RT9823 datasheet(2/7 Pages) RICHTEK

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RT9823

DS9823-02 June 2011

www.richtek.com

Function Block Diagram

Pin No.

Pin Name

Pin Function

CTR

Reset Output (Open Drain, Active-Low) . When VCC > POR, V5 > 80%, and VADJ > 1V,

CTR will delay 300ms and become high. Once V5 or VADJ is < 80%, the signal will

become low. When MR is high, CTR will become low.

GND

Ground.

Manual Reset Input. Manual reset with internal pull high resister (1M

Ω) , H : CTR = Low;

L : CTR signal is dependent on voltage detector output.

VADJ

Voltage Detection Input. Connect 12V or other power with external resistive voltage

divider to this pin. The VADJ logic-high threshold voltage is 1V.

5V Voltage Detection Input. The detection threshold is 5V x 80%.

VCC

Supply Input. Connect this pin to standby power from system.

Functional Pin Description

Typical Application Circuit

GND

VCC

VADJ

RT9823

3.3V or 5V

12V

Manual Reset

CTR

µP

VDD

100k

Pull Up

RESET

Delay

300ms

Voltage

Regulator

POR

Voltage Detector

(VTH = 1V)

VCC

VADJ

VREF

Voltage Detector

(VTH = 5V x 80%)

CTR

GND

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