LM5008AMM/NOPB LM5008MM/NOPB LM5008MMX/NOPB Power Regulator IC Switching Voltage Regulators

1 Features

• Operating Input Voltage Range: 6 V to 95 V

• Integrated 100-V N-Channel Buck Switch

• Internal Start-Up Regulator

• No Loop Compensation Required

• Ultra-Fast Transient Response

• On-Time Varies Inversely With Input Voltage

• Operating Frequency Remains Constant With Varying Line Voltage and Load Current

• Adjustable Output Voltage From 2.5 V

• Highly Efficient Operation

• Precision Internal Reference

• Low Bias Current

• Intelligent Current Limit

• Thermal Shutdown

• 8-Pin VSSOP and 8-Pin WSON Packages

• Create a Custom Design Using the LM5008A With the WEBENCH® Power Designer

2 Applications

• Non-Isolated Telecommunication Buck Regulators

• Secondary High-Voltage Post Regulators

• 48-V Automotive Systems

3 Description

The LM5008A DC/DC converter is a functional variant of the LM5008 COT Buck Switching Regulator. The functional differences of the LM5008A are: the minimum input operating voltage is 6 V, the on-time equation is slightly different, and the requirement for a minimum load current is removed.

The LM5008A 350-mA step-down switching regulator features all of the functions required 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 6 V to 95 V. The device is easy to implement and is provided in 8-pin VSSOP and the thermally enhanced 8-pin WSON packages. The converter uses PWM control scheme with an on-time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The control scheme 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 control while providing minimum foldback. Other features include: thermal shutdown, VCC undervoltage lockout, gate drive undervoltage lockout, maximum duty cycle limiter, and a pre- charge switch.

Device Information