AAT2830/31
800mA Total Display Solution
for Portable Devices
General Description
The AAT2830/31 is a total solution IC for portable dis-
play applications. Based on a tri-mode charge pump
power engine, it is capable of delivering 800mA of
output current with individual driving circuitries for
light emitting diode (LED) backlights, photo flash, and
RGB. The high conversion efficiency and high level
of integration make the AAT2830/31 the optimum
solution for battery life and size-critical applications.
AnalogicTech's AS
2
Cwire™ (Advanced Simple Serial
Control™) serial digital input is used to enable, dis-
able, and set current for all of the outputs. Each back-
light LED output can be programmed to 30mA over 16
discrete steps. The AAT2830/31 can also deliver up to
600mA to drive flash LEDs over four individual chan-
nels, with excellent current matching between chan-
nels. A built-in safety timer function allows easy, one-
trigger system control for photo flash applications.
The RGB output can be adjusted to handle up to
60mA, and the AS
2
Cwire signal can drive the RGB
module in up to 4096 (AAT2830) or 64 (AAT2831)
color intensity combinations.
The AAT2830/31 is available in a Pb-free, thermal-
ly-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 800mA 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
— 4-Channel Flash WLED Drive
• User-Programmable Full-Scale Current,
up to 150mA
• Torch/Flashlight/Movie Mode Operation
• Auto-/Safety Flash Timer
— 3-Channel RGB
• User-Programmable Full-Scale Output
Current/Duty Cycle
• AAT2830: 4096 Color/Intensity
Combinations
• AAT2831: 64 Color/Intensity
Combinations
Single-Wire AS
2
Cwire Serial Interface for
Configuration/Control
— Fourteen 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 FL1 FL2 FL3 FL4
IN
V
BATTERY
Single-Cell Li+
EN/SET
C1+ C1- C2+ C2-
BL1…BL4 BL5 BL6
R G B
BSET
CT
AAT2830 / 31
PGND
C
IN
4.7μF
AGND
C
T
0.1μF
R
SET
280kΩ
AS
2
Cwire
Serial Control
C1
1μF
C2
1μF
2830.2007.09.1.0
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
