LMP8645_15 Datasheet, PDF (1/30 Pages) Texas Instruments – LMP8645, LMP8645HV Precision High Voltage Current Sense Amplifier

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LMP8645, LMP8645HV
SNOSB29G – NOVEMBER 2009 – REVISED SEPTEMBER 2015
LMP8645, LMP8645HV Precision High Voltage Current Sense Amplifier
1 Features
•1 Typical Values, T_A = 25°C
• High Common-Mode Voltage Range
– LMP8645 –2 V to 42 V
– LMP8645HV –2 V to 76 V
• Supply Voltage Range 2.7 V to 12 V
• Gain Configurable With a Single Resistor
• Maximum Variable Gain Accuracy (With External
Resistor) 2%
• Transconductance 200 μA/V
• Low Offset Voltage 1 mV
• Input Bias 12 μA
• PSRR 90 dB
• CMRR 95 dB
• Temperature Range −40°C to 125°C
• 6-Pin SOT Package
2 Applications
• High-Side Current Sense
• Vehicle Current Measurement
• Motor Controls
• Battery Monitoring
• Remote Sensing
• Power Management
3 Description
The LMP8645 and the LMP8645HV devices are
precision current sense amplifiers that detect small
differential voltages across a sense resistor in the
presence of high-input common-mode voltages.
Operating from a supply range of 2.7 V to 12 V, the
LMP8645 accepts input signals with a common-mode
voltage range of –2 V to 42 V, while the LMP8645HV
accepts input signals with a common-mode voltage
range of –2 V to 76 V. The LMP8645 and
LMP8645HV have adjustable gain for applications
where supply current and high common-mode voltage
are the determining factors. The gain is configured
with a single resistor, providing a high level of
flexibility, as well as accuracy as low as 2%
(maximum) including the gain setting resistor. The
output is buffered to provide low output impedance.
This high-side current sense amplifier is ideal for
sensing and monitoring currents in DC or battery-
powered systems, has excellent AC and DC
specifications over temperature, and keeps errors in
the current sense loop to a minimum. The LMP8645
is an ideal choice for industrial, automotive, and
consumer applications, and is available in SOT-6
package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMP8645
LMP8645HV
SOT (6)
1.60 mm × 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
R_S
I_S
+IN
-IN
R_IN
R_IN ^LMP8645
L
o
a
d
+-
V⁺
V_A
ADC
+
V_OUT
V^-
R_G
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.