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Semtech SC33021 Evaluation Board User guide

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© 2015 Semtech Corporation
POWER MANAGEMENT
1
SC33021 EVB
Evaluation Board
User’s Guide
Description
The SC33021 is an integrated 2A Load Switch with reverse
current blocking which operates from a 1.6V to 5.5V input
supply.
The SC33021 is oered in tiny 0.9mm x 0.9mm x 0.6mm, 4
Bump CSP package enabling very small board area imple-
mentations. The SC33021 has an operating ambient
temperature range of -40 °C to +85 °C.
This guide contains information on how to use the EVB
and should be used in conjunction with the datasheet.
The datasheet contains detailed information including the
electrical characteristics, operating procedures, circuit
design procedures, a typical application circuit, and other
application information.
This guide is intended to help the user to become familiar
with the features of the device. This EVB has many test
points and jumper in order to access various parameters
and circuit capabilities. Users can eliminate these test
points and jumpers to simplify the circuit for a specic
application.
Revision 2.0
Jumper Settings
Operation
Schematic
Bill of Materials
Layout
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SC33021EVB — R2
SC33021 EVB
2
Jumper Settings
J1 — Enable
ON — Connect pins 1-2
OFF — Connect pins 2-3
VOUT Measurement
T2 — VOUT
J2 — VIN Connector
VIN Measurement
T1 — VIN
J3 — VOUT Connector
SC33021
SC33021 EVB
3
Operation
Check the jumper settings per the above
illustration.
Connect a 5.5V or less power supply at the
proper polarity to the input voltage connection
(J2). The lead between the Power supply and J2
as short as possible.
Connect an output load to the output voltage
connection (J3). The lead between the output
load and J3 as short as possible.
Connect a voltage meter to T1 for VIN sense
measurement.
Connect a voltage meter to T2 for VOUT sense
measurement.
Both T1 and T2 test points are Kelvin connec-
tions which can be used to minimize R
ON
.
The SC33021 EVB shipped in disable position.
Place the EN jumper (J1) in the ON position to
enable the output.
Shutdown
The SC33021 can be shutdown o by pulling EN below
its threshold.
Reverse Blocking
A comparator is used to sense and compare the
VOUT voltage to the VIN voltage, when VOUT -
VIN > 40mV minimum with EN=high, the Reverse
Blocking circuit is triggered and reverse current
is blocked from VOUT to VIN.
The EN is changed from high to low, there is only
slight reverse leakage current, and the maximum
is 3uA at room temperature.
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SC33021 EVB
4
EVB Schematic
10
10
9
9
8
8
7 6
6
5 4
4
3
3
2
2
1
1
J J
I I
H H
G G
F F
E E
D D
C C
B B
A A
GND
GND
Vin Vout
GND
EN
EN
J2 J3
U1
SC33021
U1
SC33021
VIN
A2
OUT
A1
GND
B1
EN
B2
T2T2
+
C3
N.P.
+
C3
N.P.
C2
1uF
C2
1uF
J1J1
1
2
3
C1
1uF
C1
1uF
T1T1
1
2
3
4
1
2
3
4
5
SC33021 EVB
5
Bill of Materials
Reference
(1)
Description Part Manufacturer Package
C1 GRM188R71A105KA61D 1uF Murata SM_0603
C2 GRM188R71A105KA61D 1uF Murata SM_0603
J1 620 010 111 21 EN Wurth Elektronik EN
J2 620 010 111 21 VIN Wurth Elektronik VIN
J3 620 010 111 21 VOUT Wurth Elektronik VOUT
U1
2A Load Switch with
Reverse Current Blocking
SC33021 Semtech
0.9mm*0.9mm 4
Bump CSP
Note:
(1) Critical components for customer’s design are in bold type.
SC33021 EVB
6
Layout Drawings — Top Components and Copper Layer
DBN461!W!21/6!;!Uiv!Kvo!15!21;65;68!3126!.!)Voujumfe*
SC33021 EVB
7
Layout Drawings — Bottom Layer
DBN461!W!21/6!;!Uiv!Kvo!15!21;66;43!3126!.!)Voujumfe*
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
Contact Information
SC33021 EVB
8
© Semtech 2015
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