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STMicroelectronics Releases New Solar Charger IC for Miniature Cells


Solar battery charger to apply maximum power tracking for miniature cell arrays, keeping millions of portable devices running longer


The small strips of solar cells seen in the front panels of todayís small portable consumer, healthcare and security devices are set to become a more valuable source of free energy with help from a new advanced battery charging IC from STMicroelectronics. The new IC will significantly increase charging efficiency either indoor or outdoor, using the sunís radiated energy, enabling longer mobile equipment runtime and avoiding an unexpected lack of power when a mains connection is not available.


STís SPV1040 is a step-up DC-DC converter tailored to be used as solar battery charger for portable applications to employ Maximum Power Point Tracking (MPPT), an innovative technique for collecting the maximum possible energy from solar cells. It can be connected to strips of even just a few cells, allowing use in products such as portable healthcare devices, watches, calculators, wireless headsets, toys, or mobile phones. The battery charger and MPPT technology can also be used in equipment such as sensors and security cameras.

The MPPT algorithm embedded in the SPV1040 dynamically adjusts the chargerís input impedance to ensure perfect matching with the solar cell, thereby maximizing energy transfer to the battery and dramatically improving overall system efficiency. Without MPPT, changes in the solar cells caused by temperature, ageing, dirt or unit-to-unit variation can produce mismatches that significantly reduce the energy harvested.

Features of the SPV1040 Solar Charger IC Include:

  • Input-voltage Range: 0.3V to 5.5V
  • Integrated low-loss synchronous rectifier and power switch
  • Up to 95% efficiency
  • Shutdown pin to aid system-level power management
  • Thermal shutdown and protection circuitry to improve battery and overall system safety

The company's Web site address is http://www.st.com/.
[Reprinted with kind permission from ST Microelectronics]


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