ISL61853LCRZ-T

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Power management integrated circuits (PMIC) are an important component of any device, responsible for providing and regulating power to devices. Hot Swap Controllers like ISL61853LCRZ-T are specially designed PMICs, operating as an efficient electronic switch to hold power in standby and to switch main device power to enable when the device needs it. In this article, we will take a look into the application field and working principle of the ISL61853LCRZ-T.

Application field

The Intersil ISL61853LCRZ-T is a low-side Hot Swap Controllers designed for powering boards/line cards in switch and router applications. The device is a 12V to 28V Input 2A, 40V/3A, low-side Hot Swap Controller. It utilizes external power MOSFETs and is optimized to maximize hot insertion capability while minimizing insertion losses. It has a wide operating temperature range(-40℃ to +85℃) and it is suitable for various of environments and operating conditions.

The robust protection on the ISL61853LCRZ-T is designed to protect the device, the system and the load from common failure conditions, such as input under voltage (UV) , over voltage (OV)/surge, reverse-battery, overcurrent and overtemperature. It also provides built-in soft-start and current limit to avoid inrush current to the system and load.

The applications of the ISL61853LCRZ-T include powering boards/line cards on routers and switches, high powered peripheral boards, onboard FPGA/ASIC boards, industrial equipment and any other similar applications which requires power supply and efficient hot swap protection.

Working principle

The principle of operation of the ISL61853LCRZ-T is as follows: When the UVP (Under Voltage Protection) is detected, the MOSFET controlling the power is disabled. If the input voltage is above the OVP (Over Voltage Protection) threshold, the MOSFET is disabled and the MOSFET drains current away from the load. When the input voltage is in the normal range (between the UVP and OVP thresholds), the Hot Swap Controller enables the MOSFET to connect the load to the system. If the current exceeds the over current protection (OCP) threshold, the MOSFET is disabled and the load is disconnected from the system.

The ISL61853LCRZ-T is designed to ensure that the power-up sequency is robust and reliable. It provides an adjustable soft-start for load limiting and an adjustable current limit to ensure correct power-up sequencing and to keep inrush current to the system and load within safe limits. It also provides a latch-off circuit that prevents the MOSFET from being turned on until the input voltage has stabilized after a power-down event. After the input voltage is stabilized, the MOSFET can be turned on again.

In the event of an overtemperature condition, the ISL61853LCRZ-T provides thermal fold back, reducing the duty cycle of the MOSFET. This helps to reduce the power dissipation in the MOSFET, thus preventing the MOSFET from becoming damaged due to excessive power dissipation.

Conclusion

The ISL61853LCRZ-T PMIC is an advanced Hot Swap Controllers ideal for powering boards/line cards in switch and router applications. With its robust protection features, wide operating temperature range and adjustable soft-start, current limit and thermal fold back, it ensures reliable and safe power supply to its load. Its application field consists of powering boards/line cards in switches and routers, high powered peripheral boards, industrial equipment and other similar power applications.

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