RT9516

3

DS9516-01 April 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

VIN

Input Power Source. The VIN can withstand up to 28V input.

2,

9 (Exposed Pad)

GND

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

to GND for maximum power dissipation.

3

ISET

Charge Current Set Point.

4

ABI

Auto-Booting External Input. ABI is pulled to GND through an internal 200k

Ω

resistor.

5

ABO

Auto-Booting Logic Output.

6

EN

Charge Enable (Active Low). With internal 200k

Ω pull low resistor.

7

PGOOD

PGOOD pin connect to VIN with 10

Ω N-MOSFET as power good condition.

8

BATT

Battery Charge Current Output.

Flow Chart

Standby State

P-MOSFET = OFF

BATT > 2.5V

Soft-Start

Power Off State

P-MOSFET = OFF

Any State or

EN = H

YES

NO

Sleep State

P-MOSFET = OFF

NO

Fast-Charge

CV State

Pre_Charge

EN = H

YES

YES

NO

YES

NO

BATT

V4.2V

≥