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LT6118HDCB#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT6118
7
6118f
For more information www.linear.com/LT6118
Performance characteristics taken at T
A
= 25°C,
V
+
= 12V, V
PULLUP
= V
+
, V
LE
= 2.7V, R
IN
= 100Ω, R
OUT
= R1 + R2 = 10k, gain = 100, R
C
= 25.5k, C
L
= C
LC
= 2pF, unless otherwise noted.
(See Figure 2)
Hysteresis Distribution Hysteresis vs Temperature
Hysteresis vs Supply Voltage
LE Current vs Voltage
Typical perForMance characTerisTics
TEMPERATURE (°C)
–40
COMPARATOR HYSTERESIS (mV)
20
18
16
14
12
10
8
6
4
0
2
80
6118 G22
–10 20 50
125
11065–25 5 35 95
V
+
(V)
0
14
12
10
8
6
4
2
0
30 50
6118 G23
10 20
40
60
COMPARATOR HYSTERESIS (mV)
5 TYPICAL UNITS
LE VOLTAGE (V)
0
–250
LE CURRENT (nA)
–200
–150
–100
–50
50
10
20 30 40
6118 G24
50 60
0
V
+
= 12V
COMPARATOR HYSTERESIS (mV)
3
0
PERCENTAGE OF UNITS (%)
5
10
15
20
30
–40°C 25°C 125°C
4.6 6.2
7.7 9.3 10.9 12.5
6118 G21
14.1 15.7 17.3
25
Comparator Input Bias Current
vs Input Voltage
COMPARATOR INPUT VOLTAGE (V)
–20
COMPARATOR INPUT BIAS CURRENT (nA)
–10
0
10
–15
–5
5
0.2 0.4 0.6 0.8
6118 G26
1.0
0
125°C
25°C
–40°C
Comparator Input Bias Current
vs Input Voltage
COMPARATOR INPUT VOLTAGE (V)
–20
COMPARATOR INPUT BIAS CURRENT (nA)
–10
0
10
–15
–5
5
20 40
6118 G25
60
0
125°C
25°C
–40°C
Comparator Propagation Delay
vs Input Overdrive
Comparator Output Leakage
Current vs Pull-Up Voltage
Comparator Output Low Voltage
vs Output Sink Current
I
OUTC
(mA)
0
0
V
OL
OUTC (V)
0.25
0.50
0.75
1.00
1 2
6118 G27
3
125°C
25°C
–40°C
COMPARATOR OUTPUT PULL-UP VOLTAGE (V)
0
–2
OUTC LEAKAGE CURRENT (nA)
3
8
13
18
23
125°C
10
20 30 40
6118 G28
50
60
–40°C AND 25°C
COMPARATOR INPUT OVERDRIVE (mV)
0
COMPARATOR PROPAGATION DELAY (µs)
3.0
4.0
5.0
160
6118 G29
2.0
1.0
2.5
3.5
4.5
1.5
0.5
0
40
80
120
200
RISING INPUT
FALLING INPUT
LT6118
8
6118f
For more information www.linear.com/LT6118
Comparator Rise/Fall Time
vs Pull-Up Resistor
Comparator Step Response
(5mV INC Overdrive)
Comparator Step Response
(100mV INC Overdrive)
Typical perForMance characTerisTics
Performance characteristics taken at T
A
= 25°C,
V
+
= 12V, V
PULLUP
= V
+
, V
LE
= 2.7V, R
IN
= 100Ω, R
OUT
= R1 + R2 = 10k, gain = 100, R
C
= 25.5k, C
L
= C
LC
= 2pF, unless otherwise noted.
