RT4723

Copyright © 2016 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS4723-00

April

2016

www.richtek.com

3

Function Block Diagram

N1

P1

SCP1

VOP

C1N

VIN

GND

PGND

LXP

PWM

Logic

UVLO

OCP1

SCP2

VON

DAC

+

-

Oscillator

Pulse

Counter

VREF

Bandgap

Reference

-0.33x/-0.5x

Charge Pump

C1P

Soft-Start

LDO

+

-

GM

DAC

SWIRE

Fast

Discharge

VOP

VON

BOOST

C2P

C2N

Operation

The RT4723 is a highly integrated Boost, LDO and

inverting charge pump to generate positive and

negative output voltage. It can support input voltage

range from 2.5V to 4.6V and the output current up to

30mA. The VOP positive output voltage is set at a

typical value of 4.6V. The VON negative output voltage

is set at a typical value of -2.4V and can be

programmed through single wire protocol (SWIRE pin).

The available voltage range is from -0.6V to -2.4V with

100mV

per

step.

The

RT4723

provides

Over-

Temperature Protection (OTP) and Short Circuit

Protection (SCP) mechanisms to prevent the device

from damage with abnormal operations. When the

SWIRE voltage is logic low for more than 350us, the IC

will be shut down with low input supply current less

than 1

A.