MAX742EWP+

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A MAX742EWP+ is an integrated switching regulator control system that offers tremendous flexibility in setting up its operating parameters. It can be used to either step-up or step-down the voltage by dynamically adjusting the switching duty cycle. When used in a step-up mode, the MAX742EWP+ keeps the output voltage at the desired level even if the input voltage is much lower than the output voltage. The reverse is also true for step-down applications. The MAX742EWP+ also features a unique soft-start mode which is not only beneficial for startup situations, but helps in reducing output voltage transients. It also offers protection for over-current, under-voltage, and over-voltage conditions.

The MAX742EWP+ is typically used in DC-to-DC switching power control applications such as computer peripheral controllers, portable consumer electronic battery supplies and other adapter-supplied equipment. It is also used in industrial battery or cell phone charger designs. The MAX742EWP+ can be used to construct low-cost, high-efficiency power supplies.

Working Principle

The MAX742EWP+ is designed around the basic principle of synchronous DC-DC buck regulator control. The MAX742EWP+ produces a regulated output voltage that is a fraction of the input voltage. The ratio between the input and output voltages is determined by the feedback connection ratio from the output to the error amplifier input which is set by an external resistor divider.

The main operational block of the MAX742EWP+ is the error amplifier, which compares the output reference voltage to the actual output voltage via the output voltage feedback. When the output voltage is different from the expected voltage level, the error amplifier output changes causing a change in the internal logic pulse width modulated (PWM) comparator, resulting in increased or decreased switching frequency of the chosen power stage. This in turn causes the output voltage to move away from the error correction band, until the error amplifier output reaches a balanced level once again.

The MAX742EWP+ also features a unique soft-start mode which helps reduce output voltage transients, as well as protection for over-current, under-voltage, and over-voltage conditions. It further offers protection against open loop and/or thermal runaway conditions. It can also be used as a quasi-constant frequency synchronous boost controller which helps reduce the output ripple by providing a constant frequency, depending on the ambient temperature.

Advantages

The main advantage of the MAX742EWP+ is its flexibility in setting up its operational parameters. Its ability to step-up or step-down voltages helps many applications to efficiently convert electricity. The MAX742EWP+ also offers protection for over-current, under-voltage, and over-voltage conditions which help reduce potential damage to equipment. The integrated soft-start mode prevents voltage transients while the oscillator design helps provide a stable output voltage. The MAX742EWP+ is also capable of handling large output current and offers very low external component count.

Applications

The MAX742EWP+ is used primarily in DC-to-DC power control applications such as computer peripheral controllers, portable consumer electronic battery supplies and other adapter-supplied equipment. It can also be used in industrial battery or cell phone charger designs. Typical applications of the MAX742EWP+ include notebook computer power supplies, LCD and LED flat panel displays, mobile wireless transceivers, and Point of Sale systems. It can also be used for automotive supply applications such as airbag systems, underhood lighting, and engine management systems.

Conclusion

The MAX742EWP+ offers tremendous flexibility in setting up its operating parameters, which makes it ideal for a wide variety of applications in both industrial and consumer markets. It can be used to provide efficient, cost effective power conversion and protection from over-current, under-voltage, and over-voltage conditions. Its integrated soft-start mode also helps reduce voltage transients while the oscillator design allows it to deliver stable output voltage. The MAX742EWP+ is thus an excellent choice for DC-to-DC power control applications in notebook computers, LCD and LED displays, portable electronics, automobiles and more.

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