Compact buck-boost regulators

1 October 2008 Power Electronics / Power Management

Analog Devices has introduced what it claims is 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, the ADP2503 and ADP2504 step-up/step-down DC-DC regulators incorporate a patent-pending architecture that delivers seamless mode transitions. The regulators feature no-load quiescent current (Iq) of 38 μA in power-save mode, which extends standby time in portable electronics and/or increases the power budget for the inclusion of additional features. They operate at input voltages ranging from 2,3 V and 5,5 V, which meets the requirements for single Li-Ion, Li-Ion polymer cell and multiple alkaline/NiMH cell applications. Fixed output voltages range from 2,8 V to 5 V.

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