1 Features

1• LM5010A-Q1 Qualified for Automotive

Applications

• AEC-Q100 Qualified With the Following Results:

– Device Temperature Grade 1: –40°C to 125°C

Ambient Operating Temperature Range

– Device Temperature Grade 0: –40°C to 150°C

Ambient Operating Temperature Range

– Device HBM ESD Classification Level 2

– Device CDM ESD Classification Level C5

• Wide 6-V to 75-V Input Voltage Range

• Valley Current Limit at 1.25 A

• Programmable Switching Frequency Up To 1 MHz

• Integrated 80-V N-Channel Buck Switch

• Integrated High Voltage Bias Regulator

• No Loop Compensation Required

• Ultra-Fast Transient Response

• Nearly Constant Operating Frequency With Line

and Load Variations

• Adjustable Output Voltage

• 2.5-V, ±2% Feedback Reference

• Programmable Soft-Start

• Thermal Shutdown

• Exposed Thermal Pad for Improved Heat

Dissipation

2 Applications

• Non-Isolated Telecommunications Regulators

• Secondary Side Post Regulators

• Automotive Electronics

3 Description

The LM5010Ax step-down switching regulator is an

enhanced version of the LM5010 with the input

operating range extended to 6-V minimum. The

LM5010Ax features all the functions needed to

implement a low-cost, efficient, buck regulator

capable of supplying in excess of 1-A load current.

This high-voltage regulator integrates an N-Channel

Buck Switch, and is available in thermally enhanced

10-pin WSON and 14-pin HTSSOP packages. The

constant ON-time regulation scheme requires no loop

compensation resulting in fast load transient

response and simplified circuit implementation. The

operating frequency remains constant with line and

load variations due to the inverse relationship

between the input voltage and the ON-time. The

valley current limit detection is set at 1.25 A.

Additional features include: VCC undervoltage

lockout, thermal shutdown, gate drive undervoltage

lockout, and maximum duty cycle limiter.