Advanced Li+ Battery-Pack Protectors

6

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PIN

NAME

FUNCTION

1

B4P

Cell 4 Positive Connection. Short B4P to B3P for MAX1924V.

Supply Input. Connect this pin to the top of the battery pack through a diode and a capacitor

(see the Typical Application Circuit).

3

B3P

Cell 3 Positive Connection

4

IC3

Internal Connection. Float this pin.

5

B2P

Cell 2 Positive Connection

6

IC2

Internal Connection. Float this pin.

7

B1P

Cell 1 Positive Connection

8

IC1

Internal Connection. Float this pin.

9BN

Battery Negative. Connection for the cell 1 negative terminal and the top of the current-sense

10

PKN

11

CTL

Control Input. Drive CTL low for normal operation. Drive CTL high to turn off the three external

protection MOSFETs.

12

SHDN

Shutdown. Drive SHDN low for normal operation. Drive SHDN high to put the device into shutdown

if no charger is present.

13

TKO

Trickle-Charge Driver Output. TKO drives the gate of an external P-channel trickle-charge MOSFET

low (on) in normal operation.

14

CGO

Fast-Charge Driver Output. CGO drives the gate of an external P-channel fast-charge MOSFET low

(on) in normal operation.

15

DSO

Discharge Driver Output. DSO drives the gate of an external P-channel discharge control MOSFET

low (on) in normal operation.

16

SRC

Common Source Connection for MOSFETs. SRC provides the bias for gate drivers DSO, TKO,

and CGO.

Pin Description

DISCHARGE-CURRENT FAULT TIMING

MAX1894 toc10

100mV/div

0

0

DSO

5V/div

1ms/div

CHARGE-CURRENT FAULT TIMING

MAX1894 toc11

100mV/div

0

0

1ms/div

CGO

5V/div

PACK-SHORT CURRENT FAULT TIMING

MAX1894 toc12

200mV/div

0

0

100

µs/div

DSO

5V/div

Typical Operating Characteristics (continued)