Automotive Grade, 40-V, Low- or High-Side, Voltage Output Current Sensing Amplifier - LMP8278Q-Q1

LMP8278Q-Q1 (ACTIVE)

Automotive Grade, 40-V, Low- or High-Side, Voltage Output Current Sensing Amplifier

 

Description

The LMP8278 is a fixed 14x gain precision current sense amplifier. The part amplifies and filters small differential signals in the presence of high common mode voltages. The part operates from a single 5V supply voltage. With an input common mode voltage range from -2V to +28V the gain is very precise (±0.5%). The part can handle common mode voltages in the range -2V to +40V with relaxed specifications. The LMP8278 is a member of the Linear Monolithic Precision (LMP) family and is ideal for unidirectional current sensing applications. The parameter values that are shown in the Electrical Characteristics table are 100% tested and all bold values are also 100% tested over temperature, unless otherwise noted.

The part has a precise gain of 14x which is adequate in most targeted applications to drive an ADC to its full scale value. The fixed gain is achieved in two separate stages, a preamplifier with a gain of 7x and an output stage buffer amplifier with a gain of 2x. The connection between the two stages of the signal path is brought out on two pins to enable the possibility to create an additional filter network around the output buffer amplifier. These pins can also be used for alternative configurations with different gain as described in .

The LMP8278Q incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC Q100 standard.

Features

  • TCVos ±15μV/°C Max
  • CMRR 80 dB Min
  • Input Offset Voltage ±2 mV max
  • CMVR −2V to 40V
  • Operating Ambient Temperature Range −40°C to 125°C
  • Single Supply Operation
  • Min / Max Limits 100% Tested unless Otherwise Noted
  • LMP8278Q Available in Automotive AEC-Q100 Grade 1 Qualified Version

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Parametrics Compare all products in Current Sense Amplifiers Analog Output

 
Common Mode Voltage (Max) (V)
Common Mode Voltage (Min) (V)
Input Offset (+/-) (Max) (uV)
Input Offset Drift (+/-) (Typ) (uV/C)
Gain (V/V)
Gain Error (%)
CMRR (Min) (dB)
Bandwidth (kHz)
Supply Voltage (Max) (V)
Supply Voltage (Min) (V)
Iq (Max) (mA)
Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Gain Error Drift (Max) (ppm/°C)
PSRR (Typ) (uV/V)
Specified Common Mode Voltage (V)
Specified Power Supply Voltage (V)
LMP8278Q-Q1
40   
-2   
2000   
2.5   
14   
1   
80   
90   
5.5   
4.5   
0.55   
Low-side Capable   
Automotive   
-40 to 125   
VSSOP   
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
25   
0.8   
12   
5   

LMP8278Q-Q1 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A
A ≤ 100 
4.5 ≤ 
V ≤ 5.5
-2 ≤ 
V ≤ 40
-40 ≤ 
C ≤ 125