Datasheet > AAT1235

AAT1235

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		驱动器
页数	文件大小	规格书
21页	958K
描述
High Efficiency White LED Drivers for Backlight and Keypad

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AAT1235 数据手册

AAT1235

High Efficiency White LED Drivers

for Backlight and Keypad

™

SwitchReg

General Description

Features

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.

•

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 AS²Cwire Serial Interface

— Five Addressable Registers

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.

•

Independent LED Current Control by Group

— Backlight Group B1-B2, 16 Settings

— Auxiliary Group A1-A3, 16 Settings

Independent LED ON/OFF Control

•

— Fast, 1MHz Serial Interface

Non-Pulsating, High-Performance LED Current

Drive for Uniform Illumination

•

AnalogicTech's Advanced Simple Serial Control™

(AS²Cwire™) serial digital input is used to individual-

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.

— 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

A similar device is also available with an I²C two-

wire interface; please see the AAT1236 datasheet.

Applications

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.

•

Digital Still Cameras (DSCs)

Keypad Backlight

Large Panel Displays

Mobile Handsets

Personal Media Players

PDAs and Notebook PCs

White LED Backlight

Typical Application

Keypad or

RGB LEDs

L= 2.2µH

Up to 24V Max

C_OUT

2.2µF

Backlight

LEDs

187kΩ

LIN

B1 B2

A1 A2 A3

Input :

2.7V~5.5V

VIN

AAT1235

C_IN

12.1kΩ

2.2µF

EN/SET

AGND

RSET GND

22.6kΩ

AS²Cwire Control

1235.2007.02.1.1

12 3 4 5 6 7...21

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