RT9903GQV RICHTEK [Richtek Technology Corporation], RT9903GQV Datasheet

RT9903GQV

Manufacturer Part Number

RT9903GQV

Description

5 Channel DC/DC Converters IC with High-Efficiency Step-Up

Manufacturer

RICHTEK [Richtek Technology Corporation]

Datasheet

1.RT9903GQV.pdf (15 pages)

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5 Channel DC/DC Converters IC with High-Efficiency Step-Up

General Description

The RT9903 is a complete power-supply solution for digital

still cameras and other hand-held devices. It integrates a

high-efficiency fours step-up DC-DC

charge pump.

The two Step-up DC-DC converters (CH1,CH2) accept

inputs from 1.5V to 5.5V and regulate a resistor-

adjustable output up

converter (CH3) can be regarded as white LED Driver,

which reference voltage is 0.2V and have OVP function.

One step-up DC-DC converter (CH4) regulate a resistor-

adjustable output up 5V. An adjustable operating

frequency (up to 1.4MHz) is utilized to get optimum size,

cost, and efficiency.

The feature of the charge pump (CH5) is to deliver few

current to CCD negative voltage.

RT9903 is available in VQFN-24L 4x4 package. Each

DC-DC converters have independent shutdown inputs.

Applications

Ordering Information

Note :

Richtek Pb-free and Green products are :

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area, otherwise visit our website for detail.

DS9903-07 August 2007

RT9903

Digital Still Camera

PDAs

Portable Device

RoHS compliant and compatible with the current require-

Suitable for use in SnPb or Pb-free soldering processes.

100% matte tin (Sn) plating.

ments of IPC/JEDEC J-STD-020.

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

Package Type

QV : VQFN-24L 4x4 (V-Type)

cial Standard)

to 17V.

One Step-up DC-DC

converters and a

Preliminary

Features

Pin Configurations

Two step-up DC-DC Converters (CH1, CH2)

One Step-up DC-DC Converter (CH3)

One Step-up DC-DC Converter (CH4)

Step-up Charge Pump (CH5) for CCD Negative

Voltage

Up to 1.4MHz Switching Frequency

1μ μ μ μ μ A Supply Current in

External Compensation Network for All Converters

Programmable Soft Start Function (CH1, CH2, CH3,

CH4)

Independent Enable Pin to Shutdown Each

Channel

24-Lead VQFN Package

RoHS Compliant and 100% Lead (Pb)-Free

HV Internal Switches

50mA Load Current

0.2V Reference Voltage

HV Internal Switches

LED Brightness Dimming Control

Over Voltage Protection

External Switches

External Current Limit Setting

HV Internal Switches

FB_CP

EXT4

INCD

CS4

VQFN-24L 4x4

(TOP VIEW)

GND

Shutdown Mode

RT9903

www.richtek.com

LX1

VDD

PGND

EN4

EN2

EN1

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