High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
General Description
The AAT3140 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 1碌F flying capacitors and two small
1碌F capacitors at V
IN
and CP) make the AAT3140 ide-
ally suited for small battery-powered applications.
The AAT3140 is equipped with AnalogicTech鈥檚 unique
AutoBias鈩?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.
AnalogicTech's Simple Serial Control鈩?(S
2
Cwire鈩?
digital input is used to enable, disable, and set the
LED drive current with a 32-level logarithmic scale
LED brightness control. The AAT3140 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 fre-
quency enables the use of very small external capac-
itors. In shutdown mode, the device disconnects the
load from V
IN
and reduces quiescent current to less
than 1碌A(chǔ). The AAT3140 is available in the very small
12-pin TSOPJW package.
AAT3140
Features
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ChargePump
鈩?/div>
V
IN
Range: 2.7V to 5.5V
Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and V
F
Coverage
Drives Low-V
F
and High-V
F
Type LEDs
Up to 4, 30mA Outputs
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
I
Q
< 1碌A(chǔ) in Shutdown
12-Pin TSOPJW Package
Applications
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鈥?/div>
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Color (RGB) Lighting
Programmable Current Sources
White LED Backlighting
White Photo Flash for DSCs
Typical Application
VIN
C1+
C1
1碌F
CP
V
BATTERY
C
IN
1碌F
C
CP
1碌F
C1-
C2+
C2
1碌F
AAT3140
C2-
D1
D2
D3
D4
EN/SET
EN/SET
D4
GND
D3
D2
D1
3140.2005.03.1.1
1
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