Power Electronics / Power Management


Point-of-load regulator

24 July 2013 Power Electronics / Power Management

International Rectifier has introduced the IR3847 point-of-load voltage regulator that extends the current rating of the third generation SupIRBuck family up to 25 A in a compact 5 x 6 mm package.

As a result of a new thermally enhanced package using copper clip and several proprietary innovations in the controller, the device can operate at 25 A without a heatsink, and claims to reduce PCB size by 70% compared to discrete solutions using a controller and power MOSFETs. A complete 25 A power supply solution can be implemented in as little as 168 mm².

The IR3847 integrates power MOSFETs with a feature-rich SupIRBuck controller that includes post-package precision dead-time trimming to optimise losses, and internal smart LDO to optimise efficiency across the entire load range.

True differential remote sense essential for high-current applications, 0,5% reference voltage accuracy over the 25°C to 105°C temperature range, input feed-forward and ultra-low jitter combine to enable total output voltage accuracy less than 3% over line, load and temperature, as required by high-performance communications and computing systems.

As part of the new Gen3 SupIRBuck single input voltage (5 V-21 V) family, the IC features a proprietary modulator scheme that reduces jitter by 90% compared to standard solutions. This has the dual benefit of reducing output voltage ripple and allowing higher frequency/higher bandwidth operation for smaller size, better transient response and fewer output capacitors.

Available in a compact 5 x 6 mm PQFN package, the IR3847 offers peak efficiency greater than 96% and temperature rise at 25 A as low as 50°C. Other features include external synchronisation, sequencing, VTT tracking and output voltage margining.

Pinout is optimised for easy placement of bypass capacitors and the internal, thermally compensated current limit offers three settings that allow programmability without extra components and layout complications.

The regulator offers the standard SupIRBuck features of switching frequency up to 1,5 MHz, pre-biased startup, input voltage-aware enable, over-voltage protection, power good, optional true output voltage sensing for open line feedback and adjustable OVP, internal soft-start and minimum input voltage of 1,0 V (with external bias) and operating junction temperatures of -40°C to 125°C. The device is qualified for the industrial market.

For more information contact Marian Ledgerwood, Future Electronics, +27 (0)21 421 8292, marian.ledgerwood@futureelectronics.com, www.futureelectronics.com



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