LMP8480-Q1 Datasheet, PDF (1/27 Pages) Texas Instruments – Automotive, 76-V, High-Side, High-Speed, Current Sense Amplifier

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LMP8480-Q1, LMP8481-Q1
SNVSAL6 – JULY 2016
LMP848x-Q1 Automotive, 76-V, High-Side, High-Speed, Current Sense Amplifier
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C6
• Bidirectional or Unidirectional Sensing
• Common Mode Voltage Range: 4.0 V to 76 V
• Supply Voltage Range: 4.5 V to 76 V
• Fixed Gains: 20, 60, and 100 V/V
• Gain Accuracy: ±0.1%
• Offset: ±80 µV
• Bandwidth (–3 dB): 270 kHz
• Quiescent Current: < 100 µA
• Buffered High-Current Output: > 5 mA
• Input Bias Current: 7 µA
• PSRR (DC): 122 dB
• CMRR (DC): 124 dB
• 8-Pin VSSOP Package
2 Applications
• Body Control Modules
• Powertrain
• Battery Management
• Inverters
3 Description
The automotive qualified LMP8480-Q1 and
LMP8481-Q1 are precision high-side current sense
amplifiers that amplify a small differential voltage
developed across a current sense resistor in the
presence of high input common-mode voltages.
These amplifiers are designed for bidirectional
(LMP8481-Q1 device) or unidirectional (LMP8480-Q1
device) current applications and accept input signals
with common-mode voltage range from 4 V to 76 V
with a bandwidth of 270 kHz. Because the operating
power supply range overlaps the input common-mode
voltage range, the LMP848x device may be powered
by the same voltage that is being monitored. This
benefit eliminates the need for an intermediate supply
voltage to be routed to the point of load where the
current is being monitored, resulting in reduced
component count and board space.
The LMP848x-Q1 family consists of fixed gains of 20,
60, and 100 for applications that demand high
accuracy over temperature. The low-input offset
voltage allows the use of smaller sense resistors
without sacrificing system error. The LMP8480-Q1
and LMP8481-Q1 devices are pin-for-pin
replacements for the MAX4080 and MAX4081
devices, offering improved offset voltage, wider
reference adjust range and higher output drive
capabilities. The LMP8480-Q1 and LMP8481-Q1
devices are available in a 8-pin VSSOP package.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LMP8480-Q1
VSSOP (8)
3.00 mm x 3.00 mm
LMP8481-Q1
VSSOP (8)
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
To Load
Typical Application Schematic
ISENSE
V_CC = +4.5V to +76V
RSENSE
C1
0.1 µF
VSENSE
RSP
GND
LMP8481-Q1
V_OUT
REFA
REFB
RSN
VIN+
ADC
VIN-
VREF
C2
0.1 µF
LM4140ACM-1.2
Copyright © 2016, Texas Instruments Incorporated
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. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.