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AAT3143ITP-T1 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT3143ITP-T1 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
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1 / 11 page  General Description The AAT3143 is a low noise, constant frequency charge pump DC/DC converter that uses a tri- mode load switch (1X), fractional (1.5X), and dou- bling (2X) conversion to maximize efficiency for white LED applications. The AAT3143 can deliver current levels up to 80mA to drive white LEDs con- nected to the four current source outputs from a 2.7V to 5.5V input. The current source outputs may source up to 20mA each and may be operated indi- vidually or in parallel for driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) makes the AAT3143 ideally suited for small battery-powered applications. Output current, and therefore brightness, is con- trolled via externally applied Pulse Width Modulation (PWM) control. Typically, PWM frequencies of up to 50kHz can be applied. The AAT3143 has a thermal management system to protect the device in the event of a short-circuit con- dition at the voltage output pin. Built-in soft-start cir- cuitry prevents excessive inrush current during start- up. A high charge pump switching frequency allows the use of very small external capacitors. A low cur- rent shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA. The AAT3143 is available in a Pb-free, space-sav- ing, 2.85x3.0mm 12-pin TSOPJW package. Features • Input Voltage Range: 2.7V to 5.5V • PWM Brightness Control • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage • Drives Four Low- or High-VF Type LEDs • Up to 20mA LED Current per Channel • No Inductors • 1MHz Switching Frequency • Small Application Circuit • AutoBias™ Technology •IQ <1µA in Shutdown • 2.85x3.0mm TSOPJW-12 Package Applications • Programmable Current Sources • White LED Backlighting • White Photo Flash for Digital Still Cameras AAT3143 High Efficiency 1X/1.5X/2X Charge Pump with PWM Control for White LED Applications Typical Application C1 1µF C2 1µF D1 D2 D3 C OUT 1µF C IN 1µF 2.7V to 5.5V PWM/EN IN EN/PWM C1+ C1- C2+ C2- CP D1 D2 D3 GND AAT3143 D4 D4 3143.2006.05.1.0 1 ChargePump™ |
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