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| SP6652EB Evaluation Board Manual High Efficiency Synchronous Step-Down Converter with up to 97% efficiency 1000mA Output Current 2.7V-5.5V Input Voltage range, Output Adjustable down to 0.8V SOIC Package & Ceramic Capacitors for small, low profile Power Supply Ideal for PDAs, Digital Cameras, Wireless Modems, Cellular Telephones DESCRIPTION The SP6652 Evaluation Board is designed to help the user evaluate the performance of the SP6652 for use as a single Li-Ion battery Step-Down DC-DC Converter. The SP6652 operates from 2.7V to 6.5V input, with the highest efficiency in the range 3.0V to 4.2V where the Li-Ion battery has the most energy. The SP6652EB evaluation board is a complete power supply circuit to provide ease of evaluation for the DC/DC Converter performance. SP6652 3.3V OUTPUT EVALUATION BOARD SCHEMATIC Rev 03/20/06 SP6652 Evaluation Board Manual Copyright Sipex Corporation USING THE EVALUATION BOARD 1) Powering up the SP6652 Circuit & Programming the UVLO threshold The SP6652 Evaluation Board can be powered from a single Li-Ion battery or a +2.7 to +5.0V power supply. Connect with short leads directly to the "Vin" and "Gnd" posts. Note the SP6652 will remain in "shutdown" until SD pin Jumper J1 is applied to the VIN position pin 1 to 2. 2) VOUT PROGRAMMING The SP6652 requires 2 feedback resistors to control the output voltage. Connect the appropriate resistors RF and RI (Table 2) from pin 3 SP6652 FB to Vout and to the GND. For Vout different from that shown in the schematic, use equation: Vout RF = - 1 * RI 0.80 SP6652EB BILL OF MATERIALS Component L1 CIN COUT CVIN Cc RVIN RI RF Rz U1 Vo = 3.3V 4.7uH, W urth Elektronik 744042004, 0.07ohm, 1.7A, 4.8x4.8x1.8mm 10uF, TDK C2012X5R0J106M, 0.005ohm, 6.3V, X5R, 0805 10uF, TDK C2012X5R0J106M, 0.005ohm, 6.3V, X5R, 0805 1uF, TDK C1608X5R0J105M, 0.03ohm, .3V, X5R, 0603 10nF ceramic, 0603 10 Ohm 5%, 0603 200k 1%, 0603 634k 1%, 0603 4.02k 1%, 0603 SP6652EU, 10 pin uSOIC 2 3) POWER SUPPLY DATA SP6652 Efficiency vs Load Vout = 3.3V 100 90 80 Efficiency (%) 70 60 50 40 30 20 10 0 1.0 10.0 100.0 1000.0 Vi=3.6V Vi=3.9V Vi=4.2V Vi=5.0V ILoad (mA) SP6652 Load Regulation, Vout = 3.3V 3.350 3.330 Vout (V) 3.310 3.290 3.270 3.250 1 10 100 1000 Vi=3.6V Vi=3.9V Vi=4.2V Vi=5.0V ILoad (mA) 3 4) EVALUATION BOARD LAYOUT SP6652EB COMPONENT PLACEMENT SP6652EB PC LAYOUT TOP SIDE SP6652EB PC LAYOUT BOTTOM SIDE 4 |
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