AAT1235 Analogic Corporation, AAT1235 Datasheet

AAT1235

Manufacturer Part Number

AAT1235

Description

Manufacturer

Analogic Corporation

Datasheet

1.AAT1235.pdf (21 pages)

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General Description

The AAT1235 is a highly integrated, high efficiency

power solution for white LED backlight and keypad

backlights in mobile/portable devices. It is based on a

switching boost converter which steps up the single-

cell lithium-ion/polymer battery voltage to drive 5

strings of series-connected white LEDs with preci-

sion current regulation. The AAT1235 is capable of

driving a total of four LEDs per channel.

The boost converter can produce an output drive of

up to 24V at 100mA. The high switching frequency

(up to 2MHz) provides fast response to load tran-

sients and allows the use of small external compo-

nents. A fully integrated control circuit simplifies the

design and reduces total solution size.

AnalogicTech's Advanced Simple Serial Control™

(AS

ly turn each output sink on/off and adjust the LED

current by group. Unlike conventional pulse width

modulation (PWM) control of LED brightness, the

AAT1235 drives the LEDs with constant, non-pulsat-

ing current.

A similar device is also available with an I

wire interface; please see the AAT1236 datasheet.

The AAT1235 is available in a Pb-free, thermally-

enhanced 16-pin 3x4mm TDFN package and is

specified for operation over the -40°C to +85°C tem-

perature range.

Typical Application

1235.2007.01.1.0

Cwire™) serial digital input is used to individual-

2.7V~5.5V

Input :

2.2µF

Cwire Control

VIN

LIN

= 2.2µH

EN/SET

C two-

2.2µF

OUT

Backlight

LEDs

AAT1235

22.6kΩ

B 1

RSET

Up to 24V Max

High Efficiency White LED Drivers

B 2

Features

•

Applications

•

A 1

GND

Input Supply Voltage Range: 2.7V to 5.5V

Maximum Boost Output Drive: Up to 24V at 100mA

Up to 85% Efficient Operation

Up to 2MHz Switching Frequency with Small

Inductor

User-Programmable Full-Scale LED Current, Up

to 30mA

Single-Wire AS

— Five Addressable Registers

— Fast, 1MHz Serial Interface

Non-Pulsating, High-Performance LED Current

Drive for Uniform Illumination

— 10% Absolute Accuracy

— 2% Channel-to-Channel Matching

Over-Voltage and Over-Temperature Protection

Automatic Soft-Start Minimizes Large Inrush

Current at Startup

Available in 3x4mm TDFN34-16 Package

Digital Still Cameras (DSCs)

Keypad Backlight

Large Panel Displays

Mobile Handsets

Personal Media Players

PDAs and Notebook PCs

White LED Backlight

A 2

•

AGND

A 3

Independent LED Current Control by Group

— Backlight Group B1-B2, 16 Settings

— Auxiliary Group A1-A3, 16 Settings

Independent LED ON/OFF Control

for Backlight and Keypad

Keypad or

RGB LEDs

187kΩ

12.1kΩ

Cwire Serial Interface

SwitchReg

™

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