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AAT3123 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT3123 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
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1 / 18 page  AAT3123/23A/24 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications 3123.2005.12.1.4 1 ChargePump™ General Description The AAT3123/23A/24 is a low noise, constant fre- quency 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 to drive up to six LEDs from a 2.7V to 5.5V input. Outputs may be operat- ed individually or paralleled for driving higher-cur- rent LEDs. A low external parts count (two 1 µF fly- ing capacitors and two small 1 µF capacitors at V IN and OUT) make the AAT3123/23A/24 ideally suited for small battery-powered applications. AnalogicTech’s Simple Serial Control™ (S 2Cwire™) interface is used to enable, disable, and set the LED drive current with a 32-level logarithmic scale LED brightness control. The AAT3123/23A/24 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 V IN and reduces quies- cent current to less than 1 µA. The device also inte- grates a test current/auto-disable feature for each channel. The AAT3123/23A is available in a very small, Pb-free 12-pin TSOPJW package. The six output AAT3124 is available in a Pb-free 16-pin 4x4mm QFN package. Features •V IN Range: 2.7V to 5.5V • Dual Mode 1X and 1.5X Charge Pump for Maximum Efficiency • Drives Low-V F and High-VF Type LEDs • Up to Six 20mA Outputs (AAT3124) • Up to Four 20mA Outputs (AAT3123/23A) • 32-Position Logarithmic Scale with Digital Control • Simple Serial Control (S 2Cwire) Interface • Low Noise Constant Frequency Operation • 1MHz Switching Frequency • Small Application Circuit • Regulated Output Current • Automatic Soft Start • No Inductors •I Q <1µA in Shutdown • Temperature Range: -40°C to +85°C • 12-Pin TSOPJW Package (AAT3123/23A) • 16-Pin 4x4mm QFN Package (AAT3124) Applications • Color (RGB) Lighting • Programmable Current Source • White LED Backlighting • White Photo Flash for DSCs Typical Application CIN 1 µF VBATTERY COUT 1 µF EN/SET C1 1 µF C2 1 µF D6 D5 D4 D3 VIN VOUT C1+ C1- C2+ C2- D1 D2 D3 D4 EN/SET GND AAT3124 D5 D6 D2 D1 |
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