National LMP8270, LMP8275 Data Manual
Summary
The LMP8271 and LMP8276 are high-precision, fixed-gain voltage difference amplifiers designed for demanding industrial applications. These devices excel at bidirectional current sensing and monitoring in power management systems due to their robust performance across extended common-mode voltage ranges (-5V to 36V) and high Common Mode Rejection Ratio (CMRR). The manual provides comprehensive specifications on electrical characteristics, operational limits, and optimal usage for engineers developing reliable low-side driver configurations requiring accurate current measurement.
Page 1 Text Content
查询LMP8271供应商 LM 8271,LM igh om on ode,G ain of 20,B idirectional P recision Voltage ifference
PRELIMINARY
plifiers
January
LMP8271, LMP8276 High Common Mode, Gain of 20, Bidirectional Precision Voltage Difference Amplifiers General Description Features
The LMP™8271, LMP8276 are fixed gain differential ampli- Bidirectional Current Sense Capability fiers with -2V to 27V input common mode voltage range Typical Values, TA 25˚C
and supply voltage range of 4.5V to 5.5V. The LMP8271, Input Offset Voltage 1m V max LMP8276 are precision amplifiers which will detect, amplify
TCVos (LMP8271) 15µV/˚C max
and filter small differential signals in the presence of high
TCVos (LMP8276) 30µV/˚C max
common mode voltages. The gain is fixed at and is
CMRR 80d B Min
adequate to drive an ADC to full scale in most cases. This
Extended CMVR -5V to 36V
fixed gain is achieved in two separate stages, pre-amplifier
Output Voltage Swing Rail to Rail
with gain of +10 and second stage amplifier with gain of
+2. The internal signal path is brought out on two pins that Bandwidth 80KHz provide connection for filter network. Operating Temperature Range (Ambient) -40˚C to 125˚C The LMP8271, LMP8276 will function with reduced specifi- Operating Temperature Range (bare die) -40˚C to 150˚C cations over the extended common mode input voltage Supply Voltage 4.5V to 5.5V
range of -5 to Volts. This feature makes the device Supply Current 1m A suitable for applications with load dump in automotive sys- tems.
Applications
The midrail offset adjustment pin enables the user to utilize
Fuel Injection Control
this device for bidirectional current sensing. This is achieved
Low Side Driver Configuration Current Sensing
by adjusting an externally set voltage reference. Accurate
Power Management Systems
bidirectional load current measurements are achieved when monitoring the output with respect to this reference voltage
Typical Application
Typical Application: Low side Current Sensing
LMP™ is trademark of National Semiconductor Corporation.
National Semiconductor Corporation DS201308 www.national.com
Page Summary Contents For National LMP8270, LMP8275 Data Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 5 |
| File Size | 458.70 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What is the typical operating temperature range?
The ambient operating temperature range is -40°C to 125°C, and for the bare die it is -40°C to 150°C.
How does this device handle high common mode voltages?
It provides both a standard CMVR of -2V to +27V and an enhanced ECMVR range from -5V to 36V, allowing operation with reduced specifications.
Can it be used for current sensing in automotive systems?
Yes, the supply current (1mA) is suitable for applications with load dump in automotive systems, and it supports bidirectional current sensing.
What is the guaranteed minimum common mode rejection ratio during AC operation?
The CMRR ratio is listed as TBD for AC performance at specified frequencies, but rated at 80dB minimum DC/AC for specific frequency ranges.