SC173 TM 3A EcoSpeed Synchronous Step-Down Regulator with Optional Ultrasonic Power Save POWER MANAGEMENT Features Description V : 3V to 5.5V TM IN The SC173 is an integrated, synchronous 3A EcoSpeed V : 0.75V to 95% x V OUT IN step-down regulator, which incorporates Semtechs I : Up to 3A OUT advanced, patented adaptive on-time architecture to Low R Switches DS(ON) achieve best-in-class performance in dynamic point-of- Up to 95% Peak Efficiency load applications. The input voltage range is 3V to 5.5V High Output Accuracy with a programmable output voltage from 0.75V up to Small Ceramic Capacitors 95% x V . The device features low-R internal switch- IN DS(ON) Power Good Pin (Open-Drain) es and optional PSAVE mode for high efficiency across Patented Adaptive On-Time Control: the output load range. Excellent Transient Response Programmable Pseudo-fixed Frequency Adaptive on-time control provides programmable pseu- Fault Protection Features: do-fixed frequency operation and excellent transient Cycle-by-Cycle Current Limit performance. The switching frequency can be set from Short Circuit Protection 200kHz to 1MHz - allowing the designer to reduce exter- Over and Under Output Voltage Protection nal LC filtering and minimize light load (standby) losses. Over-Temperature Disabling PSAVE operation reduces output voltage ripple Internal Soft start at light load for ceramic output capacitors. Ultrasonic Power Save Smart Power Save Additional features include cycle-by-cycle current limit, Ultra-Small Lead-Free 3x3mm, 10-Pin MLPD Package soft start, input UVLO and output OV protection, and Fully WEEE and RoHS Compliant over temperature protection. The open-drain PGOOD pin provides output status. Standby current is less than Applications 10A when disabled. Networking Equipment, Embedded Systems The device is available in a low profile, thermally en - Medical Equipment, Office Automation hanced MLPD-3x3mm 10-pin package. Instrumentation, Portable Systems Consumer Devices (DTV, Set-top Box, ... ) 5V POL Converters Typical Application Circuit 3 to 5.5V VIN BST VOUT = 0.75V to 95% VIN LX SC173 VDD FB PGOOD Power Good Enable / EN/PSV TON Power Save PGND AGND October 27 , 2010 2010 Semtech Corporation 1SC173 Pin Configuration Ordering Information (2) Device Top Mark Package (1) SC173MLTRT 173 MLPD-10 3x3 SC173EVB Evaluation Board VDD BST Notes: VIN AGND 1) Available in tape and reel packaging only. A reel contains 3000 devices. LX TON 2) Available in lead-free packaging only. WEEE compliant and Halogen free. This component and all homogenous sub-components are RoHS PGND EN/PSV compliant. PGOOD FB 10 Pin MLPD = 40C/W. JA Marking Information TOP MARKING 173 yyww xxxx yyww = Date Code (Example: 0952) xxxx = Semtech Lot Number (Example: 3901) 2010 Semtech Corporation 2