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. The switching frequency is programmable from 100kHz to 1MHz, which lets you trade inductor size against switching losses. 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.
Temperature grade and environment
Rated for -40°C to 85°C ambient, this part suits indoor and outdoor industrial enclosures, base-station power modules, and factory-floor DC-DC stages. 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.