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.