MAX17223ELT+T

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DC-DC switching regulators are an important type of voltage regulator in today\'s electronics. The MAX17223ELT+T application field and working principle provide an integrated solution to the demand for high-efficiency, reliable power conversion.

MAX17223ELT+T Overview

The MAX17223ELT+T is a step-down switching regulator, with integrated power-supply control, voltage-regulation and fault-protection features. The voltage regulator IC provides a high-efficiency, low-noise, and low-cost solution for application fields such as automotive, wireless, and computing.

The MAX17223ELT+T is designed to operate from a wide input voltage range of 4 V to 60 V. It can output 1.2 A continuous and 3.2 A peak at up to 99.8% efficiency over the complete load range. The adjustable output voltage range is 1.2 V to 13.2 V, with a 3-MHz switching frequency and minimal external components.

The regulator can be programmed to limit inrush current, reducing the risk of inrush current damage. The temperature-compensated current limit setting is also adjustable with an external resistor. The device integrates the gate-drivers and bootstrap diode, and includes protection features such as input UVLO, output overvoltage (OV), and output overcurrent (OC). A typical application diagram of the MAX17223ELT+T is shown in Figure 1.

MAX17223ELT+T Working Principle

DC-DC switching regulators use a specific switching principle to control a power-conversion circuit. The voltage-regulation operation is achieved by pulse-width modulation (PWM) of the output voltage. This PWM method lets the regulator to reduce the power dissipation during the idle time, using a high switching frequency.

The MAX17223ELT+T uses a buck topology as the power-conversion circuit. The input voltage is applied on the switching devices. A switching frequency clock is used to regulate the duty cycle of the switch, controlling the output voltage. During the first half cycle of the switching signal, the N-channel MOSFET is turned on, allowing the input voltage to charge the inductor. During the second half cycle, the output diode is turned on, allowing the inductor current to flow to the output. In this way, a regulated voltage is available on the output.

The output voltage regulation is achieved by controlling the duty cycle of the switch, using the external circuitry. If a constant output voltage is desired, then the duty cycle must be controlled by an error amplifier circuit. The error amplifier compares the output voltage with a reference voltage and generates an error signal. This error signal, in turn, is used to regulate the duty cycle of the switch, and the output voltage is thereby maintained. The current-limiting circuit can be used to set the maximum output current, protecting the device if the load current is suddenly increased.

Conclusion

The MAX17223ELT+T is a step-down switching regulator with integrated power-conversion and protection features, providing a high-efficiency, low-noise and low-cost solution for various application fields. The regulator can be easily programmed for a wide input voltage range, current-limiting, and output voltage range with minimal external components. The voltage regulation is achieved by using pulse-width modulation, with the error amplifier compensating for any deviations from the desired output voltage.

The MAX17223ELT+T is an ideal solution for applications including automotive, wireless and computing, providing designers with a reliable and efficient power-conversion solution.

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