AAT3128_08 Datasheet, PDF (1/12 Pages) Advanced Analogic Technologies – RGB LED Fashion Lighting Controller

ChargePump^TM
General Description
The AAT3128 is a total solution controller for RGB LED
fashion lighting. A simplified control scheme greatly reduc-
es design complexity and accelerates time to market.
The AAT3128 contains a high efficiency tri-mode charge
pump DC/DC converter with 1X, 1.5X and 2X modes for
color LED applications. Current source outputs drive two
individual RGB LEDs for color displays, fashion and mood
lighting. With a single-wire S²Cwire interface, an RGB
LED module is easily controlled to display four distinct
lighting mood effects.
Low external parts count (two 1μF flying capacitors and
two small bypass capacitors) and high conversion effi-
ciency make the AAT3128 ideally suited for small bat-
tery-powered portable applications.
The AAT3128 has a thermal management system to pro-
tect the device in the event of an output short circuit
condition. Built-in soft-start circuitry prevents excessive
inrush current during start-up. A low current shutdown
feature disconnects the load from the input source and
reduces quiescent current to less than 1μA.
The AAT3128 is available in a 14-pin TSOPJW package.
PRODUCT DATASHEET
AAT3128
RGB LED Fashion Lighting Controller
Features
• 2.7V to 5.5V Input Voltage Range
• Compatible with Common Anode RGB LEDs
• Four S²Cwire Controlled Lighting Moods
• 0~60mA Programmable Current Source
• Low Noise Constant Frequency Operation
• No Inductors
• Small Application Circuit
• Regulated Output Current
• Integrated LED Control Switches
• Automatic Soft-Start
• Less than 1μA Shutdown Current
Applications
• Color Backlighting for Monochrome LCD Displays
• Color Display Lighting
• Fashion Lighting RGB LEDs
• Mobile Handsets
• MP3 Players
• PDAs
• Smart Phones
Typical Application
V_BATTERY
IN
ISRC2
ISRC1
CP
C1+
C_IN
1μF
C_{OUT AAT3128}
1μF
C1-
C2+
EN/SET
R_SET
38.3kΩ
EN/SET ^C2-
DR
RSET
DG
GND ^DB
C1
1μF
RGB
RGB
C1
1μF
RGB
LED 1
RGB
LED 2
3128.2008.02.1.1
www.analogictech.com
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