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器件描述：High Efficiency 1X/1.5X/2X Charge Pump for RGB Color LED Applications
器件厂商：ANALOGICTECH [Advanced Analogic Technologies]
厂商主页：http://www.analogictech.com/
文件大小：302.66KB
文件页数：14
PDF阅读：AAT3129ITP-60-T1.pdf (点击阅读器件资料)
摘要：
AAT3129
High Efficiency 1X/1.5X/2X Charge Pump
for RGB Color LED Applications
3129.2005.11.1.3 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?
(AS
2
Cwire?) serial digital input is used to enable,
disable, and set the duty cycle of each internal
MOSFET switch. Low external parts count (two
1?F flying capacitors and two small bypass capac-
itors at V
IN
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 V
IN
and reduces quiescent current to less than 1?A.
The AAT3129 is available in a Pb-free, 12-pin
TSOPJW package.
Features
?V
IN
Range: 2.7V to 5.5V
? Common Anode RGB LED Control
? 4096 Color with Single Wire Digital Control
? 40mA to 180mA Fixed Current Source
?AS
2
Cwire Digital Brightness Control
? Low Noise Constant Frequency Operation
? Small Application Circuit
? Regulated Output Current
? No Inductors
? 1MHz Switching Frequency
?I
Q
<1?A 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?F
V
BAT
C
CP
1?F
C1
1?F
C2
1?F
VIN
CP
C1+
C1-
C2+
C2-
DR
DG
DB
EN/SETEN/SET
GND
AAT3129
GR B
ISRC
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