LT6100
Precision, Gain Selectable
High Side Current Sense
Amplifier
DESCRIPTIO
The LT
廬
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.
The LT6100 sense inputs have a voltage range that ex-
tends 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.
Input offset is a low 300碌V. CMRR and PSRR are in excess
of 105dB, resulting in a wide dynamic range. A filter pin is
provided to easily implement signal filtering with a single
capacitor.
The LT6100 has a separate supply input, which operates
from 2.7V to 36V and draws only 60碌A. When V
CC
is
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.
FEATURES
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Input Offset Voltage: 300
碌
V (Max)
Sense Inputs Up to 48V
0.5% Gain Accuracy
Pin Selectable Gain: 10, 12.5, 20, 25, 40, 50V/V
Separate Power Supply: 2.7V to 36V
Operating Current: 60碌A
Sense Input Current (V
CC
Powered Down): 1nA
Reverse Battery Protected to 鈥?48V
Buffered Output
Noise Filtering Input
鈥?0擄C to 125擄C Operating Temperature Range
Available in 8-Lead DFN and MSOP Packages
APPLICATIO S
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Battery Monitoring
Fuse Monitoring
Portable and Cellular Phones
Portable Test/Measurement Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
4.4V TO 48V
SUPPLY
LT6100
+
8 V
S
0A to 33A High Side Current Monitor with 12kHz Frequency Rolloff
3V
Input Offset Voltage
vs V
S
Sense Input Voltage
1.5
V
SENSE
= 100mV
V
CC
= 3V
T
A
= 25擄C
V
CC
A4
A2
INPUT OFFSET VOLTAGE (mV)
2
7
6
1.0
0.5
0
鈥?.5
鈥?.0
鈥?.5
R
SENSE
3m鈩?/div>
鈥?/div>
1 V
S
V
EE
4
CONFIGURED FOR GAIN = 25V/V
V
OUT
5
V
OUT
= 2.5V
I
SENSE
= 33A
LOAD
FIL
3
220pF
6100 TA01a
0
5
U
U
U
10 15 20 25 30 35 40 45 50
V
S
SENSE INPUT VOLTAGE (V)
6100 TA01b
6100f
1
LT6100HMS8相關型號PDF文件下載
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