
Allicdata Part #: | ISL61861BCBZ-T-ND |
Manufacturer Part#: |
ISL61861BCBZ-T |
Price: | $ 0.67 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | Intersil |
Short Description: | IC USB PWR CTRLR 1.5A 8SOIC |
More Detail: | Hot Swap Controller 2 Channel USB 8-SOIC |
DataSheet: | ![]() |
Quantity: | 1000 |
Moisture Sensitivity Level (MSL): | 2 (1 Year) |
Lead Free Status / RoHS Status: | Lead free / RoHS Compliant |
2500 +: | $ 0.60386 |
Programmable Features: | -- |
Base Part Number: | ISL61861 |
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: | 0°C ~ 70°C |
Current - Output (Max): | 1.5A |
Voltage - Supply: | 2.5 V ~ 5.5 V |
Series: | -- |
Features: | Auto Retry, Fault Timeout, 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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ISL61861BCBZ-T Application Field and Working Principle
ISL61861BCBZ-T is a hot swap controller IC produced by Intersil Corporation, which provides a combination of circuit protection, hot swap control, remote sensing, and adjustable soft start. It is designed primarily with high-current/high-density power-distribution systems and datacoms applications in mind. This particular product is suitable for applications with low ripple and fast transient response like networks and DC power supplies. Part of the InterSil family of Hot Swap controllers, the ISL61861BCBZ-T is the 5th generation of the ISL61850 series.
Hot Swap controllers are semiconductor devices used to control the power delivery to a device that is being "hot swapped" or inserted into a system while the system and the device are operating. Hot swap is a process that enables a system to be changed or upgraded without having to be shutdown. Since having hotter components in the same system is not safe, and many systems require a cooling period before changing a device, the introduction of hot swap controllers have provided an improved way to implement device upgrades without having to shut down the system. Hot swap controllers control the power up and down sequence of power supply voltage levels and inrush currents present during the power up and down process.
Overview
The ISL61861BCBZ-T Hot Swap controller employs a new, low quiescent current (typically only 1.2uA) design with a wide input voltage range of VIN_H to VIN_L. It provides protection against over current, over voltage, and over temperature faults. It also offers remote sense capability that enables the system to detect current source variance from the source side of the inductor. Additionally, it provides gate drive circuitry and adjustable soft start, aiding in the power-up sequencing of the system\'s power supply rail.

Figure 1: Feature of ISL61861BCBZ-T
The ISL61861BCBZ-T Hot Swap controller is a compact solution, operating from 1.2V to 3.6V, which is suited for high-density PoE and DC-DC power supply applications. Features include an adjustable current limit of 5A, a preset over-voltage level, adjustable soft start, remote short circuit and over-temperature protection.
Working Principle
The main feature of a Hot Swap controller, such as the ISL61861BCBZ-T, is the ability to control and protect the power supply up and down sequence of a system that is experiencing a "Hot Swap" process.
The Hot Swap process involves power cycling the device/system while it is running, or as it termed "Hot Swap" where the device is inserted while the system is running. When the device is "hot swapped", the power controller monitors the power supply voltage levels and inrush currents present during the power up and down process. It also monitors the temperature of the device and protects the system from excessive power.

Figure 2: Block Diagram of ISL61861BCBZ-T IC
The ISL61861BCBZ-T Hot Swap controller IC utilizes a Driver IC and Comparator IC. The ISL61801 driver IC sources current to the gate of an external N-channel MOSFET to provide output voltage regulation. This way, the ISL61801 driver IC provides over-voltage protection and protection against over-currents and over-temperatures. The Comparator IC monitors the output voltage and limits the current to guarantee that the output voltage remains within specified levels.
The Hot Swap IC also has the benefit of remote sensing capability - by using an RSENSE pin, the ISL61861BCBZ-T can detect fluctuations in the power delivery path. It can also monitor short circuit conditions in the load path. This is important for applications where spontaneous board failure is a possibility.
The ISL61861BCBZ-T controller\'s soft start capability allows the user to program the time it takes for the voltage output to reach its full value. This helps to ensure that high-power components are not shocked when the voltage output reaches the higher levels. It also helps the controller to keep power consumption to a minimum by not exceeding the maximum rated power of the component.
Conclusion
The ISL61861BCBZ-T Hot Swap controller provides a useful combination of circuit protection, hot swap control, remote sensing, and adjustable soft start. It is designed to protect components from voltage transients, current surges, and over-temperatures by providing programmable over-voltage and over-current limits, remote sensing capability, and adjustable soft start. The ISL61861BCBZ-T is an ideal solution for high-current/high-density power-distribution systems, DC power supplies, and datacoms applications.
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