ISL61861AIBZ-T7A Integrated Circuits (ICs)

Programmable Features:	--
Base Part Number:	ISL6186
Feature Pins:	EN1, /FLT
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Current - Supply:	57µA
Operating Temperature:	-40°C ~ 85°C
Current - Output (Max):	1.5A
Voltage - Supply:	2.5 V ~ 5.5 V
Series:	--
Features:	Fault Timeout, Latched Fault, Thermal Limit, Turn On Voltage, UVLO
Applications:	USB
Internal Switch(s):	Yes
Number of Channels:	2
Type:	Hot Swap Controller
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PMIC - Hot Swap Controllers have been increasingly popular in recent years, due to their ability to safely and efficiently manage power within electronic components. The ISL61861AIBZ-T7A is a wide input range, true-hot swap current sense PWM controller by Intersil. It is ideal for applications requiring efficient, low power, high-current supplies. This article will discuss the ISL61861AIBZ-T7A application field and working principles. The ISL61861AIBZ-T7A is specifically designed for powering sensitive electronic components in order to reduce the failure rate due to inrush current. This is done by limiting the inrush current to a manageable level in order to protect the system from draw abnormalities that may cause component damage. The controller can be used for applications such as hot swapping of high current supplies, powering FPGAs, powering system memory and powering up digital networks. In terms of functional specification, the ISL61861AIBZ-T7A provides a variable duty cycle based on the input voltage, allowing for accurate control of the power output. It features a wide input voltage range of 3V to 34V and a low quiescent current of only 2uA in shutdown mode. This enables the controller to maintain high efficiencies, reducing power consumption in the system. The ISL61861AIBZ-T7A also provides a sense resistor based current limit with an adjustable peak current rating of up to 6A. This allows the controller to accurately monitor current levels and safely protect sensitive components from damage. The device also offers an adjustable off-time of up to 200us and a current limit transition time of 20us, allowing for more precise control of the power output. In terms of working principles, the ISL61861AIBZ-T7A maintains power efficiency by utilizing a linearly derived PWM to provide a variable duty cycle. This allows for accurate control of the power output, ensuring the system operates at maximum efficiency. During the on-time, the device monitors the voltage drop across the sense resistor and controls the period based on the detected current flow. The current limit of the controller is set to the peak current rating and automatically adjusts for changes in load or input voltage. In addition, the device also features an overvoltage/undervoltage protection monitoring circuit which automatically shuts down power when either condition is detected. This helps reduce the risk of component damage due to input over-voltage and overcurrent. The controller also incorporates an independent disable pin which allows for quick, reliable shutdown when needed. Overall, the ISL61861AIBZ-T7A is a high-performance hot swap current sense PWM controller by Intersil. Its wide input voltage range, low quiescent current, sense resistor based current limit, adjustable peak current rating and overvoltage protection make it ideal for powering sensitive electronic components. The device utilizes a linearly derived PWM to provide accurate current control, resulting in maximum power efficiency.

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