ISL89400AR3Z-T

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The ​ISL89400AR3Z-T is an integrated device that includes a buck DC/DC controller, 2 low-side MOSFET drivers with embedded diagnostics and deadtime control, and a high-side MOSFET driver. It is designed to drive both the buck switch and its synchronous rectifier (SR) when used in a synchronous buck regulator. With programmable deadtime and adjustable slew rates, it also simplifies design, improves efficiency and reduces avalanche energy.

Application field

The ​ISL89400AR3Z-T is an integrated device designed for use in synchronous buck regulators. It provides the logic functions required to control high-side and low-side MOSFETs and ensures the synchronous rectifier (SR) is in the proper turn-on and turn-off state. It is well suited for applications that require high efficiency, such as server and telecom supplies.

The device also includes a buck DC/DC controller with programmable output voltage and current limit, as well as on-board diagnostics. This includes undervoltage (UV) lockout, short-circuit protection, and over-temperature protection.

Working principle

The ​ISL89400AR3Z-T is designed for use in synchronous buck regulators. It consists of two low-side MOSFET drivers and one high-side MOSFET driver. The high-side driver is used to control the buck switch, while the low-side drivers control the SR.

The device has programmable deadtime and adjustable slew rates. This reduces avalanching on the MOSFETs and helps to improve efficiency. It also helps to ensure that the SR is in the proper turn-on and turn-off state. The device contains an advanced synchronous PWM controller and has configurable voltage/current limit for over-load protection.

The integrated UVLO ensures that the buck controller and driver will not turn on until the input voltage reaches the correct level. The device also features on-board diagnostics such as short-circuit protection and over-temperature protection.

The ​ISL89400AR3Z-T has a wide operating temperature range of -40°C to +125°C, making it suitable for a variety of applications. The device is also RoHS compliant, which makes it environmentally friendly.

Conclusion

The ​ISL89400AR3Z-T is an integrated device designed for use in synchronous buck regulators. It includes a buck DC/DC controller, two low-side MOSFET drivers, and one high-side MOSFET driver. The device has programmable deadtime and adjustable slew rates, and contains an advanced synchronous PWM controller. It also has configurable voltage/current limit and integrated UVLO, as well as short-circuit protection and over-temperature protection. With its wide operating temperature range and RoHS compliance, the ​ISL89400AR3Z-T is well suited for applications that require high efficiency.

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