SC221

SC221 x POWER MANAGEMENT 20MHz, 650mA, X-EMI™-Enabled Synchronous Step-Down Regulator Features Description „„ Patented X-EMITM Inductor Technology „„ Enables Trace Inductors in PC Board Material „„ Excellent EMI Performance „„ Efficiency up to 90% „„ 17.5µA Quiescent Current under Very Light Loads „„ 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 MLPD-UT 8 Lead Packages „„ Lead-free, Halogen-free, and RoHS/WEEE Compliant Applications „„ HDTV, Set Top Boxes, Gaming Consoles „„ POL Applications „„ White Goods The SC221 is a 20MHz X-EMI™(1)-enabled step-down regulator optimized for power 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 technology meets or exceeds the EMI performance of chip inductors and eliminates the need for discrete inductors. The SC221 uses a unique constant frequency, self-oscillating control loop architecture to provide excellent transient performance. Under light loads...