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AAT3340IWP-1-T1 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT3340IWP-1-T1 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
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1 / 14 page  AAT3340 High Efficiency 1x/1.5x Charge Pump ChargePumpTM PRODUCT DATASHEET 3340.2008.04.1.0 1 www .analogictech.com General Description The AAT3340 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 effi- ciency for white LED applications. The AAT3340 is capable of driving 4 white LEDs at a total of 80mA from a single 2.7V to 5.5V input. The current sinks may be operated individually or in parallel while driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) makes the AAT3340 ideal for small battery-powered applications. Analogic Tech’s Simple Serial Control (S2Cwire) digital interface is used to enable, disable and set current to one of 32 levels for the LEDs. The AAT3340 is equipped with built-in short-circuit and over-temperature protection. The soft-start circuitry pre- vents excessive inrush current at start-up and mode transitions. The AAT3340 family is available in Pb-free, space-saving TSOPJW and TDFN33 packages, and oper- ates over the -40°C to +85°C ambient temperature range. Features • Dual-Mode (1x/1.5x) Charge Pump • Drives up to 4-Channel Backlight LEDs • 32-Level Programmable Backlight Current (linear, inverting) • Single-wire S2Cwire Control • Built-in Thermal Protection • Automatic Soft Start • -40°C to +85°C Temperature Range • TSOPJW-12 and TDFN33-12 Packages Applications • Cellular and Smart Phones • Digital Still and Video Cameras • PDAs • Portable Devices • Portable Media Players • Other White LED Backlighting Typical Application VBATTERY 3.6V EN/SET S2Cwire Serial Control IN EN/SET C2+ C2- C1+ C1- OUT BL1 BL2 BL3 GND CIN 1µF D1 C1 1µF C2 1µF D2 D3 D4 COUT 1µF BL4 AAT3340 |
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