STMicroelectroncis : Power manager regulates harvested energy to charge any battery – SPV1050

The SPV1050 from STMicroelectronics is a highly efficient Power-Management Unit (PMU) for photovoltaic and thermoelectric generation energy-harvesting systems.

Highly integrated, it implements the Maximum Power Point Tracking (MPPT) function for solar and thermal differential power generation, and includes the switching elements of a boost and
a buck-boost converter.

The SPV1050 device can charge any battery, including thin-film batteries, monitoring the end-of-charge and minimum battery voltages in order to avoid over-discharging and to prolong battery life. In addition, the SPV1050 can trim both the end-of-charge and the under-voltage protection voltages, providing for flexible application to any battery type.

The PMU supports an input voltage range from 75mV to 18V, and offers high efficiency in both buck-boost and boost configurations, even when the input power is extremely low.

Both the charge and discharge voltages are regulated to an accuracy of ±1%.

The MPPT algorithm is programmable by a resistor input divider. It enables the system to maximise the source power under any temperature and irradiance conditions.

An additional unregulated voltage output is available, and may be used for instance to supply a microcontroller, while two fully independent LDOs are provided for powering any companion device such as sensors, an MCU or an RF transceiver.


  • Up to 70mA battery-charging current
  • Trimmable battery-charge voltage range: 2.6V to 5.3V
  • Trimmable battery-discharge voltage range: 2.2V to 3.6V
  • Embedded MPPT with Disable option
  • Battery connected and battery charge indication pins


  • Battery-charging applications using harvested energy