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Dual-input linear charger

Maxim Integrated Products has introduced the MAX8934, a dual-input linear charger with Smart Power Selector circuitry to implement the Japan Electronics and Information Technology Industries Association recommendations for safe charging over temperature. The device 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 provides a compact solution for one-cell, Li+-powered handheld devices such as smartphones, digital still cameras, media players, gaming systems, or GPS navigation systems. The device 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.