LT1499 LINER [Linear Technology], LT1499 Datasheet - Page 16

• Manufacturer Part Number: LT1499
• Description: 10MHz, 6V/us, Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps
• Manufacturer: LINER [Linear Technology]

RELATED PARTS
LT1498/LT1499
TYPICAL
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
A1 forces a voltage equal to (I
PART NUMBER
LTC
LT1211/LT1212
LT1213/LT1214
LT1215/LT1216
LT1366/LT1367
LT1490/LT1491
16
®
1152
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 [phone]
FAX: [phone] TELEX: 499-3977 www.linear-tech.com
APPLICATION
Rail-to-Rail Input and Output, Zero-Drift Op Amp
Dual/Quad 14MHz, 7V/ s, Single Supply Precision Op Amps
Dual/Quad 28MHz, 12V/ s, Single Supply Precision Op Amps
Dual/Quad 23MHz, 50V/ s, Single Supply Precision Op Amps
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps
DESCRIPTON
L
)(R
U
SENSE
V
1/2 LT1498
BATTERY
A2
) across R
Figure 3. Bidirectional Current Sensor
+
–
DISCHARGE
CHARGE
R
Q2
MTP23P06
I
L
B
DISCHARGE
OUT
R
R
A
A
A
. This
R
0.1
SENSE
MTP23P06
CHARGE
voltage is then amplified 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
Q1
A
A
over R
COMMENTS
High DC Accuracy, 10 V V
1V/ s Slew Rate, Max Supply Current 2.2mA
Input Common Mode Includes Ground, 275 V V
6 V/ C Max Drift, Max Supply Current 1.8mA per Op Amp
Input Common Mode Includes Ground, 275 V V
6 V/ C Max Drift, Max Supply Current 3.5mA per Op Amp
Input Common Mode Includes Ground, 450 V V
Max Supply Current 6.6mA per Op Amp
475 V V
Max Supply Current 520 A per Op Amp
Max Supply Current 50 A per Op Amp, 200kHz GBW, 0.07V/ s
Slew Rate, Operates with Inputs 44V Above V
of V
R
B
+
+
1/2 LT1498
–
A
. In this mode, the output of A2 remains high,
OS(MAX)
V
FOR R
V
I
A1
L
O
O
= I
= 1V/A
L
A
R
R
= 1k, R
, 400kHz GBW, 0.13V/ s Slew Rate,
B
A
R
V
SENSE
BATTERY
B
1498/99 F03
= 10k
OS(MAX)
LINEAR TECHNOLOGY CORPORATION 1996
14989f LT/TP 0397 7K • PRINTED IN USA
, 100nV/ C Drift, 1MHz GBW,
–
Independent
OS(MAX)
OS(MAX)
OS(MAX)
,
,
,