(See Figure 2)
R
C
PULL-UP RESISTOR (kΩ)
1
10
RISE/FALL TIME (ns)
100
1000
10000
10 100
1000
6118 G30
V
OH
= 0.9 • V
PULLUP
V
OL
= 0.1 • V
PULLUP
100mV INC OVERDRIVE
C
L
= 2pF
FALLING
INPUT
RISING INPUT
V
INC
0.5V/DIV
0V
V
OUTC
2V/DIV
V
LE
5V/DIV
0V
0V
6118 G31
5µs/DIV
V
+
= 5V
0V
V
INC
0.5V/DIV
V
OUTC
2V/DIV
V
LE
5V/DIV
0V
0V
6118 G32
5µs/DIV
V
+
= 5V
Comparator Step Response
(5mV INC Overdrive)
Comparator Step Response
(100mV INC Overdrive) Comparator Reset Response
SENSELO (Pin 1): Sense Amplifier Input. This pin must
be tied to the load end of the sense resistor.
LE (Pin 2): Latch Control Pin. When high, the comparator
latch is enabled. With the comparator latch enabled, the
comparator output will latch at a low level once tripped.
When the LE input is low, the comparator latch is disabled
and the comparator functions transparently.
OUTC (Pin 3): Open-Drain Comparator Output. Off-state
voltage may be as high as 60V above V
–
, regardless of
V
+
used.
V
–
(Pin 4): Negative Supply Pin. This pin is normally con-
nected to ground.
INC (Pin 5): This is the inverting input of the comparator
.
The other comparator input is internally connected to the
400mV reference.
V
INC
0.5V/DIV
0V
V
OUTC
1V/DIV
6118 G33
5µs/DIV
0V
V
+
= 5V
V
LE
= 0V
V
INC
0.5V/DIV
0V
V
OUTC
1V/DIV
6118 G34
5µs/DIV
0V
V
+
= 5V
V
LE
= 0V
0V
V
OUTC
5V/DIV
V
LE
2V/DIV
0V
5µs/DIV
6118 G35
pin FuncTions
LT6118
9
6118f
For more information www.linear.com/LT6118
pin FuncTions
block DiagraM
100Ω
OUTA
–
+
–
+
7
8
1
6
INC
5
6118 F01
V
+
V
–
V
–
V
–
V
–
V
+
3k
V
+
3k
SENSEHI
SENSELO
100nA
OVERCURRENT FLAG
2
LE
3
OUTC
34V
6V
V
–
4
400mV
REFERENCE
Figure 1. Block Diagram
OUTA (Pin 6): Current Output of the Sense Amplifier. This
pin will source a current that is equal to the sense voltage
divided by the external gain setting resistor, R
IN
.
V
+
(Pin 7): Positive Supply Pin. The V
+
pin can be con-
nected directly to either side of the sense resistor, R
SENSE
.
When V
+
is tied to the load end of the sense resistor, the
SENSEHI pin can go up to 0.2V above V
+
. Supply current
is drawn through this pin.
SENSEHI (Pin 8): Sense Amplifier Input. The internal
sense amplifier will drive SENSEHI to the same potential
as SENSELO. A resistor (typically R
IN
) tied from supply
to SENSEHI sets the output current, I
OUT
= V
SENSE
/R
IN
,
where V
SENSE
is the voltage developed across R
SENSE
.
Exposed Pad (Pin 9, DCB Package Only): V
–
. The exposed
pad may be left open or connected to device V
–
. Connect-
ing the exposed pad to a V
–
plane will improve thermal
management in high voltage applications. The exposed
pad should not be used as the primary connection for V
–
.
applicaTions inForMaTion
The LT6118 high side current sense amplifier provides
accurate monitoring of currents through an external sense
resistor. The input sense voltage is level-shifted from the
sensed power supply to a ground referenced output and
is amplified by a user-selected gain to the output. The
output voltage is directly proportional to the current flow
-
ing through the sense resistor.
The LT6118 comparator has a threshold set with a built-in
400mV precision reference and has 10mV of hysteresis.
The open-drain output can be easily used to level shift to
digital supplies.
Amplifier Theory of Operation
An internal sense amplifier loop forces SENSEHI to have
the same potential as SENSELO as shown in Figure 2.
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LT6118HDCB#TRMPBF

Mfr. #:
Buy LT6118HDCB#TRMPBF
Manufacturer:
Analog Devices Inc.
Description:
Current Sense Amplifiers Current Sense Amp, Comparator with Latch Enable and Reference
Lifecycle:
New from this manufacturer.
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