LM5008MM/NOPB

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 V_IN. 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 V_OUT. This scheme ensures short-circuit protection while providing minimum foldback. Other protection features include: thermal shutdown, V_CC undervoltage lockout, gate drive undervoltage lockout, and maximum duty cycle limiter.

Applications

• Non-Isolated Telecommunication Buck Regulators
• Secondary High-Voltage Post Regulators
• 48-V Automotive Systems

Key features

• Operating Input Voltage Range: 6 V to 95 V
• Integrated 100-V, N-Channel Buck Switch
• Internal V_CC 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