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SP2526
Evaluation Board Manual
s Easy Evaluation for the
SP2526 USB Compliant Power Control Switch
s SP2526NEB contains 2
Independent USB Power Switches with +3.0V to +5.5V Input Range
s Low PC Board
Resistance for testing 100m Max On Resistance of SP2526
s Evaluation Board
complete with all capacitors & ferrite beads to implement a USB Compliant Power Port
s Pin-to-Pin Compatible
with Micrel MIC2526
DESCRIPTION The SP2526 Evaluation Board is designed to help the user evaluate the performance of the SP2526 for use as a dual +3.0V to +5.5V USB Supervisory Control Switch. Each channel of the SP2526 can be evaluated for its low on-resistance and capacity to supply 500mA output current. The SP2526 Evaluation Board is designed with independent VDD and VIN connections to make it easy to measure the very low quiescent current of 100A maximum, and low PC board resistance for evaluating the very low on-resistance of 100m maximum. The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP2526 Inputs and Outputs so that the user can quickly connect and measure electrical characteristics and waveforms.
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SP2526 EVALUATION BOARD
The next two sections describe the SP2526 Board Layout and Using the SP2526 Evaluation Boards. A table of SP2526 Pin Assignments is also included with details on Input/Output pin function. A SP2526 Evaluation Board List of Materials table is provided with some manufacturers part numbers to use as a reference. Finally, a schematic and drawings of the PC Board Layout are included of the SP2526 Evaluation Board.
per input or output connection versus using surface-mount size 0805 ferrite beads which yielded 5m per input or output connection.
USING THE EVALUATION BOARD
The SP2526 Evaluation Board can be connected to a power supply using a pair of wires soldered to the solder pads marked provided "VIN" and "GND". It is good practice to not switch power on until power connections are made to the evaluation board. Powering Up & Using the SP2526 Circuit VIN -- U1-7 -- Solder wire to VIN solder pad on component side of board and connect to external Power Supply positive. VIN = +3.0V to +5.5V. Connect Voltmeter positive or Oscilloscope probe to VIN test point post to monitor actual voltage input to PC board. GND -- U1-6 -- Solder wire to GND solder pad on component side of board and connect to external Power Supply negative. Connect Voltmeter negative or Oscilloscope probe ground to GND test point post to monitor actual voltage input to PC board. OUTA -- U1-8 -- Solder wire to OUTA solder pad on component side of board and connect to external load. Connect Voltmeter positive or Oscilloscope probe to OUTA test point post to monitor actual voltage output at the PC board. GNDA -- Solder wire to GNDA solder pad on component side of board and connect to external LoadA return. Connect Voltmeter negative or Oscilloscope probe ground to GND test point post to monitor actual voltage input to PC board. OUTB -- U1-5 -- Solder wire to OUTB solder pad on component side of board and connect to external load. Connect Voltmeter positive or Oscilloscope probe to OUTB test point post to monitor actual voltage output at the PC board. GNDB -- Solder wire to GNDB solder pad on component side of board and connect to external LoadB return. Connect Voltmeter negative or Oscilloscope probe ground to GND test point post to monitor actual voltage input to PC board.
(c) Copyright 2000 Sipex Corporation
BOARD LAYOUT
The SP2526 Evaluation Board has been designed to easily and conveniently provide access to all Inputs and Outputs of the SP2526 device under test. Position the board with the silkscreen lettering upright (see Figure 1 Component Layout) and you will see the SP2526 SOIC labeled U1 in the center right of the board, and around it the Capacitors C1,2,3 and Ferrite Beads F1-4 forming the Dual USB Supervisory Switch. The SP2526 Evaluation Board provides solder pads to connect wires to an external power supply and load, as well as Test Point Posts to monitor the Input and Output Voltages at these connections to the SP2526. The SP2526 PC Board Layout has been designed with low resistance input and output connections of 2m each to provide the lowest On-Resistance for utilizing the USB Switch. The PC Layout is given in Figures 1-3 for the user as an aid in designing a low resistance USB switch on a PC board. The PC board used has 1oz Copper with VIN, Ground, VOUT traces of at least 0.1inch width for 5m/inch or looked at another way as 0.5m/square. This means to maintain a trace resistance of only 2m, you need to have only 4 squares of trace from one end to another. Resistance is further reduced by some additional wide VIN, Ground and VOUT connections on the bottom side of the PC board which are connected to the top side with large through-hole connections. For best results with on-resistance in the ferrites used for EMI suppression in the Output and Ground connections, through-hole ferrite beads were used for F1-4, yielding 2m
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VDD -- Connect to a second Power Supply 5V (or 3.3V) connection - VDD provides the pull-up voltage for Enables ENA & ENB and Flags FLGA & FLGB. This separate supply connection allows the user to separately measure VIN supply current. GND -- Second Power Supply GND Connection - connect to supply return for VDD. ENA -- U1-1 --Enable A Input must be connected High or Low - open produces unstable behavior, so be sure to connect VDD to an external 3.3V or 5V source. See Table 1 Enable Jumpers for information on Enable Jumper J1 position. The user can actively control Switch A with an external Logic signal. FLGA -- U1-2 -- Flag A output is open drain and has a pull-up to VDD (which should be connected to an external source). Connect FLGA to voltmeter or oscilloscope to monitor Switch A for flags when Low if Under-voltage, Over-current or Over-temperature occurs. . ENB -- U1-4 -- Enable B Input must be connected High or Low - open produces unstable behavior, so be sure to connect VDD to an external 3.3V or 5V source. See Table 1 Enable Jumpers for information on Enable Jumper J2 position. The user can actively control Switch B with an external Logic signal. FLGB -- U1-3 -- Flag B output is open drain and has a pull-up to VDD (which should be connected to an external source). Connect FLGB to voltmeter or oscilloscope to monitor Switch B for flags when Low if Under-voltage, Over-current or Over-temperature occurs.
