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AAT1235

Features: `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 Cwire Serial Interface-aFive Addressable Register`...

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SeekIC No. : 004261045 Detail

AAT1235: Features: `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 ...

AAT1235 Data Sheet

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Part Number:
AAT1235
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

`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 Cwire Serial Interface
-aFive Addressable Register
`Independent LED Current Control by Group
-aBacklight Group B1-B2, 16 Setting
-aAuxiliary Group A1-A3, 16 Setting
`Independent LED ON/OFF Control
-aFast, 1MHz Serial Interfac
`Non-Pulsating, High-Performance LED Current Drive for Uniform Illumination
-a10% Absolute Accurac
-a2% Channel-to-Channel Matchin
`Over-Voltage and Over-Temperature Protection
`Automatic Soft-Start Minimizes Large Inrush Current at Startup
`Available in 3x4mm TDFN34-16 Package

 




Application

·Digital Still Cameras (DSCs)
·Keypad Backlight
·Large Panel Displays
·Mobile Handsets
·Personal Media Players
·PDAs and Notebook PCs
·White LED Backlight


Specifications

Symbol
Description
Value
Units
VIN, IN SW
 Input Voltage
-0.3 to 6.0
V
EN/SET, Bx, Ax,
Switching Node
28
V
RSET, OV, LIN
 Maximum Rating
VIN + 0.3
V
TS
 Storage Temperature Range
-65 to 150
TJ
 Operating Temperature Range
-40 to 150
TLEAD
 Maximum Soldering Temperature (at leads, 10 sec)
300



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.

Afully integrated control circuit simplifies the design and reduces total solution size. AnalogicTech's Advanced Simple Serial Control? 2 (AS Cwire?) 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. 2 Asimilar device is also available with an I C two- 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!aC to +85!aC te perature range.




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