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Texas Instruments LMP8481MME-T/NOPB
- Part No.:
- LMP8481MME-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481MME-T/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,332
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Product details
Overview
LMP8481MME-T/NOPB from Texas Instruments is a precision bidirectional high-side current sense amplifier with fixed 20V/V gain, 4.0–76V common-mode input range, ±80µV offset, 270kHz bandwidth, and buffered 5mA output drive-used in vehicle battery monitoring, telecom power supplies, and motor control feedback loops.
For engineers reviewing the LMP8481MME-T/NOPB datasheet, LMP8481MME-T/NOPB pinout, LMP8481MME-T/NOPB application, or LMP8481MME-T/NOPB equivalent, this page delivers verified specifications, VSSOP-8 pin functions, real-world use cases, and validated alternative options for high-voltage, high-accuracy current sensing designs.
Technical Context
The LMP8481MME-T/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 fixed 20× gain and sums in user-defined reference voltage via REFA/REFB pins.
Its independent 4.5–76V supply and 4.0–76V common-mode ranges allow direct powering from the monitored rail-eliminating auxiliary supplies-and its bidirectional capability enables zero-centered output via external reference configuration, unlike unidirectional LMP8480 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 20V/V - enables direct scaling of 100mV sense voltage to 2V output for ADC interfacing without external gain stages. |
| Input Offset Voltage | ±80µV max at 25°C - supports accurate low-current measurement down to ~5mA with 20mΩ shunt, minimizing system error. |
| Common-Mode Range | 4.0V to 76V - allows direct placement on high-side of 12V/24V/48V automotive or telecom rails without level-shifting circuitry. |
| Bandwidth | 270kHz (–3dB) - captures fast transient load changes in motor commutation or DC-DC converter current limiting. |
| Supply Voltage Range | 4.5V to 76V - matches monitored rail voltage, enabling single-supply operation and eliminating isolated bias supplies. |
| Output Drive | >5mA sourcing/sinking - directly drives 10kΩ ADC inputs or long traces without buffer amplifiers. |
| CMRR / PSRR | 124dB / 122dB (DC) - rejects noise from high-dv/dt switching nodes and supply ripple in noisy industrial environments. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, base station power modules, and industrial motor drives. |
Pinout & Package
The LMP8481MME-T/NOPB is housed in an 8-pin VSSOP package (3.00mm × 3.00mm), optimized for space-constrained PCB layouts in high-density power systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RSP | Positive current sense input | Connects to high-side of shunt resistor; withstands up to 76V common-mode voltage relative to GND. |
| 2 - VCC | Positive supply voltage | Accepts 4.5–76V; powers internal LDO and amplifier stages-can be tied to monitored rail. |
| 3 - NC | No connection | Not internally bonded; must remain floating per TI design guidelines. |
| 4 - GND | Ground reference | Return path for supply and output; requires low-impedance Kelvin connection to shunt ground. |
| 5 - VOUT | Voltage output | Buffered, rail-to-rail capable output delivering 20×(VRSP–VRSN) + VREF'; drives ≥5mA. |
| 6 - REFB | Reference voltage B input | One leg of internal 100kΩ divider; sets output zero point when paired with REFA (e.g., ground or VCC). |
| 7 - REFA | Reference voltage A input | Second leg of internal 100kΩ divider; average of REFA/REFB defines VREF' offset added to gain-scaled output. |
| 8 - RSN | Negative current sense input | Connects to low-side of shunt; maintains >4.0V above GND for valid operation-no low-side sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing support | REFA/REFB pins enable zero-centered output for both charge and discharge current measurement in battery systems. |
| Integrated 14V LDO | Stabilizes internal analog core across full 4.5–76V supply range-ensures consistent offset and gain performance regardless of input rail variation. |
| High CMRR & PSRR | 124dB CMRR and 122dB PSRR suppress interference from adjacent high-power switching circuits and supply noise. |
| Low quiescent current | <100µA ICC - enables always-on current monitoring in energy-sensitive applications like solar MPPT controllers. |
| Wide temperature stability | ±900µV max offset drift over –40°C to +125°C - maintains accuracy in engine bay or outdoor telecom enclosures. |
| Robust ESD protection | ±2000V HBM - survives handling and board-level transients without latch-up or parametric shift. |
Applications
| Automotive Battery Monitoring | Telecom Power Supply Sensing |
|---|---|
Use Scenario: Real-time bidirectional current monitoring of 12V/48V vehicle battery during regenerative braking and starter load events. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to amplified, referenced output for microcontroller ADC sampling. Use Value: Enables precise state-of-charge estimation and fault detection using ±80µV offset and 270kHz bandwidth to capture rapid transients. | Use Scenario: Accurate output current measurement in 48V intermediate bus converters feeding server PSUs in data centers. IC Role / Device Role / Timing Role: High-side current sensor providing isolated, high-CMRR feedback signal to digital power controller. Use Value: Delivers 124dB CMRR and 4.0–76V common-mode range to reject noise from adjacent high-frequency switching stages. |
| Motor Control Feedback | Solar Panel String Monitoring |
