The TPS54540 is a 42 V, 5 A, step down regulator with an integrated high side MOSFET. The
device survives load dump pulses up to 45V per ISO 7637. Current mode control provides simple
external compensation and flexible component selection. A low ripple pulse skip mode reduces the no
load supply current to 146 µA. Shutdown supply current is reduced to 2 µA when the enable pin is
Undervoltage lockout is internally set at 4.3 V but can be increased using the enable
pin. The output voltage start up ramp is internally controlled to provide a controlled start up and
A wide switching frequency range allows either efficiency or external component size to
be optimized. Output current is limited cycle-by-cycle. Frequency foldback and thermal shutdown
protects internal and external components during an overload condition.
The TPS54540 is available in an 8-terminal thermally enhanced HSOP PowerPAD™ package.
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