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 with an external resistor. Frequency spread spectrum operation is introduced for EMI reduction.
●LX anti-ringing is added to address high frequency EMI issues.
●A cycle-by-cycle current limit with frequency fold back protects the IC at over loading condition.
● 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
