AAT3156
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
General Description
The AAT3156 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-
mode load switch (1X), fractional (1.5X), and dou-
bling (2X) conversion to maximize efficiency for
white LED applications. The AAT3156 is capable of
driving six-channel LEDs at a total of 180mA from
a 2.7V to 5.5V input. The current sinks may be
operated individually or in parallel for driving high-
er-current LEDs. A low external parts count (two
1碌F flying capacitors and two small 1碌F capacitors
at V
IN
and V
OUT
) make this part ideally suited for
small battery-powered applications.
AnalogicTech's AS
2
Cwire鈩?(Advanced Simple
Serial Control鈩? serial digital input is used to
enable, disable, and set current for each LED with
a 16-level logarithmic scale plus four low-current
settings down to 50碌A(chǔ) for optimized efficiency, with
a low housekeeping current of only 50碌A(chǔ).
Each output of the AAT3156 is equipped with built-
in protection for V
OUT
short circuit and auto disable
for LED failure condition. Built-in soft-start circuitry
prevents excessive inrush current during start-up.
A low current shutdown feature disconnects the
load from V
IN
and reduces quiescent current to less
than 1碌A(chǔ).
The AAT3156 is available in a space-saving, ther-
mally-enhanced 16-pin 4x4mm QFN package.
Features
鈥?/div>
鈥?/div>
ChargePump
鈩?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
V
IN
Range: 2.7V to 5.5V
Fully Programmable Current with Single Wire
鈥?16-Step Logarithmic Scale
鈥?15/20/30mA Max Current
鈥?Four Low Current Settings Down to 50碌A(chǔ)
鈥?Low I
Q
(50碌A(chǔ)) for Low Current Mode
Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and V
F
Coverage
Drives Six Channels of LEDs
Individual Main/Sub-Group Control
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Built-In Auto-Disable For Open Circuit
Automatic Soft-Start
I
Q
<1碌A(chǔ) in Shutdown
Thermally-Enhanced QFN44-16 Package
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Color (RGB) Lighting
Programmable Current Sinks
White LED Backlighting
White Photo Flash for DSCs
Typical Application
2.7V to 5.5V
C
IN
1碌F
VIN
C1+
C1
1碌F
C1-
C2+
AAT3156
C2-
VOUT
C2
1碌F
D1
D2
D3
D4
D5
D6
C
OUT
1碌F
EN/SET
EN/SET
D1
D2
D3
D4
D5
GND
D6
3156.2005.06.1.1
1
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