MAX1795EUA+T

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The MAX1795EUA+T is a synchronous step-down DC-DC switching regulator specifically designed for replacing inefficient linear regulators. It’s optimized for low noise, low ripple, and low power consumption.

Applications of the MAX1795EUA+T

The MAX1795EUA+T is suitable for a wide range of applications, such as automotive, industrial, medical, telecommunications, and consumer products. It includes advanced features such as external compensated soft-start and enables high efficiency at light and heavy loads, even at very low supply currents.

In automotive applications, it’s used in engine control units, infotainment systems, instrument panel clusters, and occupant detection systems. In industrial and medical applications, it’s used in data acquisition systems, process control, HVAC systems, patient monitors, and Point of Care testing.

In consumer applications, it’s used in tablets, handhelds, digital cameras, digital media players, gaming consoles, and battery-powered systems. It’s also used in LED lighting and power supply modules.

Working Principle of the MAX1795EUA+T

The MAX1795EUA+T features a high-efficiency synchronous buck regulator with an adjustable 4.6V to 11.4V input voltage range and an adjustable 0.9V to 5V output voltage range. It includes a low noise 0.615mΩ power stage and a basic compensation network that allows for higher switching frequencies and higher conversion efficiency.

It includes a 150mA LDO for powering up the logic, and a low noise PWM switching stage for high efficiency at light loads. It features adjustable soft-start for slowly ramping up the output voltage when the regulator is turned on, as well as adjustable thermal shutdown and overcurrent protection. It also includes integrated overvoltage protection.

The step-down regulator operates in continuous conduction (CCM) mode, where the inductor is always dissipating current while the switch is on. The inductor current is then reduced gradually to zero when the switch is off, allowing for high efficiency at light loads even at very low supply currents. The switching frequency is determined by the oscillator frequency and the fixed frequency pulse width modulation (PWM) control.

Conclusion

The MAX1795EUA+T is a high-efficiency synchronous step-down DC-DC switching regulator specifically designed for replacing inefficient linear regulators. Its wide range of applications includes automotive, industrial, medical, telecommunications, and consumer products. It features advanced features such as external compensated soft-start and enables high efficiency at light and heavy loads, even at very low supply currents. Its working principle is based on the continuous conduction (CCM) mode, with a low-noise 0.615mΩ power stage, and a 150mA LDO for powering up the logic.

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