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1FEATURES

2? Integrated 55V, N-Channel Buck Switch

? Integrated Start-Up Regulator

? Input Voltage Range: 8V to 50V

? No Loop Compensation Required

? Ultra-Fast Transient Response

? Operating Frequency Remains Constant with

Load Current and Input Voltage

? Maximum Duty Cycle Limited During Start-Up

? Adjustable Output Voltage

? Valley Current Limit At 1.25A

? Precision Internal Reference

? Low Bias Current

? Highly Efficient Operation

? Thermal Shutdown

TYPICAL APPLICATIONS

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

? Non-Isolated Telecommunication Buck

Regulator

? Secondary High Voltage Post Regulator

DESCRIPTION

The LM34910C Step Down Switching Regulator

features all of the functions needed to implement a

low cost, efficient, buck bias regulator capable of

supplying 1.25A to the load. This buck regulator

contains a 55V N-Channel Buck Switch, and is

available in the thermally enhanced WSON-10 package. The hysteretic regulation scheme requires

no loop compensation, results 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

current limit detection is set at 1.25A. Additional

features include: VCC under-voltage lockout, thermal

shutdown, gate drive under-voltage lockout, and

maximum duty cycle limiter.

Package

? WSON-10 (4 mm x 4 mm)

? Exposed Thermal Pad For Improved Heat

Dissipation