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.