MB39C831 Datasheet, PDF (10/40 Pages) Cypress Semiconductor – Ultra Low Voltage Boost Power Management IC for Solar/Thermal Energy Harvesting Datasheet

MB39C831
[2] When the VCC reaches 2.9V (upper threshold of VCC detection voltage 1: VCCDETH1), the operation of the start-up circuit
stops, then the DC/DC converter activates charging the VOUT capacitor C3 (see Figure 3-1).
[3] When the VCC reaches less than 2.6V (lower threshold of VCC detection voltage 1: VCCDETL1) by the internal
consumption current, the start-up circuit operates again, and this sequence is repeated until the VOUT becomes 2.9V (upper
threshold of VOUT detection voltage 1: VOUTDETH1).
[4] When the VOUT reaches 2.9V (upper threshold of VOUT detection voltage 1: VOUTDETH1), the internal switch SW1 (see
Figure 3-1) between VCC and VOUT is turned on, and then the VCC and the VOUT are connected internally. While the DC/DC
converter is continuously operated, charging the VOUT capacitor C3 to the preset voltage setting by S2, S1, and S0 pins is
performed.
[5] When the VDD falls and reaches 0.3V (VDD input voltage: VVDD) or less, the voltage of the VOUT and VCC starts to
decreases.
[6] After that the VOUT voltage reaches 2.6V (lower threshold of VOUT detection voltage 1: VOUTDETL1) or the VCC voltage
reaches 2.6V (lower threshold of VCC detection voltage 1: VCCDETL1), and then the internal switch SW1 between VCC and
VOUT is turned off, and the VCC and the VOUT are disconnected internally.
Document Number: 002-08404 Rev *A
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