IR voltage regulator targets consumer electronics
An International Rectifier product story
Edited by the Electronicstalk editorial team Jan 14, 2010
International Rectifier has introduced the IR3870M Supirbuck integrated voltage regulator.
The product is targeted at 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 current sensing to achieve maximum efficiency for notebooks.
Capable of delivering up to 10A in environments with up to 60C ambient temperatures, the IR3870M 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.
The IR3870M has an input-voltage range of 3 to 26V and can be programmed for output voltages of 0.5 to 12V by an external resistor divider network.
The IR3870M has pre-bias startup, very precise 0.5V reference, over- and under-voltage shut down and 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 Supirbuck range integrates IR's high-performance control ICs optimised with Hexfet MOSFETs in a 5 x 6mm, 0.9mm-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 controller IC utilised in the IR3870M is also available as a standalone device - the IR3710M.
This device allows designers that use the IR3870 for lighter loads to easily scale up to loads as high as 24A by using the IC with a pair of external IR MOSFETs.
Both the IR3870M and IR3710 are offered lead free and are RoHS compliant.
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