RT9513

2

DS9513-01 April 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin Nam e

Pin Function

1

ACIN

Wall Adaptor Charge Input Supply.

2, 7, 9

NC

No Internal Connection.

3

CHG_S

Charge Status Indicator Output (open drain).

4

PGOOD

Power Good Indicator Output (open drain).

5

GND

Ground.

6

ISETA

Wall Adaptor Supply Charge Current Set Point.

8

EN

Charge Enable Input (active low).

10

BATT

Battery Charge Current Output.

Exposed Pad (11) GND

Ground. The exposed pad must be soldered to a large PCB and connected to

GND for maximum power dissipation.

Function Block Diagram

Precharge

+

-

2.5V

Recharge

+

-

2.5V

+

-

Thermal

Sense

V/I

0.25V

2.5V

2.5V

V/I

+

-

Precharge

2.5V

0.25V

0.5V

+

-

Charge Done

0.25V

Logic

+

-

Charge

Disable

0.9V

1uA

Precharge

Comparator

Recharge

Comparator

ACIN

ISETA

BATT

Voltage

Amplifier

Current

Amplifier

Tcrmination

Comparator

VCC

115 C

CHG_S

PGOOD

EN

Charge Input

Selection

OVP

+

-

2.5V

OVP

Comparator

ACIN

PFET

SENSE

FET

GND