TPS54540BDDAR

TPS54540B is a 42V, 5A 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 no-load supply current to 146μA. When the EN pin is pulled low, shutdown supply current drops to 2μA. The UVLO is internally set at 4.3V but can be raised using the EN pin. The output voltage startup ramp is internally controlled to ensure a managed startup and eliminate overshoot. The wide switching frequency range enables optimization for either efficiency or external component size. Output current is cycle-by-cycle current limited. Frequency foldback and thermal shutdown protect internal and external components under overload conditions. The TPS54540B is available in an 8-pin thermally enhanced HSOIC PowerPAD package.

Applications

• Industrial automation and motor control
• USB dedicated charging ports and battery chargers
• 12V, 24V industrial and communications power systems

Key features

• High-efficiency Eco-mode™ with pulse skipping under light load conditions
• 92mΩ high-side MOSFET
• 146μA operating quiescent current and 2μA shutdown current
• Fixed switching frequency 100kHz to 2.5MHz with external clock synchronization
• Low dropout with integrated BOOT recharge FET under light load conditions
• Adjustable UVLO and hysteresis
• 0.8V ±1% internal voltage reference
• 8-pin HSOIC PowerPAD package
• -40°C to 150°C TJ operating range
• Create custom designs with TPS54540B using WEBENCH Power Designer