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MAX983CSA Datasheet

  • MAX983CSA

  • Maxim Integrated Products [Ultra-Low-Power, Open-Drain, Sin...

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  • MAXIM

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Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
2) Select R1. The leakage current into INB- is normally
under 1nA, so the current through R1 should exceed
100nA for the thresholds to be accurate. R1 values
up to about 10M鈩?can be used, but values in the
100k鈩?to 1M鈩?range are usually easier to deal with.
In this example, choose R1 = 294k鈩?
3) Calculate R2 + R3. The overvoltage threshold
should be 5.5V when V
IN
is rising. The design
equation is as follows:
铮?/div>
铮?/div>
V
OTH
R2
+
R3
=
R1
脳 铮?/div>
鈭?/div>
1
铮?/div>
铮?/div>
V
REF
+
V
H
铮?/div>
铮?/div>
铮?/div>
5.5
=
294k
脳 铮?/div>
鈭?/div>
1
铮?/div>
铮?/div>
(1.182
+
0.005)
铮?/div>
=
1.068M
鈩?/div>
4) Calculate R2. The undervoltage threshold should be
4.5V when V
IN
is falling. The design equation is as
follows:
(V
REF
鈭?/div>
V
H
)
R2
=
(R1 + R2 + R3)
脳
鈭?/div>
R1
V
UTH
=
(294k + 1.068M)
脳
(1.182
鈭?/div>
0.005)
鈭?/div>
294k
4.5
R1
294k
MAX971鈥揗AX974/MAX981鈥揗AX984
V
IN
R3
1M
V
OTH
= 5.5V
V
UTH
= 4.5V
+5V
7
V+
OUTA 1
3 INA+
1M
5 HYST
R2
62.2k
R5
10k
R4
2.4M
6 REF
OUTB 8
4 INB-
V-
2
POWER GOOD
MAX9_3
=
62.2k
鈩?/div>
Choose R2
=
61.9k
鈩?/div>
(1% standard value).
5) Calculate R3:
R3
=
(R2 + R3)
鈭?/div>
R2
=
1.068M
鈭?/div>
61.9k
=
1.006M
鈩?/div>
Choose R3 = 1M鈩?(1% standard value)
6) Verify the resistor values. The equations are as
follows, evaluated for the above example:
Overvoltage Threshold :
(R1
+
R2
+
R3)
V
OTH
=
(V
REF
+
V
H
)
脳
R1
=
5.474V
Undervoltage Threshold :
(R1
+
R2
+
R3)
V
UTH
=
(V
REF
鈭?/div>
V
H
)
脳
(R1 + R2)
=
4.484V
where the hysteresis voltage V
H
=
V
REF
脳
R5
.
R4
Figure 5. Window Detector
Battery Switchover Circuit
The switchover from line-powered DC to a backup
battery is often accomplished with diodes. But this
simple method is sometimes unacceptable, due to the
voltage drop and associated power loss across the
diode in series with the battery. Figure 6鈥檚 circuit
replaces the diode with a P-channel MOSFET
controlled by one of the MAX9_3 comparator outputs.
When the DC wall adapter drops below 4V (determined
by R1 and R2), OUTA goes low, turning on Q1.
Comparator B is used to measure the battery voltage,
and gives a 鈥渓ow-battery鈥?indication when the battery
drops below 3.6V.
Level Shifter
Figure 7 shows a circuit to shift from bipolar 卤5V inputs
to single-ended +5V outputs. The 10k鈩?resistors
protect the comparator inputs, and do not materially
affect the circuit鈥檚 operation.
______________________________________________________________________________________
11

MAX983CSA 产品属性

  • Maxim Integrated Products

  • Tube

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