AAT1236 Analogic Corporation, AAT1236 Datasheet

AAT1236

Manufacturer Part Number

AAT1236

Description

Manufacturer

Analogic Corporation

Datasheet

1.AAT1236.pdf (24 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AAT1236IRN-T1

Manufacturer:

ANALOGIC

Quantity:

1 000

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General Description

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.

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.

A two-wire I

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 I

transfer rate of up to 400kHz.

A similar device is also available with a proprietary

Advanced Simple Serial Control™ (AS

gle wire interface; please see the AAT1235 datasheet.

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

1236.2007.01.1.0

C serial digital interface is used to indi-

C specification, allowing a

Interface

2.7V~5.5V

Input :

2.2µF

Enable

SDA

SCL

Cwire™) sin-

VIN

LIN

L=2.2µH

2.2µF

SDA SCL

OUT

Backlight

LEDs

AAT1236

22.6kΩ

High Efficiency White LED Drivers

B 1

Features

•

Applications

•

RSET

B 2

Up to 24V max

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, I

— Two Addressable Registers

— Fast, 400kHz Serial Transfer Rate

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

PDAs and Notebook PCs

Personal Media Players

White LED Backlight

A 1

•

GND

A 2

Independent LED Current Control by Group

— Backlight Group B1-B2, 16 Settings

— Auxiliary Group A1-A3, 16 Settings

Independent LED ON/OFF Control

AGND

for Backlight and Keypad

A 3

C Compliant Serial Interface

Keypad or

RGB LEDs

187kΩ

12.1kΩ

SwitchReg

™

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