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Texas Instruments LMP8481MM-T/NOPB
- Part No.:
- LMP8481MM-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481MM-T/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:603
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Product details
Overview
LMP8481MM-T/NOPB from Texas Instruments is a precision bidirectional high-side current sense amplifier with 20V/V fixed gain, 76V common-mode input range (4.0–76V), ±80µV max input 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 LMP8481MM-T/NOPB datasheet, LMP8481MM-T/NOPB pinout, LMP8481MM-T/NOPB application, or LMP8481MM-T/NOPB equivalent, key selection criteria include bidirectional sensing capability, reference-input flexibility (VREFA/VREFB), 124dB DC CMRR, –40°C to 125°C operation, and VSSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LMP8481MM-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 delivers gain × VSENSE + VREF′. 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 LMP8481MM-T/NOPB supports true bidirectional current measurement via externally configurable VREFA and VREFB pins, allowing zero-reference setting at GND, VCC/2, or external mid-scale references-critical for motor control regeneration and battery charge/discharge detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed-enables precise scaling of small shunt voltages (e.g., 50mV → 1V output) without external gain-setting components. |
| Input Offset Voltage | ±80µV max at 25°C-supports use of low-value, low-power shunt resistors (e.g., 1mΩ) while maintaining <0.5% error at 1A full-scale. |
| Common-Mode Range | 4.0V to 76V-allows direct placement on high-side bus rails up to 76V without level-shifting circuitry or auxiliary supplies. |
| Bandwidth | 270kHz (–3dB)-sufficient for fast transient detection in motor phase current or DC-DC converter overcurrent protection. |
| Output Drive | >5mA sourcing/sinking-drives ADC inputs, optocouplers, or comparator thresholds directly without buffer amplifiers. |
| 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 drive applications. |
Pinout & Package
VSSOP-8 package (3.00mm × 3.00mm), thermally enhanced, surface-mountable with exposed thermal pad (DGK suffix). Compatible with standard 0.65mm pitch reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RSP | Positive current sense input | High-impedance input connected to high-side of shunt resistor; withstands up to 85V absolute max. |
| 2 - VCC | Positive supply voltage | Accepts 4.5–76V supply-can be tied to monitored rail, eliminating isolated bias supply. |
| 3 - NC | No connection | Not internally bonded; must remain floating per TI design guidelines. |
| 4 - GND | Ground reference | Analog ground return; requires low-inductance connection to system ground plane. |
| 5 - VOUT | Voltage output | Buffered rail-to-rail capable output; drives ≥5mA into 10kΩ loads with <1% linearity error. |
| 6 - REFB | Reference voltage "B" input | One leg of internal 100kΩ divider; sets output zero point when paired with VREFA (e.g., GND or VCC). |
| 7 - REFA | Reference voltage "A" input | Second leg of internal 100kΩ divider; average of REFA/REFB defines VREF′ offset added to gain×VSENSE. |
| 8 - RSN | Negative current sense input | High-impedance input connected to low-side of shunt; common-mode rejection optimized vs. RSP. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing support | Configurable zero-reference via dual VREF pins enables current direction detection in battery charge/discharge and motor regen. |
| Supply-common-mode independence | VCC can be ≤, =, or ≥ monitored rail voltage-e.g., 5V supply monitoring 76V bus-reducing BOM count and layout complexity. |
| Low quiescent current | <100µA typical-enables always-on current monitoring in energy-sensitive systems like solar microinverters. |
| High DC accuracy | ±0.1% gain accuracy and ±80µV offset ensure <0.3% total unadjusted error across –40°C to 125°C in precision power metering. |
| Robust ESD rating | ±2000V HBM-meets automotive and industrial handling requirements without additional protection circuitry. |
Applications
| Automotive Battery Management | Telecom Power Monitoring |
|---|---|
|
Use Scenario: Real-time monitoring of 12V/48V battery pack charge/discharge current in ADAS ECUs and gateway modules. IC Role / Device Role / Timing Role: High-side current sense amplifier converting mV-level shunt voltage to calibrated analog output for MCU ADC sampling. Use Value: Enables SOC estimation, fuseless overcurrent protection, and thermal derating using same shunt for bidirectional flow-no polarity-switching circuitry required. |
Use Scenario: Continuous current supervision of +48V DC distribution in 5G base station power shelves. IC Role / Device Role / Timing Role: Precision analog front-end delivering stable, noise-immune current telemetry to PMBus controllers. Use Value: 124dB CMRR rejects switching noise from adjacent DC-DC converters; 270kHz bandwidth captures load transients for predictive fault detection. |
