LT2940CMS datasheet(5/24 Pages) LINER

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LT2940

2940f

VI (mV)

–200

400

600

200

–200

–400

800

2940 G01

VV = –8V

–4V

VV = VV+ – VV–

VI = VI+ – VI–

VCC ≥ 11V

VPMON = 0.5V

–2V

VI (mV)

–200

–1

–100

100

200

–2

–3

2940 G02

VV = 8V

–4V

|VV • VI| ≤ 0.4V

TA = 25°C

–2V

ONE REPRESENTATIVE UNIT

TEMPERATURE (°C)

–50

–4

–3

–1

–2

–25

100

125

2949 G03

–8V ≤ VV ≤ 8V

–200mV ≤ VI ≤ 200mV

|VV • VI| ≤ 0.4V

VCC = 12V

VCC = 80V

VCC = 12V

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: All currents into pins are positive, and all voltages are referenced

to GND unless otherwise noted. Current sourced by the PMON pin or the

IMON pin is deﬁned as positive; current sunk as negative.

Note 3: The LT2940 may safely drive its own PMON and IMON output

voltages above the absolute maximum ratings. Do not apply any external

source that drives the voltage above absolute maximum.

Note 4: Full-scale equals ±200μA.

Note 5: V+ and V– pin voltages must each fall within the voltage sense pin

operating range speciﬁcation.

Note 6: I+ and I– pin voltages must each fall within the current sense pin

operating range speciﬁcation.

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. All speciﬁcations apply at 6V ≤ VCC ≤ 80V, unless otherwise speciﬁed.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ICMPOUT(LK)

CMPOUT Leakage Current

CMP+ Low, VCC = 36V,

0.4V ≤ VCMPOUT ≤ 36V

±0.15

±1

μA

ICMPOUT(OL)

CMPOUT Output Low Voltage

CMP+ Low, ICMPOUT = 3mA

0.2

0.4

ICMPOUT(LK)

CMPOUT Leakage Current

CMP+ High, VCC = 36V,

0.4V ≤ VCMPOUT ≤ 36V

±0.15

±1

μA

tDLY

Comparator Propagation Delay

Output Pulling Down

0.7

μs

VLATCH(IL)

LATCH Input Low Voltage

0.5

0.8

1.2

VLATCH(IO)

LATCH Input Open Voltage

1.25

1.5

1.95

VLATCH(IH)

LATCH Input High Voltage

2.0

2.2

2.5

ILATCH(LK)

LATCH Input Allowable Leakage in

Open State

±10

μA

ILATCH(BIAS)

LATCH Input Bias Current

VLATCH = 0V

–11

–17

–23

μA

VLATCH = 80V

μA

TYPICAL PERFORMANCE CHARACTERISTICS

PMON Output Current

vs Sense Input Voltages

PMON Total Error

vs Sense Input Voltages

PMON Error Band vs Temperature

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