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| EV0077 (MP1541) 1.3MHz Low Power Boost Converter Monolithic Power Systems EVALUATION BOARD - INITIAL RELEASE GENERAL DESCRIPTION The EV0077 Evaluation Board is designed to demonstrate the capabilities of MPS' MP1541. The MP1541 is a 5-pin thin SOT23 current mode step up converter intended for small, low power applications. The MP1541 switches at 1.3MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft start results in small inrush current and extends battery life. The MP1541 operates from an input voltage as low as 2.5V and can generate 12V at up to 200mA from a 5V supply. The MP1541 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The MP1541 is available in a small 5-pin TSOT23 package. FEATURES * * * * * * * * * * * * * * * * On Board Power MOSFET Uses Tiny Capacitors and Inductors 1.3MHz Fixed Switching Frequency Internally Compensated Internal Soft Start Operates with Input Voltage as Low as 2.5V and Output Voltage as High as 22V 12V at 200mA from 5V Input UVLO, Thermal Shutdown Internal Current Limit Available in a TSOT23-5 Package Camera Phone Flash Handheld Computers and PDAs Digital Still and Video Cameras External Modems Small LCD Displays White LED Driver APPLICATIONS ELECTRICAL SPECIFICATION Parameter Supply Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 2.5 - 6 12 0.2 Units V V A , "MPS", "Monolithic Power Systems", and "The Future of Analog IC Technology" are Registered Trademarks of Monolithic Power Systems, Inc. EV0077 EVALUATION BOARD Efficiency vs Load Current 100 95 90 VIN = 5V EFFICIENCY (%) 85 80 75 70 65 60 55 50 VIN = 3.3V VIN = 4.2V (2.5"X x 2.5"Y x 0.8"Z) Board Number EV0077 Rev. A MPS IC Number MP1541 0 75 150 225 300 375 450 LOAD CURRENT (mA) EV0077_MP1541_PC01 06/04, Rev. 1.0 www.MonolithicPower.com 1 EV0077 (MP1541) 1.3MHz LOW POWER BOOST CONVERTER EVALUATION BOARD - INITIAL RELEASE EVALUATION BOARD SCHEMATIC D1 MBR0520L VOUT 12V 200mA VIN 5V GND 5 1 SW GND EN 4 2 IN EN GND C3 100pF 3 MP1541 FB EV0077_MP1541_SCH01 EV0077 BILL OF MATERIALS Qty 1 1 1 1 1 1 2 1 1 1 Ref C1 C2 C3 D1 L1 U1 R1, R2 R5 R3 R4 Description Ceramic Capacitor, 10F, 10V, X5R, 1210 Ceramic Capacitor, 4.7F, 16V, X7R, 1210 Ceramic Capacitor, 100pF, 50V, NPO Schottky Diode, 0.5A, 20V, SOD-123 Inductor, 10H, 1.7A 1.3MHz Boost Converter, SOT23-5 Resistor, 100k, 5%, 0603 Resistor, 10k, 5%, 0603 Resistor, 102k, 1%, 0603 Resistor, 11.8k, 1%, 0603 Manufacturer P/N Panasonic: ECJ-4YB1A106K Panasonic: ECJ-4YB1C475K Panasonic: ECJ-2VC1H101J Fairchild: MBR0520L Sumida: CDRH6D28-100NC MPS: MP1541 Panasonic: ERJ-6GEYJ104V ERJ-6GEYJ103V Panasonic: ERJ-6ENF1023V Panasonic: ERJ-6ENF1182V Distributor P/N (1) PCC2170CT-ND PCC2168CT-ND PCC101CGCT-ND MBR0520LCT-ND P100KACT-ND P10KACT-ND P102KCCT-ND P11.8KCCT-ND Note 1) Distributor: Digikey 06/04, Rev. 1.0 www.MonolithicPower.com 2 EV0077 (MP1541) 1.3MHz LOW POWER BOOST CONVERTER EVALUATION BOARD - INITIAL RELEASE PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3-- Bottom Layer 06/04, Rev. 1.0 www.MonolithicPower.com 3 EV0077 (MP1541) 1.3MHz LOW POWER BOOST CONVERTER EVALUATION BOARD - INITIAL RELEASE 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 2.5V VIN 6V. 2. Turn Power Supply off. 3. Connect Power Supply terminals to: a. Positive (+): VIN b. Negative (-): GND 4. Connect Load to: a. Positive (+): VOUT b. Negative (-): GND 5. Turn Power Supply on after making connections. 6. The MP1541 is automatically enabled on the evaluation board once VIN is applied. To disable the MP1541, connect the EN pin to ground. 7. The output voltage VOUT can be changed by varying R3. Calculate the new value using the fomula: V R3 = OUT - 1R 4 V FB where VFB = 1.25V and R4 = 11.8k For example, for VOUT = 8V 8V R3 = - 1 x 11.8k = 63.72k 1.25 V Therefore use a 63.4k standard 1% value. NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Contact MPS for current specifications. MPS encourages users of its products to ensure that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS cannot assume any legal responsibility for any said applications. EV0077 (MP1541) Rev. 1.0 6/10/04 (c) 2004 MPS, Inc. Monolithic Power Systems, Inc. 983 University Avenue, Building A, Los Gatos, CA 95032 USA Tel: 408-357-6600 Fax: 408-357-6601 www.MonolithicPower.com 4 |
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