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AAT3131ITP-T1 Datasheet(PDF) 1 Page - Advanced Analogic Technologies

Part # AAT3131ITP-T1
Description  High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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AAT3131
High Efficiency 1X/1.5X Fractional
Charge Pump for White LED Applications
3131.2004.08.1.1
1
ChargePump
General Description
The AAT3131 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 maximize efficiency for White LED appli-
cations. The device can be used to produce cur-
rent levels up to 20mA in three of its outputs, and
30mA in one of its outputs to drive LEDs from a
2.7V to 5.5V input. Outputs may be operated indi-
vidually or paralleled for driving higher-current
LEDs. Low external parts counts (two 1µF flying
capacitors and two small 1µF capacitors at VIN,
and OUT) make the AAT3131 ideally suited for
small battery-powered applications.
AnalogicTech™'s
Simple
Serial
Control™
(S2Cwire™) interface is used to enable, disable
and set the LED drive current in two groups: the
three 20mA outputs and the single 30mA output
with multiple level logarithmic scales. The AAT3131
has a thermal management system to protect the
device in the event of a short circuit condition at the
output pin.
Built-in soft-start circuitry prevents
excessive inrush current during start-up. A high
charge pump switching frequency enables the use
of very small external capacitors. A low current
shutdown feature disconnects the load from VIN
and reduces quiescent current to less than 1µA.
The AAT3131 is available in very small 12 pin
TSOPJW12 package.
Features
•VIN Range: 2.7 - 5.5 Volts
< 1.0µA of Shutdown current
1.0 MHz Switching Frequency
White LED Backlighting
Fully Independent Display Lighting
Dual Mode 1x and 1.5x Charge Pump for
Maximum Efficiency
Drives Low-VF & High-VF f Type LED's
Up to three 20mA Outputs
Single 30 mA Output
Multi Position Logarithmic Scale with Digital
Control
Low Noise Constant Frequency Operation
Regulated Output Current
Automatic Soft-Start
No Inductors
-40 to +85°C Temperature Range
12 pin TSOPJW-12 package
Applications
White LED Backlighting
White Photo-Flash for DSC's
Color (RGB) Lighting
Programmable Current Source
Typical Application
CIN
1
µF
VBATTERY
COUT
1
µF
EN/SET
C1
1
µF
C2
1
µF
D5
D3
D2
D1
VIN
VOUT
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3131
D4


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