Using the Enable Jumbers J1 & J2 The jumpers J1& J2 have 2 positions, as described below. Connecting a logic level to the ENA or ENB test point post will override the pull-up or pull-down to actively control the switch.
Part Number SP2526-1 SP2526-2 Enable Active High Active Low Enable A J1 Position 1-2 Pull-up 2-3 Pull-down Enable B J2 Position 1-2 Pull-up 2-3 Pull-down
Table 1. Enable Jumpers J1 & J2
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Table 2. SP2526EB PIN ASSIGNMENTS
SP2526EB Pin Assignments Pin # Pin Name Pin Function SP2526-1 1 2 3 4 5 6 7 8 ENA FLGA FLGB ENB OUTB GND IN OUTA Enable A Input Active High Fault Flag A Output Active Low Fault Flag B Output Active Low Enable B Input Active High Switch B Output Ground Supply Input Switch A Output SP2525-2 1 2 3 4 5 6 7 8 ENA FLGA FLGB ENB OUTB GND IN OUTA Enable A Input Active Low Fault Flag A Output Active Low Fault Flag B Output Active Low Enable B Input Active Low Switch B Output Ground Supply Input Switch A Output ENA FLGA FLGB ENB OUTB GND VIN OUTA ENA FLGA FLGB ENB OUTB GND VIN OUTA Input/Output Pin Name
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Table 3. SP2526EB LIST OF MATERIALS
SP2526 Evaluation Board List of Materials Ref. Des. Qty. PCB U1 C1,2 C3 F1-4 F1-4 F1-4 F1-4 R1-6 TP J1,2 1 1 2 Manuf. Sipex Sipex Kemet Manuf. Part Number 146-6385-00 SP2526XCN T495D157K010AS ECJ-VB1E104K EXC-ELDR25C EXC-ELDR35C EXC-L351350 EXC-ML20A390U ERJ-8GEYJ104 3137-3002-10-0080 PZC36SAAN STC02SYAN Digi-Key Part Number PCC1883CT-ND P9819BK-ND P9817BK-ND P9823-ND P10191CT-ND P100KECT-ND ED5009-ND S1011-36-ND S9000-ND Layout Size 1.2"x1.9" SO-8 "D" SM 1206 SM 7.5X2.2mm 9X2.2mm 5X3.5mm 0805 SM 1206 SM .042 Dia .32x.12 .2x.1 Component SP2526 Eval PCB Dual USB Switch 6.3V 150uF Low ESR 864-963-6300 X7R 0.1uF 25V EMI Bead EMI Bead EMI Bead SM EMI Bead 100K ohm 1/8W 5% Test Point Female Pin 36-Pin (3x12) Header Shunt Digi-Key 800-344-4539 Digi-Key Digi-Key Digi-Key Digi-Key Digi-Key Digi-Key Digi-Key Vendor Phone Number 978-667-7800
1 Panasonic 4 Panasonic 4 Panasonic 4 Panasonic 4 Panasonic 6 Panasonic 12 2 2 Mill-Max Sullins Sullins
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SP2526 Evaluation Board Schematic
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Figure 1. SP2526NEB Component Placement
Figure 2. SP2526NEB PC Layout Component Side
Figure 3. SP2526NEB PC Layout Soldier Side
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ORDERING INFORMATION
Model Package SP2526-1NEB ................................................................................................. SP2526EN-1 Evaluation Board SP2526-2NEB ................................................................................................. SP2526EN-2 Evaluation Board
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 European Sales Offices: GERMANY: Sipex GmbH Gautinger Strasse 10 82319 Starnberg TEL: 49.81.51.89810 FAX: 49.81.51.29598 e-mail: sipex-starnberg@t-online.de Far East: JAPAN: Nippon Sipex Corporation Yahagi No. 2 Building 3-5-3 Uchikanda, Chiyoda-ku Tokyo 101, Japan TEL: 011.81.3.3256.0577 FAX: 011.81.3.3256.0621
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
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