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AAT3120ITP-T1 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT3120ITP-T1 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
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1 / 14 page  AAT3120 3-Channel Charge Pump For White LED Applications 3120.2005.11.1.1 1 ChargePump™ General Description The AAT3120 is a low noise, constant frequency charge pump DC/DC converter that uses fractional (1.5X) conversion to improve efficiency for white LED applications. The device can be used to pro- duce eight current levels up to 20mA per channel for up to three channels. 1X load switch mode is also built-in to improve efficiency at low current set- tings. Low external parts count (two 1µF flying capacitors and two small 1µF capacitors at V IN and OUT) makes the AAT3120 ideally suited for small battery-powered applications. AnalogicTech's S 2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED at eight different levels. The AAT3120 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 circuit- ry 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 V IN and reduces quiescent current to less than 1µA. The AAT3120 is available in the very small Pb-free 12-pin TSOPJW package. Features •V IN Range: 2.7V to 5.5V • Fractional Charge Pump Mode • Drives Low-V F and High-VF Type LEDs • Up to Three LED Outputs — Single Wire Programming — Eight Regulated Current Settings — Max 20mA per Channel • Low Noise Constant Frequency Operation • No Inductors • 1MHz Switching Frequency • Small Application Circuit • Automatic Soft-Start •I Q <1µA in Shutdown • 12-Pin TSOPJW Package Applications • Color (RGB) Lighting • Programmable Current Source • White LED Backlighting • White Photo Flash for DSCs Typical Application C IN 1 µF V BATTERY C OUT 1 µF EN/SET C1 1 µF C2 1 µF D3 VIN VOUT C1+ C1- C2+ C2- D1 D2 D3 EN/SET GND AAT3120 D2 D1 |
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