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Document Number: 71321

S09-2249-Rev. C, 26-Oct-09

Vishay Siliconix

Si9731

PIN CONFIGURATION

ORDERING INFORMATION

Part Number

Temperature Range

Package

Si9731DQ

- 40 to 85 °C

Tape and Reel

4.1 V_TAP

CHARGERPOWER_ON = (XCHARGERPOWER_ON)

CHARGERPRESENT = (XCHARGERPRESENT)

16

15

14

13

1

2

3

4

12

11

10

9

5

6

7

8

CHARGERPRESENTIN

CHARGERPOWER_ONIN

GND

(N/C)

ON/OFF

(N/C)

TRICKLECHARGEEN

CVMODE

MAINCHARGEEN

TSSOP-16

Top View

Si9731DQ

Eval Kit

Temperature Range

Board Type

Si9731DB

- 40 to 85 °C

Surface Mount

PIN DESCRIPTION

Pin Number

Name

Function

1

CHARGERPRESENTIN

Logic input for CHARGERPRESENT output

2

CHARGERPOWER_ONIN Logic input for CHARGERPOWER_ON output

3

External charger

4ON/OFF

Master shutdown pin. Taking ON/OFF low shuts down the charger and quiescent current drops

to under 1 µA

5

TRICKLECHARGEEN

Taking this pin high disables trickle (slow) charging

6CVMODE

A logic high enables the error amplifier to linearly drive the gate of MOSFET Q1 when

MAINCHARGEREN is high.

7

MAINCHARGEEN

An external PWM signal at MAINCHARGEREN pin controls the ON/OFF duty cycle of the Fast

Charge MOSFET, Q1.

8, 10

N/C

Do not connect external circuitry to this pin. Circuitry internal to the IC is connected to this pin.

9

Internal 1.30 V precision bandgap reference voltage. Do not apply loads to this pin.

11

GND

Low impedance system ground

12

4.1 V_TAP

13

14

Charger output connected to battery’s positive terminal

15

CHARGERPOWER_ON

Open drain logic output

16

CHARGERPRESENT

Open drain logic output