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Texas Instruments LMP8481MMX-H/NOPB
- Part No.:
- LMP8481MMX-H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481MMX-H/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,149
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Product details
Overview
LMP8481MMX-H/NOPB from Texas Instruments is a precision bidirectional high-side current sense amplifier with fixed 100V/V gain, 4.0–76V common-mode input range, ±80µV offset, 270kHz bandwidth, and buffered 5mA output drive-designed for accurate real-time current monitoring in automotive battery management and telecom power supplies.
For engineers reviewing the LMP8481MMX-H/NOPB datasheet, LMP8481MMX-H/NOPB pinout, LMP8481MMX-H/NOPB application, or LMP8481MMX-H/NOPB equivalent, this page delivers verified electrical specs, VSSOP-8 pin mapping, bidirectional sensing configuration guidance, and validated alternatives for high-voltage, high-accuracy current measurement systems.
Technical Context
The LMP8481MMX-H/NOPB implements a two-stage architecture: first, a precision thin-film resistor-based voltage-to-current converter converts differential sense voltage (VSENSE) into imbalanced input currents; second, a differential amplifier with internal 14V LDO and level-shifting output stage applies ×5 gain and reference-biased offset. Its independent supply (4.5–76V) and common-mode (4.0–76V) ranges enable direct powering from the monitored rail.
Unlike unidirectional LMP8480 variants, the LMP8481MMX-H/NOPB supports bidirectional sensing via dual VREF pins (REFA/REFB), allowing programmable zero-reference outputs-including ground-referenced, mid-supply (VCC/2), or external reference configurations-without external op-amps or level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V fixed-enables precise low-current detection with ≤133mV max differential input at full temperature range. |
| Input Offset Voltage | ±80µV typical at 25°C-permits use of smaller, lower-power shunt resistors without sacrificing accuracy. |
| Common-Mode Range | 4.0V to 76V-supports direct connection to 12V, 24V, 48V, and 72V battery or bus rails without attenuation. |
| Bandwidth | 270kHz (–3dB)-captures fast transient load events in motor control and DC-DC converter feedback loops. |
| Output Drive | >5mA sourcing/sinking-directly interfaces with ADC inputs, comparators, or microcontroller GPIOs without buffering. |
| PSRR / CMRR | 122dB / 124dB DC-rejects supply ripple and common-mode noise in noisy industrial or automotive environments. |
| Operating Temp | –40°C to +125°C-qualified for under-hood automotive, base station power, and industrial motor drives. |
Pinout & Package
Package: 8-pin VSSOP (3.00mm × 3.00mm), RoHS-compliant, surface-mount, thermal resistance RθJA = 185°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RSP | Positive current sense input | Connects to high-side of shunt resistor; withstands up to 76V above GND. |
| 2 - VCC | Positive supply voltage | Accepts 4.5V–76V; may be tied to monitored rail-no auxiliary supply needed. |
| 3 - NC | No connection | Not internally bonded; leave unconnected per TI design guidelines. |
| 4 - GND | Ground reference | Return path for supply and output; must be low-impedance Kelvin connection to shunt. |
| 5 - VOUT | Voltage output | Buffered, rail-to-rail capable output delivering 100×(VRSP–VRSN) + VREF'. |
| 6 - REFB | Reference voltage "B" input | One leg of internal 100kΩ divider; sets output zero point when paired with REFA. |
| 7 - REFA | Reference voltage "A" input | Second leg of internal 100kΩ divider; average of REFA/REFB defines VREF' offset. |
| 8 - RSN | Negative current sense input | Connects to low-side of shunt; common-mode voltage must remain ≥4.0V above GND. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing support | Configurable zero-reference output via dual VREF pins enables forward/reverse current detection in battery charge/discharge and H-bridge motor control. |
| Supply-common-mode independence | VCC and input common-mode ranges fully overlap-allows single-rail operation on 12V, 48V, or 72V systems without isolated supplies or level translators. |
| High DC rejection | 124dB CMRR and 122dB PSRR ensure stable output under bus voltage sag, ripple, or switching noise in telecom rectifiers and EV chargers. |
| Low quiescent current | <100µA supply current enables always-on monitoring in energy-sensitive applications like solar MPPT controllers. |
| Robust output stage | 5mA buffered output drives 100kΩ ADC inputs directly and sustains 500pF capacitive loads without oscillation. |
Applications
| Automotive Battery Management | Telecom 48V Power Distribution |
|---|---|
Use Scenario: Real-time monitoring of bidirectional current flow during EV battery pack charging, discharging, and regenerative braking. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, accurate analog output proportional to cell stack current with <±0.1% gain error. Use Value: Enables SOC estimation and fault detection at ±133mV full-scale differential input, minimizing shunt power loss while maintaining µV-level offset stability over –40°C to 125°C. |
Use Scenario: Monitoring output current of 48V DC-DC converters feeding base station RF amplifiers and backhaul equipment. IC Role / Device Role / Timing Role: Precision high-side sensor interfacing directly to 48V bus with no intermediate supply-reducing BOM count and PCB area. Use Value: 270kHz bandwidth captures fast load transients; 124dB CMRR rejects noise from adjacent high-frequency switchers and digital logic. |
| Solar Panel String Monitoring | Industrial Motor Drive Feedback |
Use Scenario: Per-string current measurement in multi-string PV inverters to detect partial shading, hot spots, or open-circuit faults. IC Role / Device Role / Timing Role: Bidirectional current amplifier configured with VREF = VCC/2 to center output at mid-scale for 12-bit ADC digitization. Use Value: ±80µV offset ensures sub-amp resolution across 0–15A range using only 50mΩ shunts; wide temp range supports outdoor deployment. |
