High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
General Description
The AAT3122 is a low noise, constant frequency
charge pump DC/DC converter that uses a dual
mode Load Switch (1X) and fractional (1.5X) con-
version to increase efficiency in White LED appli-
cations. With input voltages ranging from 2.7-5.5
Volts, the device can produce an output current of
up to 120mA. A low external parts count (two 1碌F
flying capacitors and two small bypass capacitors
at V
IN
and OUT) makes the AAT3122 ideally suited
for small battery-powered applications.
AnalogicTech鈩?s Simple Serial Control鈩?/div>
(S
2
Cwire鈩? interface is used to enable, disable
and set the LED drive current with a 32 level loga-
rithmic scale LED brightness control. The AAT3122
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 shutdown current feature
disconnects the load from V
IN
and reduces quies-
cent current to less than 1碌A(chǔ). The AAT3122 pro-
vides a single current source output that can be
used to drive up to 6 LEDs at 20mA each. The
AAT3122 is available in a TSOPJW-12 package.
AAT3122
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
ChargePump
鈩?/div>
V
IN
Range: 2.7V to 5.5V
<1碌A(chǔ) of Shutdown Current
1 MHz Switching Frequency
Dual Mode 1x and 1.5x Charge Pump for
Maximum Efficiency
Only 4 External components
Simple Serial Control鈩?(S
2
Cwire) Interface
Low Noise Constant Frequency Operation
33% Less Input Current Than Doubler Charge
Pumps
Small Application Circuit
Regulated Output Current
Automatic Soft-Start
No Inductors
TSOPJW-12 Package
-40 to +85C擄 Temperature Range
Applications
鈥?/div>
鈥?/div>
White LED Backlighting
Programmable Current Source
Typical Application
V
IN
C1+
C1
1碌F
AAT3122
V
OUT
V
BATTERY
C
IN
1碌F
C
OUT
1碌F
C2-
EN/SET
EN/SET
GND
D
C1-
C2+
C2
1碌F
D1
D2
D3
D4
D5
D6
3122.2004.08.1.2
1
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