Synchronous POL regulator targets low-voltage ICs in Rad-Hard systems

Intersil Corporation has released what the company claims is the industry's most reliable, efficient, single-chip POL synchronous buck regulator for satellite systems, nuclear reactor equipment, down hole drilling applications, and other high-reliability systems.

The new ISL70001SRH is a complete power solution designed for use in systems that required POL power in extreme temperature and radiation-intensive environments. It integrates 6 A power MOSFETs, MOSFET drivers and a 1 MHz PWM controller in a single compact package. Two ISL70001SRH devices can be synchronized 180 degrees out-of-phase to reduce input RMS ripple current and the size of input filter components.

The regulator offers superior single event transient (SET) performance, with < 1 pulse perturbation at the switching node up to an LET = 86.4MeV/mg/cm squared. Total ionizing dose (TID) capacity is 100Krads(Si) and is offered in Class V and Class Q manufacturing flows electrically screened to DSCC SMD# 5962-09225. The combination of excellent SET and TID characteristics makes the ISL70001SRH a logical design choice to power many of today's small form-factor applications.

The ISL70001SRH operates over an input voltage range of 3 V to 5.5 V and provides a tightly regulated output voltage that is externally adjustable from 0.8 V up to 85 percent of the input voltage. Output current capability is 6A for TJ up to +145 degrees C. An analog soft-start circuit controls start-up, and can be adjusted from approximately 2 ms to 200 ms using an external capacitor. In addition, the ISL70001SRH incorporates fault protection for the regulator, with protection including input undervoltage, output undervoltage and output overcurrent.

Availability and Pricing

Intersil offers Class V and Class Q manufacturing flows for the ISL70001SRH, which comes in a 48-lead ceramic quad flatpack (CQFP) and is also offered in class V die. Sample quantity pricing for the ISL70001SRHVF starts at $4,546 each for less than 25 pieces. The ISL70001SHR/proto is priced at $857.

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