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'Smallest' PMIC rolls for portable media players

Posted: 17 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power management? PMIC? portable media player?

Maxim Integrated Products has released what it claims to be the smallest power management IC (PMIC) that integrates a single-cell Li-ion/lithium-polymer (Li-Poly) charger with proprietary Smart Power Selector circuitry that seamlessly distributes power within the system.

To reduce BOM cost, the MAX8819A integrates three 2MHz step-down converters and one step-up converter with serial-step dimming control for powering two to six white LEDs. Offering a solution footprint of less than 90mm x 90mm with a low 1mm height, the MAX8819A is touted to be the smallest complete power management solution for battery-operated devices. This device is suitable for use in portable media players, MP3 players, GPS devices and other handheld applications.

The MAX8819A's Smart Power Selector circuitry manages power distribution between a battery, USB/AC/DC adapter, and system load. When a USB or AC/DC adapter is connected, the input power that is not used by the system load is used to charge the battery. In addition, Smart Power Selector circuitry allows the system to operate with no battery or a deeply discharged battery. The Smart Power Selector also provides thermal-limiting circuitry that reduces the battery-charge rate to prevent the charger from overheating. All necessary power switches and current-sense circuitry are included on the chip-no external MOSFETs are required.

Integrating one 28V step-up and three fully synchronous, step-down switching regulators, the MAX8819A offers up to 95 percent efficiency for the full load range to maximize standby and runtime operation. The step-down regulator's 2MHz switching frequency allows the use of small capacitors and inductors with a low 1mm profile.

The MAX8819A is available in a thermally enhanced, space-saving, 4mm x 4mm x 0.8mm, 28-pin TQFN package that is fully specified over the -40C to +85C extended temperature range. Prices start at $3.65 (1,000-up, FOB USA). An evaluation kit is available to speed designs.

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