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SC427MLTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC427MLTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 30 page  © 2009 Semtech Corporation 1 SC417/SC427 10A Integrated FET Regulator with Programmable LDO Features Input voltage — 3V to 28V Internal power MOSFETs — 10A Integrated bootstrap switch Smart power-save protection Configurable 150mA LDO with bypass capability TC compensated R DS(ON) sensed current limit Pseudo-fixed frequency adaptive on-time control Designed for use with ceramic capacitors Programmable V IN UVLO threshold Independent enable for switcher and LDO Selectable ultra-sonic power-save (SC417) Selectable power-save (SC427) Internal soft-start and soft-shutdown at output Internal reference — 1% tolerance Over-voltage/under-voltage fault protection Power good output SmartDriveTM Lead-free 5x5mm, 32 Pin MLPQ package Fully WEEE and RoHS compliant Applications Notebook, desktop, tablet, and server computers Networking and telecommunication equipment Printers, DSL, and STB applications Embedded applications Power supply modules Point of load power supplies Description The SC417/SC427 is a stand-alone synchronous buck power supply. It features integrated power MOSFETs, a bootstrap switch, and a programmable LDO in a space- saving MLPQ-5x5mm 32-pin package. The device is highly efficient and uses minimal PCB area. It uses pseudo-fixed frequency adaptive on-time operation to provide fast transient response. The SC417/SC427 supports using standard capacitor types such as electrolytic or special polymer, in addition to ceramic, at switching frequencies up to 1MHz. The pro- grammable frequency, synchronous operation, and select- able power-save provide high efficiency operation over a wide load range. The LDO output is programmable from 0.75V to 5.25V using external resistors. The bias voltage for the device can be supplied by the on-chip LDO when V IN > 4.5V, or by an external 5V supply. When a separate source is used as the bias supply, the LDO can be programmed to provide a different voltage. Additional features include cycle-by-cycle current limit, soft-start, under and over-voltage protection, program- mable over-current protection, soft shutdown, and select- able power-save. The device also provides separate enable inputs for the PWM controller and LDO as well as a power good output for the PWM controller. The input voltage can range from 3V to 28V. The wide input voltage range, programmable frequency, and pro- grammable LDO make the device extremely flexible and easy to use in a broad range of applications. Support is provided for single cell or multi-cell battery systems in addition to traditional DC power supply applications. March 12, 2009 POWER MANAGEMENT |
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