The TPS54140 device is a 42-V, 1.5-A, step-down regulator with an integrated high-side
MOSFET. Current mode control provides simple external compensation and flexible component
selection. A low-ripple pulse-skip mode reduces the no load, regulated output-supply current to 116
µA. Using the enable pin, the shutdown supply current is reduced to 1.3 µA.
Undervoltage lockout is internally set at 2.5 V, but can be increased using the enable
pin. The output-voltage startup ramp is controlled by the slow-start pin that can also be
configured for sequencing and tracking. An open-drain power-good signal indicates the output is
within 94% to 107% of the nominal voltage.
A wide switching frequency range allows efficiency and external component size to be
optimized. Frequency foldback and thermal shutdown protects the device during an overload
The TPS54140 device is available in a 10-pin thermally enhanced MSOP PowerPAD
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