My Inquiry
My Account
Texas Instruments LMP8481MMX-T/NOPB
- Part No.:
- LMP8481MMX-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481MMX-T/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,263
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMP8481MMX-T/NOPB from Texas Instruments is a precision bidirectional high-side current sense amplifier with 20V/V fixed gain, 76V common-mode input range (4.0V–76V), ±80µV input offset voltage, and 270kHz bandwidth-designed for accurate real-time current monitoring in automotive battery management and telecom power supplies.
For engineers reviewing the LMP8481MMX-T/NOPB datasheet, LMP8481MMX-T/NOPB pinout, LMP8481MMX-T/NOPB application, or LMP8481MMX-T/NOPB equivalent, this page delivers verified technical context, validated pin functions, confirmed alternative options, and design-meaningful specifications for high-voltage, high-accuracy current sensing in production systems.
Technical Context
The LMP8481MMX-T/NOPB implements a two-stage architecture: first, a precision thin-film resistor-based voltage-to-current conversion stage referenced to input common-mode voltage; second, a differential amplifier with ×5 internal gain and level-shifting output stage powered by an internal 14V LDO. Its VREFA/VREFB inputs enable programmable zero-reference output for bidirectional sensing.
Unlike unidirectional LMP8480 variants, the LMP8481MMX-T/NOPB supports both bidirectional and unidirectional operation via external reference configuration-allowing mid-scale ADC interfacing (e.g., VCC/2) or ground-referenced output (both VREF pins grounded)-while maintaining full 76V common-mode tolerance and independent supply voltage operation (4.5V–76V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed-enables direct scaling of 50mV sense voltage to 1V output, simplifying ADC interface without external gain stages. |
| Input Offset Voltage | ±80µV max at 25°C-supports use of higher-value, lower-power shunt resistors (e.g., 10mΩ at 5A yields 50mV drop) while maintaining <0.2% error contribution. |
| Common-Mode Range | 4.0V to 76V-allows direct connection to 12V, 24V, 48V, and 72V battery rails without level-shifting or isolation. |
| Bandwidth | 270kHz (–3dB)-captures fast current transients in motor commutation or DC-DC phase-shifted PWM control loops. |
| Supply Voltage Range | 4.5V to 76V-permits single-supply operation from the monitored rail itself, eliminating auxiliary bias supplies and reducing BOM count. |
| Output Drive | >5mA sourcing/sinking-drives 10kΩ ADC input or RC filter directly without buffer amplifiers. |
| CMRR / PSRR | 124dB / 122dB DC-rejects noise from switching regulators and shared ground paths in high-noise industrial environments. |
Pinout & Package
Package: 8-pin VSSOP (3.00mm × 3.00mm), thermally enhanced for continuous operation at 125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RSP | Positive current sense input | Connects to high-side of shunt resistor; withstands up to 85V absolute max-enables direct placement at battery or bus node. |
| 2 - VCC | Positive supply voltage | Accepts 4.5V–76V; powers internal LDO and signal chain-can be tied to same rail as RSP for supply elimination. |
| 3 - NC | No connection | Not internally bonded-must remain floating; no PCB trace or thermal pad required. |
| 4 - GND | Ground reference | Analog ground return; must be star-connected near shunt to avoid sensing error from ground bounce. |
| 5 - VOUT | Voltage output | Buffered rail-to-rail capable output (min 3mV, max VCC–230mV); drives ADC, comparator, or analog controller directly. |
| 6 - REFB | Reference voltage "B" input | One leg of internal 100kΩ divider; sets output zero point when paired with VREFA-enables mid-scale or ground-referenced operation. |
| 7 - REFA | Reference voltage "A" input | Second leg of internal 100kΩ divider; average of REFA and REFB defines output offset-supports external VREF or VCC/2 biasing. |
| 8 - RSN | Negative current sense input | Connects to low-side of shunt; maintains >4.0V above GND for valid operation-prevents use in true low-side (<4V) configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing support | Configurable zero-reference output via dual VREF pins enables current direction detection (e.g., battery charge/discharge) without polarity reversal circuitry. |
| Integrated 14V LDO | Stabilizes internal analog core independently of VCC fluctuations-ensures consistent offset and gain performance across wide supply range. |
| High CMRR at DC and AC | 124dB DC and >80dB at 100kHz-maintains accuracy in presence of fast-switching noise from adjacent MOSFETs or gate drivers. |
| Low quiescent current | <100µA typical-enables always-on monitoring in energy-sensitive applications like EV battery standby diagnostics. |
| Wide temperature range | –40°C to +125°C operation-qualified for under-hood automotive and industrial power module deployments without derating. |
Applications
| Automotive Battery Monitoring | Telecom 48V Power Shelf |
|---|---|
|
Use Scenario: Real-time bidirectional current measurement in 12V/48V hybrid vehicle battery packs during regenerative braking and charging cycles. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, rail-referenced analog output to MCU ADC with <1µs transient response. Use Value: Enables SOC estimation and fault detection (e.g., short-circuit, open-wire) using same shunt for charge and discharge-reducing component count vs. dual unidirectional solutions. |
Use Scenario: Input current supervision in distributed telecom power systems where 48V backplane voltage must remain stable under dynamic load changes. IC Role / Device Role / Timing Role: High-common-mode monitor feeding analog watchdog circuit and digital PMBus controller for overcurrent shutdown within 20µs. Use Value: Maintains 0.1% gain accuracy across –40°C to 85°C ambient-eliminates need for per-unit calibration in field-deployed shelf controllers. |
| Motor Phase Current Sensing | Solar Array String Monitoring |
|
Use Scenario: High-side current feedback in three-phase BLDC inverter half-bridges operating at 20–50kHz PWM frequency. IC Role / Device Role / Timing Role: Fast-response current amplifier delivering clean analog signal to isolated sigma-delta ADC with 270kHz bandwidth and 20µs settling time. Use Value: Supports FOC (Field-Oriented Control) with <100ns timing margin between PWM edge and current sample-critical for torque ripple reduction. |
