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| AAT3105 Datasheet, PDF (1/15 Pages) Advanced Analogic Technologies – Low Cost 1x/2x 4 Channel Charge Pump WLED Driver | |||
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ChargePumpTM
PRODUCT DATASHEET
AAT3105178
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
General Description
The AAT3105 is a charge-pump based, current-source
white LED driver capable of driving one to four LEDs up
to 30mA, each. It automatically switches between 1x
mode and 2x mode to maintain the highest efficiency
and optimal LED current matching.
The AAT3105 charge pumpâs 1x mode (bypass mode)
has very low resistance, allowing LED current regulation
to be maintained with input supply voltage approaching
the LED forward voltage.
LED brightness is controlled using a universal PWM inter-
face. The AAT3105 is available in a Pb-free, 2x2mm
10-lead SC70JW-10 package
Features
⢠Drives up to 4 LEDs at up to 30mA each
⢠Automatic Switching Between 1x and 2x Modes
⢠0.85MHz Switching Frequency
⢠Linear LED Output Current Control
⢠Universal PWM Interface
⢠±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
⢠Cell Phones
⢠Digital Still Cameras
⢠MP3 Players
⢠Personal Data Assistants (PDAs)
Typical Application
IN
OUT
C+
CIN
1µF
CP
1µF
AAT3105
D1
C-
D2
EN/PWM
Interface
D3
EN/PWM
D4
GND
C OUT
1µF
3105.2008.10.1.0
www.analogictech.com
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