LT6100CDD#TR_技术文档

LT6100

Precision, Gain Selectable

High Side Current Sense

Amplifier

FeaTures

DescripTion

The LT^®6100 is a complete micropower, precision, high

side current sense amplifier. The LT6100 monitors unidi-

rectional currents via the voltage across an external sense

resistor. Fixed gains of 10, 12.5, 20, 25, 40, 50V/V are

obtained by simply strapping or floating two gain select

pins. Gain accuracy is better than 0.5% for all gains.

n

Input Offset Voltage: 300µV (Max)

n

Sense Inputs Up to 48V

n

0.5% Gain Accuracy

Pin Selectable Gain: 10, 12.5, 20, 25, 40, 50V/V

Separate Power Supply: 2.7V to 36V

Operating Current: 60µA

Sense Input Current (V Powered Down): 1nA

Reverse Battery Protected to –48V

Buffered Output

n

CC

TheLT6100senseinputshaveavoltagerangethatextends

from 4.1V to 48V, and can withstand a differential voltage

of the full supply. This makes it possible to monitor the

voltage across a MOSFET switch or a fuse. The part can

also withstand a reverse battery condition on the inputs.

n

Noise Filtering Input

–40°C to 125°C Operating Temperature Range

Available in 8-Lead DFN and MSOP Packages

Input offset is a low 300µV. CMRR and PSRR are in ex-

cess of 105dB, resulting in a wide dynamic range. A filter

pin is provided to easily implement signal filtering with a

single capacitor.

applicaTions

n

Battery Monitoring

n

Fuse Monitoring

The LT6100 has a separate supply input, which operates

n

Portable and Cellular Phones

Portable Test/Measurement Systems

from 2.7V to 36V and draws only 60µA. When V is

CC

n

powered down, the sense pins are biased off. This pre-

vents loading of the monitored circuit, irrespective of the

sense voltage. The LT6100 is available in an 8-lead DFN

and MSOP package.

L, LT, LTC, LTM, Linear Technology, the Linear logo and Over-The-Top are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

Typical applicaTion

0A to 33A High Side Current Monitor with 12kHz Frequency Rolloff

Input Offset Voltage

vs V_SSense Input Voltage

1.5

4.4V TO 48V

SUPPLY

3V

V

= 100mV

SENSE

2

7

6

= 3V

CC

A

1.0

T

= 25°C

V

A4

A2

LT6100

+

CC

0.5

0

V

S

8

1

V

OUT

5

R

V

= 2.5V

OUT

SENSE

3mΩ

I

= 33A

SENSE

–

V

S

–0.5

–1.0

–1.5

V

4

EE

FIL

3

LOAD

6100 TA01a

220pF

CONFIGURED FOR GAIN = 25V/V

0

5

10 15 20 25 30 35 40 45 50

V

SENSE INPUT VOLTAGE (V)

S

6100 TA01b

6100fc

1

LT6100

absoluTe MaxiMuM raTings ^{(Notes 1, 2)}

Differential Sense Voltage...................................... 48V

Specified Temperature Range (Note 5)

+

–

Total V , V to V ............................................... 48V

LT6100C ............................................–40°C to 85°C

LT6100I ..............................................–40°C to 85°C

LT6100H .......................................... –40°C to 125°C

Storage Temperature Range ...........................................

DFN.................................................... –65°C to 125°C

MSOP ................................................ –65°C to 150°C

Lead Temperature (Soldering, 10 sec)

S

EE

Total V Supply Voltage from V ......................... 36V

CC

EE

Output Voltage ............................... (V ) to (V + 36V)

EE

Output Short-Circuit Duration (Note 3) ........ Continuous

Operating Temperature Range (Note 4)

LT6100C ............................................–40°C to 85°C

LT6100I ..............................................–40°C to 85°C

LT6100H .......................................... –40°C to 125°C

MSOP .............................................................. 300°C

package/orDer inForMaTion

TOP VIEW

–

+

V

1

2

3

4

8

7

6

5

V

S

–

+

V

1

2

3

4

8 V

S

V

A4

A2

V

CC

7 A4

6 A2

5 V

9

CC

FIL

EE

FIL

V

OUT

V

EE

OUT

MS8 PACKAGE

8-LEAD PLASTIC MSOP

DD PACKAGE

8-LEAD (3mm × 3mm) PLASTIC DFN

T

= 150°C, θ = 250°C/W

JA

JMAX

T

= 125°C, θ = 43°C/W

JA

JMAX

EXPOSED PAD (PIN 9) IS V , MUST BE SOLDERED TO PCB

EE

Order part number

dd part marking*

Order part number

mS part marking*

Lt6110Cdd

Lt6110idd

Lt6100hdd

Lbmw

Lt6100CmS8

Lt6100imS8

Lt6100hmS8

Ltbmv

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grades are identified by a label on the shipping

container.

elecTrical characTerisTics

The l denotes specifications which apply over the temperature range 0°C ≤ T_A≤ 70°C (LT6100C), otherwise specifications are

T_A= 25°C. V_CC= 5V, V_EE= 0V, V_S⁺= V_CC+ 1.4V unless otherwise specified. (Note 5)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

–

+

l

V

, V

Sense Amplifier Supply Voltage

Input Sense Voltage Full Scale

V

= 2.7V

4.1

48

V

S

CC

+

–

l

V

SENSE

V

SENSE

= V – V , V = 3V, A = 10V/V

= V – V , V = 5V, A = 10V/V

110

300

mV

SENSE

S

CC

V

Input Offset Voltage (MS Package)

