PRODUCT DATASHEET
AAT3113, AAT3114/14A
ChargePump
TM
High Efficiency 1.5X Fractional Charge Pumps For White LED Applications
Features
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AAT3113: Four Outputs
AAT3114/14A: Six Outputs
20mA Full-Scale Current
Simple Serial Control (S
2
Cwire) Interface
▪
32-Position Logarithmic Scale with Digital Control
Low Noise Constant Frequency Operation
33% Less Input Current Than Doubler Charge Pump
High Accuracy Brightness Matching
Small Application Circuit
Regulated Output Current
Automatic Soft Start
V
IN
Range: 2.7V to 5.5V
No Inductors
600kHz Switching Frequency
I
Q
<1µA in Shutdown
Temperature Range: -40°C to 85°C
12-Pin TSOPJW Package (AAT3113)
16-Pin QFN Package (AAT3114/14A)
General Description
The AAT3113 and AAT3114/14A are low noise, constant
frequency charge pump DC/DC converters that use frac-
tional (1.5X) conversion to increase efficiency in white
LED applications. The devices can be used to produce
current levels up to 20mA for each output from a 2.7V
to 5.5V input. A low external parts count (two 1µF flying
capacitors and two small bypass capacitors at V
IN
and
OUT) makes these devices ideally suited for small, bat-
tery-powered applications.
AnalogicTech’s Simple Serial Control™ (S
2
Cwire™) inter-
face is used to enable, disable, and set the LED drive
current for 32-level logarithmic scale LED brightness
control. AAT3113 and AAT3114/14A devices have a ther-
mal management system for protection 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. A high switching frequency enables the
use of small external capacitors. A low-current shutdown
feature disconnects the load from V
IN
and reduces quies-
cent current to less than 1µA. The AAT3113 provides
four LED current source outputs, and the AAT3114/14A
provides six. The AAT3113 is available in a Pb-free
12-pin TSOPJW package, and the AAT3114/14A is avail-
able in a Pb-free 16-pin QFN package.
Applications
• Programmable Current Source
• White LED Backlighting
Typical Application
VIN
C1+
C1
1µF
OUT
V
BATTERY
C
IN
1µF
C
OUT
1µF
C1-
C2+
C2
1µF
V
BATTERY
OUT
C
IN
1µF
C
OUT
1µF
VIN
C1+
C1
1µF
C1-
C2+
C2
1µF
AAT3113
C2-
D1
D2
D3
D4
AAT3114/14A
C2-
D1
D2
D3
D4
D5
D6
EN/SET
EN/SET
GND
EN/SET
EN/SET
GND
D4
D3
D2
D1
D6
D5
D4
D3
D2
D1
3113.2008.05.1.10
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1
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