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Semtech SC3303 Evaluation Board User guide

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© 2011 Semtech Corporation
POWER MANAGEMENT
1
SC3303 EVB
Evaluation Board
User’s Guide
Description
SC3303 EVB provides one 3A integrated MOSFET regula-
tor with LDO. The EVB is designed to provide a working
demonstration of the SC3303.
This guide contains information on how to use the EVB
and should be used in conjunction with the datasheet for
the device. The datasheet contains detailed information
including the electrical characteristics, operating proce-
dures, circuit design procedures, a typical application
circuit, and other application information.
This guide helps the user to get familiar with the features
of the device. The procedures used to begin EVB operation
are provided. This EVB has many test points and jumpers
in order to access various parameters and circuit capabili-
ties. The user’s can eliminate these test points and jumpers
to simplify the circuit for a specic application.
Revision 2.0
Feature Content
Jumper Settings
Operation
Schematic
Bill of Materials
Layout
•
•
•
•
•
SC3303 EVB — R4
SC3303 EVB
2
Jumper Settings
Notes and General Operation
Check the jumper setting per the above
illustration.
Connect a 24V supply at the proper polar-
ity to the input voltage connection (J1).
Connect an output load as required (J2).
The SC3303 EVB (as shipped) operates in
the PSAVE mode with a minimum 25kHz
switching frequency at light load condi-
tions to improve eciency.
J2 — Output
Connector
JP1 — ENABLE / DISABLE
Enable — Connect pins 1-2
Disable — Connect pins 2-3
J1 — Input
Connector
TP3 — LX
TP4 — LDO
SC3303 EVB
3
Operation
Power Inputs/Outputs
J1 — Input — VIN
J2 — Output — VOUT
Test Points
TP2 — VOUT
TP3 — LX
TP4 — Internal LDO power output (+)
TP8 — VIN
TP10 — FB
Jumper Settings
The jumper settings are found in following table.
Jumper Description
JP1— EN
ENABLE Enable regulator
DISABLE Disable regulator
Operating Instructions
The SC3303 EVB is congured to supply 3.3V @ 3A from
the regulator and 5V @ 100mA from the LDO.
Basic Operation Instructions
The following steps are used for this option.
Verify that all power sources are either o or have
their outputs disabled before proceeding.
Disable the regulator by installing a shorting jumper
in DISABLE position.
Connect a load to the power output ba-
nana jacks at J2 (observe correct polarity).
Note: If using a passive resistive load, any value greater
than 1.1Ω can be used. When using an electronic load,
set for a constant current value equal to or less than
3A. Use hookup wire of at least 16 AWG or greater
with a length as short as possible to the load.
Connect a high current power supply to the banana
jacks at J1, using correct polarity. Note: Standard ba-
nana jack-to-cabling is used.
Turn on or enable the high current power input supply.
1.
2.
3.
4.
5.
Move jumper (JP1) to the ENABLE position. The fol-
lowing conditions should be observed:
VOUT should measure approximately 3.3V and
be sourcing current to the load
A typical waveforms for high and low current operation
are illustrated in the following gures.
Continuous Conduction Mode Operation (3A Load)
Power Save Operation (0A Load)
6.
•
SC3303 EVB
4
EVB Schematic
TP4
LDO
JP1 - EN
1
2
3
U1
SC3303
BST
1
VIN
2
LX
3
PGND
4
EN
7
TON
8
AGND
9
LDO
10
FB
6
PGOOD
5
R7
TP1
PGOOD
CBST
CTOP
NP
RTON
RTOP
RL
C8
NP
C13
10nF
CC
820pF
R1
VESR
Enable = Pins 1-2
Disable = Pins 2-3
COUT2
COUT3
J2
VOUT
COUT1
TP2
VOUT
+0.75V to 7.5V
at up to 3A max.
TP3
LX
CL
10nF
TP11
AGND
TP10 - FB
NP
VIN
CLDO2
1μF
1.00kΩ
100kΩ
0.1μF
10μH
L1
34kΩ
TP9
AGND
TP5
PGND
TP7
PGND
R8
TP6
PGND
Position as close to IC as possible
0Ω
RBOT
10kΩ
47μF47μF47μF
154kΩ
CLDO1
1μF
J1
VIN
TP8
VIN
CIN
VIN
10μF
@25V
33kΩ
SC3303 EVB
5
Bill of Materials
Reference
(1)
Value Footprint Hardware Notes
CIN 10µF/25V SM/C_1206 Murata GRM31CR61E106KA12L
CBST 0.1µF SM/C_0603 Murata GRM188R71H104KA93D
COUT1,C OUT2, COUT3 47µF SM/C_12010 Murata GRM32ER61C476ME15L
CL 10nF SM/C_0603 Murata GRM188R71H103MA01D
C13 10nF SM/C_0603 Murata GRM188R71H103MA01D
C8, CTOP NO_POP Not Used
CC 820pF SM/C_0603
CLDO1, CLDO2 1µF SM/C_0603 Murata GRM188R61A105MA61D
JP1 TH/CON_3_100 Molex 22-03-2031
J1-2
(2)
0.750 Johnson Components TH/BJACK_PAIR_0.750 108-0740-001
L1
(3)
10µH Coilcraft XAL6060-103MEB
MH1-4
(4)
TH/MH_128_PTH Commercial — not specied
R1 100KΩ SM/R_0603 Panasonic ERJ-3EKF1003V
RL 33KΩ SM/R_0603
RTOP 34.0KΩ SM/R_0603 Panasonic ERJ-3EKF3402V
RBOT 10KΩ SM/R_0603 Panasonic ERJ-3EKF1002V
RTON 154KΩ SM/R_0603
R7 1.00KΩ SM/R_0603 Panasonic ERJ-3EKF1001V
R8 0Ω SM/R_0603 Panasonic ERJ-3GEY0R00V
TP1-11 TH/TP_0.040 Mill-Max 3101-2-00-21-00-00-08-0
U1 SC3303 SM/MLPD_3X3-10 Semtech IC
Note:
(1) Critical components are in bold type.
(2) Two parts are used for each jack (four parts total) which are mounted to PCB with a nut on solder side of PCB.
(3) Do not use adhesive under the part
(4) Each mounting hole (MH1-4) uses a hex stando and #4 screw per mounting position.
V
IN
= 24V, V
OUT
= 3.3V, and I
OUT MAX
= 3A — Standard conguration only, components may vary per specic customer requirements.
SC3303 EVB
6
Layout Drawings — Top Components
SC3303 EVB
7
Layout Drawings — Top Layer
SC3303 EVB
8
Layout Drawings — Inner, Layer 1
SC3303 EVB
9
Layout Drawings — Inner, Layer 2
SC3303 EVB
10
Layout Drawings — Bottom Layer
SC3303 EVB
11
Layout Drawings — Bottom Components
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
SC3303 EVB
12
© Semtech 2011
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