MXL7704-XQB-T

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MXL7704-XQB-T Application Field and Working Principle

The MXL7704-XQB-T is one of the finest examples of the special purpose voltage regulators available in the market. It is designed specifically for 5V DC-DC converters, providing high stability and output accuracy throughout the device’s operating range. The MXL7704-XQB-T also features a wide input range, low quiescent current, and high efficiency up to 96%, making it an ideal choice for today’s portable and battery-powered applications.

The MXL7704-XQB-T is comprised of two main parts: a control IC and a p-channel MOSFET. The controller operates in a constant-duty-cycle, voltage-mode control with minimum current consumption. The power MOSFET, on the other hand, is an advanced, cost-effective p-channel device with high switching frequencies. Together, these create a regulation circuit that maintains a very high accuracy for a wide range of input voltages, even at light loads.

The MXL7704-XQB-T is rated for input voltages of 4.4V-36V and provides an output voltage of 5V. It is tuned for current loads between 0.5 and 3A. Furthermore, the PSpice model (with MOSFET recommended) provides an input voltage tolerance of 15% (from 5V to 6V) as well as a current load tolerance of up to 5%. Finally, it has a built-in overvoltage protection circuit that limits the output voltage to a maximum of 5.5V.

Working Principle of the MXL7704-XQB-T

The MXL7704-XQB-T utilizes a voltage-mode control (VMC) architecture, which provides an efficient and simple solution to control the DC-DC converter’s output voltage. The VMC architecture allows very accurate control of the output voltage and ripple, even under light load conditions. This makes it perfect for applications such as powering delicate circuits, where a clean power supply is required.

The MXL7704-XQB-T uses a voltage divider to measure the output voltage and a voltage-mode PWM controller to compare it with a precision reference voltage. Any errors between the reference voltage and the output voltage are used to modulate the on-time of the power switch. This modulation of the switch is the basis of the voltage-mode control system, which provides excellent overall performance, making the design quite simple.

The reference voltage is normally tightly regulated, making sure that the output voltage stays constant and very stable. For light load conditions, the MXL7704-XQB-T can switch at a very slow switching frequency, allowing the output ripple to be minimized.

The MXL7704-XQB-T also features advanced protection features such as overvoltage protection and a built-in thermal shutdown. These features ensure that the device will not be damaged in extreme conditions. In summary, the MXL7704-XQB-T is a very reliable and versatile voltage regulator, perfect for an array of portable and battery-powered applications.

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