TPS54308DDCT

TPS54308 is a 3A synchronous buck converter with an input voltage range of 4.5V to 28V. The device integrates two switching FETs with internal loop compensation and a 5ms internal soft-start, reducing component count. By integrating MOSFETs in a SOT-23 package, the TPS54308 achieves high power density with a minimal PCB footprint. Under light-load conditions, the TPS54308 operates in Forced Continuous Conduction Mode (FCCM), maintaining a nearly constant switching frequency across the full load range. Cycle-by-cycle current limiting in the two high-side MOSFETs protects the converter during overload conditions, while freewheeling current limiting in the low-side MOSFET prevents current runaway for enhanced protection. When an overcurrent condition persists beyond a preset duration, hiccup-mode protection is triggered.

Applications

• 12V, 24V distributed bus power supplies
• Industrial applications
• White goods
• Consumer applications
• Audio
• Set-top box (STB)
• Digital TV (DTV)
• Printers

Key features

• Wide input voltage range: 4.5V to 28V
• Integrated 85mΩ and 40mΩ MOSFETs, 3A continuous output current
• Shutdown current as low as 2μA, quiescent current 300μA
• Internal 5ms soft-start
• 350kHz fixed switching frequency
• Peak current mode control
• Internal loop compensation
• Overcurrent protection for both MOSFETs via discontinuous mode
• Overvoltage protection
• Thermal shutdown
• SOT-23 (6) package
• Create custom designs with TPS54308 using WEBENCH PowerDesigner