1 Features

• 3.5-V to 42-V Input Voltage Range
• 200-mΩ High-Side MOSFET
• High Efficiency at Light Loads With a Pulse-Skipping Eco-mode™ Control Scheme
• 116-μA Operating Quiescent Current
• 1.3-μA Shutdown Current
• 100-kHz to 2.5-MHz Switching Frequency
• Synchronizes to External Clock
• Adjustable Slow Start/Sequencing
• UV and OV Power-Good Output
• Adjustable UVLO Voltage and Hysteresis
• 0.8-V ±3.5% Internal Voltage Reference
• MSOP10 With PowerPAD™ Package
• Supported by WEBENCH

2 Applications

• 12-V and 24-V Industrial and Commercial Low-Power Systems
• E-Meters

3 Description

The TPS5401 device is a 42-V, 0.5-A, 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 the supply current to 116 μA when outputting regulated voltage with no load. Using the enable pin, shutdown supply current is reduced to 1.3 μA when the enable pin is low.

Undervoltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage start-up ramp is controlled by the slow-start pin that can also be configured for sequencing/tracking. An open-drain power-good signal indicates the output is within 94% to 107% of its nominal voltage.

A wide switching-frequency range allows efficiency and external component size optimization. Frequency foldback and thermal shutdown protect the part during an overload condition.

The TPS5401 is available in a 10-pin thermally enhanced MSOP PowerPAD package.

1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

Efficiency vs. Load Current