PRODUCT DATASHEET
AAT3193
ChargePump
TM
3-Channel Charge-Pump LED Driver
Features
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Drives up to 3 LEDs at up to 30mA, each
Automatic Switching Between 1x and 2x Modes
0.9MHz Switching Frequency
Linear LED Output Current Control
▪
Single-wire, S
2
Cwire Interface
• AAT3193-1: 16-step
• AAT3193-2: 8-step
• AAT3193-3: 4-step
▪
ON/OFF or PWM Interface
• AAT3193-4
±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
General Description
The AAT3193 is a charge-pump based, current-sink
white LED driver capable of driving one to three 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 AAT3193 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 AAT3193 is available in a 2x2mm, 10-lead SC70JW-10
package.
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Applications
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Entry
Entry
Entry
Entry
Level
Level
Level
Level
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+
OUT
C
P
1μF
AAT3193-1
C-
C
OUT
1μF
WLEDs
OSRAM LW M 678
or equivalent
EN/SET
S
2
Cwire
Interface
EN/SET
D1
D2
RSET
GND
D3
R
SET
14.3kΩ
3193.2008.07.1.3
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