AAT3128 Datasheet, PDF (1/13 Pages) Advanced Analogic Technologies – RGB LED Fashion Lighting Controller

AAT3128
RGB LED Fashion Lighting Controller
General Description
Features
ChargePump^™
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 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 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.
• 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
3128.2007.09.1.0
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