TPS5403

TPS5403 www.ti.com SLVSBK5 – SEPTEMBER 2012 4.5-V TO 28-V INPUT VOLTAGE, 3.3-V FIXED OUTPUT, 1.7-A OUTPUT CURRENT, NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET Check for Samples: TPS5403 FEATURES 1 Fixed 3.3-V Output 4.5-V to 28-V Wide Input Voltage Range Up to 1.7-A Maximum Continuous Output Loading Current Pulse Skipping Mode to Achieve High Light Load Efficiency Over 80% Efficiency at 10-mA Loading Adjustable 50-kHz to 1.1-MHz Switching Frequency Set by an External Resistor (Leave pin ROSC floating. Set frequency to 120 kHz and ground connection to 70 kHz) Peak Current-Mode Control Cycle-by-Cycle Over Current Protection Frequency Spread Spectrum and Switching Node Anti-Ringing to Ease EMI Issue External Soft Start Available in SOIC8 Package APPLICATIONS 5-V, 9-V, 12-V and 24-V Distributed Power Systems Consumer Applications Such as Home Appliances, Set-Top Boxes, CPE Equipment, LCD Displays, Peripherals, and Battery Chargers Industrial and Car Entertainment Power Supplies DESCRIPTION The TPS5403 is a monolithic non-synchronous buck regulator with wide operating input voltage range from 4.5 V to 28 V. Current mode control with internal slope compensation is implemented to reduce component count. TPS5403 also features a light load pulse skipping mode, which allows for a power loss reduction from the input power supply to the system at light loading. The switching frequency of the converters can be set from 50 kHz to 1.1 MHz wit...