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AP3156 Datasheet(PDF) 1 Page - Diodes Incorporated |
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AP3156 Datasheet(HTML) 1 Page - Diodes Incorporated |
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1 / 15 page  AP3156 HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS AP3156 Rev. 1 1 of 15 SEPTEMBER 2009 www.diodes.com © Diodes Incorporated • VIN Range: 2.7V to 5.5V • Fully Programmable Current with Single Wire • 32-Step Logarithmic Scale • 20/25mA Max Current per Channel • Four Low Current Settings Down to 50µA • Low I Q (50µA) for Low Current Mode • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage • Drives up to Six Channels of LEDs • Individual Main/Sub-Group Control • No Inductors, Low Noise Operation • 0.5/1/2MHz Constant Switching Frequency • Small Application Circuit • Built-In Thermal Protection • Built-In Auto-Disable For Open Circuit • Automatic Soft Start • IQ <1µA in Shutdown • Thermally-Enhanced QFN4040-16 Package: Available in “Green” Molding Compound (No Br, Sb) • Lead Free Finish / RoHS Compliant (Note 1) The AP3156 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The AP3156 is capable of driving the LED channels at 120mA maximum 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 VIN and VOUT) make this part ideally suited for small, battery-powered applications. AP3156 serial digital input is used to enable, disable and set current for each LED with a 32-level logarithmic scale plus four low-current settings down to 50µA for optimized efficiency, with a low quiescent current of only 50µA. Each output of the AP3156 is equipped with built-in protection for VOUT short circuit and auto-disable for LED failure conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA. The AP3156 is available in a lead-free, space-saving, thermally enhanced 16-pin 4x4mm QFN package. Applications • Color (RGB) Lighting • Programmable Current Sinks • White LED Backlighting • White Photo Flash for Digital Still Cameras Typical Application Circuit VIN 1uF CIN AP3156 C2P C2N C1N VOUT D4 D1 D2 D3 GND SDI SDI 2 10 VIN 1uF C2 8 5 1uF C1 7 6 C1P 9,11 4 15 D6 LED 14 D5 LED 13 D4 LED 12 D3 LED 1uF COUT D5 D6 1 16 D2 LED D1 LED Features General Description |
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