1 Features

• 4 V to 40 V Input Range
• 3.5 A Continuous Output Current
• Ultra-low 40 µA Operating Quiescent Current
• 90 mΩ High-Side MOSFET
• Minimum Switch-On Time: 75 ns
• Current Mode Control
• Adjustable Switching Frequency from 200 kHz to 2.5 MHz
• Frequency Synchronization to External Clock
• Internal Compensation for Ease of Use
• High Duty Cycle Operation Supported
• Precision Enable Input
• 1 µA Shutdown Current
• External Soft-start
• Thermal, Overvoltage and Short Protection
• 8-Pin HSOIC with PowerPAD™ Package

2 Applications

• Automotive Battery Regulation
• Industrial Power Supplies
• Telecom and Datacom Systems
• Battery Powered System

3 Description

The LMR14030 is a 40 V, 3.5 A step down regulator with an integrated high-side MOSFET. With a wide input range from 4 V to 40 V, it’s suitable for various applications from industrial to automotive for power conditioning from unregulated sources. The regulator’s quiescent current is 40 µA in Sleep-mode, which is suitable for battery powered systems. An ultra-low 1 μA current in shutdown mode can further prolong battery life. A wide adjustable switching frequency range allows either efficiency or external component size to be optimized. Internal loop compensation means that the user is free from the tedious task of loop compensation design. This also minimizes the external components of the device. A precision enable input allows simplification of regulator control and system power sequencing. The device also has built-in protection features such as cycle-by-cycle current limit, thermal sensing and shutdown due to excessive power dissipation, and output overvoltage protection.

1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Simplified Schematic

Efficiency vs Output Current