4

FN9215.1

March 20, 2007

Pin Description

Typical Application

PIN #

PIN NAME

DESCRIPTION

1, 15, 16

VIN

VIN is the input power source. It is recommended to have a 1

Ω resistor in series with the input decoupling capacitor to

prevent an over-shoot voltage when the input cable is plugged in.

2GRN

Open-drain LED drive pin. This pin sinks a constant-current 10mA to drive a green LED in a bi-color LED pack.

3RED

Open-drain LED drive pin. This pin sinks a constant-current 10mA to drive a red LED in a bi-color LED pack.

4

TIME

Timer Programming Input. 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.

5

GND

GND is the connection to system ground.

6

DT

Delta Temperature Setting Input. This pin sets 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.

7EN

Enable Input. Connect EN LOW to enable the charger. Pull it HIGH or leave it floating to disable the charger. This pin is

pulled up to 2.9V when left floating.

8

V2P9

Untrimmed 2.9V 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 output is used to power the LEDs, the NTC circuit, or for other functions. The

maximum output current is 30mA. This output can also be used as an indication for adapter presence.

9IREF

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.

10

IMIN

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

11

TEMP

Temperature setting input. An external NTC thermistor is connected to this pin for ambient temperature sensing.

12

VSEN

Battery remote voltage sensing feedback pin. This pin allows remote sense of the battery pack voltage. Connect this pin

as close as possible to the battery positive terminal with a separate trace to minimize the impact of parasitic resistance.

This pin also serves the function of compensating for voltage drop caused by the connector contact resistance.

13, 14

BAT

BAT is the charger output.

-

EPAD

Exposed Pad. This pad is internally connected to GND. Connect as much copper as possible to this pad on the component

or other layers through thermal vias to maximize the thermal performance.

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

TIME

IREF

R

IREF

IMIN

R

IMIN

VSEN

C

4

R

3

R

S

NOTE: Temperature limit

components selected for a

temperature Range of -5°C

to +45°C (not charging)

See Example, page 14

Input

ISL6297