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IC manufacturers Semtech

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Semtech SC171A

1A EcoSpeedTM Synchronous Step-Down Regulator with Optional Ultrasonic Power Save


TopologyOther Topology
Switching frequency200-1000 kHz


The SC171 is an integrated, synchronous 1A EcoSpeedTMstep-down regulator, which incorporates Semtech’sadvanced, patented adaptive on-time architecture toachieve best-in-class performance in dynamic point-ofloadapplications. The input voltage range is 3V to 5.5Vwith a programmable output voltage from 0.75V up to95% x VIN. The device features low-RDS(ON) internal switchesand optional PSAVE mode for high efficiency acrossthe output load range.Adaptive on-time control provides programmable pseudo-fixed frequency operation and excellent transientperformance. The switching frequency can be set from200kHz to 1MHz - allowing the designer to reduce externalLC filtering and minimize light load (standby) losses.Disabling PSAVE operation reduces output voltage rippleat light load for ceramic output capacitors.Additional features include cycle-by-cycle current limit,soft start, input UVLO and output OV protection, andover temperature protection. The open-drain PGOODpin provides output status. Standby current is less than10μA when disabled.The device is available in a low profile, thermally enhancedMLPD-3x3mm 10-pin package.


  • VIN: 3V to 5.5V
  • VOUT: 0.75V to 95% x VINI
  • OUT: Up to 1A
  • Low RDS(ON) Switches
  • Up to 95% Peak Efficiency
  • High Output Accuracy
  • Small Ceramic Capacitors
  • Power Good Pin (Open-Drain)
  • Patented Adaptive On-Time Control:
  • Excellent Transient Response
  • Programmable Pseudo-fixed Frequency
  • Fault Protection Features:
  • Cycle-by-Cycle Current Limit
  • Short Circuit Protection
  • Over and Under Output Voltage Protection
  • Over-Temperature

Internal Soft start

  • Ultrasonic Power Save
  • Smart Power Save
  • Ultra-Small Lead-Free 3x3mm, 10-Pin MLPD Package
  • Fully WEEE and RoHS Compliant

Typical applications

  • Consumer Devices (DTV, Set-top Box, ... )
  • Networking Equipment, Embedded Systems
  • Medical Equipment
  • Office Automation
  • Instrumentation, Portable Systems
  • 5V POL Converters