Application Field And Working Principle

Introduction

MAX764CPA+ is a monolithic DC-DC converter IC designed for use as a miniature switching regulator or relay driver. It is designed to convert low voltage DC power supplies into higher voltage DC output, offering excellent line and load regulation. Its wide input voltage range of 3V to 32V makes it ideal for small power IoT and other current-limited applications. The MAX764CPA+ features a high-voltage output capability that allows it to switch currents up to 300mA. Its high efficiency makes it a great choice for powering applications operating with low input voltages.

Application Field

The MAX764CPA+ is well suited for a variety of DC-DC converter applications such as ineffectual power supply systems, SMPS, motor control, and automotive applications. The MAX764CPA+ is optimized for high efficiency operation, offering nearly maximum power output for a wide range of input voltages. It is also ideal for use with step-up DC/DC converter topologies, where it is easy to design and use with minimum external components. The MAX764CPA+ is ideal for battery-powered designs since its low operating current gives long life and its high switching frequency reduces the size of external components.

Working Principle

The MAX764CPA+ works on a basic step-up DC-DC converter topology. Its output voltage is determined by voltage feedback. The internal oscillator turns on and off the high-side switch, while the low-side switch is self-softening, allowing continuous output current. Its duty cycle is determined by the aproppiate proportion of the output voltage and the feedback voltage which is fed back to the non-inverting input of the error amplifier inside the IC.

The MAX764CPA+ has two additional features that are important when used as a relay or motor driver. First, the IC provides over voltage protection. This prevents against damage caused by transient overvoltage. Second, the IC also provides arching protection, which prevents relay and motor contacts from sticking when switching the output high if the current on the load is higher than the minimum maximum current specified by the datasheet.

Conclusion

The MAX764CPA+ is an extremely versatile and efficient DC-DC converter IC that can be used for a variety of applications. It works on a basic step-up DC-DC converter topology with the output voltage determined by voltage feedback. The IC features over voltage and arching protection, making it a great choice for powering battery-powered designs.