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| TM EV1517DR-00B 3.3V, 1A Sepic Evaluation Board The Future of Analog IC Technology TM GENERAL DESCRIPTION The EV1517DR-00B is a MP1517 evaluation board that is configured to provide a regulated 3.3V output at up to 1A from a 3V to 4.2V input. The output voltage is adjustable by changing resistors on the evaluation board. The high 1.1MHz switching frequency allows for smaller external components producing a compact solution for a wide range of load currents. Soft-start, cycle-by-cycle current limiting, and input under voltage lockout prevent overstressing or damage to sensitive external circuitry at startup and output short-circuit conditions. Current-mode regulation and external compensation components allow the MP1517 control loop to be optimized over a wide variety of input voltage, output voltage, and load current conditions. FEATURES * * * * * * * * * * Provides 3.3V, 1A Output from as Low as 3V Input Over 80% Efficiency Inherent Output Disconnect at Shutdown Mode 1.1MHz Switching Frequency 0.5A Shutdown Current Fully Assembled and Tested Boost and SEPIC Regulators Handheld Computers Cell Phone Camera Flash, PDAs Digital Still and Video Cameras APPLICATIONS "MPS" and "The Future of Analog IC Technology", are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 3-4.2 3.3 1 Units V V A EV1517DR-00B EVALUATION BOARD Efficiency vs Load Current 90 80 VIN=4.2V VIN=3V VIN=3.6V EFFICIENCY (%) 70 60 50 40 30 20 10 (L x W x H) 2.0" x 2.0" x 0.4" (5cm x 5cm x 1cm) Board Number EV1517DR-00B MPS IC Number MP1517DR 0 1 10 100 1000 MP1517-EC01 LOAD CURRENT (mA) EV1517DR-00B Rev. 1.0 12/21/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 TM EV1517DR-00B - 3.3V, 1A SEPIC EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN 3V - 4.2V GND U1 EN GND 15 SS 4 EN 8 IN SW SW 10 9 D2 1N4148 T1 DRQ125-3R3 VOUT 3.3V/1A D1 B340A-13 3A GND C4 10nF 3 BP MP1517 FB 16 C5 10nF 7 OLS SGND SGND 5 13 COMP 1 PGND PGND 11 12 C3 4.7nF C6 NS EV1517_S01 EV1517DR-00B BILL OF MATERIALS Qty 2 2 1 2 1 1 1 1 1 1 1 1 1 1 1 Ref C1A, C1B C2A, C2B C3 C4, C5 C6 C7 C8 D1 D2 R1 R2 R3 R4 T1 U1 1uF Value Description 10F 22F Ceramic Cap, 6.3V, X5R Ceramic Cap, 6.3V, X7R Package Manufacturer Manufacturer P/N 1210 1210 0805 0805 0805 0805 TDK TDK Panasonic TDK TDK Panasonic Diodes Inc Diodes Inc 0805 0805 0805 0805 Panasonic Panasonic Panasonic Panasonic Cooper MPS 4.7nF Ceramic Cap, 50V, X7R 10nF Ceramic Cap, 50V, X7R Do Not Stuff Ceramic Cap, 10V, X5R Schottky Diode, 40V, 3A, SMA Rectifier Diode, 75V, 200mW, SOD-323 37.4K Film Resistor, 1% 10K Film Resistor, 1% 5.1K Film Resistor, 5% 100K Film Resistor, 5% 3.3uH Coupled Inductors, 4.63A, SMD DC-DC Converter C3225X5R1A106K C3225X5R0J226M ECJ-2VB1H472K C2012X7R1H103K C2012X5R1A105K ECJ-2FB1A475K B340LA-13-F 1N4148WS-7 ERJ-6ENF3742V ERJ-6ENF1002V ERJ-6GEYJ512V ERJ-6GEYJ104V DRQ125-3R3 MP1517DR 4.7uF Ceramic Cap, 10V, X5R EV1517DR-00B Rev. 1.0 12/21/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 2 TM EV1517DR-00B - 3.3V, 1A SEPIC EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3--Bottom Layer EV1517DR-00B Rev. 1.0 12/21/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 TM EV1517DR-00B - 3.3V, 1A SEPIC EVALUATION BOARD QUICK START GUIDE The output voltage of this board is set to 12V. The board layout accommodates most commonly used inductors and output capacitors. 1. Preset Power Supply to 3V VIN 4.2V. 2. Turn Power Supply off. 3. Connect Power Supply terminals to: Positive (+): VIN, EN Negative (-): GND 4. Connect Load to: Positive (+): VOUT Negative (-): GND 5. Turn Power Supply on after making connections. 6. The MP1517 is enabled on the evaluation board once VIN is applied. To disable the MP1517, disconnect EN from VIN. 7. The output voltage VOUT can be changed by varying R1. Calculate the new value using the formula: V R1 = OUT - 1R2 V FB Where VFB = 0.7V and R2 = 10k For example, for VOUT = 3.6V 3 .6 V - 1 x 10k = 41.4k R1 = 0 .7 V Therefore use a 41.2k standard 1% value resistor. 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. EV1517DR-00B Rev. 1.0 12/21/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 4 |
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