Transcript IR3870M SupIRBuck™ Integrated Voltage Regulator

IR3870M SupIRBuck™
Integrated Voltage Regulator
The IR3870M SupIRBuck™ is an 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 IR’s latest advances in control IC, MOSFET and package
integration technologies and is an easy-to-use and fully integrated
DC-DC voltage regulator designed to deliver maximum efficiency
in systems that require light load as well as full load performance.
Features
• Input voltage range: 3V to 26V
• Output voltage range: 0.5V to 12
• Continuous 10A load capability
• Constant on-time control
• Excellent efficiency at very low output current
levels
• Gate drive charge pump option to maximize
efficiency at higher output current levels
• Compensation loop not required
• Programmable switching frequency, soft start,
and over current protection
• Power good output
• Precision voltage reference (0.5V, +/- 1%)
• Enable input with voltage monitoring capability
• Pre-bias start up
• Under/over voltage fault protection
• Ultra small, low profile 5 x 6 mm QFN package
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SuPIRBuck™
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Advantages
• 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 IR3870 is capable of delivering up to 10A in environments with up to
60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.
• The IR3870 has a wide input voltage range of 3V to 26V and can be
programmed for output voltages of 0.5V to 12V by an external resistor
divider network.
• The IR3870M also features pre-boas start-up, very precise 0.5V
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 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 24A by using the IC with a pair of external IR MOSFETs.