AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
General Description
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.
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.
The AAT3192 and the AAT3193 are available in a
2x2mm 10-lead SC70JW-10 packages.
Features
•
•
•
•
ChargePump
™
•
•
•
•
•
•
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
• AAT3192/93-1: 16-step
• AAT3192/93-2: 8-step
• AAT3192/93-3: 4-step
— ON/OFF or PWM Interface
• AAT3192/93-4
±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
•
•
•
•
Low-cost
Low-cost
Low-cost
Low-cost
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
Input Voltage
2.7V to 5.5V
C
IN
1μF
IN
C+
OUT
C
P
1μF
AAT3192-1
C-
EN/SET
RSET
GND
D1
D2
C
OUT
1μF
C
P
1μF
AAT3193-1
C-
C
OUT
1μF
WLEDs
OSRAM LW M 678
or equivalent
EN/SET
S
2
Cwire
Interface
R
SET
14.3kΩ
WLEDs
OSRAM LW M 678
or equivalent
EN/SET
S
2
Cwire
Interface
EN/SET
D1
D2
RSET
GND
D3
R
SET
14.3kΩ
3193.2007.05.1.0
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
