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Universal system manager IC offers battery-backup charge, no-loss calibration

Milpitas, Calif.—Linear Technology's LTC4110 is a complete single-chip battery charge and discharge manager for lithium-ion polymer, nickel-metal-hydride, nickel-cadmium, and sealed lead-acid batteries and super capacitors. The flyback battery charger and discharge manager (handles battery voltages above or below the input supply rail) is suited for server, memory backup, medical equipment, and high reliability system applications.

The LTC4110 features four operating modes: battery backup, battery charge, “no-loss” battery calibration, and shutdown. The LTC4110 can provide a supply voltage to a system load from a main supply or battery and can also charge the battery, thereby providing an uninterruptible power source for the system.

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When the main supply is present, the LTC4110's PowerPath control feature provides power to the system load and, if needed, preferentially and simultaneously charges the battery. If the main supply fails, the LTC4110 uses the battery as a power source through low-loss switches to continue providing a supply voltage to power the system. The low-loss battery calibration mode discharges the battery (through a high efficiency flyback converter) into the system load, thus eliminating wasted heat and energy. Shutdown mode disconnects the battery from the load to preserve capacity.

Multiple LTC4110s can be combined to form a redundant battery backup system or increase the number of battery packs. The IC provides support for both standard and Smart Battery packs. If the optional SMBus/I2 C interface is used, the host may access internal status, control the 3 GPIO pins as desired, and support battery capacity and gas gauge calibration to verify the battery's ability to support the load. The GPIO pins can also be configured as status outputs on power up.

Other features of the LTC4110 include programmable charge/calibration current up to 3 amps with ±3 perent accuracy, wide backup battery supply range of 2.7 to 19 volts, wide input supply range of 4.5 to 19 volts, over- and under-battery voltage protection, adjustable battery float voltage with precision charge voltage of ±0.5 percent, and optional temperature-qualified charging with a thermistor input. A “no-heat” calibration state is provided to assure the battery is maintaining charge. During this calibration state, the energy from the battery is sourced to the load rather than being dissipated as heat.

The LTC4110 is housed in a low-profile (0.75-mm), 38-pin 5-by-7mm QFN package and is guaranteed for operation from -40 to +85°C. Pricing starts at $9.25 each (1k pieces).

Linear Technology , 1-800-4-LINEAR, www.linear.com

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