Use Scenario: Phase current sensing in BLDC motor drives where high dv/dt and ground bounce preclude low-side solutions. IC Role / Device Role / Timing Role: Bidirectional high-side amplifier generating zero-referenced output for PWM-complementary current reconstruction. Use Value: REFA/REFB configuration enables mid-scale ADC alignment; 20V/V gain scales typical 50mV shunt drops to 1V full-scale. | Use Scenario: String-level current monitoring in photovoltaic combiner boxes exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Precision current sense amplifier operating directly from PV string voltage (up to 76V) with minimal external components. Use Value: –40°C to +125°C rating and <100µA quiescent current ensure reliable, low-power operation in uncooled outdoor enclosures. |
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 max offset (vs. ±80µV), lower 110dB CMRR, no REFA/REFB pins-unidirectional only. | Lacks bidirectional capability and reference flexibility; suitable only for unidirectional, less-accurate applications. | Select MAX4081TASA+ only if legacy pin compatibility is required and ±500µV offset meets system error budget. |
| INA240A1QDRQ1 | 20V/V gain, ±100µV offset, 120dB CMRR, wider –40°C to +150°C rating, but requires separate 3.3V/5V supply-not rail-powered. | Needs auxiliary supply; better temp range but higher BOM count and layout complexity in high-voltage rails. | Choose INA240A1QDRQ1 when junction temperature exceeds 125°C or when AEC-Q100 qualification is mandatory. |
Compared with MAX4081TASA+, LMP8481MME-T/NOPB delivers 6× lower offset and true bidirectionality; versus INA240A1QDRQ1, it eliminates auxiliary supply needs but trades 25°C higher max junction rating for rail-powered simplicity.
Availability
LMP8481MME-T/NOPB is available at Aetrix Electronics and suitable for automotive battery management, telecom power conversion, and industrial motor control requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LMP8481MME-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 decades of expertise in precision signal conditioning and high-reliability power management ICs.
The LMP848x family was designed specifically for high-accuracy, high-common-mode current sensing in automotive, industrial, and telecom infrastructure-emphasizing rail-powered operation, low offset, and flexible reference architecture.
FAQ
What is the maximum common-mode voltage the LMP8481MME-T/NOPB can handle?
The LMP8481MME-T/NOPB supports a common-mode input voltage range of 4.0V to 76V. This allows direct connection to high-side shunts in 48V automotive systems or telecom intermediate buses without attenuation or isolation. Operation below 4.0V is not guaranteed-the output may become invalid due to internal bias constraints.
Does the LMP8481MME-T/NOPB require an external power supply separate from the monitored rail?
No. The LMP8481MME-T/NOPB operates from 4.5V to 76V and can be powered directly from the same rail being monitored-e.g., connecting VCC to a 48V battery bus. Its supply and common-mode ranges are fully independent, eliminating the need for auxiliary regulators or isolated supplies in most high-side sensing applications.
How does the LMP8481MME-T/NOPB achieve bidirectional current sensing?
The LMP8481MME-T/NOPB achieves bidirectional sensing through its dual reference inputs (REFA and REFB). By applying appropriate voltages-such as grounding REFB and tying REFA to VCC-the output zero point shifts to VCC/2, enabling positive and negative output swings around mid-rail for both charging and discharging currents. This is intrinsic to the LMP8481 variant and not supported by the unidirectional LMP8480.
What is the purpose of the NC pins (pins 3, 6, and 7) on the LMP8481MME-T/NOPB?
Pin 3 is a true no-connect (NC) with no internal bond. Pins 6 (REFB) and 7 (REFA) are functional reference inputs specific to the LMP8481-unlike the LMP8480 where those pins are NC. Leaving REFA/REFB unconnected defaults them to internal ground, resulting in a ground-referenced unidirectional output. They must never be left floating in bidirectional configurations.
Can the LMP8481MME-T/NOPB be used for low-side current sensing?
No. The LMP8481MME-T/NOPB requires both RSP and RSN inputs to remain at least 4.0V above GND for proper operation. Attempting low-side sensing-where one input would sit near 0V-violates the minimum common-mode specification and results in invalid output behavior. It is strictly a high-side sensing device.
LMP8481MME-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
LMP8481MME-T/NOPB FAQ
1.How can I place an order for LMP8481MME-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481MME-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 LMP8481MME-T/NOPB reliable?
The price and inventory of LMP8481MME-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 LMP8481MME-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8481MME-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481MME-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481MME-T/NOPB?
LMP8481MME-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481MME-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 LMP8481MME-T/NOPB?
For technical support, including LMP8481MME-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481MME-T/NOPB requirements.
6.How does Aetrix verify that LMP8481MME-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8481MME-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 LMP8481MME-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8481MME-T/NOPB?
All LMP8481MME-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481MME-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 LMP8481MME-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8481MME-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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