Advanced Lithium-Ion

Battery-Pack Protector

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9

BIAS

B4P

CQI_FAULT

550ms

TIMER

SET/RESET

WARNING

OV-FAULT

UV-FAULT

CM-FAULT

PKF

WRN

DQI_FAULT

TKO

SRC

SRC

SHUTDOWN

CHARGE

DQI_HI

CQI_HI

OV_FAULT

UV_FAULT

CM_FAULT

UV_FAULT

WARNING

UV_FAULT

CGI

OV_FAULT

CM_FAULT

OV_FAULT

CM_FAULT

UV_FAULT

Q

D

RB

30µA

CGO

B4P

B3P

B2P

BIP

GND

CMP_P

CMP_N

LATCH_CM

LATCH_UV

LATCH_OV

LATCH_WRN

CMP

OVA

UVA

MMA

GND

GND

PKN

SRC

B4P

200mV

300mV

30µA

N

N

N

1V

REF

1.221V

CK

CQI_FAULT

CGI

3.3V

LINEAR

REG.

THRESHOLD

VOLTAGE

SELECTOR

CELL

VOLTAGE

SELECTOR

STATE

MACHINE

50kHz

OSC

OSC

"1"

CM_FAULT

UV_FAULT

Q

D

RB

30µA

N

N

N

N

GND

DSO

CK

DQY_FAULT

DSI

"1"

REG

EARLY

WARNING

REG

OVER-

VOLTAGE

REG

UNDER-

VOLTAGE

REG

CELL

MISMATCH

UVO

GND

GND

MAX1666

Figure 1. Functional Diagram