Step-Down Synchronous Regulator Makes Point-Of-Load Power Simple

The ADP2118 dc-to-dc switching regulator is a 3-A, step-down, synchronous regulator which integrates low on-resistance switching FETs to maximize efficiency. Other features include loop compensation, a power-good indicator, precision enable, tracking, and synchronization to simplify design of point-of-load power systems. The ADP2118 supports high-performance signal-chain loads in applications ranging from medical devices to communications infrastructure equipment. Based on a current-mode, fixed-frequency PWM (pulse-width modulation) architecture that provides high stability and transient response, the ADP2118 operates at high power-conversion efficiencies up to 96%. Under light loads the regulator can be configured to operate in pulse-frequency modulation mode to reduce light-load losses. Multiple ADP2118 regulators can be synchronized to eliminate beat frequencies between converters and remove the possibility of audible system noise. The ADP2118 features a 600-kHz or 1.2-MHz fixed switching frequency and operates from a wide 2.3-V to 5.5-V range to accommodate a diversity of point-of-load applications. The output voltage of the ADP2118 is adjustable from 0.6 V to input voltage (VIN), and it is available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V. Pricing for a 4 mm x 4 mm, 16-lead LFCSP is $1.90 each in lots of 1000. ANALOG DEVICES INC., Norwood, MA. (781) 329-4700.