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AAT1236 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc.

Part No. AAT1236
Description  High Efficiency White LED Drivers for Backlight and Keypad
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Maker  AAT [Advanced Analog Technology, Inc.]
Homepage  http://www.aatech.com.tw
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AAT1236 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc.

 
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AAT1236
High Efficiency White LED Drivers
for Backlight and Keypad
1236.2007.02.1.1
1
SwitchReg
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 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.
A similar device is also available with a proprietary
Advanced Simple Serial Control™ (AS2Cwire™) sin-
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.
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
• Two-Wire, I2C Compliant Serial Interface
— Two Addressable Registers
• 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
— 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
Applications
Digital Still Cameras (DSCs)
Keypad Backlight
Large Panel Displays
Mobile Handsets
PDAs and Notebook PCs
Personal Media Players
White LED Backlight
Typical Application
EN
AGND
VIN
L=2.2µH
D1
C
2.2µF
IN
C
R2
187k
Ω
R3
12.1k
Ω
R1
22.6k
Ω
OUT
2.2µF
Input :
2.7V~5.5V
AAT1236
SW
B1
Up to 24V max
GND
RSET
B2
A1
A2
A3
Enable
OV
Backlight
LEDs
Keypad or
RGB LEDs
LIN
IN
SDA
SCL
SDA SCL
I2C
Interface


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