Input Offset Voltage (DD Package)

I

= 0

–300

–500

80

300

500

µV

OS

OUT

l

I

= 0

–350

–550

350

550

µV

OUT

l

V

TC

Temperature Coefficient of V

(Note 6)

0.5

3

µV/°C

OS

6100fc

2

LT6100

elecTrical characTerisTics

The l denotes specifications which apply over the temperature range 0°C ≤ T_A≤ 70°C (LT6100C), otherwise specifications are

T_A= 25°C. V_CC= 5V, V_EE= 0V, V_S⁺= V_CC+ 1.4V unless otherwise specified. (Note 5)

SYMBOL

PARAMETER

Gain, V /V

CONDITIONS

MIN

TYP

MAX

UNITS

A

V

= 50mV to 80mV, A = 10V/V

SENSE V

OUT SENSE

LT6100MS8

LT6100DD8

9.95

9.94

9.90

10.05

10.06

10.10

V/V

l

V = 48V, V

= 50mV to 80mV, A = 10V/V

9.90

10.10

V/V

S

SENSE

V

Output Voltage Gain Error (Note 7)

V

= 50mV to 80mV,

SENSE

V

A = 10, 12.5, 20, 25, 40, 50V/V

LT6100MS8

LT6100DD8

–0.5

–0.6

–1.0

0.5

0.6

1.0

%

l

V = 48V, V

V

= 50mV to 80mV,

–1.0

1.0

%

S

SENSE

A = 10, 12.5, 20, 25, 40, 50V/V

V CMRR

V Sense Input Common Mode

V

= 50mV, V = 2.7V, V = 4.1V to 36V

105

100

120

dB

S

SENSE

CC

S

l

Rejection Ratio

V

CC

PSRR

V

CC

Supply Rejection Ratio

V

= 50mV, V = 36V, V = 3V to 30V

105

100

120

dB

S

CC

l

V

CC

Supply Voltage V

Bandwidth

2.7

36

V

CC

BW

A = 10V/V, f = –3dB, V = 15V

100

20

150

50

kHz

V

O

CC

A = 50V/V, f = –3dB, V = 15V

V

O

CC

t

I

Output Settling to 1% Final Value

Sense Input Current

V

= 10mV to 100mV

15

4.5

60

µs

µA

S

SENSE

+

–

l

, I

= 0V

10

S (O) S (O)

CC(O)

V

Supply Current

130

CC

SR

Slew Rate (Note 8)

= 15V, V

= 26mV to 380mV, A = 50V/V

0.03

0.02

0.05

V/µs

CC

SENSE

V

l

+

–

I

Short-Circuit Current

I

, I

8

15

60

mA

V

SC

SC SC

S(TOTAL)

l

Reverse V Supply

= –200µA, V = Open

50

S

CC

V

Minimum Output Voltage

V

= 0V, No Load

= V – V = –100mV, A = 50V/V, No Load

15

30

25

mV

O(MIN)

SENSE

+

–

S

V

l

Output High (Referred to V

)

CC

A = 50V/V, V

= 100mV, I = 0

75

85

125

175

125

150

250

400

mV

O(MAX)

V

SENSE

L

V

= 100mV, I = 100µA

SENSE

L

= 100mV, I = 500µA

= 100mV, I = 1mA

+

–

l

I

S

, I (Off) Sense Input Current (Power Down)

V

CC

= 0V, V = 48V, V = 0V

SENSE

0.001

1

µA

S

The l denotes specifications which apply over the temperature range –40°C ≤ T_A≤ 85°C (LT6100I), otherwise specifications are

T_A= 25°C. V_CC= 5V, V_EE= 0V, V_S⁺= V_CC+ 1.4V unless otherwise specified. (Note 5)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

–

+

l

V

, V

Sense Amplifier Supply Voltage

Input Sense Voltage Full Scale

V

= 2.7V

4.1

48

V

S

CC

+

–

l

V

SENSE

V

SENSE

= V – V , V = 3V, A = 10V/V

= V – V , V = 5V, A = 10V/V

110

300

mV

SENSE

S

CC

V

Input Offset Voltage (MS Package)

Input Offset Voltage (DD Package)

I

= 0

–300

–550

80

300

550

µV

OS

OUT

l

I

= 0

–350

–600

350

600

µV

OUT

l

V

TC

Temperature Coefficient of V

(Note 6)

0.5

3

µV/°C

OS

6100fc

3

LT6100

elecTrical characTerisTics

The l denotes specifications which apply over the temperature range –40°C ≤ T_A≤ 85°C (LT6100I), otherwise specifications are

T_A= 25°C. V_CC= 5V, V_EE= 0V, V_S⁺= V_CC+ 1.4V unless otherwise specified. (Note 5)

SYMBOL

PARAMETER

Gain, V /V

CONDITIONS

MIN

TYP

MAX

UNITS

A

V

= 50mV to 80mV, A = 10V/V

SENSE V

V

OUT SENSE

LT6100MS8

LT6100DD8

9.95

9.94

9.90

10.05

10.06

10.10

V/V

l

V = 48V, V

= 50mV to 80mV, A = 10V/V

9.90

10.10

V/V

S

SENSE

V

Output Voltage Gain Error (Note 7)

