IR3870M SupIRBuck ™ Integrated Voltage Regulator

1. PRESS RELEASE IR3870M SupIRBuck™ Integrated Voltage Regulator DATA SHEETS 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. HI-RES GRAPHIC SuPIRBuck™ PAGE • 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. • 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