AAT AAT3131
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) conversion to maximize efficiency for white LED applications. The device can be used to produce current 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. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and OUT) makes the AAT3131 ideally suited for small battery-powered applications.| Part No. | AAT3131 |
|---|---|
| Datasheet | AAT3131 Download |
| Manufacturer |  AAT |
| Description | High Efficiency 1X/1.5X Fractional Charge Pump |
| Buy | Stock & Price |
APPLICATIONS
GENERAL DESCRIPTION
Outputs may be operated individually or paralleled for driving higher-current LEDs.FEATURES
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● ChargePump™ 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
APPLICATIONS
during start-up. A high charge pump switching frequency enables the use of very small external● Color (RGB) Lighting capacitors. A low-current shutdown feature discon● Programmable Current Source nects the load from VIN and reduces quiescent cur● White LED Backlighting rent to less than 1µA. The AAT3131 is available in
● White Photo Flash for Digital Still Cameras a Pb-free 12-pin TSOPJW12 package and is rated over the -40°C to +85°C temperature range.
