AAT3192_08 Datasheet, PDF (1/18 Pages) Advanced Analogic Technologies – 2-Channel Charge-Pump LED Driver

ChargePump^TM
General Description
The AAT3192 is a charge-pump based, current-sink
white LED driver capable of driving one or two 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 AAT3192 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 AAT3192 is available in the 2x2mm, 10-lead SC70JW-
10 package.
PRODUCT DATASHEET
AAT3192
2-Channel Charge-Pump LED Driver
Features
• Drives up to 2 LEDs at up to 30mA, each
• Automatic Switching Between 1x and 2x Modes
• 0.9MHz Switching Frequency
• Linear LED Output Current Control
▪ Single-wire, S²Cwire Interface
• AAT3192-1: 16-step
• AAT3192-2: 8-step
• AAT3192-3: 4-step
▪ ON/OFF or PWM Interface
• AAT3192-4
• ±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
• Entry Level Cordless Phone Handsets
• Entry Level Digital Cameras
• Entry Level Mobile Phone Handsets
• Entry Level MP3 and PMP Players
Typical Application
Input Voltage
2.7V to 5.5V
C_IN
1μF
C_P
1μF
EN/SET
S²Cwire
Interface
R_SET
14.3kΩ
IN
OUT
C+
AAT3192-1
C-
EN/SET
D1
RSET
D2
GND
C_OUT
1μF
WLEDs
OSRAM LW M 678
or equivalent
3192.2008.07.1.3
www.analogictech.com
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