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PMIC with charger distributes power seamlessly

Posted: 19 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power-management IC? portable application? Li-ion charger?

Maxim Integrated Products has released the MAX8671X power-management IC (PMIC) that provides a single-cell, Li-ion/lithium-polymer (Li-Poly) charger with the Smart Power Selector circuitry that seamlessly distributes power within the system.

To reduce BOM cost, the MAX8671X integrates three 2MHz, step-down DC/DC converters and two low-quiescent-current linear regulators that are capable of providing five regulated output voltages. A complete power-management solution for battery-operated devices, this PMIC is suited for use in smart phones, PDAs, portable media players/MP3 players, GPS navigation devices, digital still/video cameras, and other portable handheld devices.

The MAX8671X's Smart Power Selector circuitry distributes power between a USB/AC-adapter source, battery, and system load. When external power is connected, the Smart Power Selector allows the system to operate with no battery or a deeply discharged battery. It automatically switches the system load from the battery and makes the best use of limited USB or adapter power while charging the battery from input power not used by the system.

Featuring 16V-tolerant, dual (USB and AC/DC) power inputs, the MAX8671X supports end products with dual or single power connectors. All necessary power switches and current-sense circuitry are included on the chip-no external MOSFETs are required. Maxim's Smart Power Selector also provides thermal-limiting circuitry that reduces the battery-charge rate to prevent the charger from overheating.

The MAX8671X is available in a thermally enhanced, space-saving, 5mm x 5mm, 40-pin TQFN package specified over -40C to 85C extended temperature range. Price starts at $2.95 for 1,000-up quantities, FOB USA. An evaluation kit is available to speed designs.

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