SC2621A Semtech Corporation, SC2621A Datasheet
SC2621A
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SC2621A Summary of contents
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... MOSFET switching loss. It allows the converter to operate with 4V to 25V power rail and as low as 0.5V output. The SC2621A is capable to drive a N-type MOSFET in a linear regulator with as low as 0.5V output. The SC2621A features soft-start, supply power under voltage lockout, and hiccup mode over current protec- tion ...
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... BST < < V < SC2621A ...
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... ° SC2621A ...
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... SC2621A ...
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... POWER MANAGEMENT Block Diagram www.DataSheet4U.com 2007 Semtech Corp. 8.2V 5 SC2621A www.semtech.com ...
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... Vpn at the load trip point. This voltage is sensing for dson the product of the inductor peak current at the load trip point and the R = ´ peak ds The soft start time of the SC2621A is fixed at around 6 SC2621A from the OCS pin to set 12V 12V ...
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... Internal LDO for Gate Drive Internal LDO for Gate Drive Internal LDO for Gate Drive An internal LDO is designed in the SC2621A to lower the 12V supply voltage for gate drive. An 1uF external ce- ramic capacitor connected in between DRV pin to the ground is needed to support the LDO. The LDO output is ...
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... Bootstrap Circuit Bootstrap Circuit Bootstrap Circuit Bootstrap Circuit The SC2621A uses an external bootstrap circuit to pro- vide a voltage at BST pin for the top MOSFET drive. This voltage, referring to the Phase Node, is held bootstrap capacitor. Typically recommended to use a 1uF ceramic capacitor with 16V rating and a commonly available diode IN4148 for the bootstrap circuit ...
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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 SC2621A 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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... Input (5V/DIV) 1.5V Output (1V/DIV) 3.3V Input (2V/DIV) 2.5V Output (2V/DIV 1.5V Output Response (100mV/DIV) Step Load Current (10A/DIV X=50ns/DIV 11 SC2621A Start up X=5ms/DIV Transient Response X=20us/DIV Short Circuit Protection Output Short 1.5V OUT (1V/DIV) Output Current (10A/DIV) X=5ms/DIV www.semtech.com ...
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... Gate Waveforms (Io=10A) DL (10V/DIV) DL (10V/DIV) DH (10V/DIV) DH (10V/DIV) PN (10V/DIV) PN (10V/DIV) 2007 Semtech Corp. put) put) put) put) 25V Input (10V/DIV) 5V Output (2V/DIV) 3.3V Output (1V/DIV Output Response (200mV/DIV) Step Load Current (10A/DIV) X=100ns/DIV X=100ns/DIV 13 SC2621A Start up X=5ms/DIV Transient Response X=20us/DIV www.semtech.com ...
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... GAGE PLANE 0.25 A 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 14 SC2621A DIMENSIONS INCHES MILLIMETERS NOM MAX MIN NOM MAX - - .069 1.35 1. .010 0.10 0. .065 1.25 1. .020 ...