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AAT3129 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc.

Part No. AAT3129
Description  High Efficiency 1X/1.5X/2X Charge Pump for RGB Color LED Applications
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Maker  AAT [Advanced Analog Technology, Inc.]
Homepage  http://www.aatech.com.tw
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AAT3129 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc.

 
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AAT3129
High Efficiency 1X/1.5X/2X Charge Pump
for RGB Color LED Applications
3129.2007.01.1.4
1
ChargePump
General Description
The AAT3129 is a high efficiency charge pump
DC/DC converter with tri-mode load switch (1X)
fractional (1.5X) and doubling (2X) conversion for
color LED applications. A single current source out-
put provides a regulated current to drive R, G, and
B LEDs via three internal switches. With a simple
single wire serial bus, the RGB module can be eas-
ily controlled to display 4096 colors.
AnalogicTech's Advanced Simple Serial Control™
(AS2Cwire™) serial digital input is used to enable,
disable, and set the duty cycle of each internal
MOSFET switch. Low external parts count (two
1μF flying capacitors and two small bypass capac-
itors at VIN and OUT) makes the AAT3129 ideally
suited for small battery-powered applications.
The AAT3129 has a thermal management system
to protect the device in the event of a short-circuit
condition on any of the output pins. Built-in soft-
start circuitry prevents excessive inrush current
during start-up. High switching frequency enables
the use of small external capacitors. A low current
shutdown feature disconnects the load from VIN
and reduces quiescent current to less than 1μA.
The AAT3129 is available in a Pb-free, 12-pin
TSOPJW package.
Features
•VIN Range: 2.7V to 5.5V
Common Anode RGB LED Control
4096 Color with Single Wire Digital Control
40mA to 180mA Fixed Current Source
•AS2Cwire Digital Brightness Control
Low Noise Constant Frequency Operation
Small Application Circuit
Regulated Output Current
No Inductors
1MHz Switching Frequency
•IQ <1μA in Shutdown
12-Pin TSOPJW Package
Applications
Fashion RGBs
Mobile Handsets
MP3 Players
PDAs
Portable Devices
RGB Color LEDs
RGB Photo Flash
Smart Phones
Typical Application
C
IN
1
μF
V
BAT
C
CP
1
μF
C1
1
μF
C2
1
μF
VIN
CP
C1+
C1-
C2+
C2-
DR
DG
DB
EN/SET
EN/SET
GND
AAT3129
G
R
B
ISRC


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