PRODUCT DATASHEET
AAT3195
ChargePump
TM
4-Channel Charge-Pump LED Driver
Features
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Drives up to 4 LEDs at up to 30mA, each
Automatic Switching Between 1x and 2x Modes
1MHz Switching Frequency
Linear LED Output Current Control
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Single-wire, S
2
Cwire™ Interface
• AAT3195-1: 30mA, 32-step
• AAT3195-2: 20mA, 32-step
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ON/OFF or PWM Interface
• AAT3195-3
±10% LED Output Current Accuracy
3% LED Output Current Matching
Low-current Shutdown Mode
Built-in Thermal Protection
Automatic Soft-start
2x2.1mm SC70JW-10 Package
General Description
The AAT3195 is a charge-pump based, current-sink
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 AAT3195 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. The AAT3195 incorporates an
internal R
SET
and is available in a thermally enhanced,
Pb-free 2x2.1mm 10-lead 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
IN
OUT
WLEDs
C
IN
1µF
C
P
1µF
C+
C
OUT
1µF
AAT3195
C-
D1
D2
EN/SET
S
2
Cwire
Interface
EN/SET
GND
D3
D4
3195.2008.09.1.0
www.analogictech.com
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AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
