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Power/Alternative Energy??

Power-management ICs offer integrated charger

Posted: 23 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power management? Maxim? charger? xx? xx?

Maxim Integrated Products has introduced two highly integrated power-management ICs with USB/AC-adapter linear charger and Smart Power Selector. MAX8662 and MAX8663 are suitable for smartphones, PDAs, portable media players and other portable devices powered by rechargeable single-cell Li+ batteries.

Smart Power Selector
The devices use Maxim's proprietary Smart Power Selector circuitry to efficiently distribute power between a USB/AC-adapter source, the 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. All necessary power switches and current-sense circuitry are included on the chip.

MAX8663 integrates two high-efficiency, step-down DC/DC converters; four LDOs; and a full-featured charger with Smart Power Selector. MAX8662 adds a step-up DC/DC converter for up to seven WLEDs or OLED displays. The two step-down DC/DC converters offer up to 97 percent efficiency, provide a 1-3.3V adjustable output and support 1.2A and 900mA loads. The four LDOs support 500-, 300- and two 150mA loads. To minimize power loss, they operate from a 1.7-5.5V input-voltage range. Additionally, the LDOs have selectable output voltages to eliminate external resistor-dividers and minimize board space.

Charger features
The charger's DC-input current limit is adjustable up to 2A and supports 500mA, 100mA and USB-suspend modes. Charge current is adjustable up to 1.5A to accommodate a wide range of battery capacities. Other charger features include thermal regulation, overvoltage protection, charge status and fault outputs, a power-OK monitor, a battery-thermistor monitor and a charge timer.

MAX8662 is available in a thermally enhanced, 6-by-6mm, 48-pin TQFN package; MAX8663 is available in a thermally enhanced, 5-by-5mm, 40-pin TQFN package. These devices are specified for the extended temperature range (-40C to 85C). Prices start at $3.95 (1,000-up, FOB USA). Evaluation kits are available to speed designs.




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