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Linear Charger Adjusts Charge Rate According to Temperature

Thu, 04/01/2010 - 5:34am
8934rgbMaxim Integrated Products (NASDAQ: MXIM) introduces the MAX8934, the industry's first dual-input linear charger with Smart Power Selector(TM) circuitry to implement the JEITA (Japan Electronics and Information Technology Industries Association) recommendations for safe charging over temperature. The MAX8934 monitors battery temperature and automatically adjusts the charge current and termination voltage to a safe level according to temperature. When external power is connected, the Smart Power Selector circuitry allows the system to operate with no battery or a deeply discharged battery, and automatically switches the system load from the battery. All necessary current-sense circuitry and power switches for charging and switching the load between the battery and external power are integrated. This results in an ideal compact solution for one-cell, Li+-powered handheld devices such as smartphones, digital still cameras, media players, gaming systems, or GPS navigation systems.

The MAX8934 operates with either separate inputs for USB and AC adapter power, or from a single input that accepts both. The DC input's current limit is adjustable up to 2A; the USB input's current limit is adjustable to 1.5A*. Both DC and USB inputs support 100mA, 500mA, 1.5A, and USB-suspend modes. Charge current is adjustable up to 1.5A to support a wide range of battery capacities. Other features include a thermal regulation loop to prevent overheating, adaptive battery charging to prioritize support of system load over charge current, OVP (overvoltage protection), open-drain charge status and fault outputs, power-OK monitors, charge timers, and a battery thermistor monitor.

The MAX8934 is available in a space-saving, thermally enhanced, 4mm x 4mm, 28-pin TQFN package that is fully specified over the -40 degrees Celsius to +85 degrees Celsius temperature range. Prices start at $2.03 (1000-up, FOB USA). An evaluation kit is available to facilitate designs.

Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 6300 products serving the industrial, communications, consumer, and computing markets.

Maxim reported revenue in excess of $1.6 billion for fiscal 2009. A Fortune 1000 company, Maxim is included in the Nasdaq 100, the Russell 1000, and the MSCI USA indices. For more information, go to www.maxim-ic.com.

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