MB39C831 Datasheet, PDF (16/40 Pages) Cypress Semiconductor – Ultra Low Voltage Boost Power Management IC for Solar/Thermal Energy Harvesting Datasheet

MB39C831
VOUT Detection3 (VOUT Detection Voltage3)
This function works with the charge mode (MPPT_ENA =H).
When the VOUT pin becomes higher than the threshold voltage (VOUTDETH3 = 4V), the DC/DC converter stops the
operation.
It has the hysteresis, and when the VOUT pin becomes lower than the threshold voltage (VOUTDETL3 =3.7V), the DC/DC
converter restarts the operation.
UVLO
This function works with the charge mode (MPPT_ENA =H).
In the state the DC/DC converter starts and during the charge operation, when the VDD pin becomes lower than the lower
threshold voltage (VUVLOL = 0.2V), UVLO function works and the DC/DC converter stops the operation.
Then when the VDD pin becomes higher than the upper threshold voltage (VUVLOH = 0.3V), the DC/DC converter starts the
operation again.
After that, this function is repeated.
VOUT-VDD Voltage Reverse Monitoring
This function works with the charge mode (MPPT_ENA =H).
The detection that the VDD pin is equal to the VOUT pin's voltage or higher is the source to stop the DC/DC control part
operation.
Output Current Protection
It has the current limitation function to protect the circuit during the over load current. When the input current for the LX pin
reaches LX peak current (ILIMIN_A), the output voltage drops in order to prevent the IC destruction.
State Notification
This function is independent of the MPPT_ENA setting.
The VCC voltage stage, the VOUT voltage state, and the VOUT-VDD voltage reverse state are notified by the DET[1:0]
signals.
The state notification is not a power good function.
Table 7-4 Stage Notification of Constant Voltage Mode (MPPT_ENA = L, ENA = H)
Output Signal
DET1 Pin DET0 Pin
L
L
L
H
State
Constant Voltage Mode (MPPT_ENA = L, ENA = H)
VCC terminal ≤ VCC detection voltage 1 and VOUT terminal ≤ VOUT detection voltage 1
VCC terminal ≥ VCC detection voltage 1 and VOUT terminal ≤ VOUT detection voltage 1
H
L
Constant voltage operation:
VCC terminal ≥ VCC detection voltage 1 and VOUT terminal ≥ VOUT detection voltage 1
H
H
VCC terminal ≤ VCC detection voltage 1 and VOUT terminal ≥ VOUT detection voltage 1
Document Number: 002-08404 Rev *A
Page 16 of 40