TPS54308DDCR Description

The TPS54308 is a 4.5 V to 28 V input voltage range, 3 A synchronous buck converter. The device includes two integrated switching FETs, internal loop compensation, and 5-ms internal soft start to reduce component count. By integrating the MOSFETs and employing the SOT-23 package, the TPS54308 achieves high power density and offers a small footprint on the PCB.
The TPS54308 operates in force continuous conduction mode (FCCM) during light load conditions. The switching frequency is maintained at an almost constant level over entire load range. Cycle-by-cycle current limit in both high-side MOSFETs protects the converter in an overload condition and is enhanced by a low-side MOSFET freewheeling current limit, which prevents current runaway. Hiccup mode protection is triggered if the overcurrent condition has persisted for longer than the present time.
TPS54308DDCR Features

4.5-V to 28-V wide input voltage range
Integrated 85-mΩ and 40-mΩ MOSFETs for 3-A, continuous output current
Low 2-μA shutdown, 300-μA quiescent current
Internal 5-mS soft start
Fixed 350-kHz switching frequency
Peak current mode control
Internal loop compensation
Overcurrent protection for both MOSFETs with hiccup mode protection
Overvoltage protection
Thermal shutdown
SOT-23 (6) package
TPS54308DDCR Applications

12-V, 24-V distributed power-bus supply
White goods
Audio
STB, DTV
Printer