LT1499CS Linear Technology, LT1499CS Datasheet - Page 24

• Manufacturer Part Number: LT1499CS
• Description: IC OP-AMP R-R IN/OUT QUAD 14SOIC
• Manufacturer: Linear Technology
• Series: C-Load™r

Specifications of LT1499CS

• 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: 0°C ~ 70°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: -

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
RELATED PARTS
PART NUMBER DESCRIPTION
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LT1213/LT1214 Dual/Quad 28MHz, 12V/μs, Single Supply Precision Op Amps
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LT1366/LT1367 Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
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24
®
1152
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
Rail-to-Rail Input and Output, Zero-Drift Op Amp
●
FAX: [phone]
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