ISL61851GIBZ

Programmable Features:	--
Base Part Number:	ISL6185
Feature Pins:	/EN1, /EN2, /FLT1, /FLT2
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Current - Supply:	50µA
Operating Temperature:	-40°C ~ 85°C
Current - Output (Max):	1.1A
Voltage - Supply:	2.3 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:	Tube

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Introduction to ISL61851GIBZ

The ISL61851GIBZ is an integrated hot swap controller for applications needing to prevent out of spec voltages from being applied to sensitive loads in the event of a short circuit fault. This hot swap controller provides inrush current limiting and power good indicator. It comes in a small, thermally-enhanced 8-lead SOIC (D) package.The ISL61851GIBZ is a Hot-Swap controller designed to limit inrush current and to protect sensitive loads (e.g., microprocessors, ASICs, etc.) against hazardous voltages caused by overvoltage or transient conditions. It is specifically designed to realize a maximum integrated solution providing a cost effective and space efficient design. The device is equipped with an internal MOSFET driver featuring a low-impedance source for minimal voltage drop.

Features of ISL61851GIBZ

The ISL61851GIBZ Hot Swap Controller offers many features such as its support of high power devices, wide voltage range range, flexible under-voltage lockout (UVLO), externally adjustable slew rate, inrush current limiting with external current setting, programmable resistive current sensing, power good indicator (PGOOD), fault condition indicator (FAULT#), internally regulated Soft-Start, and over-current protection.• Support of high power devices:The ISL61851GIBZ can support up to 3A continuous current on VOUT and can handle up to 45A/50ns transients.• Wide voltage range:The ISL61851GIBZ provides an adjustable resistance between 8V to 15V.• Flexible under-voltage lockout (UVLO):The ISL61851GIBZ incorporates an adjustable UVLO that is configured in the start-up sequence.• Externally adjustable slew rate:The ISL61851GIBZ provides an adjustable soft-start time for load surge current control.• Inrush current limiting with external current setting:The ISL61851GIBZ features a programmable soft start period for inrush current control when the device is first activated.• Programmable resistive current sensing:The ISL61851GIBZ allows for the user to program a resistive current sensing element for monitoring the amount of current drawn from the device.• Power good indicator (PGOOD):The PGOOD is an active high output that the user can monitor to indicate whether the power supply is operating at its specified voltage and current.• Fault condition indicator (FAULT#):The ISL61851GIBZ is equipped with an open-drain indicator output to indicate a fault condition. This can be used to provide a warning to further peripherals when a system falters.• Internally regulated Soft-Start:The ISL61851GIBZ incorporates an internal soft-start feature to prevent excessive input inrush currents.• Over-current protection:The ISL61851GIBZ is designed to provide additional current protection in the event of a short circuit.

Applications of ISL61851GIBZ

The ISL61851GIBZ Hot Swap Controller is suitable for applications where there is a need for maximum protection and safety due to current inrush. It is ideal for high power applications such as servers, server farms, enterprise and industrial applications. Such applications include server chassis, embedded systems, automotive, and computer peripherals.

Working Principle of ISL61851GIBZ

The ISL61851GIBZ Hot Swap Controller works by monitoring the input voltage and intervening if it is too high or too low. It relies on external voltage regulation and uses an internal MOSFET to switch the load on and off and to control the load current. When activated the device slowly brings the load up to its desired voltage level and is equipped with features to protect against input and output overvoltage and overcurrent. The Power Good (PGOOD) signal is an active high output that indicates when the output is within the specified voltage and current requirements. In the event of a fault, such as an overcurrent condition, the device is shut down and enters into a fault condition indicated via an open-drain output. The device can be reset once the fault condition has been cleared.

Conclusion

The ISL61851GIBZ is an integrated Hot Swap Controller designed to protect sensitive loads from hazardous voltages caused by overvoltage or transient conditions. It has many features such as its support of high power devices, wide voltage range, flexible under-voltage lockout (UVLO), externally adjustable slew rate, inrush current limiting with external current setting, programmable resistive current sensing, power good indicator (PGOOD), and fault condition indicator (FAULT#). It is suitable for applications such as servers, server farms, embedded systems, automotive, and computer peripherals.

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