MP3205DJ

TM EV3205DJ-00A 1.3MHz Fixed Frequency 5 White LED Driver EVALUATION BOARD The Future of Analog IC Technology TM GENERAL DESCRIPTION The MP3205 is a step-up converter designed for driving up to 5 series white LEDs from a single cell Lithium Ion battery. The MP3205 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 MP3205 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. The MP3205 is available in a small 5-pin TSOT23 package. 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 Cell Phones Handheld Computers and PDAs Digital Still Cameras Small LCD Displays Application APPLICATIONS ELECTRICAL SPECIFICATION Parameter Input Voltage Number of WLEDs Symbol VIN Value 2.5 to 6 5 Units V “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. EV3205DJ-00A EVALUATION BOARD Efficiency vs LED Current 88 87 86 85 84 83 82 81 80 79 78 77 4 LEDs EFFICIENCY (%) 5 LEDs 3 LEDs VIN=3.6V 5 10 15 LED CURRENT (mA) 20 MP3205-EC01 Dimensions (1.9”X x 1.8”Y x 0.4”Z) Board Number EV3205DJ-00A EV3205DJ-00A Rev. 1.1 7/13/2005 MPS IC Number MP3205DJ www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 1 TM EV3205DJ-00A – 1.3MHz FIXED FREQUENCY 5 WHITE LED DRIVER EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN D1 B0530WS-7 30V 500mA LED1 LED2 LED3 U1 IN SW LED4 LED5 OFF ON EN MP3205 FB GND EV3205_S01 EV3205DJ-00A BILL OF MATERIALS Qty 1 1 1 1 Ref C1 C2 D1 L1 LED1, LED2, LED3, LED4, LED5 R1 R2 U1 5.1Ω 22µH Value 2.2µF Description Ceramic Capacitor, 10V, X5R Diode Schottky, 30V, 0.5A Inductor, 330mA Package 0805 0805 SOD-323 D31FB Manufacturer TDK TDK Diodes Inc. Toko Manufacturer P/N C2012X5R1A225K C2012X7R1E224K B0530WS-7 984FB-220M 0.22µF Ceramic Capacitor, 25V, X7R 5 Not Stuffed 1 1 1 100kΩ Film Resistor, 5% Film Resistor, 1% Fixed Frequency, White Led Driver 0805 0805 TSOT23-5 Panasonic Panasonic MPS ERJ-6GEYJ104V ERJ-6GEYJ5R1V MP3205DJ EV3205DJ-00A Rev. 1.1 7/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 TM EV3205DJ-00A – 1.3MHz FIXED FREQUENCY 5 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 MP3205; 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. EV3205DJ-00A Rev. 1.1 7/13/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3