Coloumb

Counter

HWOver

Current &

ShortCircuit

Protection

CellVoltage

Multiplexer

N-ChannelFET

Drive

PreChargeFET

&

GPODDrive

PowerMode

Control

SMBD

VC5

VC4

VC3

VC2

VC1

SMBC

CellBalancing

Temperature

Measurement

DataFlash

Memory

SMB1.1

Impedance

Track ™

GasGauging

SHA-1

Authentication

Over & Under

Voltage

Protection

Voltage

Measurement

OverCurrent

Protection

Oscillator

Charging

Algorithm

FuseBlow

Detectionand

Logic

Over

Temperature

Protection

Watchdog

Regulators

RESET

ALERT

REG33

REG25

VCELL+

MSRT

RBI

SystemControl

AFEHWControl

Pack-

RSNS

5m

-20m

typ.

W

W

Pack+

SMBC

SMBD

bq20z45–R1

GND

VC4

VC3

VC2

VC1

VDD

OUT

CD

bq294xx

1

DSG

2

PACK

3

11

VCC

ALERT

4

12

ZVCHG

PRES

5

13

6

14

PMS

TS2

7

15

VSS

PFIN

8

16

REG33

SAFE

9

17

TOUT

SMBD

10

18

19

VCELL+

SMBC

NC

CHG

38

BAT

37

VC1

VSS

36

28

VC2

RBI

35

27

VC3

REG25

34

26

VC4

VSS

33

25

VC5

MRST

32

24

ASRP

GSRN

31

23

ASRN

GSRP

30

22

RESET

VSS

VSS

29

21

20

GPOD

TS1

bq20z45-R1

SLUS992 – DECEMBER 2009

www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

SYSTEM PARTITIONING DIAGRAM

bq20z45-R1

DBT PACKAGE

(TOP VIEW)

2

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Product Folder Link(s): bq20z45-R1