AAT3132ITP-1-T1(2004) データシートの表示（PDF） - Analog Technology Inc

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AAT3132ITP-1-T1
(Rev.:2004)

High Efficiency 1.5X Fractional Charge Pump for White LED Applications

Analog Technology Inc 

AAT3132

High Efficiency 1.5X Fractional Charge

Pump for White LED Applications

General Description

The AAT3132 is a low noise, constant frequency

charge pump DC/DC converter that uses fractional

(1.5X) conversion to maximize efficiency for White

LED applications. The device can be used to pro-

duce current levels up to 20mA in three of its out-

puts, and up to 25 or 30mA in one of its outputs to

drive LEDs from a 2.7V to 5.5V input. Outputs may

be operated individually or paralleled for driving

higher-current LEDs. Low external parts count (two

1µF flying capacitors and two small 1µF capacitors

at VIN, and OUT) make the AAT3132 ideally suited

for small battery-powered applications.

AnalogicTech™'s Simple Serial Control™

(S2Cwire™) interface is used to enable, disable

and set the LED drive current in two groups: the

three 20mA outputs and the single 30mA output

with multiple level logarithmic scales. The AAT3132

has a thermal management system to protect the

device in the event of a short circuit condition at the

output pin. Built-in soft-start circuitry prevents

excessive inrush current during start-up. A high

charge pump switching frequency enables the use

of very small external capacitors. A low current

shutdown feature disconnects the load from VIN

and reduces quiescent current to less than 1µA.

The AAT3132 is available in very small 12 pin

TSOPJW12 package.

Features

ChargePump™

• VIN Range: 2.7 - 5.5 Volts

• < 1.0µA of Shutdown current

• 1.0 MHz Switching Frequency

• White LED Backlighting

• Fully Independent Display Lighting

• Drives Low-VF & High-VF Type LEDs

• Up to three 20mA Outputs

• Single 25 or 30mA Output

• Multi Position Logarithmic Scale with Digital

Control

• Low Noise Constant Frequency Operation

• Regulated Output Current

• Automatic Soft-Start

• No Inductors

• -40 to +85°C Temperature Range

• 12 pin TSOPJW-12 package

Applications

• White LED Backlighting

• White Photo-Flash for DSC's

• Color (RGB) Lighting

• Programmable Current Source

Typical Application

VBATTERY

CIN

COUT

1µF

1µF

EN/SET

VIN

C1+

VOUT

C1-

C2+

AAT3132

C2-

D1

D2

D3

D4

EN/SET

GND

C1

1µF

C2

1µF

D5

D4

D3

D2

D1

3132.2004.04.1.0

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