AAT3129 Datasheet, PDF (1/14 Pages) Advanced Analogic Technologies – High Efficiency 1X/1.5X/2X Charge Pump for RGB Color LED Applications

AAT3129
High Efficiency 1X/1.5X/2X Charge Pump
for RGB Color LED Applications
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 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 1µA.
The AAT3129 is available in a Pb-free, 12-pin
TSOPJW package.
Typical Application
Features
ChargePump^™
• 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
• AS²Cwire Digital Brightness Control
• Low Noise Constant Frequency Operation
• Small Application Circuit
• Regulated Output Current
• No Inductors
• 1MHz Switching Frequency
• I_Q <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
VIN
ISRC
C1+
V_BAT
C_IN
CP
C1
1µF
AAT3129
1µF
C_CP
C1-
1µF
C2+
RG B
C2
1µF
C2-
EN/SET
DR
EN/SET
DG
DB
GND
3129.2005.11.1.3
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