SP2526EB/02

SP2526 Evaluation Board Manual

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 V

and V

connections to make it easy to measure the very low quiescent current of 100

A 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.

DESCRIPTION

SP2526

Evaluation Board Manual

Easy Evaluation for the

SP2526 USB Compliant
Power Control Switch

SP2526NEB contains 2

Independent USB Power
Switches with +3.0V to
+5.5V Input Range

Low PC Board

Resistance for testing
100m

Max On

Resistance of SP2526

Evaluation Board

complete with all
capacitors & ferrite
beads to implement a
USB Compliant Power Port

Pin-to-Pin Compatible

with Micrel MIC2526

SP2526EB/02

SP2526 Evaluation Board Manual

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.

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 V

, Ground, V

OUT

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 V

, Ground and V

OUT

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

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

-- U1-7 -- Solder wire to VIN solder

pad on component side of board and connect to
external Power Supply positive. V

= +3.0V

to +5.5V. Connect Voltmeter positive or
Oscilloscope probe to V

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.

SP2526EB/02

SP2526 Evaluation Board Manual

-- Connect to a second Power Supply 5V

(or 3.3V) connection V

provides the pull-up

voltage for Enables ENA & ENB and Flags
FLGA & FLGB. This separate supply connection
allows the user to separately measure V

supply

current.

GND -- Second Power Supply GND Connection
connect to supply return for V

ENA -- U1-1 --Enable A Input must be
connected High or Low open produces
unstable behavior, so be sure to connect V

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 V

(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 V

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 V

(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

Enable A

Enable B

Number

Enable

J1 Position

J2 Position

SP2526-1

Active

1-2

High

Pull-up

SP2526-2

Active

2-3

Low

Pull-down

Table 1. Enable Jumpers J1 & J2

SP2526EB/02

SP2526 Evaluation Board Manual

SP2526EB Pin Assignments

Pin #

Pin Name

Pin Function Input/Output Pin Name

SP2526-1

ENA

Enable A Input Active High

ENA

FLGA Fault Flag A Output Active Low

FLGA

FLGB Fault Flag B Output Active Low

FLGB

ENB

Enable B Input Active High

ENB

OUTB

Switch B Output

OUTB

GND

Ground

GND

Supply Input

OUTA

Switch A Output

OUTA

SP2525-2

ENA

Enable A Input Active Low

ENA

FLGA Fault Flag A Output Active Low

FLGA

FLGB Fault Flag B Output Active Low

FLGB

ENB

Enable B Input Active Low

ENB

OUTB

Switch B Output

OUTB

GND

Ground

GND

Supply Input

OUTA

Switch A Output

OUTA

Table 2. SP2526EB PIN ASSIGNMENTS

SP2526EB/02

SP2526 Evaluation Board Manual

SP2526 Evaluation Board List of Materials

Ref.

Manuf.

Digi-Key

Layout

Vendor

Des. Qty.

Manuf.

Part Number

Size

Component

Phone Number

PCB

Sipex

146-6385-00

1.2"x1.9"

SP2526 Eval PCB

978-667-7800

Sipex

SP2526XCN

SO-8

Dual USB Switch

C1,2

Kemet

T495D157K010AS

"D" SM

6.3V 150uF Low ESR 864-963-6300

1 Panasonic

ECJ-VB1E104K

PCC1883CT-ND

1206 SM

X7R 0.1uF 25V

Digi-Key

F1-4

4 Panasonic

EXC-ELDR25C

P9819BK-ND

7.5X2.2mm

EMI Bead

800-344-4539

F1-4

4 Panasonic

EXC-ELDR35C

P9817BK-ND

9X2.2mm

EMI Bead

Digi-Key

F1-4

4 Panasonic

EXC-L351350

P9823-ND

5X3.5mm

EMI Bead

Digi-Key

F1-4

4 Panasonic

EXC-ML20A390U

P10191CT-ND

0805 SM

SM EMI Bead

Digi-Key

R1-6

6 Panasonic

ERJ-8GEYJ104

P100KECT-ND

1206 SM

100K ohm 1/8W 5%

Digi-Key

Mill-Max

3137-3002-10-0080

ED5009-ND

.042 Dia

Test Point Female Pin

Digi-Key

J1,2 2

Sullins

PZC36SAAN

S1011-36-ND

.32x.12

36-Pin (3x12) Header

Digi-Key

Sullins

STC02SYAN

S9000-ND

.2x.1

Shunt

Digi-Key

Table 3. SP2526EB LIST OF MATERIALS

SP2526EB/02

SP2526 Evaluation Board Manual

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.

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

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

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

Model

Package

SP2526-1NEB ................................................................................................. SP2526EN-1 Evaluation Board
SP2526-2NEB ................................................................................................. SP2526EN-2 Evaluation Board

ORDERING INFORMATION

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