V

= 50mV to 80mV,

SENSE

A = 10, 12.5, 20, 25, 40, 50V/V

LT6100MS8

LT6100DD8

–0.5

–0.6

–1.0

0.5

0.6

1.0

%

l

V = 48V, V

V

= 50mV to 80mV,

–1.0

1.0

%

S

SENSE

A = 10, 12.5, 20, 25, 40, 50V/V

V CMRR

V Sense Input Common Mode

V

= 50mV, V = 2.7V, V = 4.1V to 36V

105

100

120

dB

S

SENSE

CC

S

l

Rejection Ratio

V

PSRR

V

CC

Supply Rejection Ratio

V

= 50mV, V = 36V, V = 3V to 30V

105

100

120

dB

CC

S

CC

l

Supply Voltage V

Bandwidth

2.7

36

V

CC

BW

A = 10V/V, f = –3dB, V = 15V

100

20

150

50

kHz

V

O

CC

A = 50V/V, f = –3dB, V = 15V

V

O

CC

t

I

Output Settling to 1% Final Value

Sense Input Current

Supply Current

V

= 10mV to 100mV

15

4.5

60

µs

µA

S

SENSE

+

–

l

, I

= 0V

10

S (O) S (O)

CC(O)

145

SR

Slew Rate (Note 8)

= 15V, V

= 26mV to 380mV, A = 50V/V

0.03

0.02

0.05

V/µs

CC

SENSE

V

l

+

–

I

Short-Circuit Current

I

, I

8

15

60

mA

V

SC

SC SC

S(TOTAL)

l

Reverse V Supply

= –200µA, V = Open

50

S

CC

V

Minimum Output Voltage

V

= 0V, No Load

= V – V = –100mV, A = 50V/V, No

15

30

25

mV

O(MIN)

O(MAX)

SENSE

Load

+

–

S

V

l

V

Output High (Referred to V

)

A = 50V/V, V

= 100mV, I = 0

75

85

125

175

125

150

250

400

mV

CC

V

SENSE

L

V

= 100mV, I = 100µA

SENSE

L

= 100mV, I = 500µA

= 100mV, I = 1mA

+

–

l

I

S

, I (Off) Sense Input Current (Power Down)

V

CC

= 0V, V = 48V, V = 0V

SENSE

0.001

1

µA

S

The l denotes specifications which apply over the temperature range –40°C ≤ T_A≤ 125°C (LT6100H), otherwise specifications are

T_A= 25°C. V_CC= 5V, V_EE= 0V, V_S⁺= V_CC+ 1.4V unless otherwise specified. (Note 5)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

–

+

l

V

, V

Sense Amplifier Supply Voltage

Input Sense Voltage Full Scale

V

= 2.7V

4.1

48

V

S

CC

+

–

l

V

= V – V , V = 3V, A = 10V/V

110

300

mV

SENSE

S

CC

V

= V – V , V = 5V, AV = 10V/V

V

Input Offset Voltage (MS Package)

Input Offset Voltage (DD Package)

I

= 0

–300

–600

80

300

600

µV

OS

OUT

l

I

= 0

–350

–650

350

650

µV

OUT

l

V

OS

TC

Temperature Coefficient of V

(Note 6)

0.5

5

µV/°C

OS

6100fc

4

LT6100

elecTrical characTerisTics

The l denotes specifications which apply over the temperature range –40°C ≤ T_A≤ 125°C (LT6100H), otherwise specifications are

T_A= 25°C. V_CC= 5V, V_EE= 0V, V_S⁺= V_CC+ 1.4V unless otherwise specified. (Note 5)

SYMBOL

PARAMETER

Gain, V /V

CONDITIONS

MIN

TYP

MAX

UNITS

A

V

= 50mV to 80mV, A = 10V/V

SENSE V

V

OUT SENSE

LT6100MS8

LT6100DD8

9.95

9.94

9.90

10.05

10.06

10.10

V/V

l

V = 48V, V

= 50mV to 80mV, A = 10V/V

9.90

10.10

V/V

S

SENSE

V

Output Voltage Gain Error (Note 7)

V

= 50mV to 80mV,

SENSE

AV = 10, 12.5, 20, 25, 40, 50V/V

LT6100MS8

–0.5

–0.6

–1.0

0.5

0.6

1.0

%

LT6100DD8

l

V = 48V, V

V

= 50mV to 80mV,

–1.0

1.0

%

S

SENSE

A = 10, 12.5, 20, 25, 40, 50V/V

V CMRR

V Sense Input Common Mode

V

= 50mV, V = 2.7V, V = 4.1V to 36V

105

100

120

dB

S

SENSE

CC

S

l

Rejection Ratio

V

CC

PSRR

V

CC

Supply Rejection Ratio

V

= 50mV, V = 36V, V = 3V to 30V

105

95

120

dB

S

CC

l

V

CC

Supply Voltage V

Bandwidth

2.7

36

V

CC

BW

A = 10V/V, f = –3dB, V = 15V

A = 50V/V, f = –3dB, V = 15V

100

20

150

50

kHz

V

O

CC

O

CC

t

I

Output Settling to 1% Final Value

Sense Input Current

Supply Current

V

= 10mV to 100mV

15

4.5

60

µs

µA

S

SENSE

+

–

l

, I

)

= 0V

10

S (O) S (O

CC(O)

170

SR

Slew Rate (Note 8)

= 15V, V

= 26mV to 380mV, A = 50V/V

0.03

0.02

0.05

V/µs

CC

SENSE

V

l

+

–

I

Short-Circuit Current

I

, I

8

15

60

mA

V

SC

SC SC

S(TOTAL)

l

Reverse V Supply

= –200µA, V = Open

50

S

CC

V

Minimum Output Voltage

V

= 0V, No Load

= V – V = –100mV, A = 50V/V, No

15

35

25

mV

O(MIN)

