TM MP1518 Fixed Frequency White LED Driver TM The Future of Analog IC Technology DESCRIPTION FEATURES The MP1518 is a step-up converter designed for On Board Power MOSFET driving up to 6 series white LEDs from a single Drives up to 6 Series White LEDs cell Lithium Ion battery. The MP1518 uses current Up to 87% Efficiency mode, fixed frequency architecture to regulate the Over 1MHz Fixed Switching Frequency LED current, which is measured through an Open Load Shutdown external current sense resistor. Its low 104mV Low 104mV Feedback Voltage feedback voltage reduces power loss and Soft-Start/PWM Dimming improves efficiency. The OV pin monitors the UVLO, Thermal Shutdown output voltage and turns off the converter if an Internal Current Limit over-voltage condition is present due to an open Available in TSOT23-6 and QFN8 Packages circuit condition. APPLICATIONS The MP1518 includes under-voltage lockout, current limiting and thermal overload protection Cell Phones preventing damage in the event of an output Handheld Computers and PDAs overload. Digital Still Cameras Small LCD Displays The MP1518 is available in small 6-pin TSOT23 or 8-pin QFN (2mm x 2mm) packages. All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. MPS and The Also available is the MP1518DJE, which has Future of Analog IC Technology are Trademarks of Monolithic Power Systems, Inc. slightly slower switching slew rate, thus is ideal for applications where low EMI is critical. EVALUATION BOARD REFERENCES Board Number Dimensions EV0056 1.9X x 1.8Y x 0.4Z EV1518DG-00A 2.0X x 1.8Y x 0.4Z TYPICAL APPLICATION Efficiency vs V IN LED Current 5V LED1 88 4 LEDS LED2 86 LED3 6 LEDS LED4 84 3 LEDS IN SW LED5 82 EN OV EN MP1518 LED6 80 GND FB 78 V = 3.6V IN 76 5 101520 LED CURRENT (mA) MP1518 Rev. 1.61 www.MonolithicPower.com 1 4/18/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved. EFFICIENCY (%)TM MP1518 FIXED FREQUENCY WHITE LED DRIVER ORDERING INFORMATION Part Number Package Top Marking MP1518DJ* A8 TSOT23-6 MP1518DJE F6 QFN8 (2x2mm) MP1518DG** A8 * For Tape & Reel, add suffix Z (e.g. MP1518DJZ) For RoHS, compliant packaging, add suffix LF (e.g. MP1518DJLFZ). * For Tape & Reel, add suffix Z (e.g. MP1518DGZ) For RoHS, compliant packaging, add suffix LF (e.g. MP1518DGLFZ). PACKAGE REFERENCE TOP VIEW TOP VIEW GND 1 8 SW SW 1 6 IN IN 2 7 NC GND 2 5 OV OV 3 6 FB FB 3 4 EN EN 4 5 GND TSOT23-6 QFN8 (2mm x 2mm) (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC SW , OV Pins................................0.5V to +28V TSOT23-6 ..............................220 .... 110.. C/W All Other Pins..............................0.3V to +6.5V QFN8 (2mm x 2mm) ...............80 ...... 16... C/W (2) Continuous Power Dissipation (T = +25C) A Notes: TSOT23-6....0.57W 1) Exceeding these ratings may damage the device. QFN8 (2x2mm)....1.6W 2) The maximum allowable power dissipation is a function of the maximum junction temperature T (MAX), the junction-to- J Storage Temperature.............. 55 C to +150 C ambient thermal resistance , and the ambient temperature JA T . The maximum allowable continuous power dissipation at A (3) Recommended Operating Conditions any ambient temperature is calculated by P (MAX) = (T D J (MAX)-T )/ . Exceeding the maximum allowable power A JA IN Supply Voltage ..............................2.5V to 6V dissipation will cause excessive die temperature, and the Output Voltage....................................V to 25V IN regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent Operating Junction Temp. (T ). -40C to +125C J damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. MP1518 Rev. 1.61 www.MonolithicPower.com 2 4/18/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved.