LT1499(RevE) View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1499
(Rev.:RevE)
(Rev.:RevE)
Linear Technology
LT1499 Datasheet PDF : 20 Pages
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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
A1 forces a voltage equal to (IL)(RSENSE) across RA. This
voltage is then amplified at the Charge Out by the ratio of
RB over RA. In this mode, the output of A2 remains high,
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.
IL
CHARGE
RSENSE
0.1Ω
VBATTERY DISCHARGE
RA
RA
A2
1/2 LT1498
RA
RA
VBATTERY
+
A1
1/2 LT1498
–
Q2
Q1
MTP23P06 MTP23P06
DISCHARGE CHARGE
OUT
OUT
RB
RB
( ) VO = IL
RB
RA
RSENSE
FOR RA = 1k, RB = 10k
VO
IL
=
1V/A
14989 F03
Figure 3. Bidirectional Current Sensor
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PART NUMBER DESCRIPTION
COMMENTS
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20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
14989fe
LT 1009 REV E • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2009
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