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OPA369 Datasheet(PDF) 10 Page - Texas Instruments

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Part # OPA369
Description  1.8V, 700nA, Zer첩-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER
PDF  19 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA369 Datasheet(HTML) 10 Page - Texas Instruments

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BATTERY MONITORING
R =R
1
F
=20MW
V
HYST
V
BATT
=420kW
50mV
2.4V
(2)
R =
2
-
V
THRS
V
1
REF
R
´
1
R
1
1
(
) - 1
R
F
=
-
2V
1.2V
420kW
´
1
420kW
1
(
)
-
1
20MW
= 650kW
(3)
R =
F
V
REF
1000(I
BMAX)
=
1.2V
1000(50pA)
= 24M
20M
W
W
»
(1)
R
=
BIAS
=0.3MW
(V
BATTMIN - V
)
REF
I
BIAS
=
(
1.2V)
-
1.8V
2 A
m
(4)
REF1112
OPA369
+IN
OUT
-
IN
V
STATUS
V
BATT
V
REF
R
1
R
2
R
BIAS
I
BIAS
R
F
+
OPA369
OPA2369
SBOS414B – AUGUST 2007 – REVISED DECEMBER 2008 ............................................................................................................................................ www.ti.com
The low operating voltage and quiescent current of
the OPA369 series make it an excellent choice for
4. Select a threshold voltage for VIN rising (VTHRS) =
battery
monitoring
applications,
as
shown
in
2.0V
Figure 25. In this circuit, VSTATUS is high as long as
5. Calculate R2 as follows:
the battery voltage remains above 2V. A low-power
reference is used to set the trip point. Resistor values
are selected as follows:
1. Selecting RF: Select RF such that the current
through RF is approximately 1000x larger than
the maximum bias current over temperature:
6. Calculate RBIAS: The minimum supply voltage for
this circuit is 1.8V. The REF1112 has a current
requirement
of
1.2
µA (max). Providing the
2. Choose
the
hysteresis
voltage,
VHYST. For
REF1112 with 2
µA of supply current assures
battery-monitoring
applications,
50mV
is
proper operation. Therefore:
adequate.
3. Calculate R1 as follows:
Figure 25. Battery Monitor
10
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Copyright © 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA369 OPA2369



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