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PDF LT6108-1 Data sheet ( Hoja de datos )
| Número de pieza | LT6108-1 | |
| Descripción | High Side Current Sense Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n Current Sense Amplifier
– Fast Step Response: 500ns
– Low Offset Voltage: 125µV Maximum
– Low Gain Error: 0.2% Maximum
n Internal 400mV Precision Reference
n Internal Comparator
– Fast Response Time: 500ns
– Total Threshold Error: ±1.25% Maximum
– Latching or Non-Latching Comparator Option
n Wide Supply Range: 2.7V to 60V
n Supply Current: 450µA
n Low Shutdown Current: 5µA Maximum
n Specified for –40°C to 125°C Temperature Range
n Available in 8-Lead MSOP and 8-Lead (2mm × 3mm)
DFN Packages
APPLICATIONS
n Overcurrent and Fault Detection
n Current Shunt Measurement
n Battery Monitoring
n Motor Control
n Automotive Monitoring and Control
n Remote Sensing
n Industrial Control
LT6108-1/LT6108-2
High Side Current Sense
Amplifier with Reference
and Comparator
DESCRIPTION
The LT®6108 is a complete high side current sense device
that incorporates a precision current sense amplifier, an
integrated voltage reference and a comparator. Two ver-
sions of the LT6108 are available. The LT6108-1 has a
latching comparator and the LT6108-2 has a non-latching
comparator. In addition, the current sense amplifier and
comparator inputs and outputs are directly accessible. The
amplifier gain and comparator trip point are configured
by external resistors. The open-drain comparator output
allows for easy interface to other system components.
The overall propagation delay of the LT6108 is typically only
1.4µs, allowing for quick reaction to overcurrent condi-
tions. The 1MHz bandwidth allows the LT6108 to be used
for error detection in critical applications such as motor
control. The high threshold accuracy of the comparator,
combined with the ability to latch the comparator, ensures
the LT6108 can capture high speed events.
The LT6108 is fully specified for operation from –40°C to
125°C, making it suitable for industrial and automotive
applications. The LT6108 is available in the small 8-lead
MSOP and 8-lead DFN packages.
L, LT, LTC, LTM, TimerBlox, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
Circuit Fault Protection with Very Fast Latching Load Disconnect
12V
6.2V*
1k
3.3V
1k 10k
0.1Ω
100Ω
SENSEHI SENSELO
V+ OUTA
LT6108-1
RESET EN/RST
2N2700
250mA DISCONNECT OUTC V–
INC
IRF9640
TO LOAD
0.1µF
VOUT
6.04k
1.6k
*CMH25234B
610812 TA01a
Response to Overcurrent Event
VLOAD
10V/DIV
0V
ILOAD
200mA/DIV
0mA
VOUTC
5V/DIV 0V
250mA DISCONNECT
5µs/DIV
610812 TA01b
610812fa
1
1 page  
LT6108-1/LT6108-2
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature
ROUT = R1 +
range, otherwise specifications are at
R2 = 10k, gain = 100, RC = 25.5k, CL =
TCALC==252°pCF,.
uVn+le=s1s2oVt,hVePrwULiLsUePn=otVe+d,.V(SENee=
FViEgNu/RreST3=)
2.7V,
RIN
=
100Ω,
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Reference and Comparator
VTH(R)
(Note 9)
Rising Input Threshold Voltage
V+ = 2.7V to 60V, LT6108A
V+ = 2.7V to 60V, LT6108
l 395 400 405
l 392 400 408
VHYS
VHYS = VTH(R) – VTH(F)
V+ = 2.7V to 60V
Comparator Input Bias Current VINC = 0V, V+ = 60V
VOL Output Low Voltage
IOUTC = 500µA, V+ = 2.7V
3 10 15
l –50
60 150
l 220
High to Low Propagation Delay 5mV Overdrive
100mV Overdrive
3
0.5
Output Fall Time
0.08
tRESET
tRPW
Reset Time
Valid RST Pulse Width
LT6108-1 Only
LT6108-1 Only
l2
0.5
15
UNITS
mV
mV
mV
nA
mV
mV
µs
µs
µs
µs
µs
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: Input and output pins have ESD diodes connected to ground. The
SENSEHI and SENSELO pins have additional current handling capability
specified as SENSEHI, SENSELO Input Current.
Note 3: The LT6108I is guaranteed to meet specified performance from
–40°C to 85°C. LT6108H is guaranteed to meet specified performance
from –40°C to 125°C.
Note 4: Supply current is specified with the comparator output high. When
the comparator output goes low the supply current will increase by 75µA
typically.
Note 5: The full-scale input sense voltage and the maximum output
current must be considered to achieve the specified performance.
Note 6: Supply voltage and input common mode voltage are varied while
amplifier input offset voltage is monitored.
Note 7: The specified gain error does not include the effect of external
resistors
12V and
RIN
60V,
and ROUT. Although gain error is
similar performance is expected
only guaranteed between
for V+ < 12V, as well.
Note 8: Refer to SENSELO, SENSEHI Range in the Applications
Information section for more information.
Note 9: The input threshold voltage which causes the output voltage of the
comparator to transition from high to low is specified. The input voltage
which causes the comparator output to transition from low to high is
the magnitude of the difference between the specified threshold and the
hysteresis.
610812fa
5
5 Page 
BLOCK DIAGRAMS
LT6108-1
LT6108-1/LT6108-2
7
V+
100Ω
8 SENSEHI
SENSELO
1
2 EN/RST
3k
3k
V– V+
200nA
–
+
V–
ENABLE AND
RESET TIMING
RESET
34V
V+
3 OUTC
OVERCURRENT FLAG
6V
OUTA 6
V–
INC 5
400mV
REFERENCE
V– V–
4
Figure 1. LT6108-1 Block Diagram (Latching Comparator)
610812 F01
LT6108-2
7
V+
100Ω
8 SENSEHI
SENSELO
1
3k
3k
2 EN
V– V+
100nA
–
+
V–
34V
V+
3 OUTC
OVERCURRENT FLAG
6V
OUTA 6
V–
INC 5
400mV
REFERENCE
V– V–
4
Figure 2. LT6108-2 Block Diagram (Non-Latching Comparator)
610812 F02
610812fa
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT6108-1.PDF ] | |
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