PRODUCT DATASHEET
AAT3128
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 S
2
Cwire 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.
RGB LED Fashion Lighting Controller
Features
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2.7V to 5.5V Input Voltage Range
Compatible with Common Anode RGB LEDs
Four S
2
Cwire 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
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Color Backlighting for Monochrome LCD Displays
Color Display Lighting
Fashion Lighting RGB LEDs
Mobile Handsets
MP3 Players
PDAs
Smart Phones
Typical Application
IN
CP
V
BATTERY
C
IN
1μF
C
OUT
1μF
ISRC2
ISRC1
C1+
C1-
C2+
EN/SET
RSET
R
SET
38.3kΩ
GND
C2-
DR
DG
DB
AAT3128
C1
1μF
R
C1
1μF
G
B
RGB
LED 1
R
G
B
RGB
LED 2
EN/SET
3128.2008.02.1.1
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