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| TM EV0042 1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver Evaluation Board The Future of Analog IC Technology TM GENERAL DESCRIPTION The EV0042 is an evaluation board for the MP1519, a fully automatic driver for powering four white LEDs, with up to 4V forward voltage, from a single Li-Ion or three NiMH cells. The driver performs all of the sensing and control to run the LEDs at an optimum charge pump ratio for efficiency without an expensive inductor. The driver allows PWM operation to support brightness control. The tiny 3mm x 3mm QFN16 package and small external capacitors allow for the most compact white LED solution available. FEATURES * * * * * * * * * * * * * * * * 2% LED Current Matching High Efficiency (>93%) Current Source Outputs No Ballast Resistors Required 1x, 1.5x and 2x Automatic Modes Constant Frequency Operation Automatic LED Detection High and Low Frequency PWM Capability 2.5V to 5.5V Operation Less than 1A Leakage during Shutdown Detects Changes in Battery Level No External Schottky Diode Required Soft-Start and Soft Switching Operation Cell Phones PDA or Hand Held Computers White LED Application at 3.6V Supply ELECTRICAL SPECIFICATIONS Parameter # of WLEDs Input Voltage LED Current Symbol VIN ILED Value 4 2.5 - 5.5 20 Units V mA APPLICATIONS "MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc. EV0042 EVALUATION BOARD Efficiency vs Supply Voltage 100 90 80 EFFICIENCY (%) VLED = 3.35V @ 20mA ILED=5mA ILED=20mA 70 60 50 40 30 20 10 0 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) 4.5 ILED=10mA (L x W x H) 2.4" x 1.9" x 0.4" (6.1cm x 4.8cm x 1.0cm) Board Number EV0042 MPS IC Number MP1519DQ MP1519-EC01 EV0042 Rev. 1.5 10/27/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 TM EV0042 - 1X, 1.5X, 2X CHARGE PUMP 4 WHITE LED DRIVER EV BOARD EVALUATION BOARD SCHEMATIC TP1 LED1 LED2 LED3 LED4 VIN U1 16 15 14 13 LED3 LED2 LED1 1 2 BATT LED4 NC EN RADJ 12 11 10 9 GND 3 4 MP1519 GND C1A GND C2B 5 6 7 EN Note: Attach the exposed pad to the LEDC pin. EV0042_S01 EV0042 BILL OF MATERIALS Qty 2 2 Ref C1, C2 C3, C4 LED1, LED2, LED3, LED4 R1 R2 R3, R4, R5, R6 U1 Value Description 1F Ceramic Capacitor, 10V, X5R Package 0805 0805 Manufacturer: Part No. TDK: C2012X5R1A105K TDK: C2012X5R0J475K Distributor: Part No. Digikey: 445-1360-1-ND Digikey: 445-1421-1-ND 4.7F Ceramic Capacitor, 6.3V, X5R 4 Not Stuffed Panasonic: ERJ-6ENF1541V Panasonic: ERJ-6GEYJ104V Yageo: 9C08052A0R00JLHFT MPS: MP1519DQ Digikey: P1.54KCCT-ND Digikey: P100KACT-ND Digikey: 311-0.0ACT-ND 1 1 4 1 1.54k Resistor, 1% 100k Resistor, 5% 0 Resistor, 5% White LED Driver 0805 0805 0805 EV0042 Rev. 1.5 10/27/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. LEDC 8 BATT C2A C1B 2 TM EV0042 - 1X, 1.5X, 2X CHARGE PUMP 4 WHITE LED DRIVER EV BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 4--Bottom Layer QUICK START GUIDE 1. Solder LED1 - LED4 to the board. 2. Attach the positive and negatives terminals of the power supply (2.5V - 5.5V) to the VIN and GND pins, respectively. 3. The board is set up for automatic startup. Drive EN low to shut down the MP1519. 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. EV0042 Rev. 1.5 10/27/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 |
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