4 to 76V current sense amplifier
Product details
Parameters
Package | Pins | Size
Features
- Typical Values: TA = 25°C
- Bidirectional or Unidirectional Sensing
- Common Mode Voltage Range: 4.0 V to 76 V
- Supply Voltage Range: 4.5 V to 76 V
- Fixed Gains: 20, 60, and 100 V/V
- Gain Accuracy: ±0.1%
- Offset: ±80 µV
- Bandwidth (–3 dB): 270 kHz
- Quiescent Current: < 100 µA
- Buffered High-Current Output: > 5 mA
- Input Bias Current: 7 µA
- PSRR (DC): 122 dB
- CMRR (DC): 124 dB
- Temperature Range: –40°C to 125°C
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Description
The LMP8480 and LMP8481 are precision high-side current sense amplifiers that amplify a small differential voltage developed across a current sense resistor in the presence of high input common-mode voltages. These amplifiers are designed for bidirectional (LMP8481) or unidirectional (LMP8480) current applications and accept input signals with common-mode voltage range from 4 V to 76 V with a bandwidth of 270 kHz. Because the operating power supply range overlaps the input common-mode voltage range, the LMP848x can be powered by the same voltage that is being monitored. This benefit eliminates the need for an intermediate supply voltage to be routed to the point of load where the current is being monitored, resulting in reduced component count and board space.
The LMP848x family consists of fixed gains of 20, 60, and 100 for applications that demand high accuracy over temperature. The low-input offset voltage allows the use of smaller sense resistors without sacrificing system error. The wide operating temperature range of –40°C to 125°C makes the LMP848x an ideal choice for automotive, telecommunications, industrial, and consumer applications. The LMP8480 and LMP8481 are pin-for-pin replacements for the MAX4080 and MAX4081, offering improved offset voltage, wider reference adjust range and higher output drive capabilities. The LMP8480 and LMP8481 are available in a 8-pin VSSOP package.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LMP848x Precision 76-V High-Side Current Sense Amplifiers With Voltage Output datasheet (Rev. E) | Feb. 27, 2017 |
Technical articles | How current-sense amplifiers monitor satellite health | Feb. 08, 2021 | |
Application note | Improving Power Amplifier Efficiency with Current Monitors (Rev. A) | Dec. 29, 2020 | |
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 | |
User guide | LMP8480EVM Current Shunt Monitors Guide (Rev. A) | Mar. 19, 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The Texas Instruments LMP8480/81 evaluation module (EVM) helps designers quickly evaluate the operation and performance of the LMP8480/81 76V Precision High Side Current Sense Amplifier. The EVM is ready to connect to power, load, and test instruments through the use of on-board terminals.
The EVM (...)
Features
- Selectable reference voltage options through jumpers (LMP8481)
- On-board sense resistor or external resistor
- Optional input EMI/RFI filtering
- Separate DUT and load supplies Sense voltage test points
- Optional output isolation resistor
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
Design files
-
download PMP30047 BOM.pdf (145KB) -
download PMP30047 Assembly Drawing.pdf (808KB) -
download PMP30047 PCB.pdf (628KB) -
download PMP30047 CAD Files.zip (711KB) -
download PMP30047 Gerber.zip (54KB)
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 |
---|---|---|
VSSOP (DGK) | 8 | 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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