1 Features

1• 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.