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| SP6231EB Evaluation Board Manual Easy Evaluation for the SP6231 Linear Regulator with Auxiliary Backup. Evaluation Board provides complete, ready to use solutions ideal for Digital Still Camera (DSC) with USB port. 5.0 In, 3.3V Out, 500mA LDO. Integrated Auxiliary Voltage Switch 0.2. Glitch Free Transition between Two Supplies: Battery or USB downloading. Current Limit and Thermal Shutdown Protection. Fast Transient Response. Applications: DSC, PCMCIA/PCI cards, NIC Cards, Dual Power Systems. DESCRIPTION The SP6231 Evaluation Board is designed to help the user evaluate the performance of the SP6231 for use as a dual power source for applications like a DSC with USB port power for downloading. The Evaluation Board operates from a 5V main supply which can be from the on-board USB connector, providing a regulated 3.3V output at 500mA or if that input is not present then from a 3.3V AUX switch input. The 3.3V AUX input is available from an on-board option: Sipex's SP6641B 2 Cell Battery Boost Converter to 3.3V auxiliary supply. The SP6231 Evaluation Board can be used to provide glitch free transition between two supplies. When the main power 5.0V input drops below 4.4V the auxiliary 3.3V is switched to the output through the internal PFET. Thus, the SP6231 guarantees 3.3V output "glitch free" operation. SP6231REB SCHEMATIC SP6231 500MA LDO WITH AUX SWITCH VIN 5V J2 USB CONNECTOR 1 2 3 4 A MP# 7876 16 +5V GND J1 SHDN 1 2 3 4 SP6641B 2 CELL BOOST U1 SP6641B SHDN V OUT GND 5 V BATT LX 3 2 1 6641 3.3V VAUX U2 SP6231 C3 2.2uF Cer. 1uF Cer. C6 L2 SM Bead VOUT 3.3V 1 V A UX GND GND V out V in V sense 6 5 4 2 3 C2 100uF 80mohm D1 C5 0.1uF C4 10uF Cer. VBATT 1.8V to 3.3V C1 100uF 80mohm L1 10uH SCHOTTKY DIODE Rev 09/24/02 SP6231 Evaluation Board Manual Copyright Sipex Corporation USING THE EVALUATION BOARD To power up the SP6231 evaluation board, connect +5.0Vin (or use the USB connector) to the Vin 5V post and GND located on the top right corner of the SP6231 evaluation board. Connect +3.3V Auxiliary Power to the VAUX 3.3V post and GND pin near the U2 IC. An alternative 3.3VAUX input to U2 is to use U1, the SP6641B DC/DC converter located on the left side of the Board. The SP6641B boost converter can provide 3.3V out from a Battery input of 1.0V @ 150mA or 2.0V @ 400mA for the 3.3VAUX (see figure 3 for SP6641B maximum load current curve). Just connect the Battery voltage input to the VBATT and GND posts. The SHDN connector J1 can be used to enable or disable the SP6641B. If the SP6641B is not used the wire jumper J2 can be removed and the VAUX 3.3V input alone should be used. Low voltage start up voltage for the SP6641B is around 0.9V at light load RL=3.0K. Connect the Load to the pins Vout 3.3V and GND on the right side of the Board. EVALUATION BOARD DATA Vin Vout Vaux Iout Vout FIGURE 2. Switching: Vaux to Vin to Vaux Vin = 5V, Vaux = 3.3V, Iout = 300mA Ch1 = Vin Ch2 = Vaux (AC)(SP6641B 3.3Vo, 2.6Vin) Ch3 = Vout (AC) Figure 3. SP6641B Maximum Load Current in Operation 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 1.0 1.5 2.0 Vin (V) 2.5 3.0 FIGURE 1. Vout for 500mA Load Step Vin = 5V Supply Ch1 = Vout (AC) Ch4 = Iout 500mA/div Io (mA) 2 PC LAYOUT DRAWING FIGURE 4. SP6231REB COMPONENT PLACEMENT FIGURE 5. SP6231REB PC LAYOUT TOP SIDE FIGURE 6. SP6231REB PC LAYOUT BOTTOM SIDE 3 SP6231 EVALUATION BOARD BILL OF MATERIALS Ref. Des. Qty. 1 1 1 2 1 1 1 1 1 1 1 9 1 1 1 1 Manufacturer Sipex Corp. Sipex Corp. Sipex Corp. Sanyo Video TDK TDK TDK TDK Sumida TDK Zetex Mill-Max Sullins Assmann Sullins Part Number 146-6447-03 SP6641BEK-3.3 SP6231ER-3.3 10TPA100M C2012X5R1A225M C3216X5R0J106M C1608X7R1E104M C2012X5R1A105M CDRH5D28-100 MPZ2012S300A ZCHS1000 or ZCHS2000 0300-115-01-4727100 PTC36SAAN AU-Y1005 STC02SYAN Layout Size Component LxWxH 1"x1.5" SP6641 Eval PC Board SOT23-5 5-pin SOT23 Step-Up DC/DC Conv 6 Pin MLP 500mA 3.3V LDO with AUX Input 7343 6.3V 100uF SMT POSCAP 0.080ohm ESR 805 Ceramic 6.3V 2.2uF SM 0.02ohm ESR 1206 Ceramic 6.3V 10uF SM 0.01ohm ESR 603 Ceramic 0.1uF SM 0.05ohm ESR 805 Ceramic 6.3V 1uF SM 0.03ohm ESR 5.7x5.5x3mm 10uH, 1.3A, 0.065ohm, SM Inductor 805 SM Bead Core 100MHz SOT23-6 Schottky diode 1A or 2A, 0.4V .042 Dia Test Point Female Pin .23x.12 3-Pin Header 13x14x7mm USB 4P Female Rt Angle DIP Type A Conn. Jumper Wire .2x.1 Shunt Vendor Sipex 978-667-8700 Sipex Sipex Sanyo 978-922-6573 TDK 847-803-6100 TDK 847-803-6100 TDK 847-803-6100 TDK 847-803-6100 Sumida 847-956-0666 TDK 847-803-6100 Zetex 631-360-2222 800-Digi-Key 800-Digi-Key 800-Digi-Key 800-Digi-Key U1 U2 C1,C2 C3 C4 C5 C6 L1 L2 D1 TP J1 J2 J3 ORDERING INFORMATION Model Temperature Range Package Type SP6231EB............................. -40C to +85C......................SP6231EB Evaluation Board SP6231ER............................. -40C to +85C...................................................6 Pin DFN SP6231EN............................. -40C to +85C...............................................8 Pin NSOIC 4 |
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