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Voltage regulator operates at 25A without heatsink

22 Mar 2013

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 IR3847 Gen3 SupIRBuck

International Rectifier (IR) has debuted the IR3847 high current point-of-load (POL) integrated voltage regulator that extends the current rating up to 25A in a compact 5 x 6mm PQFN package. The IR3847 can operate at 25A without heatsink, and promises to cut PCB size by 20 per cent compared to alternative integrated solutions and 70 per cent compared to discrete solutions using a controller and power MOSFETs. A complete 25A power supply solution can be implemented in as little as 168mm2, added the company.

The 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 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 per cent 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 three per cent over line, load and temperature, as required by high performance communications and computing systems, detailed IR.

As part of the Gen3 SupIRBuck single input voltage (5-21V) family, the IR3847 features a proprietary modulator scheme that reduces jitter by 90 per cent compared to standard solutions. This has the dual benefit of reducing output voltage ripple by nearly 30 per cent and allowing higher frequency/higher bandwidth operation for smaller size, better transient response and fewer output capacitors.

The IR3847 also offers market-leading electrical and thermal performance for 15-25A applications such as peak efficiency greater than 96 per cent and temperature rise at 25A as low as 50°C, stated the firm. Other advanced features include external synchronisation, sequencing, VTT tracking and output voltage margining.

The 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 IR3847 offers the standard SupIRBuck features of switching frequency up to 1.5MHz, pre-biased start-up, 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 1V (with ext. bias) and operating junction temperatures of -40°C to 125°C. Finally, it is qualified for the industrial market.

Pricing for the IR3847M begins at $2.23 each in 100,000-unit quantities. The IRDC3847 reference design can be purchased for $29 per kit.

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