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™

• 138-μA Operating Quiescent Current

• 1.3-μA Shutdown Current

• 100-kHz to 2.5-MHz Switching Frequency

• Synchronizes to External Clock

• Adjustable Slow Start and Sequencing

• UV and OV Power Good Output

• Adjustable UVLO Voltage and Hysteresis

• 0.8-V Internal Voltage Reference

• 10-Pin HVSSOP and 10-Pin 3-mm x 3-mm VSON

Packages with PowerPAD™

• Supported by WEBENCH® Software Tool

2 Applications

• 12-V and 24-V Industrial and Commercial Low-

Power Systems

• GSM, GPRS Modules in Fleet Management,

eMeters, and Security Systems

3 Description

The TPS54240 device is a 42-V, 2.5-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 no load,

regulated output supply current to 138 μA. 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 it can be increased using the enable pin. The output

voltage startup ramp is controlled by the slow-start

pin that can also be configured for sequencing and

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 optimization of external component size.

Frequency foldback and thermal shutdown protects

the part during an overload condition.

The TPS54240 is available in 10-pin, thermally-

enhanced HVSSOP and 10-pin 3-mm x 3-mm

PowerPAD package.