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IR’s High Current IR3847 Gen3 SupIRBuck® Delivers Superior Performance, Dramatically Reduces PCB Size By 70% And Simplifies Design

International Rectifier, IR ® (NYSE: IRF), a world leader in power management technology, today announced the introduction of the IR3847 high current Point-of-Load (POL) integrated voltage regulator that extends the current rating of IR’s third generation SupIRBuck ® family up to 25A in a compact 5x6 mm package.

As a result of a new thermally enhanced package using copper clip and several proprietary innovations in the controller, the IR3847 can operate at 25A without heatsink, and reduces PCB size by 20% compared to alternative integrated solutions and 70% compared to discrete solutions using a controller and power MOSFETs. A complete 25A power supply solution can be implemented in as little as 168mm 2.

The new device integrates IR’s latest generation power MOSFETs with a feature-rich, third generation SupIRBuck® controller that includes post-package precision dead-time trimming to optimize losses, and internal smart LDO to optimize efficiency across the entire load range. True differential remote sense essential for high current applications, 0.5% reference voltage accuracy in 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 (5V-21V) family, the IR3847 features a proprietary modulator scheme that reduces jitter by 90% compared to standard solutions. This has the dual benefit of reducing output voltage ripple by approximately 30% and allowing higher frequency/higher bandwidth operation for smaller size, better transient response and fewer output capacitors.

Available in a compact 5x6mm PQFN package, the IR3847 also offers market-leading electrical and thermal performance for 15A – 25A applications such as peak efficiency greater than 96% and temperature rise at 25A as low as 50°C. Other advanced features include external synchronization, sequencing, VTT tracking, and output voltage margining.

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