The CY39C831 from Cypress Semiconductor is a high-efficiency synchronous rectification boost dc-dc converter IC which efficiently supplies energy harvested from a solar cell with the single cell or multiple cells, or from a thermoelectric generator (TEG) to the Li-ion battery.
It is possible to start-up from 0.35V and it contains the function to control the dc-dc converter output following the maximum power point of the solar cell and the protection function to charge the Li-ion battery safely.
Applications are expected to include solar energy harvesting, thermal energy harvesting, Li-ion battery using the single cell or multiple cells' solar cell/super capacitor charger, portable audio players, cellular phones, eBooks, electronic dictionaries, wireless remote controllers, sensor nodes, and so on.
This converter has function controls for the synchronous rectification operation of the integrated FET using the frequency set by the built-in oscillator. The converter operates in PFM at light load currents.
It is equipped with a constant voltage mode and a charge mode. In constant voltage mode, the output voltage is set by the S2, S1 and S0 pins. In charge mode, the input voltage is adjusted by following the MPPT value set by S2, S1, and S0 pins and a Li-ion battery can be charged.
Key Features:
- Power Converter Type: Boost
- Temperature Range: -40˚C to +85˚C
- Quiescent Current: 32µA
- Input Voltage Range: 0.3V to 4.75V
- Output Voltage (V): 3.0, 3.3, 3.6, 4.1, 4.5, 5.0
- Built-in MPPT
- Charge voltage to the Li-ion battery/current protection function built in
- Improvement of the efficiency during the low-output power according to the auto PFM/PWM switching mode
- Package: 40-pin QFN
