LINEAR TECHNOLOGY LT1999 Technical data
Precision High Side Current Sense Amplifiers
LT1999: High Voltage Bidirectional Current Sense Amplifier
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Buffered Output with 3 Gain Options:
10V/V, 20V/V, 50V/V
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AC CMRR > 80dB at 100kHz
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Gain Accuracy: 0.5% Max
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Input Common Mode Voltage Range: –5V to 80V
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Smooth Continuous Operation Over Entire Common
Mode Range
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Low Power Shutdown <10µA
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–55°C to 150°C Operating Temperature Range
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8-Lead MSOP and 8-Lead SO (Narrow) Packages
The LT1999 accurately measures fast switching currents in H-bridge motor controls, switching power supplies, solenoids and
battery chargers. It features a –5V to 80V input common mode voltage range, 2MHz bandwidth, less than 1.5mV offset voltage
and 0.5% gain error over temperature. With more than 80dB common mode rejection at 100kHz, the LT1999 maintains outstanding
accuracy even in the presence of large square wave input voltages.
0.0005
<10µV Offset
I
LOAD
+
LTC6102
IN
–
V
IN
OUT
–
Resolve µAmps from Amps Reduce R
Up to 105V Input
24.9
V
= I
OUT
LOAD
(10-Bit Precision at 25A)
4.99K
SENSE
/10
by 99%
LTC6102: Zero-Drift High Side Current Sense Amplifier
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Supply Range:
4V to 60V, 70V Maximum (LTC6102)
5V to 100V, 105V Maximum (LTC6102HV)
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±10µV Input Offset Maximum
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±50nV/°C Input Offset Drift Maximum
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Fast Response: 1µs Step Response
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PSRR 130dB Minimum
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Operating Temperature Range: –40°C to 125°C
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8-Lead MSOP and 3mm x 3mm DFN Package
The LTC®6102 zero-drift high side current sense amplifier has the precision to resolve microamps from amps of load current. Its
outstanding accuracy can be used to attain high precision with a lower value sense resistor, resulting in less power loss and heat
dissipation in the sense element.
Part LT1999
Key
Features
Current
Direction
High Speed
AC
Bidirectional Unidirectional Unidirectional Unidirectional Unidirectional Unidirectional Unidirectional Bidirectional Bidirectional Unidirectional
Common
Mode
–5V to 80V
Voltage
Response
Time
VOS
Maximum
1µs 1µs 1µs 3.5µs 3.5µs 3µs 1µs 1µs 10µs 40µs
750µV 10µV 300µV 250µV 250µV 300µV 450µV 450µV 100µV 300µV
LTC6102HV
Zero-Drift VCM to 105V Lowest Cost
4V to 70V
5V to 105V
VOS Drift 5µV/°C 25nV/°C 1µV/°C 1µV/°C 1µV/°C 0.5µV/°C 1.5µV/°C 1.5µV/°C 0.5µV/°C 0.5µV/°C
LTC6102
I
BIAS
Maximum
175µA 3nA 170nA 40nA 40nA 25µA 170nA 170nA 20nA 10µA
Gain 10, 20, 50V/V R-Set R-Set R-Set R-Set R-Set R-Set R-Set 8V/V Pin-Set
PSRR
Minimum
80dB @
100kHz
120dB 118dB 106dB 106dB 100dB 110dB 110dB 120dB 105dB
LTC6101
LTC6101HV LT6106 LT6107 LT6105 LTC6103 LTC6104
4V to 70V
5V to 105V
–55°C to
150°C
2.7V to 44V 2.7V to 44V –0.3V to 44V 4V to 70V 4V to 70V
VCM Incl.
GND
Dual
Gain Set Each
Direction
LT1787
LT1787HV LT6100
Bidirectional Pin-Set Gain
2.5V to 40V
2.5V to 65V
4.1V to 48V
L, LT, LTC, LTM, Linear Technology, the Linear logo and Over-The-Top are
registered trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
I2C Temperature, Voltage and Current Monitor
The LTC®2990, a temperature, voltage and current monitor for 3V
to 5.5V systems, integrates a 14-bit ADC, 10ppm/°C reference
and I2C interface to provide submillivolt voltage resolution, as
well as accuracy of ±1°C internally and ±0.5°C remotely when
making temperature measurements.
Power
Supply
V1 V2
2
C
I
LTC2990
V3
V4
FPGA
Temp.
Diode
I2C Current and Voltage Monitor
The LTC4151 is a high side power monitor that operates over a wide voltage
range of 7V to 80V. In default operation mode, the onboard 12-bit ADC
continuously measures high side current, input voltage and an external voltage.
Data is reported through the I2C interface when polled by a host.
More Amplifiers for Current Sense Applications
With over 300 amplifiers in our portfolio, we have the tools to solve the most difficult current sense challenges. Visit our website for
a comprehensive application note and circuit collection covering low side, high side, unidirectional, bidirectional, negative supply,
motor and inductive loads, and many other applications.
Precision Op Amps
for Low Side Current
Sense
Over-The-Top® Op
Amps for High Side
Current Sense
Part Number V
LTC2050HV 0.5µV 75pA 2.7V to 12V 0V to (VS – 1.3V)
+
I
–
+
I
–
LOAD
LTC2054HV 0.5µV 0.6pA 2.7V to 12V 0V to (VS – 0.7V)
LT1677 20µV 2nA 2.5V to 44V 0V to V
LTC6078 7µV 0.2pA 2.7V to 6V 0V to V
LTC6081 70µV 0.2pA 2.7V to 6V 0V to V
LT1218 25µV 30nA 2V to 36V 0V to V
LT1800 75µV 25nA 2V to 12.6V 0V to V
LT1806 100µV 1µA 1.8V to 12.6V 0V to V
LT6220 70µV 15nA 2.2V to 12.6V 0V to V
LTC6240 50µV 0.2pA 2.8V to 12V 0V to V
Part Number V
LT1494 150µV 250pA 2.1V to 36V 0V to 36V
LT1636 50µV 5nA 2.6V to 44V 0V to 44V
LT1637 100µV 20nA 1.8V to 44V 0V to 44V
LT1672 150µV 250pA 2.1V to 36V 0V to 36V
LT1782 400µV 8nA 2.2V to 18V 0V to 18V
I
OS
I
OS
VS Range VIN Range (VCM)
BIAS
VS Range VIN Range (VCM)
BIAS
S
S
S
S
S
S
S
S
Difference Amps for
High or Low Side
I
Current Sense
Download our current sense circuit collection and
application note at www.linear.com/currentsense
www.linear.com/currentsense n 1-800-4-LINEAR
–
+
Part Number V
LT1990 900µV 2.4V to 36V –250V to 250V
LT1991 15µV 2.5nA 2.7V to 36V –60V to 60V
LT1995 1000µV 5V to 36V 0V to 36V
LT1996 15µV 2.5nA 2.7V to 36V –60V to 60V
I
OS
VS Range VIN Range (VCM)
BIAS
0311A
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