• 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
• Internal Soft-Start
• Accurate Cycle-by-Cycle Current Limit
• Thermal, Overvoltage, and Frequency Foldback Protection
• 0.8 V 1% Internal Voltage Reference
• 8-Terminal HSOIC with PowerPAD™ Package
• –40°C to 150°C TJ Operating Range
• Supported by WEBENCH™ Software Tool

12 V, 24 V Industrial, Automotive and Communications Power Systems

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.