MB39C831 Datasheet, PDF (15/40 Pages) Cypress Semiconductor – Ultra Low Voltage Boost Power Management IC for Solar/Thermal Energy Harvesting Datasheet

MB39C831
Table 7-3 Changing MPPT Setting in Charge Mode (MPPT_ENA = H, ENA = H)
MPPT_ENA pin
ENA pin
H
H
Input Signal
S2 pin
L
L
L
L
H
H
H
H
S1 pin
L
L
H
H
L
L
H
H
S0 pin
L
H
L
H
L
H
L
H
Control
MPPT Values
50%
55%
60%
65%
70%
75%
80%
85%
VCC Detection1, 2 (VCC Detection Voltage1, 2): VCC Voltage Protection
This function works with both the constant voltage mode (MPPT_ENA =L) and the charge mode (MPPT_ENA =H).
 Constant voltage mode (MPPT_ENA =L)
The detection that the VCC pin is equal to the threshold voltage (VCCDETH1 = 2.9V) or higher is the source to start the
DC/DC converter operation. It’s a factor to turn on the internal switch between VCC and VOUT.
It has the hysteresis, and the detection that the VCC pin is equal to the threshold voltage (VCCDETL1 = 2.6V) or lower is
the source to stop the DC/DC converter operation. It’s a factor turn off the internal switch between VCC and VOUT.
When the VCC pin becomes higher than the threshold voltage (VCCDETH1 = 2.9V) again, this function is repeated.
 Charge mode (MPPT_ENA =H)
The detection that the VCC pin is equal to the threshold voltage (VCCDETH2 = 2.6V) or higher is the source to start the
DC/DC converter operation. It’s a factor turn on the internal switch between VCC and VOUT.
It has the hysteresis, and the detection that the VCC pin is equal to the threshold voltage (VCCDETL2 = 2.55V) or lower is
the source to stop the DC/DC converter operation. It’s a factor turn off the internal switch between VCC and VOUT.
When the VCC pin becomes higher than the threshold voltage (VCCDETH2 = 2.6V) again, this function is repeated.
VOUT Detection1, 2 (VOUT Detection Voltage1, 2)
This function works with both the constant voltage mode (MPPT_ENA =L) and the charge mode (MPPT_ENA =H).
 Constant voltage mode (MPPT_ENA =L)
The detection that the VOUT pin is equal to the threshold voltage (VOUTDETH1 = 2.9V), and it’s a factor to turn on the
internal switch between VCC and VOUT.
It has the hysteresis, and the detection that the VOUT pin is equal to the threshold voltage (VOUTDETL1 = 2.6V), and it’s a
factor to turn off the internal switch between VCC and VOUT.
When the VOUT pin becomes higher than the threshold voltage (VOUTDETH1 = 2.9V) again, this function is repeated.
 Charge mode (MPPT_ENA =H)
The detection that the VOUT pin is equal to the threshold voltage (VOUTDETH2 = 2.6V) or higher is the source to start the
DC/DC converter operation. It’s a factor turn on the internal switch between VCC and VOUT.
It has the hysteresis, and the detection that the VOUT pin is equal to the threshold voltage (VOUTDETL2 = 2.55V) or lower
is the source to stop the DC/DC converter operation. It’s a factor turn off the internal switch between VCC and VOUT.
When the VOUT pin becomes higher than the threshold voltage (VOUTDETH2 = 2.6V) again, this function is repeated.
Document Number: 002-08404 Rev *A
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