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MAX6458UKD0C-T Datasheet(PDF) 11 Page - Maxim Integrated Products

Part # MAX6458UKD0C-T
Description  High-Voltage, Low-Current Voltage Monitors in SOT Packages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6458UKD0C-T Datasheet(HTML) 11 Page - Maxim Integrated Products

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remains high. When VCC exceeds VTRIPHIGH, OUTB
asserts low while OUTA remains high. VTRIPLOW and
VTRIPHIGH are given by the following equations:
where RTOTAL = R1 + R2 + R3.
Use the following steps to determine the values for R1,
R2, and R3.
1) Choose a value for RTOTAL, the sum of R1, R2, and
R3. Because the MAX6458/MAX6459 have very
high input impedance, RTOTAL can be up to 5MΩ.
2) Calculate R3 based on RTOTAL and the desired
upper trip point:
3) Calculate R2 based on RTOTAL, R3, and the desired
lower trip point:
4) Calculate R1 based on RTOTAL, R3, and R2:
R1 = RTOTAL - R2 - R3
Example Calculations for Window
Detection
The following is an example for calculating R1, R2, and
R3 of Figure 11 for window detection. Select the upper
and lower trip points (VTRIPHIGH and VTRIPLOW).
VCC = 21V
VTRIPHIGH = 23.1V
VTRIPLOW = 18.9V
For 5% hysteresis, VTH+ = 1.228 and VTH- = 1.167.
1) Choose RTOTAL = 4.2MΩ = R1 + R2 + R3
2) Calculate R3
3) Calculate R2
R
VR
V
VM
V
k
TH
TOTAL
TRIPHIGH
3
1 228
4 2
23 1
223 273
=
×
=
=Ω
+
(.
) ( .
)
.
.
R
VR
V
R
TH
TOTAL
TRIPLOW
23
=
×
-
-
R
VR
V
TH
TOTAL
TRIPHIGH
3
=
×
+
VV
R
RR
VV
R
R
TRIPLOW
TH
TOTAL
TRIPHIGH
TH
TOTAL
=
+
⎝⎜
⎠⎟
=
⎝⎜
⎠⎟
+
-
23
3
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
11
MAX6457–
MAX6460
VMON
VCC
VCC
R1
R2
GND
RPULLUP
IN+
OUT
(OUTA FOR
MAX6459)
OUT
(OUTA)
Figure 12. Monitoring Voltages Other than VCC
MAX6457–
MAX6460
VCC
GND
RPULLUP
OUT/
OUTA/
OUTB
OUT/
OUTA/
OUTB
VCC (4V TO 28V)
VOUT (UP TO 28V)
Figure 13. Interfacing to Voltages Other than VCC
MAX6460
VCC
VCC
R1
R2
GND
VNEG
RPULLUP
IN+
REF
IN-
OUT
OUT
Figure 14. Monitoring Negative Voltages


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