LT1499CS datasheet(20/20 Pages) LINER

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LT1498/LT1499

14989fe

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

LT 1009 REV E • PRINTED IN USA

RELATED PARTS

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.

Figure 3. Bidirectional Current Sensor

–

1/2 LT1498

MTP23P06

VO = IL

= 1V/A

FOR RA = 1k, RB = 10k

RSENSE

DISCHARGE

OUT

CHARGE

OUT

MTP23P06

VBATTERY

14989 F03

DISCHARGE

CHARGE

RSENSE

0.1Ω

()

PART NUMBER

DESCRIPTION

COMMENTS

LTC®1152

Rail-to-Rail Input and Output, Zero-Drift Op Amp

High DC Accuracy, 10μV VOS(MAX), 100nV/°C Drift, 1MHz GBW, 1V/μs

Slew Rate, Max Supply Current 2.2mA

LT1211/LT1212

Dual/Quad 14MHz, 7V/μs, Single Supply Precision Op Amps

Input Common Mode Includes Ground, 275μV VOS(MAX), 6μV/°C Max

Drift, Max Supply Current 1.8mA per Op Amp

LT1213/LT1214

Dual/Quad 28MHz, 12V/μs, Single Supply Precision Op Amps

Input Common Mode Includes Ground, 275μV VOS(MAX), 6μV/°C Max

Drift, Max Supply Current 3.5mA per Op Amp

LT1215/LT1216

Dual/Quad 23MHz, 50V/μs, Single Supply Precision Op Amps

Input Common Mode Includes Ground, 450μV VOS(MAX), Max Supply

Current 6.6mA per Op Amp

LT1366/LT1367

Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps

475μV VOS(MAX), 400kHz GBW, 0.13V/μs Slew Rate, Max Supply

Current 520μA per Op Amp

LT1490/LT1491

Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps

Max Supply Current 50μA per Op Amp, 200kHz GBW, 0.07V/μs Slew

Rate, Operates with Inputs 44V Above V– Independent of V+

LT1884/LT1885

Dual/Quad, Rail-to-Rail Output Picoamp Input Precision Op Amps ICC = 650μA, VOS < 50μV, IB < 400pA

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