sc2621 Semtech Corporation, sc2621 Datasheet
sc2621
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sc2621 Summary of contents
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... MOSFET switching loss. It allows the converter to operate at 500kHz switching frequency with 4V to 16V power rail and as low as 0.5V output. The SC2621 is capable to drive a N-type MOSFET in a linear regulator with as low as 0.5V output. The SC2621 features soft-start, supply power under volt- age lockout, and hiccup mode over current protection ...
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... BST < < V < SC2621 ...
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... SC2621 ...
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... SC2621 ...
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... POWER MANAGEMENT Block Diagram 2003 Semtech Corp. 8.2V 5 SC2621 www.semtech.com ...
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... R pn peak ds The soft start time of the SC2621 is fixed at around 5ms. Therefore, the maximum soft start current is determined by the output inductance and output capacitance. The values of output inductor and output bulk capacitors have to be properly selected so that the soft start peak cur- rent does not exceed the load trip point of the short cir- cuit protection ...
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... MOSFETs are minimized. COMPONENT SELECTION COMPONENT SELECTION COMPONENT SELECTION COMPONENT SELECTION COMPONENT SELECTION General design guideline of switching power supplies can be applied to the component selection for the SC2621. Inductor and MOSFET Induct Induct or and MOSFET or and MOSFETs and MOSFET ...
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... DC accuracy and a faster transient response for the output voltage, while maintaining the loop stability. The block diagram in Fig. 3 represents the control loop of a buck converter designed with the SC2621. The con- trol loop consists of a compensator, a PWM modulator, and a LC filter. ...
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... MOSFETs must be as small as pos- sible. Keep the input bulk capacitors close to the drain of the top MOSFETs. bot (2). Place the SC2621 over a quiet ground plane to avoid pulsing current noise. Keep the ground return of the gate drive short. (3). Connect bypass capacitors as close as possible to the decoupling pins (DRV and Vcc) to the ground pin GND ...
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... SEE DETAIL SIDE VIEW -A- AND - DETERMINED AT DATUM PLANE -H- DIM INCHES Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 10 SC2621 DIMENSIONS INCHES MILLIMETERS NOM MAX MIN NOM MAX - - .069 1.35 1. .010 0.10 0. .065 1.25 1 ...