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AAT3167ISN-T1 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT3167ISN-T1 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
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1 / 14 page  General Description The AAT3167 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 AAT3167 is capable of driving five LEDs for a total of 135mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at IN and OUTCP) make this part ideally suited for small, battery-powered applications. AnalogicTech's AS2Cwire™ (Advanced Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 115µA. For optimized efficiency, low-current set- tings require only 50µA of housekeeping current. Each output of the AAT3167 is equipped with built- in protection for output short circuit and auto-dis- able for load short-circuit conditions. Built-in soft- start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature dis- connects the load from the input and reduces qui- escent current to less than 1µA. The AAT3167 is available in a Pb-free, space-sav- ing, thermally-enhanced, 14-pin 3x3mm STDFN or 16-pin 4x4mm QFN package and is rated over the -40°C to +85°C temperature range. Features •VIN Range: 2.7V to 5.5V • Fully Programmable Current with Single Wire — 16-Step Logarithmic Scale — 14/18/27mA Max Current — Four Low-Current Settings Down to 115µA — Low IQ (50µA) for Single-Channel, Low- Current Mode • Tri-Mode 1X, 1.5X, 2X Charge Pump for Maximum Efficiency and VF Coverage • Drives Up to Five LEDs • Individual Main-Sub (4-1) Group Control • No Inductors, Low Noise Operation • 1MHz Constant Switching Frequency • Small Application Circuit • Built-In Thermal Protection • Built-In Auto-Disable for Open Circuit • Automatic Soft Start •IQ <1µA in Shutdown • STDFN33-14 or QFN44-16 Package Applications • Color (RGB) Lighting • Programmable Current Sink • Transmissive LCD Display • White LED Backlighting • White Photo Flash for Digital Still Cameras AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Typical Application C1 1µF C2 1µF D1 D2 D3 D4 D5 COUT 1µF CIN 1µF 2.7V to 5.5V EN/SET IN EN/SET C1+ C1- C2+ C2- OUTCP D1 D2 D3 D4 D5 GND AAT3167 3167.2007.03.1.4 1 ChargePump™ |
Similar Part No. - AAT3167ISN-T1 |
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Similar Description - AAT3167ISN-T1 |
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