OPA2369AIDCNT datasheet(10/20 Pages) TI

Part #	OPA2369AIDCNT

Description	1.8V, 700nA, Zer첩-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER

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Manufacturer	TI [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

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

»

(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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Product Folder Link(s): OPA369 OPA2369

Similar Part No. - OPA2369AIDCNT

Manufacturer	Part #	Datasheet	Description
Burr-Brown (TI)	OPA2369AIDCNT	665Kb / 20P	1.8V, 1關A max, Zer첩-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER
Texas Instruments	OPA2369AIDCNT	820Kb / 19P	[Old version datasheet] 1.8V, 700nA, Zer첩-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER
Burr-Brown (TI)	OPA2369AIDCNTG4	665Kb / 20P	1.8V, 1關A max, Zer첩-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER
Texas Instruments	OPA2369AIDCNTG4	820Kb / 19P	[Old version datasheet] 1.8V, 700nA, Zer첩-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER

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Similar Description - OPA2369AIDCNT

Manufacturer	Part #	Datasheet	Description
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OPA2369AIDCNT Datasheet(PDF) 10 Page - Texas Instruments

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