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Description

The LM5008 Step-Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. This high voltage regulator contains an 100 V N-Channel Buck Switch. The device is easy to implement and is provided in the VSSOP-8 and the thermally enhanced WSON-8 packages.

The regulator is based on a hysteretic control scheme using an ON time inversely proportional to Vin. This feature allows the operating frequency to remain relatively constant. The hysteretic control requires no loop compensation. An intelligent current limit is implemented with forced
OFF time, which is inversely proportional to Vout. This scheme ensures short circuit protection while providing minimum foldback. Other protection features include: Thermal Shutdown, Vcc under-voltage lockout, Gate drive under-voltage lockout, and Max Duty Cycle limiter

Featuers

• Integrated 100V, N-Channel buck switch
• Internal Vcc regulator
• No loop compensation required
• Ultra-Fast transient response
• On time varies inversely with line voltage
• Operating frequency remains constant with varying line voltage and load current
• Adjustable output voltage
• Highly efficient operation
• Precision internal reference
• Low bias current
• Intelligent current limit protection
• Thermal shutdown