Step-down dc-to-dc Synchronous Regulators

Aug 25, 2010 1:24 PM

Analog Devices, Inc. (ADI) introduced the ADP2119 and ADP2120 dc-to-dc switching regulators, the latest in ADI's portfolio of integrated power management switching regulators. The highly integrated 2A/1.25A, step-down, dc-to-dc synchronous regulators include low on-resistance switching FETs (field-effect transistors) that deliver power conversion efficiencies up to 93 percent. Internal loop compensation and integrated soft-start circuitry are also featured and enable high-density solutions for point-of-load applications. The ADP2119 and ADP2120 accommodate a diversity of point-of-load applications with a 1.2-MHz fixed switching frequency and a wide 2.3-V to 5.5-V operating range. Output voltage is adjustable from 0.6 V to input voltage (VIN), and 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 ADP2119 and ADP2120 regulators are available in small 3 mm x 3 mm LFCSP (lead-frame chip-scale package) packages.

ADP2119 and ADP2120 dc-to-dc Switching Regulators Features:

• Current-mode, fixed-frequency PWM (pulse-width modulation) architecture provides excellent stability and transient response
• Power-good output, precision-enable and voltage tracking features enable a simple and reliable start-up sequence
• Regulators can be synchronized to eliminate beat frequencies between converters and remove the possibility of audible system noise
• OVP (over-voltage protection), OCP (over-current protection), UVLO (under-voltage lockout) and TSD (thermal shutdown) enhance system reliability and protection.

The ADP2119 and ADP2120 regulators and previously announced ADP2118 are well suited for establishing distributed low-noise analog rails to support other Analog Devices components, including the latest generation of ADCs (analog-to-digital converters), amplifiers and DACs (digital-to-analog converters).

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