TM EV1542DK-00A 700KHz/1.3MHz Boost Converter with a 2A Switch The Future of Analog IC Technology TM EVALUATION BOARD GENERAL DESCRIPTION FEATURES The EV1542DK-00A is the evaluation board for the MP1542, a current mode step-up converter with a 2A, 0.18Ω internal switch to provide a highly efficient regulator with quick response. The MP1542 can be operated at 700KHz or 1.3MHz allowing for easy filtering and low noise. An external compensation pin gives the user flexibility in setting loop dynamics, which allows the use of small, low-ESR ceramic output capacitors. Soft-start results in small inrush current and can be programmed with an external capacitor. The MP1542 operates from an input voltage as low as 2.5V and can generate 12V at up to 500mA from a 5V supply. • • • The MP1542 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. The MP1542 is available in a low profile 8-pin MSOP package. • • • • • • 2A, 0.18Ω, 25V Power MOSFET Uses Tiny Capacitors and Inductors Pin Selectable 700KHz or 1.3MHz Fixed Switching Frequency Programmable Soft-Start Operates with Input Voltage as Low as 2.5V and Output Voltage as High as 22V 12V at 500mA from 5V Input UVLO, Thermal Shutdown Internal Current Limit Available in an 8-Pin MSOP Package APPLICATIONS • • • • LCD Displays Portable Applications Handheld Computers and PDAs Digital Still and Video Cameras “MPS” and “Monolithic Power Systems”, are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 2.5 – 6 8 400 V V mA EV1542DK-00A EVALUATION BOARD Efficiency vs Load Current 95 EFFICIENCY (%) 90 85 80 75 70 65 60 VIN = 3.3V VOUT = 8V 55 Dimensions (2.0”X x 2.0”Y x 0.4”Z) Board Number MPS IC Number EV1542DK-00A MP1542DK EV1542DK-00A Rev. 1.2 6/8/2005 50 1 10 100 LOAD CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 1000 MP1542-EC02 1 TM EV1542DK-00A — 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH EVALUATION BOARD EVALUATION BOARD SCHEMATIC D1 1N5819HW-7 VIN 5V JP1 1 3 2 OFF ON 6 7 3 8 5 IN FSEL EN SS VOUT 8V SW FB 2 MP1542 GND COMP 1 4 C4 10nF C3 2.2nF C5 NS EV1542_S01 EV1542DK-00A BILL OF MATERIALS Qty Ref Value Description Package 2 C1, C2 10µF Ceramic Capacitor, 10V, X7R 1210 AVX 1210ZC106KAT2A 1 C3 2.2nF Ceramic Capacitor, 50V, X7R 0805 AVX 08055C222KAT2A 1 C4 10nF Ceramic Capacitor, 50V, X7R 0805 AVX 08055C103KAT2A 1 C5 Not Stuffed 1 D1 Schottky Diodes, 40V, 1A SOD123 Diodes Inc 1N5819HW-7 1 JP1 1 L1 4.7µH 1 R1 53.6kΩ Film Resistor, 1% 2 R2, R3 10kΩ 2 R4, R5 1 U1 3-Pin Connector Header, 0.100 Manufacturer Manufacturer P/N Sullins PTC03SAAN SMD Toko A915AY-4R7M 0805 Panasonic ERJ-6ENF5362V Film Resistor, 1% 0805 Panasonic ERJ-6ENF1002V 100kΩ Film Resistor, 5% 0805 Panasonic ERJ-6GEYJ104V MSOP-8 MPS MP1542 EV1542DK-00A Rev. 1.2 6/8/2005 2.01A, D53LC DC-DC Converter www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 TM EV1542DK-00A — 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV1542DK-00A Rev. 1.2 6/8/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3 TM EV1542DK-00A — 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH EVALUATION BOARD QUICK START GUIDE The output voltage of this board is set to 8V. The board layout accommodates most commonly used inductors and output capacitors. 1. Preset Power Supply to 2.5V ≤ VIN ≤ 6V. 2. Turn Power Supply off. 3. Connect Power Supply terminals to: a. Positive (+): IN, EN b. Negative (–): GND 4. Connect Load to: a. Positive (+): OUT b. Negative (–): GND 5. Turn Power Supply on after making connections. 6. The MP1542 is enabled on the evaluation board once VIN is applied. To disable the MP1542, disconnect EN from IN. 7. The output voltage VOUT can be changed by varying R1. Calculate the new value using the fomula: ⎛V ⎞ R1 = ⎜⎜ OUT − 1⎟⎟R2 ⎝ VFB ⎠ Where VFB = 1.25V and R2 = 10kΩ For example, for VOUT = 12V ⎛ 12V ⎞ − 1⎟ × 10kΩ = 86kΩ R1 = ⎜ ⎝ 1.25 V ⎠ Therefore use an 86.6kΩ standard 1% value. For output voltages greater than 10V, the output capacitor C2 needs to be replaced with a capacitor with a higher voltage rating suitable for the new output voltage. 8. The switching frequency is set to 1.3MHz if jumper JP1 is shunted between 1 and 2. To get 700KHz operation, shunt JP1 between 2 and 3. 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. EV1542DK-00A Rev. 1.2 6/8/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 4