AAT3104 Datasheet, PDF (1/15 Pages) Advanced Analogic Technologies – Low Cost 1x/2x 4 Channel Charge Pump WLED Driver

ChargePump^TM
PRODUCT DATASHEET
AAT3104178
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
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 S²Cwire™ single wire interface. The AAT3104 is
available in a 2x2mm 10-lead SC70JW-10 package.
Features
• 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, S²_{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
Applications
• Cordless Phone Handsets
• Digital Cameras
• Mobile Phone Handsets
• MP3 and PMP Players
Typical Application
Input Voltage
2.7V to 5.5V
IN
OUT
C+
C_IN
1µF
C_P
1µF
AAT3104
D1
C-
D2
EN/SET
S²Cwire
Interface
D3
EN/SET
D4
GND
C_OUT
1µF
3104.2008.09.1.0
www.analogictech.com
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