IR 3870 M Sup IRBuck Integrated Voltage Regulator

IR 3870 M Sup. IRBuck™ Integrated Voltage Regulator The IR 3870 M Sup. IRBuck™ 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 IR 3870 M 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: 3 V to 26 V • Output voltage range: 0. 5 V to 12 • Continuous 10 A 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. 5 V, +/- 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 PRESS RELEASE DATA SHEETS HI-RES GRAPHIC Su. PIRBuck™ PAGE Advantages • The IR 3870 M 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 IR 3870 is capable of delivering up to 10 A 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 IR 3870 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 IR 3870 M also features pre-boas start-up, very 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 same feature-rich controller IC utilized in the IR 3870 M is also available as a stand-alone device, the IR 3710 M. This device allows designers who use the IR 3870 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.