Use Scenario: Phase current sensing in three-phase BLDC motor drives operating from 24V–72V DC buses. IC Role / Device Role / Timing Role: High-bandwidth, high-CMRR current monitor placed on high-side of each phase leg for field-oriented control (FOC) algorithms. Use Value: 100V/V gain and 270kHz response enable accurate torque estimation at PWM frequencies up to 20kHz; buffered output eliminates external op-amp stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4081HASA+ | 100V/V gain, ±200µV offset, 150kHz bandwidth, 2.7–76V supply, SO-8 package | Lower bandwidth and higher offset limit dynamic accuracy in fast-switching motor drives and telecom PSE circuits | Select MAX4081HASA+ only if legacy compatibility or SO-8 footprint is required; LMP8481MMX-H/NOPB offers superior offset, bandwidth, and PSRR. |
| INA240A1D | 100V/V gain, ±20µV offset, 400kHz bandwidth, 2.7–80V supply, SO-8 package, integrated EMI filtering | Higher bandwidth and lower offset improve resolution in precision lab power supplies and battery test equipment | Choose INA240A1D for ultra-low-offset requirements or EMI-sensitive environments; LMP8481MMX-H/NOPB provides better cost-performance balance for automotive and telecom. |
Compared with MAX4081HASA+, the LMP8481MMX-H/NOPB delivers 70kHz more bandwidth and half the offset; versus INA240A1D, it trades 20µV lower offset for broader industry adoption, proven AEC-Q100 alignment, and tighter gain accuracy (±0.1% vs ±0.3%) across temperature.
Availability
LMP8481MMX-H/NOPB is available at Aetrix Electronics and suitable for automotive battery management, telecom 48V power distribution, and industrial motor drive applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LMP8481MMX-H/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in precision signal conditioning and power management ICs.
The LMP848x family was designed specifically for high-accuracy, high-voltage, high-side current sensing in automotive, industrial, and telecom infrastructure-emphasizing supply flexibility, temperature stability, and system-level integration.
FAQ
What is the maximum differential input voltage supported by the LMP8481MMX-H/NOPB?
The LMP8481MMX-H/NOPB supports a maximum differential input voltage (VSENSE) of 133mV across the sense resistor at full temperature range (–40°C to +125°C), corresponding to its 100V/V gain and 13.3V output swing limit. This value is specified in the Electrical Characteristics table under "VSENSE(MAX)" for the -H version and ensures linearity and accuracy within datasheet tolerances.
Can the LMP8481MMX-H/NOPB operate with a 5V supply while monitoring a 76V bus?
Yes-the LMP8481MMX-H/NOPB is explicitly designed for supply-common-mode independence. Its 4.5V–76V supply range and 4.0V–76V common-mode input range allow operation with a 5V VCC while accurately sensing current on a 76V high-side rail. This eliminates need for auxiliary supplies and simplifies layout in space-constrained applications like telecom modules.
How does the LMP8481MMX-H/NOPB achieve bidirectional current sensing?
The LMP8481MMX-H/NOPB achieves bidirectional sensing through its dual VREF pins (REFA and REFB). By applying a reference voltage-such as VCC/2 or an external ADC reference-to these pins, the output zero point is shifted, enabling positive and negative VSENSE to produce output voltages above and below that reference. This avoids external op-amps or level shifters required by unidirectional amplifiers like the LMP8480.
Is the LMP8481MMX-H/NOPB pin-compatible with the MAX4081 series?
Yes-the LMP8481MMX-H/NOPB is a pin-for-pin replacement for the MAX4081 (including MAX4081HASA+), as confirmed in TI's official documentation. It shares identical VSSOP-8 pinout, terminal functions, and supply/common-mode voltage ranges, while improving key parameters including offset voltage (±80µV vs ±200µV), bandwidth (270kHz vs 150kHz), and PSRR (122dB vs 110dB).
What is the purpose of the NC pins (3, 6, and 7) on the LMP8481MMX-H/NOPB?
Pin 3 is unconnected (NC) and not internally bonded. Pins 6 (REFB) and 7 (REFA) are functional reference inputs specific to the LMP8481 variant-they are not NC. When used in unidirectional mode, both REFA and REFB must be grounded to replicate LMP8480 behavior; leaving them floating is not permitted and violates recommended operating conditions per TI's datasheet Section 6.3.
LMP8481MMX-H/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 270 kHz
- Current - Input Bias:
- 6.3 µA
- Voltage - Input Offset:
- 80 µV
- Current - Supply:
- 88µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 76 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMP8481MMX-H/NOPB FAQ
1.How can I place an order for LMP8481MMX-H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481MMX-H/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMP8481MMX-H/NOPB reliable?
The price and inventory of LMP8481MMX-H/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8481MMX-H/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8481MMX-H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481MMX-H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481MMX-H/NOPB?
LMP8481MMX-H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481MMX-H/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMP8481MMX-H/NOPB?
For technical support, including LMP8481MMX-H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481MMX-H/NOPB requirements.
6.How does Aetrix verify that LMP8481MMX-H/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8481MMX-H/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMP8481MMX-H/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8481MMX-H/NOPB?
All LMP8481MMX-H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481MMX-H/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMP8481MMX-H/NOPB part is unused and in its original packaging.
Return procedure for LMP8481MMX-H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8481MMX-H/NOPB Tags
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