Step-Down DC-to-DC Synchronous Regulator with Internal Compensation

Sep 21, 2009 11:31 AM

Analog Devices, Inc. (ADI) introduced the ADP2118 dc-to-dc switching regulator. The highly integrated 3A, step-down, dc-to-dc synchronous regulator includes low on-resistance switching FETs to maximize efficiency and features internal loop compensation, a power-good indicator, precision enable, tracking, and synchronization to simplify design of point-of-load power systems. The ADP2118 is designed to support 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 excellent 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 PFM (pulse frequency modulation) to reduce light load losses.

When multiple ADP2118 regulators are used in a system, a simple, reliable start-up sequence can be implemented using the part's power-good, enable and tracking features. ADP2118 devices can be synchronized to eliminate beat frequencies between converters and remove the possibility of audible system noise. The new regulator can be synchronized 180 degrees out of phase to reduce input-current ripple and the size of the input capacitance. 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. The new regulator draws less than 3 µA from the input source when it is disabled.

The ADP2118, rated at -40°C to +125°C, is housed in a 4 mm × 4 mm16-lead LFCSP.

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