PRODUCT DATASHEET
AAT3195
TM
ChargePump
4-Channel Charge-Pump LED Driver
General Description
Features
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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.
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
Single-wire, S2Cwire™ Interface
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AAT3195-1: 30mA, 32-step
AAT3195-2: 20mA, 32-step
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 RSET and is available in a thermally enhanced,
Pb-free 2x2.1mm 10-lead SC70JW-10 package.
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ON/OFF or PWM Interface
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AAT3195-3
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±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
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
WLEDs
OUT
IN
COUT
1µF
C+
CP
1µF
CIN
1µF
AAT3195
C-
D1
D2
D3
EN/SET
2
EN/SET
S Cwire
Interface
D4
GND
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