AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
™
ChargePump
General Description
Features
The AAT3192 and AAT3193 are charge-pump
based, current-sink white LED drivers capable of
driving one to three LEDs up to 30mA, each. They
automatically switch between 1x mode and 2x
mode to maintain the highest efficiency and opti-
mal LED current accuracy and matching.
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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
2
— Single-wire, S Cwire Interface
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AAT3192/93-1: 16-step
AAT3192/93-2: 8-step
AAT3192/93-3: 4-step
The AAT3192/93 charge pump’s 1x mode (bypass
mode) has very low resistance allowing LED cur-
rent regulation to be maintained with input supply
voltage approaching the LED forward voltage.
— ON/OFF or PWM Interface
AAT3192/93-4
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10ꢀ LED Output Current Accuracy
3ꢀ LED Output Current Matching
Low-current Shutdown Mode
Built-in Thermal Protection
The AAT3192 and the AAT3193 are available in a
2x2mm 10-lead SC70JW-10 packages.
Automatic Soft-start
Available in 2x2mm SC70JW-10 Package
Applications
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Low-cost Cordless Phone Handsets
Low-cost Digital Cameras
Low-cost Mobile Phone Handsets
Low-cost MP3 and PMP Players
Typical Application
Input Voltage
2.7V to 5.5V
Input Voltage
IN
IN
2.7V to 5.5V
C+
OUT
OUT
C+
CIN
1μF
COUT
1μF
CIN
1μF
CP
COUT
1μF
AAT3193-1
1μF
CP
1μF
WLEDs
AAT3192-1
C-
WLEDs
OSRAM LW M 678
or equivalent
C-
OSRAM LW M 678
or equivalent
EN/SET
S2Cwire
Interface
EN/SET
S2Cwire
Interface
EN/SET
D1
D2
D3
EN/SET
D1
D2
RSET
RSET
GND
GND
RSET
14.3kΩ
RSET
14.3kΩ
3193.2007.05.1.0
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