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Switching regulator touts output tracking, FPGA sequencing

Posted: 11 Mar 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Intersil? switching regulator? FPGA? MPU? DC/DC converter?

Intersil Corp. has introduced a synchronous buck (step-down) switching regulator that offers up to 2A of continuous output current from a 2.7V to 5.5V input supply. The ISL8002B boasts 2MHz switching frequency to deliver superior transient response, and flaunts greater system reliability through several innovative features, stated the company.

The device features programmable soft-start, and output tracking and sequencing of FPGAs and microprocessors to increase system reliability for point-of load conversions in networking, factory automation, instrumentation and medical equipment, detailed Intersil.

The ISL8002B supports output tracking and sequencing of FPGAs and MPUs to ensure that sensitive multi-rails properly start up and shut down. In addition, its output rails are configurable for coincidental, ratiometric, or sequential settings, guaranteeing the FPGA or MPU's internal ESD diodes are not biased or overstressed during rising or falling outputs. The ISL8002B's undervoltage lockout and several other protection/stability features (overvoltage, overcurrent, undercurrent, negative current, over temperature and short-circuit) safeguard the system from damage when an unwanted electrical fault event occurs. And its unique negative current protection prevents switch failure, noted the company.


The ISL8002B's promises to enable a complete synchronous step-down DC/DC converter solution in a compact footprint. By integrating low RDS(ON) high-side PMOS and low-side NMOS MOSFETs, the buck regulator eliminates the need for a bootstrap capacitor and diode, and its high efficiency allows the use of small inductors to further reduce board space.

The ISL8002B synchronous buck regulator is available in a 2mm x 2mm, 8-pin TDFN package and is priced at $1 in 1,000 quantities. The ISL8002BDEMO1Z demonstration board can be had for $23 each.

Complementing the ISL8002B is the ISL8022 dual 2A output 5V synchronous buck regulator without the tracking feature, and the ISL85003 4.5V to 18V, 3A synchronous buck regulator that can be combined with the ISL8002B in a two-stage solution to convert a 12V rail to a 5V rail. The ISL85403 also can be combined in a two-stage solution with the ISL8002B to step-down a 24V rail to a 5V rail.

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