O(MAX)

SENSE

Load

+

–

S

V

l

V

Output High (Referred to V

)

A = 50V/V, V

= 100mV, I = 0

75

85

125

175

140

160

250

400

mV

CC

V

SENSE

L

V

= 100mV, I = 100µA

SENSE

L

= 100mV, I = 500µA

= 100mV, I = 1mA

+

–

l

I

S

, I (Off) Sense Input Current (Power Down)

V

CC

= 0V, V = 48V, V = 0V

SENSE

0.001

1

µA

S

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: ESD (Electrostatic Discharge) sensitive devices. Extensive use of

ESD protection devices are used internal to the LT6100, however, high

electrostatic discharge can damage or degrade the device. Use proper ESD

handling precautions.

Note 5: The LT6100C is guaranteed to meet specified performance from

0°C to 70°C. The LT6100C is designed, characterized and expected to

meet specified performance from –40°C to 85°C but is not tested or

QA sampled at these temperatures. The LT6100I is guaranteed to meet

specified performance from –40°C to 85°C. The LT6100H is guaranteed to

meet specified performance from –40°C to 125°C.

Note 6: This parameter is not 100% tested.

Note 7: Gain error for A = 12.5, 25V/V is guaranteed by the other gain

V

Note 3: A heat sink may be required to keep the junction temperature

error tests.

below absolute maximum ratings.

Note 8: Slew rate is measured on the output between 3.5V and 13.5V.

Note 4: The LT6100C/LT6100I are guaranteed functional over the

operating temperature range of –40°C to 85°C. The LT6100H is guaranteed

functional over the operating temperature range of –40°C to 125°C.

6100fc

5

LT6100

Typical perForMance characTerisTics

Input Offset Voltage

vs Temperature

Input Offset Voltage

vs V_S⁺Input Voltage

Input Offset Voltage

vs V_CCSupply Voltage

1.5

1.0

400

300

350

300

V

= 100mV

SENSE

CC

9 TYPICAL UNITS

T

= 85°C

= 25°C

= 3V

A

V

= 6.4V

= 5V

S

CC

T

= –40°C

= 125°C

A

T

= 25°C

0.5

A

200

T

A

250

0

100

–0.5

–1.0

–1.5

–2.0

–2.5

–3.0

–3.5

= 85°C

T

= –40°C

200

150

100

50

A

0

V

= 100mV

SENSE

S

+

= 48V

–100

–200

–300

– 400

T

= 125°C

A

0

10 15 20 25

SUPPLY VOLTAGE (V)

40

0

40

0

5

30 35

10

20

30

50

–40 –25 –10

5

20 35 50 65 80 95 110 125

TEMPERATURE (°C)

6100 G21

+

V

INPUT VOLTAGE (V)

V

S

CC

6100 G01

6100 G02

Output Voltage vs Sense Voltage

Gain vs Temperature

50.06

50.04

50.02

50.00

49.98

49.96

49.94

49.92

49.90

49.88

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

+

7 TYPICAL UNITS

V

A

T

= 4.4V TO 48V

= 3V

V

T

= 6.4V TO 48V

= 5V

S

T

= –40°C

S

V

= 50mV TO 80mV

A

V

SENSE

S

CC

V

CC

= 10V/V

= –40°C TO 125°C

CC

+

> 6.6V

V

A

= 6.4V TO 48V

= 5V

= 50V/V

= –40°C TO 125°C

V

A

T

= –40°C

S

A

V

> 4.6V

T

= –40°C

S

A

V

T

= –40°C

S

A

V

= 6.4V

= 4.4V

0

180

240

–

300

–40 –25 –10

5

20 35

125

–150

–90

–30

150

60

120

50 65 80 95 110

30

+

90

+

–

SENSE VOLTAGE (V – V ) (mV)

TEMPERATURE (°C)

SENSE VOLTAGE (V – V )(mV)

S

6100 G04

6100 G05

6100 G03

Negative Sense Input Current

vs Sense Voltage

Positive Sense Input Current

vs Sense Voltage

Output Positive Swing

vs Load Current

12

10

8

35

30

25

20

15

10

5

350

300

+

V

= 4.4V TO 48V

= 3V

V

= 4.4V TO 48V

= 3V

V

A

= 6.4V

= 5V

S

CC

= 150mV

SENSE

= 50V/V

T

= 125°C

T

= 125°C

A

V

250

T

= 85°C

A

T

= 85°C

A

T

= 25°C

A

200

150

100

50

T

= 125°C

A

6

T

= –40°C

A

T

= 85°C

= 25°C

= –40°C

A

T

= 25°C

A

4

T

= –40°C

A

2

0

–5

0

30

70

–110 –70 –30

110

–30

–110 –70

30

+

70

110

0

0.3

0.7

0.9 1.0

0.8

0.1 0.2

0.4 0.5

0.6

+

–

SENSE VOLTAGE (V – V ) (mV)

LOAD CURRENT (mA)

SENSE VOLTAGE (V – V ) (mV)

