AAT3152_05 ANALOGICTECH [Advanced Analogic Technologies], AAT3152_05 Datasheet

AAT3152_05

Manufacturer Part Number

AAT3152_05

Description

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

Manufacturer

ANALOGICTECH [Advanced Analogic Technologies]

Datasheet

1.AAT3152_05.pdf (12 pages)

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General Description

The AAT3152 is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-mode

load switch (1X), fractional (1.5X), and doubling (2X)

conversion to maximize efficiency for white LED

applications. The AAT3152 is capable of driving

four-channel LEDs from a 2.7V to 5.5V input. The

current sinks may be operated individually or in par-

allel for driving higher-current LEDs. A low external

parts count (two 1µF flying capacitors and two small

1µF capacitors at V

ally suited for small, battery-powered applications.

AnalogicTech's S

serial digital input is used to enable, disable, and

set current for each LED with eight settings (20mA

down to 50µA) including main/sub-display group

control. The AAT3152 consumes extremely low cur-

rent internally (50µA typical) at light load for opti-

mized efficiency.

Each output of the AAT3152 is equipped with built-

in protection for V

for load short-circuit conditions. Built-in soft-start

circuitry prevents excessive inrush current during

start-up. A low current shutdown feature discon-

nects the load from V

rent to less than 1µA.

The AAT3152 is available in a Pb-free, space-sav-

ing, thermally-enhanced 12-pin 3x3mm TDFN

package.

Typical Application

3152.2005.08.1.2

Cwire™ (Simple Serial Control™)

OUT

and V

short-circuit and auto-disable

2.7V to 5.5V

and reduces quiescent cur-

EN/SET

OUT

) makes this part ide-

1µF

VIN

EN/SET

AAT3152

GND

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

VOUT

C1+

C2+

C1-

C2-

Features

•

Applications

•

1µF

Fully Programmable Current with Single Wire

— Eight-Step Current: 20mA to 50µA

— Individual Main-Sub Group Control

— Low I

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

Maximum Efficiency and V

Drives 1-4 Channels of LEDs

No Inductors, Low Noise Operation

1MHz Constant Switching Frequency

Small Application Circuit

Built-In Thermal Protection

Built-In Auto-Disable for Short-Circuit

Automatic Soft Start

Thermally-Enhanced 3x3mm 12-Pin TDFN

Package

Color (RGB) Lighting

Programmable Current Sinks

White LED Backlighting

White Photo Flash for Digital Still Cameras

<1µA in Shutdown

Range: 2.7V to 5.5V

For White LED Applications

(50µA) at Light Load

ChargePump

1µF

OUT

Coverage

AAT3152

™

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