ISL8491EIB

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ISL8491EIB is an integrated, 1.2 A/1.8 A, synchronous,ful half-bridge DC/DC converter that operates over a wide input voltage range of 4.5V to 28V and is suitable for high current applications. It is designed to drive N-channel MOSFETs in a synchronous buck configuration, allowing for a wide range of output voltage settings. The ISL8491EIB is designed to provide high-efficiency power solutions with minimal external components for space sensitive applications.

Application Field

The ISL8491EIB is well-suited for demanding applications such as point-of-load converters, PoE solutions and server/network power supplies. It is specially designed for the needs of intermediate bus converters to minimize power loss and maximize efficiency. It can replace linear regulators in LED driver applications to reduce cost and increase efficiency. The ISL8491EIB is also suitable for power-on reset circuits and system peripheral power supplies. The combination of the exposed pad construction and internal soft-start circuitry makes it an ideal choice for applications where noise immunity is a priority.

Working Principle

The ISL8491EIB utilizes an adjustable constant on-time control scheme to regulate the output voltage. The output voltage is regulated based on an error signal generated by an internal loop. The internal error amplifier compares the output voltage to the internal reference and adjusts the on-time of the device to regulate the output. The ISL8491EIB also utilizes a zero-voltage transition technique during switching to reduce overall EMI. The ISL8491EIB is also equipped with an internal soft-start feature to reduce inrush current and spread out voltage ramp up transition. Finally, the ISL8491EIB also has an internal circuit for protection against fault conditions such as under-voltage and over-current.

In conclusion, the ISL8491EIB is a high-performance synchronous 1.2 A/1.8 A half-bridge DC/DC converter designed for demanding applications. It uses an adjustable constant on-time control scheme to regulate the output voltage and utilizes a zero-

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