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SC220 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC220 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 14 page  POWER MANAGEMENT 1 SC220 20MHz, 650mA, X-EMI™-Enabled Synchronous Step-Down Regulator Features Patented X-EMITM Inductor Technology Enables Trace Inductors in PC Board Material Excellent EMI Performance Efficiency up to 90% 19μA Quiescent Current under Very Light-load Wide Input Voltage Range — 2.7V to 5.5V Adjustable Output Voltage Down to 1.0V Output DC Current — up to 650mA High Light-load Efficiency via Automatic PSAVE Mode Ultra-fast Transient Response — <1μs Temperature Range — -40 to +85°C Shutdown Current — 0.1μA (typical) Requires Tiny 220nH Inductor Requires Only 1μF of Output Capacitance External Switching Frequency Synchronization Protection Features Including Over-Current Protection Output Short-Circuit Protection Thermal Shutdown Protection Offered in SOIC 8 Lead Package Lead-free, Halogen-free, and RoHS/WEEE Compliant Applications HDTV, Set Top Boxes, Gaming Consoles POL Applications White Goods Automotive (EMI sensitive console applications) Description The SC220 is a 20MHz X-EMI™(1)-enabled step-down regu- lator optimized for powering low voltage rails from 2.7 to 5.5V input voltage. X-EMI™ inductor technology enables inductors to be drawn directly on the PC board. This tech- nology meets or exceeds the EMI performance of chip inductors and eliminates the need for discrete inductors. The SC220 uses a unique constant frequency, self-oscil- lating control loop architecture to provide excellent transient performance. Under light load condition, the device operates in Power Save Mode (PSAVE) and main- tains a typical quiescent current of 19μA. At moderate to heavy loads, this part operates in PWM mode with a con- stant switching frequency of 20MHz. This high switching frequency offers the advantages of using small and low cost external components like a 1μF external capacitor and a small 220nH inductor (including X-EMITM PCB trace inductors). The device provides adjustable output voltages down to 1.0V and an output current up to 650mA. An EN pin can be used to synchronize to an external source and includes de-glitching to reduce noise sensitivity. The SC220 is available in SOIC 8 lead package. Note 1: Purchase of SC220 includes royalty-free rights to use X-EMITM inductor technology with no additional cost. Typical Application Circuit January 25, 2012 SC220 AG N D SW VO U T VIN L, 220nH C OUT 1 μF EN Enable FB AVIN PVIN C IN 1 μF R 1 R 2 PG N D V OUT=1.8V up to 650m A 2.7~5.5V |
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