Use Scenario: String-level current monitoring in commercial PV inverters with 600–1000V DC input arrays and MPPT optimization. IC Role / Device Role / Timing Role: High-voltage sense front-end converting millivolt shunt voltage to robust 0–5V output referenced to string midpoint potential. Use Value: Operates reliably at 76V common-mode while rejecting common-mode transients up to ±2kV (IEC 61000-4-5)-reducing need for external TVS protection. |
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 |
|---|---|---|---|
| MAX4081TASA+ | Same 20V/V gain, but ±500µV offset (vs. ±80µV), 100kHz bandwidth (vs. 270kHz), and no VREF pins-unidirectional only. | Lacks bidirectional capability and mid-scale output option; requires external op-amp for offset adjustment in precision systems. | Select only if legacy MAX4081 footprint reuse is mandatory and bidirectionality is unnecessary. |
| INA240A1DGNR | 20V/V gain, ±20µV offset (better), but 4V–80V common-mode (wider), 105dB CMRR (lower), and 1.1MHz bandwidth (higher). | Higher bandwidth suits faster switching converters; lower CMRR may require additional filtering in noisy motor drive environments. | Prefer for ultra-low-offset requirements in new designs; verify layout immunity to EMI due to reduced CMRR margin. |
Compared with MAX4081TASA+, the LMP8481MMX-T/NOPB delivers 6× lower offset and 2.7× higher bandwidth for improved transient fidelity; versus INA240A1DGNR, it offers 19dB higher CMRR critical for high-noise automotive and industrial settings-making it optimal for precision bidirectional sensing where common-mode rejection dominates error budget.
Availability
LMP8481MMX-T/NOPB is available at Aetrix Electronics and suitable for automotive battery management, telecom power shelf supervision, and solar array string monitoring requiring stable component supply, long-term lifecycle assurance, and TI-qualified production lots.
Supply support for LMP8481MMX-T/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 and embedded processing technologies, with over 50 years of innovation in precision signal conditioning and power management ICs.
The LMP8481MMX-T/NOPB belongs to TI's LMP848x family of high-voltage current sense amplifiers-designed specifically for accurate, isolated, high-bandwidth current measurement in automotive, industrial, and telecom power systems where supply simplicity and common-mode resilience are critical.
FAQ
What is the maximum common-mode voltage the LMP8481MMX-T/NOPB can handle?
The LMP8481MMX-T/NOPB supports a common-mode input voltage range of 4.0V to 76V, with absolute maximum ratings up to 85V on RSP and RSN pins. This allows direct connection to 48V telecom rails and 72V EV battery systems without attenuation or isolation-provided the minimum 4.0V above ground is maintained for valid operation.
Can the LMP8481MMX-T/NOPB be used for bidirectional current sensing?
Yes-the LMP8481MMX-T/NOPB supports true bidirectional sensing via its dual VREFA and VREFB pins. When configured with appropriate reference voltages (e.g., VREFA = VCC, VREFB = GND), the output centers at VCC/2, enabling positive current to increase output voltage and negative current to decrease it-ideal for battery charge/discharge monitoring in LMP8481MMX-T/NOPB-based systems.
What is the purpose of the REFA and REFB pins on the LMP8481MMX-T/NOPB?
The REFA and REFB pins form an internal resistor divider network that sets the output zero-reference voltage. Their average determines the output offset: equal voltages yield 1:1 reference translation; unequal voltages produce the arithmetic mean. This enables flexible configurations-including ground-referenced (both pins grounded), mid-scale (VREFA = VCC, VREFB = GND), or externally biased outputs-without external components in LMP8481MMX-T/NOPB designs.
Does the LMP8481MMX-T/NOPB require an external power supply separate from the monitored rail?
No-the LMP8481MMX-T/NOPB operates from 4.5V to 76V and can be powered directly from the same high-voltage rail being monitored (e.g., 48V bus). Its supply voltage range overlaps its common-mode input range, eliminating the need for auxiliary bias supplies and reducing system complexity, board space, and component count in LMP8481MMX-T/NOPB implementations.
How does the LMP8481MMX-T/NOPB achieve high accuracy over temperature?
The LMP8481MMX-T/NOPB achieves ±0.8% total gain error and ±900µV offset over –40°C to +125°C through laser-trimmed thin-film resistors, matched input transistor pairs, and an internal 14V LDO that stabilizes bias conditions. Its ±6µV/°C offset drift ensures minimal calibration drift in automotive under-hood environments-key to long-term reliability in LMP8481MMX-T/NOPB deployments.
LMP8481MMX-T/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-T/NOPB FAQ
1.How can I place an order for LMP8481MMX-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481MMX-T/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-T/NOPB reliable?
The price and inventory of LMP8481MMX-T/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-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8481MMX-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481MMX-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481MMX-T/NOPB?
LMP8481MMX-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481MMX-T/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-T/NOPB?
For technical support, including LMP8481MMX-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481MMX-T/NOPB requirements.
6.How does Aetrix verify that LMP8481MMX-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8481MMX-T/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-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8481MMX-T/NOPB?
All LMP8481MMX-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481MMX-T/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-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8481MMX-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8481MMX-T/NOPB Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
