Integrated voltage regulator maximizes system efficiency for DC-DC applications

International Rectifier has introduced the IR3870M SupIRBuck integrated voltage regulator for notebook and desktop computers, game consoles, consumer electronics applications such as set top boxes, and general purpose point-of-load (POL) DC-DC converters.

The IR3870M features a hysteretic constant on-time modulator with adaptive dead-time control and on-state resistance (RDS(on)) current sensing to achieve maximum efficiency for notebooks. The IR3870M is capable of delivering up to 10 A in environments with up to 60 degrees C ambient temperatures and features diode emulation for improved light load efficiency. The device also offers a charge pump output (CPO) option for enhancing the MOSFET gate drive to deliver highest efficiency at medium to full load conditions. In addition, the IR3870M has a wide input voltage range of 3 V to 26 V and can be programmed for output voltages of 0.5 V to 12 V by an external resistor divider network.

The IR3870M also features pre-bias start-up, precise 0.5 V reference, over- and under-voltage shut down, power good output, and enable input with voltage monitoring capability. The device also offers constant on-time control, programmable switching frequency, soft start, and over-current protection.

The innovative SupIRBuck family of versatile wide input, single output integrated point-of-load (POL) DC-DC voltage regulators integrates IR's high performance control ICs optimized with benchmark HEXFET MOSFETs in a 5 mm x 6 mm, slim 0.9 mm profile power QFN package. With a scalable common footprint, SupIRBuck provides an easy to implement, flexible, compact, cost-effective, high performance POL solution.

The same feature-rich controller IC utilized in the IR3870M is also available as a stand-alone device, the IR3710M. This device allows designers who use the IR3870 for lighter loads to easily scale up to loads as high as 24 A by using the IC with a pair of external IR MOSFETs.

Both the IR3870M and IR3710 are offered lead free and are RoHS compliant.

The IRDC3870 reference design kit featuring the IR3870M is available in addition to the IRDC3710-DF and IRDC3710-QFN reference designs featuring DirectFET MOSFETs and QFN MOSFETs respectively.

Availability and Pricing

Pricing begins at US $2.35 each and US $0.90 each in 1,000-unit quantities respectively for the IR3870MTRPBF and IR3710MTRPBF. The IRDC3870, IRDC3710DF and IRDC3710QFN cost $94.00 per kit. Production orders are available immediately.




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