Datasheet

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LMP8645
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LMP8645, LMP8645HV
www.ti.com SNOSB29F –NOVEMBER 2009–REVISED MARCH 2013
LMP8645/LMP8645HV Precision High Voltage Current Sense Amplifier
Check for Samples: LMP8645, LMP8645HV
1
FEATURES
DESCRIPTION
The LMP8645 and the LMP8645HV are precision
2
• Typical Values, T
A
= 25°C
current sense amplifiers that detect small differential
• High Common-Mode Voltage Range
voltages across a sense resistor in the presence of
– LMP8645 -2V to 42V
high input common mode voltages with a supply
voltage Range from 2.7V to 12V.
– LMP8645HV -2V to 76V
• Supply Voltage Range 2.7V to 12V
The LMP8645 accepts input signals with common
mode voltage Range from -2V to 42V, while the
• Gain Configurable with a Single Resistor
LMP8645HV accepts input signal with common mode
• Max Variable Gain Accuracy (with External
voltage Range from -2V to 76V. The LMP8645 and
Resistor) 2.0%
LMP8645HV have adjustable gain for applications
• Transconductance 200 μA/V
where supply current and high common mode voltage
are the determining factors. The gain is configured
• Low Offset Voltage 1 mV
with a single resistor, providing a high level of
• Input Bias 12 μA
flexibility, the accuracy could be as low as 2% (max)
• PSRR 90 dB
including the gain setting resistor. The output is
buffered in order to provide low output impedance.
• CMRR 95 dB
This high side current sense amplifier is ideal for
• Temperature Range −40°C to 125°C
sensing and monitoring currents in DC or battery
• 6-Pin SOT Package
powered systems, excellent AC and DC
specifications over temperature, and keeps errors in
APPLICATIONS the current sense loop to a minimum. The LMP8645
is an ideal choice for industrial, automotive and
• High-Side Current Sense
consumer applications, and it is available in SOT-6
• Vehicle Current Measurement
package.
• Motor Controls
• Battery Monitoring
• Remote Sensing
• Power Management
Typical Application
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.