AIC1843 datasheet(1/14 Pages) AIC

Part #	AIC1843

Description	High Efficiency 1.5X charge Pump For White LEDs Backlighting

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Manufacturer	AIC [Analog Intergrations Corporation]

Direct Link	http://www.analog.com.tw

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AIC1843

High Efficiency 1.5X charge Pump

For White LEDs Backlighting

Analog Integrations Corporation

3A1, No.1 Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan

DS-1843G-03 080907

TEL: 886-3-5772500

FAX: 886-3-5772510 www.analog.com.tw

1

FEATURES

1MHz Switching Frequency

2.7V to 5.5V Input Voltage Range

Low Shutdown Current: ≦1

µA

Regulated 20mA Full-Scale Output Current

32-Position Linear Scale with Digital Control

High Accuracy Brightness Matching

33% Less Input Current Than Doubler Charge

Pump

No Inductors Required

Build-in Soft-Start

Current Limit and Over Temperature Protection

12-Pin DFN Package

APPLICATIONS

Cellular Phones

PDAs

Digital Still Cameras

Handheld Devices

White LED Backlighting

GENERAL DESCRIPTION

The AIC1843 provides 4 LED current source

outputs with regulated constant current for uniform

intensity. The AIC1843 is the low noise, constant

frequency charge pump DC/DC converter that

uses 1.5X conversion to increase efficiency in

white LED applications. The devices can be used

to produce current levels up to 20mA for each

output from a 2.7V to 5.5V input. Low external

parts counts (two 1μF flying capacitors and two

small bypass capacitors at VIN, and OUT) make

the AIC1843 ideal for small, battery-powered

applications.

EN/SET interface is used to enable, disable and

set the LED current for a 32 level logic scale LED

brightness control. Built-in current limiting, with

thermal shutdown provides protection to the

AIC1843 against fault conditions. Automatic soft-

start circuitry prevents excessive inrush current

during start-up. 1MHz high switching frequency is

enable to use tiny external components.

The AIC1843 is available in a 12-pin thin DFN

package.

TYPICAL APPLICATION CIRCUIT

D2

D3

D4

C1+

C1-

OUT

C2+

C2-

GND

VIN

EN/SET

D1

AIC1843

U1

EN/SET

Vin=2.7V~5.5V

1uF

CFLY2

1uF

Cout

1uF

Cin

1uF

CFLY1

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