LM5008MMX/NOPB Power Regulator IC 9.5-95V Wide Vin, 350mA Constant On-Time

1 Features

• Operating Input Voltage Range: 6 V to 95 V

• Integrated 100-V, 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

• 8-Pin VSSOP and WSON Packages

• Create a Custom Design Using the LM5008 With the WEBENCH® Power Designer

  
  

2 Applications

• Non-Isolated Telecommunication Buck Regulators

• Secondary High-Voltage Post Regulators

• 48-V Automotive Systems

3 Description

The LM5008 350-mA 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 100-V N-channel buck switch and operates over an input voltage range of 9 V to 95 V. The device is easy to implement and is provided in the 8-pin VSSOP and the 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. 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 undervoltage lockout, gate drive undervoltage lockout, and maximum duty cycle limiter.

Device Information