MB39C811 Datasheet, PDF (12/36 Pages) Cypress Semiconductor – Ultra Low Power Buck PMIC Solar/Vibrations Energy Harvesting

MB39C811
Input/output power-good signal output
When the VIN pin input voltage is equal to the release voltage VUVLOH for UVLO or more, the output for the
IPGOOD pin is set to the “H” level as the input power-good. When the VIN pin input voltage is equal to the detection
voltage VUVLOL for UVLO or less, the output for the IPGOOD pin is reset to the “L” level. The IPGOOD output is
enabled only when the following output power-good signal output OPGOOD is “H” level.
The output power-good signal OPGOOD is set to the “H” level when the feedback voltage VFB for the VOUT pin is
equal to the detection voltage VOPGH or more. When the feedback voltage VFB is equal to the reset voltage VOPGL
or less, the output for the OPGOOD pin is reset to the “L” level.
Table 8. Input Power-Good Signal Output (IPGOOD)
OPGOOD
L
UVLO
Don’t care
H
L
H
H
IPGOOD
L
L
H
Table 9. Output Power-Good Signal Output (OPGOOD)
VFB
≤ VOPGL
OPGOOD
L
≥ VOPGH
(VVOUT ≥ 3.3V) ^[1]
H
[1]:Please contact the department in charge if use this output power-good function under the conditions of
VVOUT≤2.5V.
Figure 6. Input/Output Power-Good Signal Output
Logic
High
Logic
Low
VOPGL
VOUT
VOPGH
Input Over Voltage Protection
If the voltage exceeding VSHUNT (Typ : 21V) is input to the VIN pin, the input level is clamped enabling the over
voltage protection circuit. The flowing current is ISHUNT (Min 100mA) during clamp.
Over Current Protection
If the output current for the LX pin reaches the over current detection level IPEAK, the circuit is protected by
controlling the peak value for the inductor current setting the main side FET to the OFF state.
Document Number: 002-08401 Rev *A
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