1 Features

1• 4.5 V to 42 V (45 V Abs Max) Input Range

• 3.5 A Continuous Current, 4.5 A Minimum Peak

Inductor Current Limit

• Current Mode Control DC-DC Converter

• 92-mΩ High-Side MOSFET

• High Efficiency at Light Loads with Pulse Skipping

Eco-mode™

• Low Dropout at Light Loads with Integrated BOOT

Recharge FET

• 146 μA Operating Quiescent Current

• 1 μA Shutdown Current

• 100 kHz to 2.5 MHz Fixed Switching Frequency

• Synchronizes to External Clock

• Adjustable UVLO Voltage and Hysteresis

• Internal Soft-Start

• Accurate Cycle-by-Cycle Current Limit

• Thermal, Overvoltage, and Frequency Foldback

Protection

• 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 with WEBENCH Tools

2 Applications

12 V, 24 V Industrial, Automotive and

Communications Power Systems

3 Description

The TPS54340 is a 42 V, 3.5 A, step down regulator

with an integrated high side MOSFET. The device

survives load dump pulses up to 45 V 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 1 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.

Frequency foldback and thermal shutdown protects

internal and external components during an overload

condition.

The TPS54340 is available in an 8-terminal thermally

enhanced HSOP PowerPAD™ package.