AAT3113ITP データシートの表示（PDF） - Analog Technology Inc

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AAT3113ITP

High Efficiency 1.5X Fractional Charge Pumps For White LED Applications

Analog Technology Inc 

PRODUCT DATASHEET

AAT3113, AAT3114/14A

ChargePumpTM High Efficiency 1.5X Fractional Charge Pumps For White LED Applications

General Description

The AAT3113 and AAT3114/14A are low noise, constant

frequency charge pump DC/DC converters that use frac-

tional (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. A low external parts count (two 1µF flying

capacitors and two small bypass capacitors at VIN and

OUT) makes these devices ideally suited for small, bat-

tery-powered applications.

AnalogicTech’s Simple Serial Control™ (S2Cwire™) inter-

face is used to enable, disable, and set the LED drive

current for 32-level logarithmic scale LED brightness

control. AAT3113 and AAT3114/14A devices have a ther-

mal management system for protection in the event of a

short-circuit condition on any of the output pins. Built-in

soft-start circuitry prevents excessive inrush current

during start-up. A high switching frequency enables the

use of small external capacitors. A low-current shutdown

feature disconnects the load from VIN and reduces quies-

cent current to less than 1µA. The AAT3113 provides

four LED current source outputs, and the AAT3114/14A

provides six. The AAT3113 is available in a Pb-free

12-pin TSOPJW package, and the AAT3114/14A is avail-

able in a Pb-free 16-pin QFN package.

Features

• AAT3113: Four Outputs

• AAT3114/14A: Six Outputs

• 20mA Full-Scale Current

• Simple Serial Control (S2Cwire) Interface

▪ 32-Position Logarithmic Scale with Digital Control

• Low Noise Constant Frequency Operation

• 33% Less Input Current Than Doubler Charge Pump

• High Accuracy Brightness Matching

• Small Application Circuit

• Regulated Output Current

• Automatic Soft Start

• VIN Range: 2.7V to 5.5V

• No Inductors

• 600kHz Switching Frequency

• IQ <1µA in Shutdown

• Temperature Range: -40°C to 85°C

• 12-Pin TSOPJW Package (AAT3113)

• 16-Pin QFN Package (AAT3114/14A)

Applications

• Programmable Current Source

• White LED Backlighting

Typical Application

VBATTERY

CIN

COUT

1µF

1µF

EN/SET

VIN

C1+

OUT

C1-

C2+

AAT3113

C2-

D1

D2

D3

D4

EN/SET

GND

C1

1µF

C2

1µF

VBATTERY

D4

D3

D2

D1

CIN

COUT

1µF

1µF

EN/SET

VIN

C1+

OUT

C1-

C2+

AAT3114/14A

C2-

D1

D2

D3

D4

EN/SET

D5

D6

GND

C1

1µF

C2

1µF

D6

D5

D4

D3

D2

D1

3113.2008.05.1.10

www.analogictech.com

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