MAX6457 Maxim, MAX6457 Datasheet - Page 13

• Manufacturer Part Number: MAX6457
• Description: High-Voltage / Low-Current Voltage Monitors in SOT Packages
• Manufacturer: Maxim

4) Calculate R1
The MAX6457–MAX6460 can monitor voltages other than
V
Programming the Trip Voltage section. The monitored volt-
age (V
the specified operating range: 0 to V
CC
High-Voltage, Low-Current Voltage Monitors in
(Figure 12). Calculate V
R
MON
2
R
=
=
1
Monitoring Voltages Other than V
=
) is independent of V
36 06
=
=
=
V
( .
1 167
TH
.
R
4 2
3 94067
V
-
.
TRIPLOW
TOTAL
.
×
18 9
k
M
______________________________________________________________________________________
V
Ω
R
Ω
) ( .
.
TOTAL
4 2
V
-
-
M
TOP VIEW
223 273
R
Ω
M
2
Ω
.
-
)
-
R
R
-
3
OUTA
3
GND
GND
223 273
k
OUT
CC
IN+
IN+
Ω
TRIP
. V
CC
.
-
1
2
3
1
2
3
36 06
IN
.
as shown in the
+ must be within
k
.
MAX6457
MAX6459
SOT23
SOT23
Ω
k
Ω
4
4
5
6
5
CC
V
CLEAR
V
OUTB
IN-
CC
CC
The open-drain outputs of the MAX6457–MAX6460
allow the output voltage to be selected independent of
V
V
OUTB and any desired voltage up to 28V (see Figure 13).
Figure 14 shows the typical application circuit for moni-
toring negative voltages (V
Select a value for R1 between 25kΩ and 1MΩ. Use the
following equation to select R2:
where V
be within the specified operating range: 0 to V
TRANSISTOR COUNT: 785
PROCESS: BiCMOS
CC
CC
GND
GND
OUT
OUT
IN+
IN+
. For systems requiring an output voltage other than
, connect the pullup resistor between OUT, OUTA, or
Interfacing to Voltages Other than V
1
2
3
1
2
3
REF
MAX6458
MAX6460
SOT23
SOT23
= 2.25V and V
R
Monitoring Negative Voltages
2
=
SOT Packages
5
4
6
5
4
R
1
V
IN-
V
REF
IN-
CC
CC
×
Pin Configurations
NEG
NEG
-
Chip Information
V
V
REF
NEG
< 0. V
) using the MAX6460.
IN
+ must always
CC
.
CC
13