RT4730 datasheet(7/17 Pages) RICHTEK

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RT4730

DS4730-01

March 2017

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Functional Block Diagram

Gate

Drive

VOUT

AGND

Control

Logic

VREF

Digital

Control

LX1

AVIN

OVP

OTP

UVLO

OCP

AVDDEN

SCP

OSC

AVDD

LX2

AMP

PVIN

PGND

OVDD

Negative

Charge

Pump

C1P

C1N

VON

OVSS

CPGND

SWIRE

Operation

The RT4730 is a highly integrated power solution with

Buck-Boost, and inverting charge pump to generate

positive and negative output voltage. The output voltages

can be adjusted with by SWIRE interface protocols. The

OVDD voltage range is from 2.8V to 4V with 100mV per

step. The OVSS voltage is from

−0.6V to −4V with 100mV

per step. The AVDD positive output voltage is set at a

typical value of 3.3V. With its input voltage range of 2.9V

to 4.8V, the RT4730 is optimized for products powered

by single-cell batteries and symmetrical output current

up to 50mA. The RT4730 provides Over-Temperature

Protection (OTP) and Short Circuit Protection (SCP)

mechanisms to prevent the device from damage with

abnormal operations. When the SWIRE and AVDDEN

voltage are logic low, the IC will be shut down with low

input supply current less than 2

μA.

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