S

6100 G06

6100 G07

6100 G08

6100fc

6

LT6100

Typical perForMance characTerisTics

V_CCSupply Current vs

V_SInput Voltage

Op Amp Output Impedance

vs Frequency

Gain vs Frequency

50

40

30

20

200

180

160

140

120

100

80

10k

1k

+

–

V

= 0V

V

= 12.1V

= 10V

SENSE

CC

V

, V = 6.5V

S

CC

S

= 3V

A

= 50

= 10

= 5V

= –5V

V

CC

EE

FIL = 0V

T

= 125°C

A

T

= 85°C

A

100

10

0

T

= 25°C

A

G2 = 5V/V

G2 = 2V/V

T

= –40°C

A

–10

–20

–30

–40

–50

60

G2 = 1V/V

100k

40

1

20

0.1

0

10

20

30

40

50

1k

10k

1M

100

1k

10k

100k

1M

10M

TOTAL V INPUT VOLTAGE (V)

FREQUENCY (Hz)

S

FREQUENCY (Hz)

6100 G10

6100 G09

6100 G23

CMRR vs Frequency

V_CCPSRR vs Frequency

Gain Error vs V_SENSE

150

130

110

90

1

0

V

S

= 10V

= 100mV

V

= 6.4V

= 5V

S

CC

140

120

100

80

V

SENSE

V

= 5V

CC

70

–1

–2

60

50

40

30

+

V

= 6.4V

S

V

= 5V

CC

= 10V/V

= 25°C

20

10

A

V

A

T

–10

0.1

0

–3

1

10 100 1k 10k 100k 1M

10

100

1k

10k

100k

1M

0

50

100

150

200

250

300

V

(mV)

FREQUENCY (Hz)

SENSE

6100 G12

6100 G11

6100 G24

Sense Input Current (V_CCPowered

Step Response at V_SENSE= 0V to

130mV

Step Response at V_SENSE= 0V to

130mV

+

Down) vs V_S

10

1

+

–

V

= V

10V

S

10V

T

= 125°C

= 85°C

A

–

V

100mV/DIV

–

V

50mV/DIV

0.1

0.01

V

OUT

2V/DIV

500mV/DIV

0V

T

= 25°C

0V

A

6100 G13

6100 G14

+

V

S

A

V

C

L

= 10V

50µs/DIV

V

S

A

V

C

L

= 10V

0.2ms/DIV

= –40°C

= 10V/V

= 0pF

= 50V/V

= 0pF

0.001

0

10

20

V

30

40

50

+

(V)

S

6100 G25

6100fc

7

LT6100

Typical perForMance characTerisTics

Step Response at V_SENSE= 0V to

10mV

Step Response at V_SENSE= 0V to

10mV

Step Response at V_SENSE= 0V to

130mV

10V

V

20mV/DIV

10V

V

20mV/DIV

–

V

50mV/DIV

V

OUT

50mV/DIV

200mV/DIV

500mV/DIV

0V

6100 G15

6100 G16

6100 G17

+

V

A

C

= 10V

50µs/DIV

V

S

A

V

C

L

= 10V

50µs/DIV

V

A

C

= 10V

50µs/DIV

S

V

S

V

= 10V/V

= 0pF

= 50V/V

= 0pF

= 10V/V

= 1000pF

OUT

Step Response at V_SENSE= 0V to

130mV

Step Response at V_SENSE= 0V to

10mV

10V

V–

20mV/DIV

V–

100mV/DIV

V

OUT

V

2V/DIV

OUT

50mV/DIV

0V

6100 G18

6100 G19

+

V

S

A

V

C

L

= 10V

0.2ms/DIV

V

S

A

V

C

L

= 10V

50µs/DIV

= 50V/V

= 1000pF

= 10V/V

= 1000pF

Step Response at V_SENSE= 0V to

10mV

Start-Up Delay

10V

V–

10V

+

V

S

20mV/DIV

0V

1V

0V

V

OUT

V

OUT

200mV/DIV

0V

6100 G20

6100 G22

+

V

S

A

V

C

L

= 10V

50µs/DIV

V

A

V

= 5V

20µs/DIV

CC

SENSE

V

= 50V/V

= 1000pF

= 100mV

= 10V/V

= 0V

EE

6100fc

8

LT6100

pin FuncTions

–

V

(Pin 1): Negative Sense Input Terminal. Negative

A2 (Pin 6): Gain Select Pin. Refer to Table 1.

S

sense voltage input will remain functional for voltages

A4 (Pin 7): Gain Select Pin. When Pin 7 is shorted to V ,

EE

–

up to 48V. V is connected to an internal gain-setting

resistor R = 5k.

S

the total gain is 40V/V. When both Pin 6 and Pin 7 are

G1

shorted to V , the total gain is 50V/V. When both Pin 6

EE

V

(Pin 2): Supply Voltage Input. This power supply pin

and Pin 7 are opened, the total gain is 10V/V.

CC

suppliescurrenttobothcurrentsenseamplifierandopamp.

+

V

(Pin 8): Positive Sense Input Terminal. Connecting a

S

+

–

FIL (Pin 3): Filter Pin. Connects to an external capacitor

supply to V and a load to V will allow the LT6100 to

S S

+

to roll off differential noise of the system. Pole frequency

monitor the current through R

, refer to Figure 1. V

SENSE S

f

= 1/(2πR C), R = R + R = 60k.

is connected to an internal gain setting resistor R = 5k.

–3dB

FIL

E

O

G2

+

V

remains functional for voltages up to 48V.

S

V

(Pin 4): Negative Supply or Ground for Single Supply

EE

Operation.

V

(Pin5):VoltageOutputProportionaltotheMagnitude

OUT

of the Current Flowing Through R

:

SENSE

V

OUT

= A • (V

V )

OS

V

SENSE

V

is the input offset voltage. A is the total gain of the

V

OS

LT6100.

