ISL8105IBZ

Frequency - Switching:	300kHz
Base Part Number:	ISL8105
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	6.5 V ~ 14.4 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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ISL8105IBZ Application Field and Working Principle

ISL8105IBZ is a DC/DC switching regulator control integrated circuit (IC) designed for high performance, low voltage and low-power applications. This device belongs to the PMIC - Voltage Regulators - DC DC Switching Controllers, and has been optimized for use in the implementation of efficiency, cost effectiveness and flexibility in the engineering design of high-performance DC/DC switching regulator power supplies.The ISL8105IBZ IC contains a high-voltage start-up, low-side FET driver circuit, charge pump, and precision voltage comparators. It also has a logic monitor and protection circuitry that monitors the input voltage, output voltage, and current. The output voltage is regulated by a 1.2A low-side MOSFET switch and an integrated current-limit circuit, while the input and output are monitored by an external resistor divider and precision comparators.The output voltage of the device is adjustable over an output voltage range of 0.75V to 5V and is controlled by a single resistor connected between the FB pin and ground. The regulation level is set by the reference voltage on the internal regulator. The ISL8105IBZ also includes an on-board Hall Effect current sense for precise current sensing.The ISL8105IBZ can be used in applications such as battery charging, portable medical and industrial applications, security systems, industrial automation and control systems, and other applications requiring low-voltage, low-power DC/DC switching regulators.In terms of its operation, one of the main components of the ISL8105IBZ is the high voltage start-up, low-side MOSFET driver circuit. The MOSFET driver allows the device to start up without the need of an external power source (such as a battery). The regulator is also configured to prevent inrush current, as well as to protect against under-voltage and over-voltage.In addition, the ISL8105IBZ also features a Fault Output pin that can be used to indicate any faults to other control ICs or a microcontroller. The fault output pin is active low so that it can be used to enable a fault condition in case of an over-voltage, under-voltage, or over-temperature condition.The ISL8105IBZ also includes an integrated charge pump that allows for a low-cost and low-profile solution. This circuit regulates the output voltage, even in applications with high ripple as found in some portable medical, industrial, and other applications.Finally, the internal logic circuit of the ISL8105IBZ allows for a significant amount of flexibility and provides the designer with options for component selection and operation. One such feature is the logic monitor that can be used to measure the input voltage, output voltage, and current in order to ensure the device is operating properly.In summary, the ISL8105IBZ is an excellent choice for power supplies requiring an efficient and cost-effective solution. It is designed to provide high performance and a wide range of features in low-voltage and low-power applications. The device is a DC/DC switching regulator control IC that features a high-voltage start-up, low-side FET driver circuit, charge pump, precision voltage comparators, logic monitor and protection circuitry, an on-board Hall Effect current sense, and an integrated charge pump.

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