1 Features
1• 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 highvoltage
converter has an integrated 80-V, 0.7-A Nchannel
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.