Semtech SC171A

Description

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.

Features

• 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

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

More information

• Datasheet
• IC product information