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MP3204 Folha de dados(PDF) 1 Page - Monolithic Power Systems |
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MP3204 Folha de dados(HTML) 1 Page - Monolithic Power Systems |
1 / 8 page MP3204 1.3MHz Fixed Frequency 5 White LED Driver with Open LED Protection MP3204 Rev. 1.3 www.MonolithicPower.com 1 9/23/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. The Future of Analog IC Technology TM TM DESCRIPTION The MP3204 is a step-up converter designed for driving up to 5 series white LEDs from a single cell Lithium Ion battery. The MP3204 uses current mode, fixed frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its low 104mV feedback voltage reduces power loss and improves efficiency. The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The MP3204 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. The MP3204 is available in a small 6-pin TSOT23 package. EVALUATION BOARD REFERENCE Board Number Dimensions EV3204DJ-00A 1.9”X x 1.8”Y x 0.4”Z FEATURES • On Board Power MOSFET • Drives up to 5 Series White LEDs • Up to 87% Efficiency • Over 1MHz Fixed Switching Frequency • Low 104mV Feedback Voltage • Soft-Start/PWM Dimming • UVLO, Thermal Shutdown • Internal Current Limit • Open Load Shutdown • Available in a TSOT23-6 Package APPLICATIONS • Cell Phones • Handheld Computers and PDAs • Digital Still Cameras • Small LCD Displays “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP3204 VIN 5V LED1 LED2 LED3 LED4 LED5 EN MP3204-TAC-S01 FB OV EN 1 5 3 2 4 6 SW IN GND 88 87 86 85 84 83 82 81 80 79 78 77 5 101520 LED CURRENT (mA) MP3204-EC01 Efficiency vs LED Current 3 LEDs 4 LEDs VIN=3.6V 5 LEDs |
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