The TPS54140A 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, 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/tracking. An open drain power good signal indicates the output is within
94% to 107% of its nominal voltage.
A wide switching frequency range allows efficiency and external component size to be
optimized. Frequency fold back and thermal shutdown protects the part during an overload
condition.
