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SC419EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC419EVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 24 page  © 2010 Semtech Corporation 1 SC419 EcoSpeedTM DC-DC Converter with Integrated Boost Diode Features Power system Input voltage — 3V to 28V Integrated bootstrap switch 1% reference tolerance -40 to +85 °C EcoSpeedTM architecture with pseudo-fixed fre- quency adaptive on-time control Internal soft-start and soft-shutdown at output SmartDriveTM Logic input/output control Independent control EN for LDO and switcher Programmable V IN UVLO threshold Power good output Selectable power save mode Programmable ultrasonic power save mode Protections Over-voltage/under-voltage TC compensated R DS(ON) sensed current limit Thermal shutdown Smart power save Output capacitor types High ESR — SP, POSCAP, OSCON Ceramic capacitors Package — 3 x 3mm, 20-pin MLPQ Lead-free and halogen free RoHS and WEEE compliant Applications Office automation and computing Networking and telecommunication equipment Point-of-load power supplies and module replacement • • • • • • • • • • • • • • • • • Description The SC419 is a synchronous buck power supply controller. It features a bootstrap switch in a space-saving MLPQ- 3 x 3mm 20-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 SC419 supports using standard capacitor types such as electrolytic or special polymer in addition to ceramic, at switching frequencies up to 1MHz. The programmable frequency, synchronous operation, and programmable power-save provide high efficiency operation over a wide load range. Additional features include cycle-by-cycle current limit, soft-start, under and over-voltage protection, program- mable over-current protection, soft shutdown, selectable power-save modes, and programmable ultra-sonic power- save. The device also provides an enable input and a power good output, useful for sequencing multiple devices. The input voltage can range from 3V to 28V. The wide input voltage range and programmable frequency 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. July 27, 2010 POWER MANAGEMENT Typical Application Circuit ENABLE PGOOD PSV VDDA LX PGOOD ILIM EN TON RILIM + VOUT COUT 1µF L1 5V PGND AGND VOUT FB RTON SC419 CIN DH BST DL VDDP VIN 0.1µF PSV 5V VIN VIN VIN |
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