LM5007MMX Power Regulator IC Switching Voltage Regulators

1 Features

• Versatile Synchronous Buck DC/DC Converter

• – Operating Input Voltage Range of 9 V to 75 V

• – Integrated 80-V, 0.7-A N-Channel Buck Switch

• – Internal High-Voltage VCC Regulator

• – Adjustable Output Voltage

• – High Efficiency Operation

• Adaptive Constant On-Time Control Architecture

  • – Ultra-Fast Transient Response

  • – No Control Loop Compensation Required

• Nearly Constant Switching Frequency

– PWM On-Time Varies Inversely with Input Voltage

• Precision 2.5-V Reference

• Low Input Quiescent Current

• Inherent Protection Features for Robust Design

  • – Intelligent Current Limit Protection

  • – VCC and Gate Drive UVLO Protection

  • – Thermal Shutdown Protection With Hysteresis

  • – External Shutdown Control

• 8-Pin VSSOP and WSON Packages

• Create a Custom Regulator Design Using

  WEBENCH® Power Designer

2 Applications

• Non-Isolated DC/DC Buck Regulator

• Secondary High-Voltage Post Regulator

• 48-V Automotive Systems

3 Description

The LM5007 0.5-A step-down switching converter features all of the functions needed to implement a low-cost and efficient buck regulator. This high- voltage converter has an integrated 80-V, 0.7-A N- channel buck switch and operates over an input voltage range of 9 V to 75 V. The device is easy to implement and is provided in 8-pin VSSOP and thermally enhanced 8-pin WSON packages.

The converter uses a hysteretic control scheme with a PWM on-time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant with load and input voltage variations. The hysteretic control requires no loop compensation and provides fast transient response. An intelligent current limit is implemented with forced off-time that is inversely proportional to VOUT. This current limiting scheme ensures short-circuit protection while providing reduced load current foldback. Other protection features include thermal shutdown with automatic recovery, VCC and gate drive undervoltage lockout, and maximum duty cycle limiter.

Device Information