MAX5065EAI

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The MAX5065EAI is a high performance, low power DC-DC switching controller designed to meet the stringent requirements of modern automotive, industrial and telecom applications. The device is natural fit for many power supply designs and provides high performance and efficient operation in a wide variety of applications such as automotive, portable, industrial, and telecom power supplies. This article examines the application fields and working principles of the MAX5065EAI.

Applications

The MAX5065EAI is well-suited for step-up, step-down, and boost-buck converter applications.

• Step-up converters
  • Battery-powered systems and applications
  • Points of load for industrial applications
  • Telecom rectifier systems
• Step-down converters
  • Automotive electronics and system rail-tracking power supplies
  • Positive-to-negative converter
  • Data converter power supplies
• Boost-Buck converters
  • Load dump protection
  • High-voltage input for PCB mounted modules
  • C-RADAR and microwave applications

The MAX5065EAI switching controller is designed to accurately regulate output voltage or current as specified with a minimum number of external components. Its on-chip logic allows pulse-by-pulse current limit, output overvoltage, undervoltage, and short-circuit protection. The device also incorporates an internal or external soft-start feature.

Typical Application Circuit

Figure 1 below shows the block diagram of a typical application circuit for a MAX5065EAI.

Figure 1: MAX5065EAI Application Circuit

In this application the MAX5065EAI is used as a boost regulator to regulate the output by comparing the reference voltage to the focused voltage. This focused voltage is made from a voltage divider across the output. The MAX5065EAI is designed to drive an external power MOSFET and sense the current flowing through the power MOSFET. It utilizes a direct input to control the MOSFET gate and low-side current sensing.

Working Principle

The MAX5065EAI is an integrated DC-DC switching controller with an on-chip voltage regulator specifically designed to meet stringent requirements of modern automotive, industrial and telecom application. The device incorporates pulse-by-pulse current limit, output overvoltage, undervoltage, and short-circuit protection features. The MAX5065EAI works by controlling the gate drive of an external power MOSFET and sensing the current flowing through the power MOSFET.

The device requires only a 5V bias voltage for operation, and includes a burst-mode oscillator for low noise and low base plate current consumption. During normal operation, the MAX5065EAI maintains an internal oscillator which creates an input clock signal to trigger the PWM comparator. The comparator compares the input reference voltage to the focused voltage, generally created from the output voltage divided down by a voltage divider. When the reference voltage is higher than the focused voltage, the comparator output is high and the device will activate the external power MOSFET with the required gate drive voltage.

The device also incorporates an internal or external soft-start feature. This feature helps to minimize inrush current during startup and provides smooth current output. The MAX5065EAI also monitors the current flow in the MOSFET and reduces the gate voltage drive when the current reaches the device’s current limit. This protects the device from over-current fault conditions.

Conclusion

The MAX5065EAI DC-DC switching controller is ideal for many power supply designs. It provides a high performance and efficient operation in a wide variety of applications such as automotive, portable, industrial, and telecom power supplies. The device features pulse-by-pulse current limit, output overvoltage, undervoltage and short-circuit protection. The device requires only a 5V bias voltage for operation, and includes a burst-mode oscillator for low noise and low base plate current consumption. These features make the MAX5065EAI well-suited for many power supply designs.

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