PRODUCT DATASHEET
AAT3105178
ChargePump
TM
General Description
The AAT3105 is a charge-pump based, current-source
white LED driver capable of driving one to four LEDs up
to 30mA, each. It automatically switches between 1x
mode and 2x mode to maintain the highest efficiency
and optimal LED current matching.
The AAT3105 charge pump’s 1x mode (bypass mode)
has very low resistance, allowing LED current regulation
to be maintained with input supply voltage approaching
the LED forward voltage.
LED brightness is controlled using a universal PWM inter-
face. The AAT3105 is available in a Pb-free, 2x2mm
10-lead SC70JW-10 package
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Features
•
•
•
•
•
•
•
•
•
•
•
Drives up to 4 LEDs at up to 30mA each
Automatic Switching Between 1x and 2x Modes
0.85MHz Switching Frequency
Linear LED Output Current Control
Universal PWM Interface
±10% LED Output Current Accuracy
±3% LED Output Current Matching
Low-current Shutdown Mode
Built-in Thermal Protection
Automatic Soft-start
Available in 2x2mm SC70JW-10 Package
Applications
•
•
•
•
Cell Phones
Digital Still Cameras
MP3 Players
Personal Data Assistants (PDAs)
Typical Application
IN
C+
C
IN
1µF
C
P
1µF
C-
EN/PWM
Interface
OUT
C
OUT
1µF
AAT3105
D1
D2
D3
EN/PWM
GND
D4
3105.2008.10.1.0
www.analogictech.com
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
