Datasheet > AAT1236IRN-T1

AAT1236IRN-T1

更新时间： 2024-02-23 04:08:47

品牌	Logo	应用领域
AAT		驱动器接口集成电路
页数	文件大小	规格书
24页	1012K
描述
High Efficiency White LED Drivers for Backlight and Keypad

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AAT1236IRN-T1 技术参数

生命周期：	Transferred	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.68
Base Number Matches：	1

AAT1236IRN-T1 数据手册

AAT1236

High Efficiency White LED Drivers

for Backlight and Keypad

™

SwitchReg

General Description

Features

The AAT1236 is a highly integrated, high efficiency

power solution for white LED and keypad backlights

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

boost converter which steps up the single cell lithi-

um-ion/polymer battery voltage to drive 5 strings of

series-connected white LEDs with precision current

regulation. The AAT1236 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

Two-Wire, I²C Compliant Serial Interface

— Two 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, 400kHz Serial Transfer Rate

Non-Pulsating, High-Performance LED Current

Drive for Uniform Illumination

•

A two-wire I²C serial digital interface is used to indi-

vidually turn each output sink on/off and adjust the

LED current by group. Unlike conventional pulse

width modulation (PWM) control of LED brightness,

the AAT1236 drives the LEDs with constant, non-

pulsating current. The interface is fully compliant to

the Fast/Standard mode I²C specification, allowing a

transfer rate of up to 400kHz.

— 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 a proprietary

Advanced Simple Serial Control™ (AS²Cwire™) sin-

gle wire interface; please see the AAT1235 datasheet.

Applications

•

Digital Still Cameras (DSCs)

Keypad Backlight

Large Panel Displays

Mobile Handsets

PDAs and Notebook PCs

Personal Media Players

White LED Backlight

The AAT1236 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

Keypad or

L=2.2µH

RGB LEDs

Up to 24V max

C_OUT

2.2µF

187kΩ

Backlight

LEDs

LIN

VIN

B1 B2

A1 A2 A3

Input :

2.7V~5.5V

AAT1236

12.1kΩ

C_IN

2.2µF

RSET GND AGND

EN SDA SCL

22.6kΩ

Enable

SDA

I²C

Interface

SCL

1236.2007.02.1.1

12 3 4 5 6 7...24

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