MAX722CSE

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The MAX722CSE is a special purpose voltage regulator from Texas Instruments. It is a two-terminal, negative voltage regulated linear voltage regulator with a voltage range of -2.4V to -4.2V. The device is designed for use in a variety of demanding applications such as portable medical electronics, designed to reduce stress on power sources and provide the necessary voltage levels for signal headers in wired networks. This application note will discuss the application field and working principle of the MAX722CSE voltage regulator.

The MAX722CSE can be used in a number of applications such as industrial and consumer electronics, medical devices, RF/microwave/infrared systems, battery powered equipment, uninterruptible power supplies, and general purpose power regulation for diverse power architectures. The device is designed to work within a wide input voltage range, with adjustable voltage output and an active low soft-start for improved regulation. In addition, the device features high efficiency, low quiescent current, high temperature operation, and low dropout voltage.

The device is managed by a control circuit which includes two analog current inputs. The voltage output is maintained by these two inputs which continually monitor the output voltage to keep it in the desired range. The first input is used to adjust the regulator into a voltage mode, while the second input produces a reference voltage which accurately holds the voltage regulation within the specified output voltage values. The output voltage can be set with an external resistor divider. It requires no external components, making it easier to use in many applications.

The device is manufactured using a CMOS process technology. This process allows the MAX722CSE to remain efficient when operated at higher currents. The current limit capability is adjustable using an external resistor which is connected via an amplifier to the second input for linear regulation, allowing for wide range of output current regulation. The built-in over-current protection feature provides protection against overload current, which helps prolong the life of the device.

The device includes two shutdown inputs, a power-on reset, and a thermal shutdown function. These features provide safety against over-currents and thermal overloads. The two shutdown inputs can be used to disconnect the device from the power source, essentially turning it off. The power-on reset provides an initial reset signal at power-on to ensure the device starts in a known state. The thermal shutdown feature ensures the device is shutdown when the temperature becomes too high.

In addition, the device provides over-voltage protection so that an over-voltage condition is instantly recognized and the regulator’s output is terminated. This feature provides additional safety against voltage surges or accidental voltage spike, which could damage the device.

The MAX722CSE can be used in a variety of different applications. It is designed to reduce stress on power sources and provide the necessary voltage levels for signal headers in wired networks. The device is also useful for powering portable medical electronics, as it has wide input voltage range, adjustable voltage output and a soft-start feature for improved regulation. In addition, its low quiescent current and efficient power handling capabilities make it an ideal choice for battery-powered devices such as portable medical equipment or other devices that require less power but must still maintain low voltage level.

In summary, the MAX722CSE voltage regulator from Texas Instruments is a two-terminal, negative voltage regulated linear voltage regulator. It is designed for a wide range of applications, is simple to use, and incorporates features such as over-voltage protection and thermal shutdown that provide additional safety. Its efficient power handling capabilities, combined with its adjustable voltage output and low quiescent current, make it an ideal choice for a variety of applications, including portable medical electronics and battery-powered devices.

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