pF

Q1-A

FDC6327C

Q1-B

FDC6327C

4.7uH

C30

22uF D10

MA21D3800L

SMBUS-PORT

0.005R

1.0M

5.6VDC

MMBD4148SE

C6 1000pF

MMBD4148SE

C37 1000pF

TEMP-PCB

MMBD4148SE

C45

1000pF

TEMP-FETS

MMBD4148SE

C46

1000pF

R11 20K

R12 20K C14

3300pF

C15

3300pF

Q2-A

FDC6327C

Q2-B

FDC6327C

4.7uH

MA21D3800L

R13

R14 20K

R15 20K

C17

3300pF

C18

3300pF

Q3-A

FDC6327C

Q3-B

FDC6327C

4.7uH

C19

22uF

MA21D3800L

R16

R20 20K

R24 20K C21

3300pF

C22

3300pF

Q4-A

FDC6327C

Q4-B

FDC6327C

4.7uH

C23

22uF

D11

MA21D3800L

D12

MA21D3800L

R31

R32 20K

R33 20K

C20

3300pF

C24

3300pF

Q5-A

FDC6327C

Q5-B

FDC6327C

4.7uH

C25

22uF

D13

MA21D3800L

D14

MA21D3800L

R34

R35 20K

R36 20K C32

3300pF

C33

3300pF

Q6-A

FDC6327C

Q6-B

FDC6327C

4.7uH

C34

22uF

D15

MA21D3800L

D16

MA21D3800L

R37

R38 20K

R39 20K

C35

3300pF

C36

3300pF

Q7-A

FDC6327C

Q7-B

FDC6327C

4.7uH

C47

22uF

D17

MA21D3800L

D18

MA21D3800L

C29

10uF

C51

10uF

MMBD4148SE

C52

1000pF

MMBD4148SE

C53

1000pF

C48 1000pF

C49

10uF

15 V1

12 V2 14

T1 13

11 TMD

10 TCK

3TDI

8P2N

7P2S

6P1N

5P1S

VLDO

VPP

SDO 4

SDI

17 TAB

1VSS

U2 BQ76PL102

C54

10uF

C55

10uF

MMBD4148SE

C56

1000pF

MMBD4148SE

C57

1000pF

PACK+

PACK-

Q11

MMBFJ201

Q12

BC846ALT1G

Vcebr=65V

R53

560K

R56

200K

ZR2

12.0VDC

BZT52C12-7-F

R58

30K

R59

1.0M

Q13

IRF4905PBF

GQ8

MMBFJ201

BC846ALT1G

Vcebr=65V

R40

560K R41

200K

ZR1

12.0VDC

BZT52C12-7-F

R45

30K

R46

1.0M

Q10 IRF4905PBF

C60

0.1uF

C61

0.1uF

Q15

BC846ALT1G

Vcebr=65V

R17

1.0M

R52

30K

R60

1.0M

Q16

STB16NF06LT4 R18

22uF

R19

1.0M

R25

1.0M

D23

D24

D25

D26

D27

1000pF

Q14

BSS138

0.1uF

Q17

FDV304P

100K

MMBD4148SE

C8 1000pF

MMBD4148SE

C16 1000pF

C42

0.1uF

C50

0.1uF

CELL1

CELL2

CELL3

CELL4

CELL5

CELL6

CELL7

CELL8

VSS

VLDO1

VSS

VLDO1

S002

bq76PL102

www.ti.com

Figure 7. Reference Schematic

Product Folder Link(s) :bq76PL102

IMPORTANT NOTICE
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