MAX742CWP+T

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MAX742CWP+T is a highly efficient DC-to-DC switching controller designed for step-down and flyback switch-mode power supplies (SMPS). The device integrates a high side power MOSFET gate driver, constant frequency current mode controller, and a low-side output driver in a compact, 3 mm × 3 mm, 8 Ld Pb-free TSSOP package. This integrated device provides a space-saving, low-cost solution for low power applications. This device provides excellent load and line regulation, low audible noise, and low output ripple.

Application Field

MAX742CWP+T can be used to generate constant voltage from a power supply ranging from 4V to 40V. It has a variety of applications in industrial, automotive, and consumer segments, such as automotive displays, battery chargers, solar inverters, laptop power supplies, and many more. It is suitable for use in step-down converters, boost converters, flyback converters, isolated converters and other types.

Working Principle

The MAX742CWP+T is a current mode switching controller designed to work as a constant frequency, pulse-width-modulated (PWM) converter. It uses an internal oscillator to set the frequency of the PWM and utilizes an external voltage divider to set the reference voltage. It also features programmable soft-start, adjustable frequency and dead-time control, over-voltage protection, and an adjustable peak-current-limit threshold. The PWM outputs are used to drive external power MOSFETs which are connected to the positive and negative output terminals. The gate signals for the MOSFETs are generated internally and routed through the integrated gate driver. The output voltage is set by an external voltage divider. The two inputs of the voltage divider are connected to the high side MOSFET and the output, respectively. The output voltage is remotely sensed and regulated by the loop that includes a maximum duty cycle limit block.

The MAX742CWP+T also features a thermally enhanced package, allowing it to withstand higher temperatures, making it ideal for extreme reliability applications. In addition, it also features an integrated power-on reset over-voltage protection (OVP) circuit as well as a soft-start, auto-restart, and frequency foldback function. These features help protect both the device and the load circuit.

Conclusion

The MAX742CWP+T is a DC-to-DC switching controller designed for step-down and flyback SMPS. Its built-in features such as adjustable frequency, over-voltage protection and peak current limit provide high accuracy and power efficiency. With its wide range of applications from automotive to consumer segments, it is an ideal choice for designers who need a cost-effective and reliable DC-DC controller for their applications.

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