Electronic Design

Efficient POL Voltage Regulators Reduce System Size

The second generation (Gen2) of International Rectifier’s SupIRBuck integrated point-of-load (POL) voltage regulators targets energy-efficient high-performance server, storage, and networking communications applications. These devices deliver 4-, 8-, and 12-A output current with benchmark efficiency over the entire load range, according to the company. While optimized for 12-V input voltage, IR also says, the regulators achieve superior efficiencies in applications with 9.6-, 5-, or 3.3-V input voltages.

The SupIRBuck devices provide up to 1.5 MHz of switching frequency to allow the use of smaller inductors and fewer output capacitors. Tailored for data center applications, they provide features that are designed to significantly reduce overall system complexity and size. Their efficiency and thermal properties deliver full current rating with no airflow and without a heatsink while allowing backside mounting on a motherboard for additional space savings.

According to the company, the SupIRBuck delivers benchmark peak efficiencies higher than 96% for greater energy savings and system reliability, as well as a very high switching frequency for significant overall size reduction. Also, the family’s common scalable 5- by 6- by 0.9-mm footprint provides a high level of flexibility to adapt to changing output current requirements for an east-to-implement, low-risk solution optimized for space-constrained, high-performance applications, says IR.

The SupIRBuck family additionally offers a wide input voltage range of 1.5 to 16 V with 5-V bias and a wide output voltage range of 0.7 V to 90% VIN. Other features include overcurrent and overtemperature protection, programmable switching frequency, enable input with input voltage monitoring capability, hiccup current limit, soft-start, power good output, advanced pre-bias startup, 1% accurate 0.7-V reference voltage, sequencing, and a dedicated device for double-data-rate memory tracking.

The devices in the SupIRBuck family are lead-free and halogen-free, and they comply with the European Union’s Restrictions on Hazardous Substances (RoHS). The IR3842 starts at $1.20, the IR3831 and IR3841 begin at $1.30 each, and the IR3840 starts at $1.75 each, all in 10,000-unit quantities. Prices are subject to change. Production orders are available immediately.

International Rectifier

www.irf.com

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