PRODUCT DATASHEET
AAT3104178
ChargePump
TM
General Description
The AAT3104 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 accuracy and matching.
The AAT3104 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 AnalogicTech’s pat-
ented S
2
Cwire™ single wire interface. The AAT3104 is
available in a 2x2mm 10-lead SC70JW-10 package.
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Features
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Drives up to 4 LEDs at up to 31mA each
Automatic Switching Between 1x and 2x Modes
1MHz Switching Frequency
Linear LED Output Current Control
Single-wire, S
2
Cwire Interface
AAT3104-1: 16-step
AAT3104-2: 32-step
±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
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Applications
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Cordless Phone Handsets
Digital Cameras
Mobile Phone Handsets
MP3 and PMP Players
Typical Application
Input Voltage
2.7V to 5.5V
C
IN
1µF
IN
C+
C
P
1µF
C-
EN/SET
S
2
Cwire
Interface
OUT
C
OUT
1µF
AAT3104
D1
D2
D3
EN/SET
GND
D4
3104.2008.09.1.0
www.analogictech.com
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