MAX622ESA+T

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Introduction - MAX622ESA+T

The MAX622ESA+T is an adjustable voltage regulator that is designed to provide output voltage levels between 1.5V and 5.5V for applications that require supply voltages on-the-fly. This regulator can be used for a variety of applications such as switching power supplies, portable device chargers, and mobile phone chargers.

Features of the MAX622ESA+T include an adjustable output voltage range of 1.5V to 5.5V, wide input voltage range between 3.5V and 6.5V, low quiescent current (3.5mA typical at 5V output with no load), fast transient response, and integrated short-circuit protection.

Application Field

The MAX622ESA+T is suitable for a broad range of applications that require adjustable output voltages, such as:

• Switch mode power supplies
• Portable device chargers such as Bluetooth headsets, PDA and mobile phone chargers
• Display backlighting power supplies
• MP3/MP4 players

The MAX622ESA+T is also suitable for powering embedded controllers and other low power systems.

Working Principle - Block Diagram

The MAX622ESA+T works by using a PWM comparator and an oscillator to control the average output voltage of an external power transistor. The voltage reference is set with an external resistor divider, and the output voltage is adjusted by selecting the right resistor combination.

The following diagram shows the basic functional block diagram of the MAX622ESA+T voltage regulator:

The external power transistor is driven through an internal control circuit. The error amplifier senses the output voltage and controls the oscillator frequency. The PWM comparator compares the oscillator output with the reference and the power transistor is turned on for the period determined by the PWM comparator. This ensures that the output voltage is maintained at the desired level.

Conclusion

The MAX622ESA+T is a highly flexible and adjustable regulator, suitable for a broad range of applications that require adjustable output voltages. It features an adjustable output voltage range of 1.5V to 5.5V, wide input voltage range between 3.5V and 6.5V, low quiescent current, fast transient response and integrated short-circuit protection.

The MAX622ESA+T is a convenient and cost-effective solution for applications that require adjustable output voltages on the fly.

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