RT9824 datasheet(2/8 Pages) RICHTEK

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RT9824

DS9824-01 April 2011

www.richtek.com

Function Block Diagram

Pin No.

Pin Name

Pin Function

CTR

Control Output (Open Drain, Active-Low). Only when VCC is > POR, V5 is > 80%, V54 is

> 80%, and VADJ is > 1V, the CTR will delay 300ms and become high. Once V5 or V54

or VADJ is <80%, the signal will become low. When MR is high, CTR will become low.

RESET

RESET Output (Open Drain, Active-Low). Only when VCC is > POR, V5 is > 80%, V54 is

> 80%, and VADJ is > 1V, the RESET will delay 300ms and become high. Once V5 or

V54 or VADJ is < 80%, the signal 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 resister divider to this

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

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

V54

54V Voltage Detection Input. The detection threshold is 5.4V x 80%.

VCC

Connect this Pin to Standby Power from system.

Functional Pin Description

Typical Application Circuit

Delay

300ms

Voltage

Regulator

POR

Voltage Detector

(VTH = 1V)

VCC

VADJ

V54

CTR

VREF

Voltage Detector

(VTH = 5V x 80%)

Voltage Detector

(VTH = 5.4V x 80%)

RESET

GND

CTR

GND

VCC

VADJ

V54

RT9824

3.3V or 5V

12V

Manual Reset

5.4V

100k

Pull Up

RESET

µP

VDD

RESET

µP

VDD

CTR

100k

Pull Up

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