AAT3192 Datasheet, PDF (1/17 Pages) Advanced Analogic Technologies – 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.
AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
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, S²Cwire 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
Typical Application
Applications
• Low-cost Cordless Phone Handsets
• Low-cost Digital Cameras
• Low-cost Mobile Phone Handsets
• Low-cost MP3 and PMP Players
Input Voltage
2.7V to 5.5V
CIN
1μF
CP
1μF
EN/SET
S²Cwire
Interface
RSET
14.3kΩ
IN
OUT
C+
AAT 3192- 1
C-
EN/SET
D1
RSET
D2
GND
C OUT
1μF
Input Voltage
2.7V to 5.5V
WLEDs
OSRAM LW M 678
or equivalent
C IN
1μF
CP
1μF
EN/SET
S2Cwire
Interface
R SET
14.3kΩ
IN
C+
OUT
AAT 3193 -1
C-
EN/SET
D1
D2
RSET
D3
GND
COUT
1μF
WLEDs
OSRAM LW M 678
or equivalent
3193.2007.05.1.0
1