AAT2833/34
240mA Total Display Solution
for Portable Devices
General Description
The AAT2833/34 is a total solution IC for portable
display applications. Based on a tri-mode charge
pump power engine, it is capable of delivering
240mA of output current for white LED (WLED)
backlight and RGB applications. The high conver-
sion efficiency and high level of integration make the
AAT2833/34 an optimal solution for battery life and
size-critical applications.
AnalogicTech's AS
2
Cwire™ (Advanced Simple
Serial Control™) serial digital interface is used to
enable, disable, and set current levels for all of the
light emitting diodes (LEDs). Each backlight chan-
nel can be programmed to 16 levels of current, from
a recommended maximum of 30mA programmed by
the R
BSET
resistor. The RGB module can be adjust-
ed to 8 levels of current, up to a recommended max-
imum of 60mA. The RGB module is programmable
with up to 4096 (AAT2833) or 64 (AAT2834)
color/intensity (brightness) combinations.
The AAT2833/34 is offered in a Pb-free, thermally
enhanced 24-pin 4x4x0.75mm TQFN package.
Features
•
•
ChargePump
™
•
•
Applications
•
•
•
•
•
Digital Still Cameras
LCD Display Modules
MP3 Players
White LED Drivers
Wireless Handsets
•
•
•
•
•
Input Supply Voltage Range: 2.7V to 5.5V
Tri-Mode (1X/1.5X/2X) Charge Pump:
— Delivers up to 240mA of Output Current
— Switching Frequency: Up to 2MHz
Total Display Solution for RGB and Backlight
Applications
— 6-Channel Backlight WLED Backlight
• User-Programmable Full-Scale Current,
up to 30mA
— 3-Channel RGB
• User-Programmable Full-Scale Output
Current/Duty Cycle
• AAT2833: 4096 Color/Intensity
Combinations
• AAT2834: 64 Color/Intensity
Combinations
Single-Wire AS
2
Cwire Serial Interface for
Configuration/Control
— Eleven Addressable Registers
— Fast, 1MHz Serial Interface
True Load Disconnect in Shutdown, I
IN
< 1µA
Built-in Thermal Protection
Built-in Auto-Disable for Open LED Condition
Automatic Soft-Start Minimizes Inrush Current
Available in 4x4x0.75mm TQFN44-24 Package
Typical Application
C
OUT
2.2μF
RGB LED
OUT BL1
IN
EN/SET
BL2 BL3 BL4 BL5 BL 6
R G B
BSET
PGND
AGND
AAT2833/34
C1+ C1- C2+ C2-
V
BATTERY
Single-cell Li+
C
IN
2.2μF
AS
2
Cwire
Serial Control
R
BSET
280kΩ
C1
1μF
C2
1μF
2833.2007.09.1.0
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
