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Switched-Mode battery topology delivers charging efficiency

Intersil has added to its family of compact battery chargers by introducing the new ISL9220. The device is based on a true switched-mode topology that ensures high operating efficiency and low power dissipation for 1-cell and 2-cell Li-ion and Li-polymer based portable applications such as smartphones and tablet computers. The device minimises charge time while providing maximum power efficiency and heat reduction using synchronous pulse width modulation technology with integrated MOSFETs. The device's 1.2MHz switching frequency allows the use of small external inductors and capacitors. The device provides up to 2A charge current and charge voltage accuracy is 0.5%. Programmable input current limiting is included along with programmable pre-charge and fast charge settings. Integrated overvoltage protection on the adapter/USB power input protects both the battery and circuitry from damage due to excessive voltage on the input. A programmable safety timer is provided to terminate charging if the battery fails to charge in the programmed period. The device can also monitor the battery temperature and discontinue charging if the temperature becomes unsafe.