The TPS54340 is a 42 V, 3.5 A, step down regulator with an integrated high side MOSFET. The device survives load dump pulses up to 45 V 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 1 µA when the enable pin is pulled low.
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 eliminate overshoot.
A wide switching frequency range allows either efficiency or external component size to be optimized. Frequency foldback and thermal shutdown protects internal and external components during an overload condition.
The TPS54340 is available in an 8-terminal thermally enhanced HSOIC PowerPAD package.
4.5 V to 42 V (45 V Abs Max) Input Range
3.5 A Continuous Current, 4.5 A Minimum Peak Inductor Current Limit
Current Mode Control DC-DC Converter
92-mΩ High-Side MOSFET
High Efficiency at Light Loads with Pulse Skipping Eco-mode
Low Dropout at Light Loads with Integrated BOOT Recharge FET
146 µA Operating Quiescent Current
1 µA Shutdown Current
100 kHz to 2.5 MHz Fixed Switching Frequency
Synchronizes to External Clock
Adjustable UVLO Voltage and Hysteresis
Accurate Cycle-by-Cycle Current Limit
Thermal, Overvoltage, and Frequency Foldback Protection