A global leader in high-performance semiconductors for signal-processing applications, Analog Devices, Inc. (ADI), introduces one of the industry’s smallest buck-boost regulators—and the first to support switching frequencies at speeds up to 2.5 MHz. Designed to regulate voltages above and below the battery output voltage in portable electronics, ADI’s ADP2503 and ADP2504 step-up/step-down dc-to-dc regulators incorporate a patent-pending architecture that delivers seamless mode transitions. Designers are allowed by the ultra-fast switching speed of the new regulators to use low-cost multilayer inductors that are half the size of other solutions. The total external component count, in addition, has been reduced to three, resulting in a total PCB area of less than 13 mm2 and a height of less than 1 mm, making the solution ideal for space constrained applications such as digital still cameras, wireless handsets, portable audio players and USB-powered consumer and industrial devices.
Marketing director for portable power products, Analog Devices, Arcadio Leon, declared: “Many lithium-battery-powered devices require voltage rails in the 2.8-V to 3.6-V range for RF, audio, or motor applications. The ADP2503 and ADP2504 are ideal regulators to provide these voltages when board area and efficiency are important.”
Achieving glitchless mode transitions and outstanding transient performance across line and load, the ADP2503 and ADP2504 regulators are based on ADI’s new proprietary current-mode buck-boost architecture. This high level of output stability is critical for powering sensitive analog and digital circuitry. The devices also feature one of the industry’s lowest no-load quiescent current (Iq) levels—38 µA in power-save mode—which extends stand-by time in portable electronics and/or increases the power budget for the inclusion of additional features. By reducing switching losses, the proprietary H-Bridge buck-boost architecture improves the efficiency by more than 10 percent versus legacy cascaded boost-buck architectures.
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