AAT3128
RGB LED Fashion Lighting Controller
General Description
The AAT3128 is a total solution controller for RGB
LED fashion lighting. A simplified control scheme
greatly reduces 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 conver-
sion efficiency make the AAT3128 ideally suited for
small battery-powered portable applications.
The AAT3128 has a thermal management system
to protect 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 cur-
rent 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.
Features
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ChargePump
™
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
3128.2007.09.1.0
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
