LT1499IS#TR Linear Technology, LT1499IS#TR Datasheet - Page 24
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LT1499IS#TR
Manufacturer Part Number
LT1499IS#TR
Description
IC OP-AMP R-R IN/OUT QUAD 14SOIC
Manufacturer
Linear Technology
Series
C-Load™r
Datasheet
1.LT1498CN8PBF.pdf
(24 pages)
Specifications of LT1499IS#TR
Amplifier Type
General Purpose
Number Of Circuits
4
Output Type
Rail-to-Rail
Slew Rate
6 V/µs
Gain Bandwidth Product
10.5MHz
Current - Input Bias
250nA
Voltage - Input Offset
200µV
Current - Supply
1.8mA
Current - Output / Channel
30mA
Voltage - Supply, Single/dual (±)
2.2 V ~ 36 V, ±1.1 V ~ 18 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
-3db Bandwidth
-
Other names
LT1499ISTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
LT1498/LT1499
TYPICAL APPLICATION
Bidirectional Current Sensor
A bidirectional current sensor for battery-powered sys-
tems is shown in Figure 3. Two outputs are provided: one
proportional to charge current, the other proportional
to discharge current. The circuit takes advantage of the
LT1498’s rail-to-rail input range and its output phase
reversal protection. During the charge cycle, the op amp
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24
®
1152
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
Rail-to-Rail Input and Output, Zero-Drift Op Amp
●
FAX: (408) 434-0507
V
1/2 LT1498
BATTERY
●
www.linear.com
A2
Figure 3. Bidirectional Current Sensor
+
–
DISCHARGE
CHARGE
R
Q2
MTP23P06
I
L
B
R
R
DISCHARGE
OUT
A
A
R
0.1Ω
SENSE
MTP23P06
CHARGE
A1 forces a voltage equal to (I
voltage is then amplifi ed at the Charge Out by the ratio of
R
keeping Q2 off and the Discharge Out low, even though
the (+) input of A2 exceeds the positive power supply.
During the discharge cycle, A2 and Q2 are active and the
operation is similar to the charge cycle.
OUT
B
R
R
A
A
Q1
COMMENTS
High DC Accuracy, 10μV V
Slew Rate, Max Supply Current 2.2mA
Input Common Mode Includes Ground, 275μV V
Drift, Max Supply Current 1.8mA per Op Amp
Input Common Mode Includes Ground, 275μV V
Drift, Max Supply Current 3.5mA per Op Amp
Input Common Mode Includes Ground, 450μV V
Current 6.6mA per Op Amp
475μV V
Current 520μA per Op Amp
Max Supply Current 50μA per Op Amp, 200kHz GBW, 0.07V/μs Slew
Rate, Operates with Inputs 44V Above V
over R
CC
= 650μA, V
R
B
OS(MAX)
+
–
1/2 LT1498
A
. In this mode, the output of A2 remains high,
V
FOR R
V
I
A1
L
O
O
= I
= 1V/A
OS
, 400kHz GBW, 0.13V/μs Slew Rate, Max Supply
L
A
( )
< 50μV, I
R
R
= 1k, R
B
A
R
V
SENSE
BATTERY
B
14989 F03
= 10k
OS(MAX)
B
< 400pA
© LINEAR TECHNOLOGY CORPORATION 2009
, 100nV/°C Drift, 1MHz GBW, 1V/μs
L
)(R
–
SENSE
Independent of V
LT 0410 REV G • PRINTED IN USA
OS(MAX)
OS(MAX)
OS(MAX)
) across R
, 6μV/°C Max
, 6μV/°C Max
, Max Supply
+
A
. This
14989fg