FuncTional DiagraM

R

SENSE

V

IN

LOAD

(V + 1.4V) TO 48V

CC

1

8

–

+

V

S

R

G2

5k

G1

5k

+

–

R

25k

A1

V

CC

2

–

+

2.7V TO 36V

V

OUT

R

E

Q1

A2

5

10k

V

O1

R

O

R

R/3

A4

50k

V

EE

FIL

A2

4

3

6

7

6100 F01

Figure 1. Functional Diagram

6100fc

9

LT6100

applicaTions inForMaTion

The LT6100 high side current sense amplifier (Figure 1)

provides accurate unidirectional monitoring of current

through a user-selected sense resistor. The LT6100 fea-

tures a fully specified 4.1V to 48V input common mode

Table 1. Gain Set with Pin 6 and Pin 7

A2 (PIN 6)

Open

V_EE

A4 (PIN 7)

Open

Out

G2

1

A_V

10

1.25

2

12.5

20

range. A high PSRR V supply (2.7V to 36V) powers the

CC

V_EE

Open

V_EE

current sense amplifier and the internal op amp circuitry.

The input sense voltage is level shifted from the positive

sense power supply to the ground reference and amplified

by a user-selected gain to the output. The buffered output

voltage is directly proportional to the current flowing

through the sense resistor.

Out

2.5

4

25

Open

V_EE

40

V_EE

5

50

Selection of External Current Sense Resistor

External R resistor selection is a delicate trade-off

SENSE

betweenpowerdissipationintheresistorandcurrentmea-

surement accuracy. The maximum sense voltage may be

as large as 300mV to get maximum dynamic range. For

high current applications, the user may want to minimize

the sense voltage to minimize the power dissipation in

the sense resistor. The LT6100’s low input offset voltage

of 80µV allows for high resolution of low sense voltages.

This allows limiting the maximum sense voltage while still

providing high resolution current monitoring.

Theory of Operation (Refer to Figure 1)

+

Current from the source at V flows through R

to

SENSE

S

–

the load at V , creating a sense voltage, V

. Inputs

S

+

–

V

S

and V apply the sense voltage to R . The opposite

S G2

ends of resistors R and R are forced to be at equal

G1

G2

potentials by the voltage gain of amplifier A1. The current

through R is forced to flow through transistor Q1 and is

G2

sourcedtonodeV .ThecurrentfromR flowingthrough

O1

G2

resistor R gives a voltage gain of ten, V /V

= R /

O

O1 SENSE

O

+

–

Kelvin connection of the LT6100’s V and V inputs to

S

R

G2

= 10V/V. The sense amplifier output at V is ampli-

O1

the sense resistor should be used to provide the highest

accuracy in high current applications. Solder connections

and PC board interconnect resistance (approximately

0.5mΩ per square) can be a large error in high current

systems. A 5A application might choose a 20mΩ sense

resistor to give a 100mV full-scale input to the LT6100.

Input offset voltage will limit resolution to 4mA. Neglect-

ing contact resistance at solder joints, even one square

of PC board copper at each resistor end will cause an

error of 5%. This error will grow proportionately higher

as monitored current levels rise.

fied again by amplifier A2. The inputs of amplifier A2 can

operate to ground which ensures that small sense voltage

signals are detected. Amplifier A2 can be programmed to

different gains via Pin 6 and Pin 7. Thus, the total gain of

the system becomes A = 10 • A2 and V

= V

• A .

V

OUT

SENSE V

Gain Setting

The LT6100 gain is set by strapping (or floating) the two

gain pins (see Table 1). This feature allows the user to

“zoom in” by increasing the gain for accurate measure-

ment of low currents.

A = 10V/V • G2, G2 is the gain of op amp A2.

V

6100fc

10

LT6100

applicaTions inForMaTion

Noise Filtering

an amplified, level shifted representation of the R

SENSE

voltage is developed at V . The output is well behaved

OUT

The LT6100 provides signal filtering via pin FIL that is

driving capacitive loads to 1000pF.

internally connected to the resistors R and R . This pin

E

O

maybeusedtofiltertheinputsignalenteringtheLT6100’s

internal op amp, and should be used when fast ripple cur-

rent or transients flow through the sense resistor. High

frequency signals above the 300kHz bandwidth of the

LT6100’s internal amplifier will cause errors. A capacitor

Sense Input Signal Range

The LT6100 has high CMRR over the wide input voltage

range of 4.1V to 48V. The minimum operation voltage of

the sense amplifier input is 1.4V above V . The output

CC

remains accurate even when the sense inputs are driven

connected between FIL and V creates a single pole low

EE

to 48V. Figure 2 shows that V changes very slightly

pass filter with corner frequency:

OS

over a wide input range. Furthermore, the sense inputs

f

= 1/(2πR C)

FIL

+

–

–3dB

V

and V can collapse to zero volts without incurring

S

where R = 60k. A 220pF capacitor creates a pole at

any damage to the device. The LT6100 can handle dif-

FIL

12kHz, a good choice for many applications.

ferential sense voltages up to the voltage of the sense

+

–

inputs supplies. For example, V = 48V and V = 0V can

S

Output Signal Range

be a valid condition in a current monitoring application

(Figure 3) when an overload protection fuse is blown and

TheLT6100’soutputsignalisdevelopedbycurrentthrough

–

V

S

voltage collapses to ground. Under this condition, the

R

intooutputresistorR .ThecurrentisV

/R .The

G2

O

SENSE G2

output of the LT6100 goes to the positive rail, V . There

OH

sense amplifier output, V , is buffered by the internal op

O1

is no phase inversion to cause an erroneous output signal.

