LT1787 datasheet(3/12 Pages) LINER

Part #	LT1787

Description	Precision, High Side Current Sense Amplifiers

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Manufacturer	LINER [Linear Technology]

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LT1787/LT1787HV

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

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

ESD protection devices are used internal to the LT1787/LT1787HV,

however, high electrostatic discharge can damage or degrade the device.

Use proper ESD handling precautions.

Note 3: The LT1787C/LT1787HVC are guaranteed to meet specified

performance from 0

°C to 70° and are designed, characterized and

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

Total supply = (VS– – VEE) = 2.5V to 36V (LT1787), 2.5V to 60V (LT1787HV) unless otherwise specified.

expected to meet these extended temperature limits, but are not tested at

–40

°C and 85°C. The LT1787I/LT1787HVI are guaranteed to meet the

extended temperature limits.

Note 4: Testing done at VBIAS = 1.25V, VEE = 0V unless otherwise

specified.

Note 5: This parameter is not 100% tested.

VOS TC

Temperature Coefficient of VOS VS Supply = 5V (Note 5)

0.5

2

µV/°C

IOUT(O)

No-Load Output Current Error

VSENSE = 0V

4

nA

VOUT(O)

No-Load Output Voltage Error

VSENSE = 0V, VS Supply = 5V

–600

600

µV

(S8)

0

°C ≤ TA ≤ 70°C

q

– 1080

1080

µV

–40

°C ≤ TA ≤ 85°C

q

– 1600

1600

µV

No-Load Output Voltage Error

VSENSE = 0V, VS Supply = 5V

– 1000

1000

µV

(MS8)

0

°C ≤ TA ≤ 70°C

q

– 1840

1840

µV

–40

°C ≤ TA ≤ 85°C

q

– 2000

2000

µV

gm

Tranconductance, IOUT/VSENSE

±VSENSE = 10mV, 50mV, 100mV, 150mV, 250mV,

400

µA/V

VS Supply = Total Supply + |VSENSE|

AV

Gain, VOUT/VSENSE

±VSENSE = 100mV, VS Supply = 5V

q

7.6

8

8.4

V/V

Output Voltage Gain Error

q

–5

2

5

%

VS PSRR

VS Supply Rejection Ratio

VSENSE = 0V, VS Supply = 2.5V to 36V (LT1787)

q

120

135

dB

VSENSE = 0V, VS Supply = 2.5V to 60V (LT1787HV)

q

120

135

dB

VEE PSRR Negative Supply Rejection Ratio VSENSE = 0V, VS Supply = 15V, VBIAS = 0V,

q

100

130

dB

VEE = – 1V to – 15V (LT1787)

VSENSE = 0V, VS Supply = 40V, VBIAS = 0V,

q

100

130

dB

VEE = – 1V to – 15V (LT1787HV)

∆VOS

Change in Input Offset Voltage

VSENSE = 0V, VS Supply = 36V, VBIAS = 0.5V to 25V (LT1787)

q

100

130

dB

∆VBIAS

with Change in VBIAS Voltage

VSENSE = 0V, VS Supply = 60V, VBIAS = 0.5V to 25V (LT1787HV) q

100

130

dB

IS+(O)

Positive Input Sense Current

VSENSE = 0V

q

10

20

µA

IS–(O)

Negative Input Sense Current

VSENSE = 0V

q

50

100

µA

IEE(O)

Negative Supply Current

VSENSE = 0V

q

60

120

µA

IOUT

Output Current

VSENSE = ±128mV

±50

µA

VOUT

Output Voltage

VSENSE = ±128mV, VS

+

≥ 3.3V

VBIAS ±1.024

V

Ripple Rejection

VS+ = VS– = 20V, ∆VS Supply = 1V, f = 1kHz

q

80

88

dB

VOMIN

Minimum Output Voltage

VSENSE = 0V, VBIAS = 0V

q

30

45

mV

VSENSE = VS

+ – VS– = –128mV, VBIAS = 0V

10

mV

Unipolar Output

VSENSE = 2mV, VBIAS = 0V

q

32

50

mV

Saturation Voltage

VSENSE = 4mV, VBIAS = 0V

q

38

55

mV

VSENSE = 5mV, VBIAS = 0V

q

43

60

mV

VSENSE = 6mV, VBIAS = 0V

q

49

65

mV

VOMAX

Maximum Output Voltage

VS

+ – 0.75

V

RG1A, RG2A Input Gain-Setting Resistor

Pin 1 to Pin 2, Pin 7 to Pin 8

1.25

k

Ω

ROUT

Output Resistor

Pin 5 to Pin 6

20

k

Ω

(Note 4)

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