AAT3142ITP-T1 데이터 시트보기 (PDF) - Advanced Analogic Technologies

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AAT3142ITP-T1

High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

Advanced Analogic Technologies 

AAT3142

High Efficiency 1X/1.5X/2X Charge Pump

for White LED Applications

General Description

The AAT3142 is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-

mode load switch (1X), fractional (1.5X), and dou-

bling (2X) conversion to maximize efficiency for

white LED applications. The device produces cur-

rent levels up to 30mA on each of its three current

source outputs to drive various arrangements of

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

operated individually or in parallel for driving high-

er-current LEDs. A low external parts count (two

1µF flying capacitors and two small 1µF capacitors

at VIN and CP) make the AAT3142 ideally suited for

small battery-powered applications.

AnalogicTech's Simple Serial Control™ (S2Cwire™)

digital input is used to enable, disable, and set the

LED drive current with a 32-level logarithmic scale

LED brightness control. The AAT3142 has a thermal

management system to protect the device in the

event of a short-circuit condition at an output pin.

Built-in soft-start circuitry prevents excessive inrush

current during start-up. A high charge pump switch-

ing frequency enables the use of very small external

capacitors. In shutdown mode, the device discon-

nects the load from VIN and reduces quiescent cur-

rent to less than 1µA. The AAT3142 is available in

the very small, Pb-free 12-pin TSOPJW package.

Features

ChargePump™

• VIN Range: 2.7V to 5.5V

• Tri-Mode 1X, 1.5X, and 2X Charge Pump for

Maximum Efficiency and VF Coverage

• Drives Low-VF and High-VF Type LEDs

• Up to Three 30mA Outputs

• 32-Position Logarithmic Scale with Digital

Control

• Low Noise Constant Frequency Operation

• 1MHz Switching Frequency

• Small Application Circuit

• Regulated Output Current

• Automatic Soft Start

• No Inductors

• IQ < 1µA in Shutdown

• 12-Pin TSOPJW Package

Applications

• Color (RGB) Lighting

• Programmable Current Sources

• White LED Backlighting

• White Photo Flash for Digital Still Cameras

Typical Application

VBATTERY

CIN

CCP

1µF

1µF

EN/SET

VIN

C1+

CP

C1-

C2+

AAT3142

C2-

D1

D2

D3

EN/SET

GND

C1

1µF

C2

1µF

D3

D2

D1

3142.2005.12.1.1

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