ampsothatconnectingtheoutputpinstoothersystemswill

+

For the opposite case when V collapse to ground with

S

preserve signal accuracy. For zero V

, internal circuit

SENSE

–

V

S

held up at some higher voltage potential, the output

saturation with loss of accuracy occurs at the minimum

will sit at V . If both inputs fall below the minimum CM

OL

CC

V

OUT

swing, 15mV above V . V

may swing positive

EE OUT

voltage, V + 1.4V, the output is indeterminate but the

to within 75mV of V or a maximum of 36V, a limit set

CC

LT6100 will not be damaged.

by internal junction breakdown. Within these constraints,

1.5

TO LOAD

R

FUSE

V

A

= 100mV

SENSE

1

SENSE

CC

DC

1.0

0.5

= 3V

SOURCE

T

= 25°C

C1

0.1µF

8

–

+

0

V

S

–0.5

–1.0

–1.5

–2.0

–2.5

–3.0

–3.5

2

7

6

V

A4

A2

CC

+

C2

–

+

5V

0.1µF

3

FIL

OUT

4

5

OUTPUT

V

EE

LT6100

0

40

10

20

30

50

V

INPUT VOLTAGE (V)

6100 F03

S

6100 F02

Figure 2. V_OSvs V_SInput Voltage

Figure 3. Current Monitoring of a Fuse Protected Circuit

6100fc

11

LT6100

applicaTions inForMaTion

Low Sense Voltage Operation

V

= 15mV. The accuracy at small sense voltages can be

OL

improved by selecting higher gain. When gain of 50V/V

is selected, as shown in Figure 7, V leaves the clipped

Figure 4 shows the simplest circuit configuration in which

OUT

the LT6100 may be used. While V

(output voltage)

OUT

region for a positive V

to 2.5mV for gain of 10V/V (see Figure 6).

greater than 1mV compared

SENSE

increases with positive sense current, at V

= 0V,

SENSE

the LT6100’s buffered output can only swing as low as

1.6

V

A

= 4.4V TO 48V

S

TO LOAD

R

SENSE

= 3V

CC

= 10V/V

= 25°C

1.4

1.2

1.0

V

A

+

C1

0.1µF

T

5V

1

8

–

+

V

S

V

S

2

7

6

V

A4

A2

CC

0.8

0.6

+

C2

–

+

3V

0.1µF

3

FIL

0.4

0.2

0

OUT

4

5

OUTPUT

V

EE

30

60

120

0

150

90

+

LT6100

–

SENSE VOLTAGE (V – V ) (mV)

S

6100 F04

6100 F05

Figure 4. LT6100 Load Current Monitor

Figure 5. Output Voltage vs V_SENSE

0.40

0.35

0.30

0.25

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

V

A

T

= 4.4V TO 48V

= 3V

V

A

T

= 4.4V TO 48V

= 3V

S

CC

V

A

S

CC

V

A

= 10V/V

= 50V/V

= 25°C

0.20

0.15

0.10

0.05

0

5

10

20

0

25

30

15

0

5

10

15

30

20

25

+

–

+

–

SENSE VOLTAGE (V – V ) (mV)

S

6100 F06

6100 F07

Figure 6. Expanded View of Output Voltage vs V_SENSE, A_V= 10V/V

Figure 7. Expanded View of Output Voltage vs V_SENSE, A_V= 50V/V

6100fc

12

LT6100

applicaTions inForMaTion

Power Down While Connected to a Battery

its inputs remain high impedance (see Figure 8). This is

due to the implementation of Linear Technology’s Over-

The-Top^®input topology at its front end. When powered

down, the LT6100 inputs draw less than 1µA of current.

AnotheruniquebenefitoftheLT6100isthatyoucanleaveit

connectedtoabatteryevenwhenitisdeniedpower. When

the LT6100 loses power or is intentionally powered down,

I

SENSE

R

SENSE

TO LOAD

+

BATTERY

4.1V TO 48V

–

+

V

LT6100

S

POWER

–

+

DOWN OK

V

CC

3V

0V

V

CC

INPUTS

REMAIN

Hi-Z

FIL

V

OUT

V

A2

A4

EE

6100 F08

Figure 8. Input Remains Hi-Z when LT6100 is Powered Down

Typical applicaTion

Micro-Hotplate Voltage and Current Monitor

Adjust Gain Dynamically for Enhanced Range

+

I

SENSE

V

DR

R

SENSE

TO LOAD

FROM SOURCE

–

+

V

S

V

LT6100

S

10Ω

1%

–

+

V

S

–

+

I

HOTPLATE

–

+

5V

V

CC

5V

CURRENT

MONITOR

OUT

CC

LT6100

EE A2 A4

V

= 500mV/mA

FIL

V

OUT

MICRO-HOTPLATE

BOSTON

MICROSYSTEMS

MHP100S-005

V

A2

A4

EE

6100 TA05

5V

2N7002

M9

M3

(GAIN = 50)

0V

(GAIN = 10)

VOLTAGE

MONITOR

M1

LT1991

+

–

P1

P3

P9

V

– V

10

DR

V

=

OUT

–

6100 TA06

V

DR

www.bostonmicrosystems.com

6100fc

13

LT6100

package DescripTion

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

DD Package

8-Lead Plastic DFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1698 Rev C)

