IR’s high current IR3847 Gen3 SupIRBuck delivers superior performance

USA: International Rectifier, (IR) 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 percent compared to alternative integrated solutions and 70 percent compared to discrete solutions using a controller and power MOSFETs. A complete 25A power supply solution can be implemented in as little as 168mm2.

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 percent 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 percent 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 percent and allowing higher frequency/higher bandwidth operation for smaller size, better transient response and fewer output capacitors.