IR3651STRPBF

IR3651STRPBF Application Field and Working Principle

IR3651STRPBF is a high-performance, low-noise, monolithic synchronous buck voltage regulator, which is widely used in server, video card and gaming platform, etc. It can provide 3A output current at up to 1.2V output, and the external component count can be reduced. The IR3651STRPBF main feature includes a high-side and low-side MOSFET device which offer simultaneous switching slots, low quiescent current, low noise operation, external sense for sensing voltage, current mode control for enhanced line transients response and cycle-by-cycle current limit.

It belongs to PMIC – Voltage Regulators – DC DC Switching Controllers. Its working principle is based on the Remote Sense feature and is designed to regulate output voltage at the point of load regardless of the line losses. This Remote Sense feature is usually employed in systems having long lines of cables that connect the power supply to the load, which enables the output voltage at the load to remain stable and independent of the cable/transformer/bus drops that tend to reduce the actual voltage at the load. It has variable switching frequency (200KHz to 2MHz) and provides dynamic voltage scaling capability to several voltage regulation loops including output voltage, current mode control, over temperature protection and etc.

IR3651STRPBF offers cycle-by-cycle current limit, over temperature protection, input under voltage lockout and power good indicator, used to protect the load from an over-current condition before the device shuts down. The protection feature of the device helps to avoid the need for external FETs or other components to manage overload. In addition, the device offers precision control of the output voltage and provides exceptional line/load regulation.

The current mode topology of IR3651STRPBF is well suited for low voltage applications and it should be used in combination with an external low-side FET. The device also offers a low-side FET gate driver which makes it suitable for multi-phase designs. Mulit-phase power distributions are used in order to increase efficiency, minimize noise and provide temperature distribution.

The IR3651STRPBF can be easily used in the low-voltage applications and the internal feedback loop maintains a constant output voltage over the variation of load current. The wide input range for IR3651STRPBF supports the wide voltage range of its use. Furthermore, the internal synchronous rectifier FET reduces the EMI and increases the overall power efficiency.

In conclusion, IR3651STRPBF is a very useful voltage regulator which is well suited for low voltage applications. It provides high efficiency, low noise, remote sensing, current limiting and other features. This integrated voltage regulator is perfect for applications needing tight output regulation and improved power efficiency.