RT9501A/B

Preliminary

3

DS9501A/B-07 March 2007

www.richtek.com

Function Block Diagram

Functional Pin Description

Pin Name

Pin Function

VDD

Supply Voltage Input.

TS

Temperature Sense Input. Input from battery temperature monitoring circuit.

STAT

Charge Status Output. 3-state status indication of charge, charge complete and temperature fault or

disable or sleep mode.

GND

Ground.

CC

Charge Control Output. Current output to drive on external PNP transistor or P-Channel MOSFET

for current and voltage regulation.

FB/CE

External Feedback Input or Charge Enable Function. Input from controller or finely adjust the battery

regulated voltage with external voltage divider.

CS

Current Sense Input. Charge current is sensed according to the voltage drop from supply voltage to

this pin.

BATT

Battery Voltage input. Input directly from battery voltage.

Control

Logic

Internal FB

Feedback

Determination

& Enable Control

VDD

VDD

V

REF1

V

REF2

V

REF3

V

REF4

FB2

FB2

FB2

CC

CS

STAT

FB2

BATT

VDD

FB/CE

FB2

+

-

+

-

+

-

+

-

+

-

+

-

+

-

Sleep Mode Detection

CC

Control

CV

Control

Precharge

Recharge

TS1 Trip

TS2 Trip

GND

TS