RT9718DZQW 查看數據表（PDF） - Richtek Technology

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RT9718DZQW

Over Voltage Protection IC

Richtek Technology 

RT9718

Typical Application Circuit

RT9718

VIN

1 VIN

VOUT 8

CIN

1µF

Chip Enable

5 EN

2 GND

VB 6

ILIM 7

WRN 4

COUT

1µF

Charger IC

(RT9502)

RVB

200k

RILIM

+

25k

To System

Battery

Functional Pin Description

Pin No.

1

Pin Name

Pin Function

VIN

The input power source. The VIN can withstand up to 28V input.

2

GND

Analog Ground.

3

NC

No Internal Connection.

4

WRN

This is an open-drain logic output that turns LOW when any protection event occurs.

5

EN

Chip Enable (Active Low). Pull this pin to low or leave it floating to enable the IC and

force it to high to disable the IC.

6

VB

Battery voltage monitoring input. This pin is connected to the battery pack positive

terminal via an isolation resistor.

7

ILIM

Over current protection threshold setting pin. Connect a resistor between this pin

and GND to set the OCP threshold.

8

VOUT

9 (Expose Pad) GND

Output through the power MOSFET.

The exposed pad must be soldered to a large PCB and connected to GND for

maximum thermal dissipation.

Function Block Diagram

VIN

VOUT

VREF

Ibias

VDD

BASE Driver

OCP

OCP

Seting

ILIM

INOVP

UVLO

Control

Buffer

Logic

BATOVP

VB

EN

EN

Logic

OTP

WRN

GND

www.richtek.com

2

DS9718-02 May 2011

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