MB39C831-EVB-02 Thermal Energy Harvesting Evaluation Board Operation Guide, Doc. No. 002-08635 Rev. *A
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8. Application Notes
8.1
Harvester
The MB39C831 is designed for a harvester having a high power generation capacity, such as an outdoor solar
cell. It is not possible to start up with a small indoor solar cell.
8.2
Power Requirement in Start-Up in Constant Voltage Mode
The VDD (VDD=0.35V) voltage is applied from constant voltage source.
Table 8-1. Power Requirement in Start-Up
Preset Output Voltage
Setting [V]
Average Voltage
in Start-Up at VDD [V]
Current Requirement
in Start-Up at VDD [mA]
Power Requirement
in Start-Upat VDD [mW]
3.0
0.35
17.7
6.20
3.3
0.35
18.8
6.58
3.6
0.35
22.7
7.95
4.1
0.35
33.1
11.59
4.5
0.35
46.3
16.21
5.0
0.35
73.6
25.76
VDD voltage is applied from constant voltage source.
Figure 8-1. Current and Power Requirements in Start-Up
VDD = 0.35V (average)
Current Requirent in Start-up
vs Preset Output Voltages
Preset Output Voltages [V]
3.0
3.3
3.6
4.1
4.5
5.0
C
u
rr
e
n
t
R
e
q
u
ir
e
n
t
in
S
ta
rt
-u
p
a
t
V
D
D
[
m
A
]
0
20
100
10
30
40
50
60
70
80
90
VDD = 0.35V (average)
Power Requirent in Start-up
vs Preset Output Voltages
Preset Output Voltages [V]
3.0
3.3
3.6
4.1
4.5
5.0
P
o
w
e
r
R
e
q
u
ir
e
n
t
in
S
ta
rt
-u
p
a
t
V
D
D
[
m
W
]
0
5
30
10
15
20
25
VDD voltage is applied from constant voltage source
.
