TM EV3204DJ-00A Fixed Frequency White LED Driver The Future of Analog IC Technology TM EVALUATION BOARD GENERAL DESCRIPTION FEATURES 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. • • • • ELECTRICAL SPECIFICATION “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. Parameter Input Voltage Number of WLEDs Symbol Value Units VIN 2.5 to 6 1 to 5 V On Board Power MOSFET Drives up to 5 Series White LEDs Up to 87% Efficiency Over 1MHz Fixed Switching Frequency Open Load Shutdown Low 104mV Feedback Voltage Soft-Start/PWM Dimming UVLO, Thermal Shutdown Internal Current Limit APPLICATIONS Cell Phones Handheld Computers and PDAs Digital Still Cameras Small LCD Displays Application EV3204DJ-00A EVALUATION BOARD EFFICIENCY (%) Efficiency vs LED Current 88 87 86 85 84 83 82 81 80 79 78 77 4 LEDs 5 LEDs 3 LEDs VIN=3.6V 5 10 15 LED CURRENT (mA) Dimensions (1.9”X x 1.8”Y x 0.4”Z) Board Number MPS IC Number EV3204DJ-00A MP3204DJ EV3204DJ-00A Rev. 1.1 7/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 20 MP3204-EC01 1 TM EV3204DJ-00A – FIXED FREQUENCY WHITE LED DRIVER EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN D1 B0530WS-7 30V 500mA LED1 LED2 LED3 U1 IN LED4 SW OV OFF ON EN LED5 MP3204 FB GND EV3204_S01 EV3204DJ-00A BILL OF MATERIALS Qty Ref Value Description 1 C1 2.2µF Ceramic Capacitor, 10V, X5R 1 C2 0.22µF Ceramic Capacitor, 25V, X7R 1 D1 1 L1 5 LED1, LED2, LED3, LED4, LED5 1 R1 1 R2 1 U1 Diode Schottky, 30V, 0.5A 22µH Inductor, 330mA Package Manufacturer Manufacturer P/N 0805 TDK C2012X5R1A225K 0805 TDK C2012X7R1E224K SOD-323 Diodes Inc. B0530WS-7 D31FB Toko 984FB-220M 0805 Panasonic ERJ-6GEYJ104V 0805 Panasonic ERJ-6GEYJ5R1V TSOT23-6 MPS MP3204DJ Not Stuffed 100kΩ Resistor, 5% 5.1Ω EV3204DJ-00A Rev. 1.1 7/13/2005 Resistor, 1% Fixed Frequency, White LED Driver www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 TM EV3204DJ-00A – FIXED FREQUENCY WHITE LED DRIVER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer QUICK START GUIDE 1. Solder LED1 through LED5 to the board. 2. Connect the positive and negative terminals of power supply (2.5V to 6V) to VIN and GND pins, respectively. 3. Drive EN high to turn on the MP3204; low to shut it down. 4. To use burst-mode brightness control, drive EN with a PWM signal. NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV3204DJ-00A Rev. 1.1 7/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3