XRP7674IDTR-F Integrated Circuits (ICs)

DC DC Switching Regulators

A DC to DC switching regulator is an electrical device used to efficiently reduce or increase the output voltage from a given input voltage. Switching regulators are widely used in a variety of applications, such as automotive, telecommunications, industrial control, and consumer electronics. The XRP7674IDTR-F is a high-efficiency, synchronous step-down DC to DC converter that can provide up to 1.25A of continuous output current at an input voltage range of 4.5V to 24V. This device has a wide range of features, such as adjustable switching frequency, low-noise operation, adjustable internal soft-start, and over-temperature protection.

XRP7674IDTR-F Application Field and Working Principle

The XRP7674IDTR-F is most suitable for applications that require efficiency and low-noise operation. It is designed for load steps of 1.25A maximum and input voltages from 4.5V to 24V. The device features use of a N-MOSFET synchronous step-down regulator topology and operates at a fixed frequency up to 1.5 MHz. This allows for the design of small and efficient magnetic components, resulting in low output noise and ripple. This proprietary topology allows for lower component count than the competing solutions, resulting in greater improvement in efficiency.

The XRP7674IDTR-F integrates high-side and low-side N-MOSFETs in a single integrated circuit together with current-sense, voltage dividers, and control circuitry. Specifically, the device includes a high-side power switch on top of the low-side switch, a total of 8 external components (2 if the 0.47uH low-profile inductor is used), an optional external Peltier Diode and current limit protection. This simplified layout provides better space utilization and savings in overall component cost.

The device requires the designer to make two external connections. The first connection applies a reference voltage, usually derived from the input voltage, to the FB pin. The second connection provides for reverse-bias protection for the device. This connection also provides an adjustable external soft-start timing. In addition to these two external connections, the device has an internal compensation circuit that adjusts the phase shift of the current sense in the event that the input voltage is greater than the output voltage. This adjustment allows for proper output voltage regulation at any input voltage greater than the output voltage.

The XRP7674IDTR-F utilizes a fixed frequency operation, providing low-noise operation and high efficiency. In addition to the oscillator, the device includes an adjustable Internal Soft-Start feature to reduce inrush current and output capacitor stress, as well as an over-temperature protection circuit. The adjustable switching frequency ensures that the device can be optimized for a variety of applications. Additionally, the device uses an active p-channel pull-down circuit to protect against uncontrolled start-up hang-up and to control the length of the soft-start time.

The XRP7674IDTR-F’s frequency can be adjusted between 500 kHz and 1.5 MHz, which enables a wide range of applications, from low noise audio amplifiers to high-power automotive and industrial applications. The Fixed on-time mode of operation provides a simple method of setting the output voltage ripple, which is determined by the on-time and inductor selection.

Conclusion

The XRP7674IDTR-F is a high-efficiency, synchronous step-down DC to DC converter that can supply up to 1.25A of output current at an input voltage range of 4.5V to 24V. This device integrates a high-side and low-side N-MOSFET in a single integrated circuit and features adjustable switching frequency, low-noise operation, adjustable internal soft-start, over-temperature protection, and current limit protection. This makes it ideal for a range of applications, such as automotive, telecommunications, industrial control, and consumer electronics.