-2 to 76V, 990kHz, configurable gain current sense amplifier
Product details
Parameters
Package | Pins | Size
Features
- Typical Values, TA = 25°C
- High Common-Mode Voltage Range
- LMP8645 –2 V to 42 V
- LMP8645HV –2 V to 76 V
- Supply Voltage Range 2.7 V to 12 V
- Gain Configurable With a Single Resistor
- Maximum Variable Gain Accuracy (With
External Resistor) 2% - Transconductance 200 µA/V
- Low Offset Voltage 1 mV
- Input Bias 12 µA
- PSRR 90 dB
- CMRR 95 dB
- Temperature Range –40°C to 125°C
- 6-Pin SOT Package
Description
The LMP8645 and the LMP8645HV devices are precision current sense amplifiers that detect small differential voltages across a sense resistor in the presence of high-input common-mode voltages.
Operating from a supply range of 2.7 V to 12 V, the LMP8645 accepts input signals with a common-mode voltage range of 2 V to 42 V, while the LMP8645HV accepts input signals with a common-mode voltage range of 2 V to 76 V. The LMP8645 and LMP8645HV have adjustable gain for applications where supply current and high common-mode voltage are the determining factors. The gain is configured with a single resistor, providing a high level of flexibility, as well as accuracy as low as 2% (maximum) including the gain setting resistor. The output is buffered to provide low output impedance. This high-side current sense amplifier is ideal for sensing and monitoring currents in DC or battery-powered systems, has excellent AC and DC specifications over temperature, and keeps errors in the current sense loop to a minimum. The LMP8645 is an ideal choice for industrial, automotive, and consumer applications, and is available in SOT-6 package.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LMP8645, LMP8645HV Precision High Voltage Current Sense Amplifier datasheet (Rev. G) | Sep. 30, 2015 |
Technical articles | How current-sense amplifiers monitor satellite health | Feb. 08, 2021 | |
E-book | Simplifying Current Sensing (Rev. A) | Jan. 09, 2020 | |
Technical articles | A key to accurate system thermal management: monitoring both current flow and temperature | Oct. 04, 2018 | |
Technical articles | System trade-offs for high- and low-side current measurements | Jun. 01, 2017 | |
Technical articles | Why should you care about overcurrent protection in your system? | Jun. 16, 2016 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Reference designs
Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)
Design files
-
download TIDA-00302 BOM.pdf (52KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
SOT-23-THIN (DDC) | 6 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
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