TM EV1517DR-00B 3.3V, 1A Sepic Evaluation Board The Future of Analog IC Technology TM GENERAL DESCRIPTION FEATURES 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. • Provides 3.3V, 1A Output from as Low as 3V Input Over 80% Efficiency Inherent Output Disconnect at Shutdown Mode 1.1MHz Switching Frequency 0.5µA Shutdown Current Fully Assembled and Tested • • • • • APPLICATIONS • • • • Boost and SEPIC Regulators Handheld Computers Cell Phone Camera Flash, PDAs Digital Still and Video Cameras “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 Value Units VIN VOUT IOUT 3-4.2 3.3 1 V V A EV1517DR-00B EVALUATION BOARD Efficiency vs Load Current 90 EFFICIENCY (%) 80 VIN=4.2V 70 VIN=3V 60 VIN=3.6V 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 MPS IC Number EV1517DR-00B MP1517DR EV1517DR-00B Rev. 1.0 12/21/2005 0 1 10 100 1000 LOAD CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. MP1517-EC01 1 TM EV1517DR-00B – 3.3V, 1A SEPIC EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN 3V - 4.2V GND U1 4 EN D2 1N4148 8 IN SW EN GND SW 15 SS C4 10nF MP1517 3 FB BP C5 10nF COMP 7 OLS SGND SGND 5 13 VOUT 10 3.3V/1A D1 B340A-13 3A 9 GND 16 1 PGND PGND 11 T1 DRQ125-3R3 12 C3 4.7nF C6 NS EV1517_S01 EV1517DR-00B BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Manufacturer P/N 2 C1A, C1B 10µF Ceramic Cap, 6.3V, X5R 1210 TDK 2 C2A, C2B 22µF Ceramic Cap, 6.3V, X7R 1210 TDK 1 C3 0805 Panasonic 2 C4, C5 4.7nF Ceramic Cap, 50V, X7R 10nF Ceramic Cap, 50V, X7R 0805 TDK C3225X5R1A106K C3225X5R0J226M ECJ-2VB1H472K C2012X7R1H103K 1 C6 1 C7 Ceramic Cap, 10V, X5R 0805 TDK C2012X5R1A105K 1 C8 4.7uF Ceramic Cap, 10V, X5R 0805 Panasonic ECJ-2FB1A475K 1 D1 Diodes Inc B340LA-13-F 1 D2 1 R1 1 R2 1 R3 1 R4 5.1KΩ Film Resistor, 5% 100KΩ Film Resistor, 5% 1 T1 3.3uH Coupled Inductors, 4.63A, SMD 1 U1 Do Not Stuff 1uF Schottky Diode, 40V, 3A, SMA Rectifier Diode, 75V, 200mW, SOD-323 37.4KΩ Film Resistor, 1% 10KΩ Film Resistor, 1% EV1517DR-00B Rev. 1.0 12/21/2005 DC-DC Converter Diodes Inc 1N4148WS-7 0805 Panasonic ERJ-6ENF3742V 0805 Panasonic ERJ-6ENF1002V 0805 Panasonic ERJ-6GEYJ512V 0805 Panasonic ERJ-6GEYJ104V Cooper DRQ125-3R3 MPS MP1517DR www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 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. © 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 − 1⎟⎟R2 ⎝ VFB ⎠ Where VFB = 0.7V and R2 = 10kΩ For example, for VOUT = 3.6V ⎛ 3 .6 V ⎞ − 1⎟ × 10kΩ = 41.4kΩ R1 = ⎜ ⎝ 0 .7 V ⎠ Therefore use a 41.2kΩ 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. © 2005 MPS. All Rights Reserved. 4