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LMP8278QMMX/NOPB

AEC-Q100, -2 to 40V, split-stage current sense amplifier w/ in-line filter capability

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LMP8278QMMX/NOPB
Datasheet:

LMP8278QMMX/NOPB Datasheet (PDF)
Common-mode voltage (max) (V):

40
Common-mode voltage (min) (V):

-2
Input offset (±) (max) (µV):

2000
Input offset drift (±) (typ) (µV/°C):

2.5
EDA/CAD Models:

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LMP8278QMMX/NOPB General 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.

Key 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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Specifications

Product type	Analog output	Common-mode voltage (max) (V)	40
Common-mode voltage (min) (V)	-2	Input offset (±) (max) (µV)	2000
Input offset drift (±) (typ) (µV/°C)	2.5	Voltage gain (V/V)	14
CMRR (min) (dB)	80	Bandwidth (kHz)	90
Supply voltage (max) (V)	5.5	Supply voltage (min) (V)	4.5
Iq (max) (mA)	0.55	Number of channels	1
Comparators (#)	0	Gain error (%)	1
Gain error drift (±) (max) (ppm/°C)	25	Slew rate (V/µs)	0.7
Features	Low-side Capable	Rating	Automotive
Operating temperature range (°C)	-40 to 125	feature-type	Current Sense Amplifier
feature-number-of-elements-per-chip	1	feature-number-of-channels-per-chip	1
feature-rail-to-rail		feature-typical-gain-bandwidth-product-mhz
feature-maximum-voltage-gain-db	16.99	feature-minimum-cmrr-db	85(Typ)
feature-minimum-psrr-db	80(Typ)	feature-output-type
feature-maximum-input-offset-voltage-mv	2@5V	feature-maximum-input-bias-current-ua	0.00002(Typ)@5V
feature-maximum-input-resistance-mohm		feature-maximum-power-dissipation-mw
feature-packaging	Tape and Reel	feature-rad-hard
feature-pin-count	8	feature-cecc-qualified	No
feature-esd-protection		feature-escc-qualified
feature-military	No	feature-aec-qualified	Yes
feature-aec-qualified-number	AEC-Q100	feature-eccn-code	EAR99
feature-svhc	No	feature-svhc-exceeds-threshold	No