The TPS54540DDA is a 5A Step-down DC-DC Converter with an integrated high side MOSFET and Eco-mode™. 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 146µA. Shutdown supply current is reduced to 2µA when the enable pin is pulled low. Under-voltage lockout is internally set at 4.3V but can increase using an external resistor-divider at the enable pin. The output voltage start up ramp is internally controlled to provide a controlled start up and eliminate overshoot. 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.
High efficiency at light loads with a pulse-skipping Eco-mode™
92mR High-side MOSFET
146µA Operating quiescent current and 2µA shutdown current
100kHz to 2.5MHz Adjustable switching frequency
Synchronizes to external clock
Low dropout at light loads with integrated BOOT recharge FET
Adjustable UVLO voltage and hysteresis
0.8V 1% Internal voltage reference
Green product and no Sb/Br
This device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
