AAT3132

• V_IN Range: 2.7 - 5.5 Volts
• < 1.0µA of Shutdown current
• 1.0 MHz Switching Frequency
• White LED Backlighting
• Fully Independent Display Lighting
• Drives Low-V_F & High-V_F Type LEDs
• Up to three 20mA Outputs
• Single 25 or 30mA 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

• White LED Backlighting
• White Photo-Flash for DSC's
• Color (RGB) Lighting
• Programmable Current Source

The AAT3132 is a low noise, constant frequency charge pump DC/DC converter that uses 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 up to 25 or 30mA in one of its outputs to drive LEDs from a 2.7V to 5.5V input. Outputs may be operated individually or paralleled for driving higher-current LEDs. Low external parts count (two 1µF flying capacitors and two small 1µF capacitors at V_IN, and OUT) make the AAT3132 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 AAT3132 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 AAT3132 is available in very small 12 pin TSOPJW12 package.