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AAT - High Efficiency 1X/1.5X/2X Charge Pump

Numéro de référence AAT3141
Description High Efficiency 1X/1.5X/2X Charge Pump
Fabricant AAT 
Logo AAT 





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AAT3141 fiche technique
AAT3141
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
General Description
Features
ChargePump
The AAT3141 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-mode
load switch (1X), fractional (1.5X), and doubling (2X)
conversion to maximize efficiency for white LED appli-
cations. The device produces current levels up to
30mA on each of its four current source outputs to
drive various arrangements of LEDs from a 2.7V to
5.5V input. Outputs may be operated individually or in
parallel for driving higher-current LEDs. A low external
parts count (two 1µF flying capacitors and two small
1µF capacitors at VIN and CP) make the AAT3141 ide-
ally suited for small battery-powered applications.
The AAT3141 is equipped with AnalogicTech’s unique
AutoBias™ technology which allows individual LEDs
to be powered either by charge pump or battery input,
determined internally and automatically to maximize
the power efficiency even with a large difference in
LED forward voltage.
• VIN Range: 2.7V to 5.5V
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and VF Coverage
• Drives Low-VF and High-VF Type LEDs
• Up to Four 30mA Outputs
• AS2Cwire Independent 3+1 Output Addressing
• 32-Position Logarithmic Scale with Digital
Control
• Low Noise Constant Frequency Operation
• 1MHz Switching Frequency
• AutoBias Technology
• Small Application Circuit
• Regulated Output Current
• Automatic Soft Start
• No Inductors
• IQ <1µA in Shutdown
• 12-Pin TSOPJW Package
AnalogicTech's Advanced Simple Serial Control™
(AS2Cwire™) digital input is used
and set the LED drive current with
to
a
enable,
32-level
disable,
logarith-www.DataSheet4U.com
Applications
mic scale LED brightness control. The AAT3141 has a
thermal management system to protect the device in
the event of a short-circuit condition at an output pin.
Built-in soft-start circuitry prevents excessive inrush
current during start-up. A high charge pump switching
• Color (RGB) Lighting
• Programmable Current Sources
• White LED Backlighting
• White Photo Flash for Digital Still Cameras
frequency enables the use of very small external
capacitors. In shutdown mode, the device disconnects
the load from VIN and reduces quiescent current to
less than 1µA. The AAT3141 is available in the very
small, Pb-free 12-pin TSOPJW package.
Typical Application
VBATTERY
CIN CCP
1μF 1μF
EN/SET
VIN C1+
CP C1-
C2+
AAT3141
C2-
EN/SET
D1
D2
D3
D4
GND
C1
1μF
C2
1μF
D4 D3 D2 D1
3141.2007.03.1.3
1

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