4

FN9139 .1

April 19, 2005

Pin Description

VIN

VIN is the input power source. Connect to a wall adapter.

RED, GRN

RED and GRN are two open-drain outputs to drive a red and

a green LED in the same package. The RED and the GRN

pins are guaranteed to be capable of sinking at least 5mA

current.

TIME

The TIME pin determines the oscillation period by

connecting a timing capacitor between this pin and GND.

The oscillator provides a time reference for the charger.

GND

GND is the connection to system ground.

V2P9

This is a 2.9V untrimmed voltage output. This pin outputs a

2.9V voltage source when the input voltage is above POR

threshold, independent on the EN pin input. The V2P9 pin

can be used as an indication for adapter presence.

EN

EN is the enable logic input. Connect the EN pin to LOW to

enable the charger or leave it floating to disable the charger.

This pin is pulled up to 2.9V when left floating.

IREF

This is the programming input for the constant charging

current in a linear charger. In the typical application of a

dual-mode charger, the IREF pin programs the trickle charge

current as well as the protection current level.

IMIN

IMIN is the programmable input for the end-of-charge

current.

TEMP

TEMP is the input for an external NTC thermistor.

DT

DT is the input to set the temperature difference before and

after the charging starts. This pin can also be used as an

indication whether or not the charger is charging.

VSEN

VSEN is the battery voltage sensing input. This pin allows

remote sense of the battery pack voltage.

BAT

BAT is the charger output.

Typical Application

VIN

V2P9

TEMP

GND

BAT

Input

C

1

To Battery

C

3

BAT+

BAT-

ID

R

1

R

2

R

T

C

2

DT

RED

GRN

D

2

D

1

EN

TIME

C

TIM E

IREF

R

IREF

IMIN

R

IM IN

VSEN

C

4

R

3

R

S

R

4

R

5

ISL6292B