MB39C811 Datasheet, PDF (11/36 Pages) Cypress Semiconductor – Ultra Low Power Buck PMIC Solar/Vibrations Energy Harvesting

MB39C811
7.2 Start-Up/Shut-Down Sequences
Figure 5. Timing Chart
AC1_1,
AC1_2
or
AC2_1,
AC2_2
Charge
Voltage
VIN
VVB
VSHUNT
Internal
Regulator
VB
Start-up
UVLO
UVLO
Rising
(internal signal)
LX
UVLO
Falling
DC/DC
Enable
VOUT
Transfer Charge
to the Output
IPGOOD
OPGOOD
Output
OPGOOD
VVB
sleep
Output
IPGOOD
VUVLOH
VUVLOL
UVLO
Falling
active
VOPGH
VOPGL
Rest
IPGOOD
Reset
OPGOOD
7.3 Function Descriptions
Output Voltage Setting and Under Voltage Lockout Protection (UVLO) Function
It is possible to select the output voltage from eight kinds of presets using the S2, S1 and S0 pins.
Also, the under voltage lockout protection circuit is provided to prevent IC's malfunction by the transient state or the
instant drop during the VIN pin voltage activation, system destroy and deterioration, and it is set as follows according
to the preset voltage. When the VIN pin exceeds the release voltage for the UVLO circuit, the system is recovered.
Table 7. Output Voltage Setting and Under Voltage Lockout Protection (UVLO) Function
Under voltage lockout protection (UVLO) -Typ-
S2
S1
S0
VOUT[V]
Detection voltage
Release voltage
(Falling) VUVLOL [V]
(Rising) VUVLOH [V]
L
L
L
1.5
L
L
H
1.8
2.8
4.0
L
H
L
2.5
L
H
H
3.3
4.0
5.2
H
L
L
3.6
H
L
H
4.1
H
H
L
4.5
6.0
7.2
H
H
H
5.0
Document Number: 002-08401 Rev *A
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