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1 Features

1? Input Voltage Range: 8 V to 75 V

? Valley Current Limit At 1.25 A

? Switching Frequency Can Exceed 1 MHz

? Integrated N-Channel Buck Switch

? Integrated Start-Up Regulator

? No Loop Compensation Required

? Ultra-Fast Transient Response

? Operating Frequency Remains Constant With

Load and Line Variations

? Maximum Duty Cycle Limited During Start-Up

? Adjustable Output Voltage

? Precision 2.5-V Feedback Reference

? Thermal Shutdown

? Exposed Thermal Pad for Improved Heat

Dissipation

2 Applications

? High Efficiency Point-of-Load (POL) Regulator

? Non-Isolated Telecommunications Buck Regulator

? Secondary High Voltage Post Regulator

? Automotive Systems

3 Description

The LM5010 step-down switching regulator features

all the functions needed to implement a low-cost,

efficient, buck bias regulator capable of supplying in

excess of 1-A load current. This high-voltage

regulator contains an N-Channel Buck Switch, and is

available in thermally enhanced 10-pin WSON and

14-pin HTSSOP packages. The hysteretic regulation

scheme requires no loop compensation, resulting in

fast load transient response, and simplifies 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.