LMP8601MAX-NOPB Datasheet, PDF (1/29 Pages) Texas Instruments – 60-V Common-Mode Bidirectional Precision Current Sensing Amplifier

LMP8601, LMP8601-Q1
www.ti.com
SNOSAR2E – SEPTEMBER 2008 – REVISED MARCH 2013
60-V Common-Mode Bidirectional Precision Current Sensing Amplifier
Check for Samples: LMP8601, LMP8601-Q1
FEATURES
1
•2 Unless Otherwise Noted, Typical Values at T_A
= 25°C, V_S = 5.0V, Gain = 20x
– TCV_OS 10μV/°C Max
– CMRR 90 dB Min
– Input offset voltage 1 mV Max
– CMVR at V_S = 3.3V -4V to 27V
– CMVR at V_S = 5.0V -22V to 60V
– Operating Ambient Temperature Range -
40°C to 125°C
– LMP8601Q Available in Automotive AEC-
Q100 Grade 1 Qualified Version
– Single-Supply Bidirectional Operation
– All Min / Max Limits 100% Tested
APPLICATIONS
• High-Side and Low-Side Driver Configuration
Current Sensing
• Bidirectional Current Measurement
• Current Loop to Voltage Conversion
• Automotive Fuel Injection Control
• Transmission Control
• Power Steering
• Battery Management Systems
DESCRIPTION
The LMP8601 and LMP8601Q are fixed 20x gain
precision amplifiers. The part will amplify and filter
small differential signals in the presence of high
common mode voltages. The input common mode
voltage range is –22V to +60V when operating from a
single 5V supply. With 3.3V supply, the input
common mode voltage range is from –4V to +27V.
The LMP8601 and LMP8601Q are members of the
Linear Monolithic Precision (LMP^®) family and are
ideal parts for unidirectional and bidirectional current
sensing applications. All parameter values of the part
that are shown in the tables are 100% tested and all
bold values are also 100% tested over temperature.
The part has a precise gain of 20x 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 10x 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 Application Information.
Typical Applications
Inductive
D
48V
Load
+5V
G
48V
+
S
+5V
-
+
D
-
G
Inductive
S
Load
I_C
Charger
I_L
load
I_B
+3.3V
+
-
24V
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2013, Texas Instruments Incorporated