AAT3351 Datasheet | Anadigics

PRODUCT DATASHEET .. High Efficiency 1x/1.5x Charge Pump Features - - - - Drives up to 4 LEDs at up to 30m A, each Automatic Switching Between 1x and 1.5x Modes 1MHz Switching Frequency Linear LED Output Current Control - Single-wire, S2Cwire Interface - 32-step ±10% LED Output Current Accuracy 3% LED Output Current Matching Low-Current Shutdown Mode Automatic Soft-Start TSOPJW-12 and TDFN33-12 Packages Charge Pump TM General Description The AAT3351 is a low-noise, constant-frequency charge pump DC/DC converter that uses a dual-mode load switch (1x) and fractional (1.5x) charge pump to maximize efficiency for white LED applications. AAT3351 is capable of driving 4 white LEDs at a total of 120m A from single 2.7V to 5.5V input. The current sinks may be operated individually or in parallel while driving highercurrent LEDs. A low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and VOUT) makes the AAT3351 ideal for small battery-powered applications. Analogic Tech’s S2Cwire™ serial digital input is used to enable, disable, and set current to one of 32 levels for the LEDs. The AAT3351 is equipped with built-in short-circuit protection. The soft-start circuitry prevents excessive inrush current at start-up and mode transitions. The AAT3351 family is available in Pb-free, space-saving TSOPJW and TDFN33 packages, and operates over the -40°C to +85°C ambient temperature range. - - - - - Applications - - - - - - Cellular and Smart Phones Digital Still and Video Cameras PDAs Portable Devices Portable Media Players Other White LED Backlighting Typical Application C1+ C1 1µF C1VBATTERY 3.6V C IN 1µF IN C2OUT C OUT 1µF D1 D2 D3 D4 C2+ C2 1µF D1 EN/SET EN/SET S2Cwire Serial Control D2 D3 D4 GND .analogictech. PRODUCT DATASHEET .. High Efficiency 1x/1.5x Charge Pump Charge Pump TM Pin Descriptions Pin Number TDFN33-12 1 2 3 4 5 6 7 8 9 10 11 12 EP...