SC3303 EVB Evaluation Board User’s Guide POWER MANAGEMENT Description Feature Content SC3303 EVB provides one 3A integrated MOSFET regulator 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 procedures, circuit design procedures, a typical application circuit, and other application information. • • • • • Jumper Settings Operation Schematic Bill of Materials Layout 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 capabilities. The user’s can eliminate these test points and jumpers to simplify the circuit for a specific application. SC3303 EVB — R4 Revision 1.0 © 2011 Semtech Corporation SC3303 EVB Jumper Settings TP3 — LX J2 — Output Connector J1 — Input Connector JP1 — ENABLE / DISABLE Enable — Connect pins 1-2 Disable — Connect pins 2-3 TP4 — LDO Notes and General Operation Check the jumper setting per the above illustration. Connect a 12V supply at the proper polarity 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 conditions to improve efficiency. SC3303 EVB Operation Power Inputs/Outputs 6. Move jumper (JP1) to the ENABLE position. The following conditions should be observed: VOUT should measure approximately 3.3V and be sourcing current to the load J1 — Input — VIN J2 — Output — VOUT • Test Points TP2 — VOUT TP8 — VIN TP10 — FB TP3 — LX TP4 — Internal LDO power output (+) A typical waveforms for high and low current operation are illustrated in the following figures. 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 configured to supply 3.3V @ 3A from the regulator and 5V @ 100mA from the LDO. Continuous Conduction Mode Operation (3A Load) Basic Operation Instructions (LDO disabled) The following steps are used for this option. 1. Verify that all power sources are either off or have their outputs disabled before proceeding. 2. Disable the regulator by installing a shorting jumper in DISABLE position. 3. Connect a load to the power output banana 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. 4. Connect a high current power supply to the banana jacks at J1, using correct polarity. Note: Standard banana jack-to-cabling is used. 5. Turn on or enable the high current power input supply. Power Save Operation (0A Load) SC3303 EVB EVB Schematic TP1 PGOOD R1 J1 VIN CBST TP8 VIN VIN 1 0.1μF 2 3 CIN 10μF @25V 4 5 TP3 LX TP4 LDO 100kΩ U1 BST SC3303 LDO AGND VIN TON LX PGND EN PGOOD FB 10 9 VESR C8 7 6 RT ON 154kΩ C13 Enable = Pins 1-2 Disable = Pins 2-3 10nF TP2 VOUT J2 COUT1 COUT2 COUT3 47μF CC TP10 - FB NP 820pF CL 10nF JP1 - EN 1 2 3 8 L1 RL 33kΩ R7 1.00kΩ CLDO2 1μF CLDO1 1μF 10μH NP VIN RBOT 10kΩ CTOP NP 47μF 47μF VOUT +0.75V to 7.5V at up to 3A max. TP11 AGND RTOP 34kΩ TP5 PGND TP6 PGND TP7 PGND R8 TP9 AGND 0Ω Position as close to IC as possible SC3303 EVB Bill of Materials VIN = 24V, VOUT = 3.3V, and IOUT MAX = 3A — Standard configuration only, components may vary per specific customer requirements. Reference(1) Value Footprint 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 CC 820pF SM/C_0603 CLDO1, CLDO2 1µF SM/C_0603 JP1 Not Used TH/CON_3_100 10µH MH1-4 Molex 22-03-2031 Coilcraft XAL6060-103MEB TH/MH_128_PTH (4) R1 Murata GRM188R61A105MA61D Johnson Components TH/BJACK_PAIR_0.750 108-0740-001 J1-2(2) L1(3) Hardware Notes 100KΩ SM/R_0603 Commercial — not specified 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 TH/TP_0.040 Mill-Max 3101-2-00-21-00-00-08-0 TP1-11 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 standoff and #4 screw per mounting position. SC3303 EVB Layout Drawings — Top Components SC3303 EVB Layout Drawings — Top Layer SC3303 EVB Layout Drawings — Inner, Layer 1 SC3303 EVB Layout Drawings — Inner, Layer 2 SC3303 EVB Layout Drawings — Bottom Layer 10 SC3303 EVB Layout Drawings — Bottom Components 11 SC3303 EVB © Semtech 2011 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFESUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. 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