1 Features

1• High Efficiency at Light Loads with Pulse Skipping

Eco-mode™

• 92-mΩ High-Side MOSFET

• 146 μA Operating Quiescent Current and

2 μA Shutdown Current

• 100 kHz to 2.5 MHz Fixed Switching Frequency

• Synchronizes to External Clock

• Low Dropout at Light Loads with Integrated BOOT

Recharge FET

• Adjustable UVLO Voltage and Hysteresis

• 0.8 V 1% Internal Voltage Reference

• 8-Terminal HSOP with PowerPAD™ Package

• –40°C to 150°C TJ Operating Range

• Create a Custom Design using the TPS54540 with

the WEBENCH® Power Designer

2 Applications

• Industrial Automation and Motor Control

• Vehicle Accessories: GPS, Entertainment

• USB Dedicated Charging Ports and Battery

Chargers

• 12 V and 24 V Industrial, Automotive and

Communications Power Systems

3 Description

The TPS54540 is a 42 V, 5 A, step down regulator

with an integrated high side MOSFET. The device

survives load dump pulses up to 45V 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 2 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.

Output current is limited cycle-by-cycle. Frequency

foldback and thermal shutdown protects internal and

external components during an overload condition.

The TPS54540 is available in an 8-terminal thermally

enhanced HSOP PowerPAD™ package.