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| TM EV1542DK-SEPIC-00A 700KHz/1.3MHz Boost Converter with a 2A Switch EVALUATION BOARD The Future of Analog IC Technology TM GENERAL DESCRIPTION The EV1542DK-SEPIC-00A is the demo board for sepic applications using the MP1542, a current mode step up converter with a 2A, 0.18 internal switch to provide a highly efficient regulator with fast response. The EV1542DK-SEPIC-00A 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. The soft-start results in small inrush current and can be programmed with an external capacitor. The EV1542DK-SEPIC-00A can operate from a single Li-Ion battery to generate 3.3V at up to 500mA. Other features include under voltage lockout, current limiting and thermal overload protection, all available in a low profile 8-pin MSOP package. FEATURES * * * * * * * * * * * Automatic Up-Down Conversion Operates from a Single Li-Ion Battery to Generate 3.3V at up to 500mA Uses Tiny Capacitors and Inductors Pin Selectable 700KHz or 1.3MHz Fixed Switching Frequency Programmable Soft-Start UVLO, 2A Switch, Thermal Shutdown Internal Current Limit LCD Displays Portable Applications Handheld Computers and PDAs Digital Still and Video Cameras APPLICATIONS "MPS" and "Monolithic Power Systems", are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 3 - 4.2 3.3 500 Units V V mA EV1542DK-SEPIC-00A EVALUATION BOARD Efficiency vs Load Current 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 1 VIN=4.2V VIN=3.6V VIN=3V Dimensions (2.0"X x 2.0"Y x 0.0"Z) Board Number EV1542DK-SEPIC-00A MPS IC Number MP1542DK 10 100 LOAD CURRENT (mA) 1000 EV1542_EC02 EV1542DK-SEPIC-00A Rev. 1.0 www.MonolithicPower.com 6/15/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 TM EV1542DK-SEPIC-00A -- 700KHz/1.3MHz SEPIC CONVERTER WITH A 2A SWITCH EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN 3V - 4.2V GND 6 D2 1N4148 3 EN IN SW 5 T1 COOPER DRQ73-3R3 D1 1N5819HW-7 VOUT 3.3V 0.5A C2B NS EN JP1 FREQUENCY SELECTION 7 FSEL MP1542 FB 2 GND 8 SS GND COMP 1 C4 22nF U1 4 C3 1nF C6 NS EV1542-SEPIC_S01 EV1542DK-SEPIC-00A BILL OF MATERIALS Qty 2 1 1 1 1 2 1 1 1 1 1 1 1 1 2 1 Ref C1A, C1B C2A C3 C4 C5 C6, C2B C7 D1 D2 JP1 L1 R1 R2 R3 R4, R5 U1 3.3H 10k 20k Value 10F 22F 1nF 22nF 4.7F NS 1F Description Ceramic Cap, 6.3V, X5R Ceramic Cap, 6.3V, X5R Ceramic Cap, 50V, X7R Ceramic Cap, 100V, X7R Ceramic Cap, 10V, Y5V Not Stuffed Ceramic Cap, 10V, X5R Schottky Diode, 40V, 1A Rectifier Diode, 75V, 200mW 3-Pin Connector Header, 0.100 Transformer, 1.66A 0805 0805 0805 0805 MSOP8 Metal Film Resistor, 1% Metal Film Resistor, 5% DC-DC Converter 16.4k Metal Film Resistor, 1% 0805 SOD-123 SOD-323 TDK Diodes Inc Diodes Inc Sullins Cooper Panasonic Panasonic Panasonic Panasonic MPS C2012X5R1A105K 1N5819HW-7 1N4148WS-7 PTC03SAAN DRQ73-3R3 ERJ-6ENF1642V ERJ-6ENF1002V ERJ-6GEYJ203V ERJ-6GEYJ104V MP1542DK Package Manufacturer 1210 1210 0805 0805 0805 TDK TDK TDK TDK TDK Manufacturer P/N C3225X5R1A106K C3225X5R0J226M C2012X7R1H102K C2012X7R2A223M C2012Y5V1A475Z 100k Metal Film Resistor, 5% EV1542DK-SEPIC-00A Rev. 1.0 www.MonolithicPower.com 6/15/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 2 TM EV1542DK-SEPIC-00A -- 700KHz/1.3MHz SEPIC 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-SEPIC-00A Rev. 1.0 www.MonolithicPower.com 6/15/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 TM EV1542DK-SEPIC-00A -- 700KHz/1.3MHz SEPIC CONVERTER WITH A 2A SWITCH EVALUATION BOARD QUICK START GUIDE The output voltage of this board is set to 3.3V. The board layout accommodates most commonly used inductors and output capacitors. 1. Preset the power supply to 3V VIN 6V. 2. Turn the power supply off. 3. Connect the power supply terminals to: a. Positive (+): VIN, EN b. Negative (-): GND 4. Connect the load to: a. Positive (+): VOUT b. Negative (-): GND 5. Turn on the power supply 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 formula: V R1 = OUT - 1R2 V FB Where VFB = 1.25V and R2 = 10k For example, for VOUT = 5V 5V - 1 x 10k = 30k R1 = 1.25 V Therefore use a 30.1k standard 1% value. 8. The switching frequency is set to 1.3MHz if jumper JP1 is shunted at the H position. To get 700KHz operation, shunt JP1 at the L position. 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-SEPIC-00A Rev. 1.0 www.MonolithicPower.com 6/15/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 4 |
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