R = 0.125

0.40 0.10

TYP

5

8

0.70 0.05

3.5 0.05

2.10 0.05 (2 SIDES)

1.65 0.05

3.00 0.10

(4 SIDES)

1.65 0.10

(2 SIDES)

PIN 1

TOP MARK

(NOTE 6)

PACKAGE

OUTLINE

(DD8) DFN 0509 REV C

4

1

0.25 0.05

0.75 0.05

0.200 REF

0.25 0.05

0.50 BSC

0.50

BSC

2.38 0.10

2.38 0.05

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED

NOTE:

1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION

ON TOP AND BOTTOM OF PACKAGE

MS8 Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-ꢀꢂꢂ0 Rev F)

0.889 0.ꢀꢁ7

(.035 .005)

5.ꢁ3

(.ꢁ0ꢂ)

MIN

3.ꢁ0 – 3.45

(.ꢀꢁꢂ – .ꢀ3ꢂ)

3.00 0.ꢀ0ꢁ

(.ꢀꢀ8 .004)

(NOTE 3)

0.5ꢁ

(.0ꢁ05)

REF

0.ꢂ5

(.0ꢁ5ꢂ)

BSC

0.4ꢁ 0.038

(.0ꢀꢂ5 .00ꢀ5)

TYP

8

7 ꢂ

5

RECOMMENDED SOLDER PAD LAYOUT

3.00 0.ꢀ0ꢁ

(.ꢀꢀ8 .004)

(NOTE 4)

4.90 0.ꢀ5ꢁ

(.ꢀ93 .00ꢂ)

DETAIL “A”

0.ꢁ54

(.0ꢀ0)

0° – ꢂ° TYP

GAUGE PLANE

ꢀ

ꢁ

3

4

0.53 0.ꢀ5ꢁ

(.0ꢁꢀ .00ꢂ)

ꢀ.ꢀ0

(.043)

MAX

0.8ꢂ

(.034)

REF

DETAIL “A”

0.ꢀ8

(.007)

SEATING

PLANE

0.ꢁꢁ – 0.38

0.ꢀ0ꢀꢂ 0.0508

(.009 – .0ꢀ5)

(.004 .00ꢁ)

0.ꢂ5

(.0ꢁ5ꢂ)

BSC

TYP

MSOP (MS8) 0307 REV F

NOTE:

ꢀ. DIMENSIONS IN MILLIMETER/(INCH)

ꢁ. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.ꢀ5ꢁmm (.00ꢂ") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.ꢀ5ꢁmm (.00ꢂ") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.ꢀ0ꢁmm (.004") MAX

6100fc

14

LT6100

revision hisTory ^{(Revision history begins at Rev C)}

REV

DATE

DESCRIPTION

PAGE NUMBER

C

11/12 Corrected value in Output Signal Range section.

11

6100fc

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

15

LT6100

Typical applicaTions

800mA/1A White LED Current Regulator

D2

LED

WARNING! VERY BRIGHT

DO NOT OBSERVE DIRECTLY

L1

3µH

LED

CURRENT

D1

B130

0.030Ω

LT6100

+

–

V

S

V

IN

V

SW

3.3V TO 4.2V

SINGLE Li-Ion

IN

V

CC

LT3436

–

+

22µF

16V

CER

1210

SHDN

FB

C

LED

ON

124k

V

GND

OUT

V

EE A4 A2

MMBT2222

4.99k

4.7µF

6.3V

CER

8.2k

0.1µF

OPEN: 1A

CLOSED: 800mA

6100 TA02

D1: DIODES INC.

D2: LUMILEDS LXML-PW09 WHITE EMITTER

L1: SUMIDA CDRH6D28-3R0

Filtered Gain of 20 Current Sense

Gain of 50 Current Sense

I

SENSE

R

SENSE

R

SENSE

V

SUPPLY

6.4V TO 48V

SUPPLY

4.4V TO 48V

+

–

+

–

V

S

LOAD

V

S

LOAD

LT6100

S

–

+

V

CC

V

3V

5V

CC

FIL

V

OUT

1000pF

OUT

20 • R

• I

50 • R

• I

SENSE SENSE

V

A2

A4

V

A2

A4

EE

6100 TA03

6100 TA04

–3dB AT 2.6kHz

relaTeD parTs

PART NUMBER

DESCRIPTION

Dual Precision Instrumentation Switched Capacitor Building Block 120dB CMRR, 3V to 18V Operation

Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps 50µA Amplifier, 2.7V to 40V Operation, Over-The-Top Inputs

COMMENTS

LTC1043

LT1490/LT1491

LT1620/LT1621

Rail-to-Rail Current Sense Amplifiers

Accurate Output Current Programming, Battery Charging

to 32V

LT1787

Precision Bidirectional, High Side Current Sense Amplifier

75µV V , 60V, 60µA Operation

OS

LTC6101/LTC6101HV High Voltage, High Side, Precision Current Sense Amplifiers

4V to 60V/5V to 100V, Gain Configurable, SOT-23

6100fc

LT 1112 REV C • PRINTED IN USA

16 ^{LinearTechnology Corporation}

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

 LINEAR TECHNOLOGY CORPORATION 2005

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


型号：	LT6100CDD#TR
厂家：	Linear
描述：	LT6100 - Precision, Gain Selectable High Side Current Sense Amplifier; Package: DFN; Pins: 8; Temperature Range: 0°C to 70°C
文件：	总16页 (文件大小：325K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT6100CDD#TR [Linear]

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