Buck controller for 24V industrial rails
The Texas Instruments TPS40052PWPG4 is a single-phase synchronous buck PWM controller designed for step-down conversion from a 10V to 40V input rail. It drives an external transistor pair — high-side and low-side — and includes synchronous rectification to keep efficiency up in the 94% duty-cycle range. Typical applications include industrial power supplies, telecom line cards, and distributed bus regulators where the input comes from a 24V or 48V backplane.
Package and rework — 16-HTSSOP with exposed pad
The supplier device package is 16-HTSSOP.
Control features and loop design
The controller includes current limiting, an enable pin, frequency control, and a soft-start ramp. The soft-start reduces inrush during power-up, which matters when the load has bulk capacitance. The frequency control pin lets you synchronise the oscillator to an external clock — useful for noise-sensitive designs that need to place the switching harmonics outside a critical band. The output is a single transistor driver, positive configuration, so the high-side gate drive is bootstrapped from the switch node.
It is not specified for automotive under-hood or extended-temperature military use — the 85°C ceiling is the limit for the controller itself, though the external MOSFETs may need a higher temperature rating depending on the thermal design.