| Motor Control Feedback | Solar Panel String Monitoring |
|
Use Scenario: Phase current sensing in BLDC inverter half-bridges operating up to 76V bus voltage. IC Role / Device Role / Timing Role: Bidirectional high-side amplifier providing isolated current feedback to gate driver ICs or MCU PWM capture units. Use Value: VREFA/REFB configuration allows mid-rail zero reference synchronized with ADC's VREF, enabling single-supply 12-bit resolution across ±50A range. |
Use Scenario: Per-string current measurement in commercial rooftop PV arrays with 60–76V open-circuit voltage. IC Role / Device Role / Timing Role: High-voltage-tolerant current sensor interfacing shunt outputs to isolated data acquisition nodes. Use Value: 4.0V minimum common-mode enables operation even during partial shading or startup; ±80µV offset minimizes error at low irradiance (<200W/m²). |
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 (6× higher), no VREF pins-unidirectional only, 100kHz bandwidth. | Lacks bidirectional capability and reference flexibility; suitable only for simple high-side overload detection. | Choose MAX4081TASA+ only if cost sensitivity outweighs accuracy and functionality needs in non-bidirectional apps. |
| INA240A1DGNR | 20V/V gain, ±20µV offset (superior), but 4V–80V common-mode, no VREF pins, 4-pin VSSOP-unidirectional only. | Higher accuracy and wider common-mode, but no bidirectional zero-reference option; requires external op-amp for bipolar output. | Select INA240A1DGNR when ultra-low offset dominates requirements and bidirectionality is handled elsewhere in signal chain. |
Compared with MAX4081TASA+ and INA240A1DGNR, the LMP8481MM-T/NOPB uniquely combines bidirectional sensing, programmable reference offset, and automotive-grade temperature performance in a single VSSOP-8 device-making it optimal where direction-aware current telemetry and board-space efficiency are critical.
Availability
LMP8481MM-T/NOPB is available at Aetrix Electronics and suitable for automotive battery management, telecom power monitoring, and motor control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LMP8481MM-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, embedded processing, and connectivity technologies, with decades of expertise in precision signal conditioning and power management ICs.
The LMP8481MM-T/NOPB belongs to TI's LMP848x precision current sense amplifier family-engineered specifically for high-voltage, high-accuracy bidirectional current measurement in automotive, industrial, and communications infrastructure.
FAQ
What is the maximum common-mode voltage the LMP8481MM-T/NOPB can handle?
The LMP8481MM-T/NOPB supports a common-mode input voltage range of 4.0V to 76V, with absolute maximum ratings up to 85V on RSP/RSN pins. This enables direct integration into 48V automotive systems and telecom +48V distribution without attenuation or isolation-critical for maintaining signal integrity and minimizing measurement error.
Does the LMP8481MM-T/NOPB support bidirectional current sensing?
Yes, the LMP8481MM-T/NOPB natively supports bidirectional current 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, allowing positive and negative VSENSE to produce above- and below-midpoint outputs-essential for battery charge/discharge and motor regenerative braking detection.
What is the purpose of the REFA and REFB pins on the LMP8481MM-T/NOPB?
The REFA and REFB pins on the LMP8481MM-T/NOPB form an internal resistor divider network that sets the output zero-reference voltage (VREF′). Their average determines the DC offset added to the amplified VSENSE signal-enabling flexible configurations such as ground-referenced (both grounded), mid-rail (VREFA = VCC, VREFB = GND), or external mid-scale (e.g., ADC reference) outputs without external components.
Can the LMP8481MM-T/NOPB operate with a supply voltage lower than the monitored rail?
Yes-the LMP8481MM-T/NOPB operates with supply voltage (VCC) independent of common-mode voltage. It functions correctly with VCC = 5V while monitoring a 76V rail, eliminating need for auxiliary supplies. This is enabled by its internal 14V LDO and input-stage architecture, reducing system complexity and PCB area in high-voltage applications.
What package type is used for the LMP8481MM-T/NOPB?
The LMP8481MM-T/NOPB uses an 8-pin VSSOP (DGK) package measuring 3.00mm × 3.00mm with exposed thermal pad. This compact, surface-mount outline supports high-density layouts and provides superior thermal performance versus SOIC-verified in TI's thermal metrics (RθJA = 185°C/W) for sustained operation at 125°C ambient.
LMP8481MM-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
LMP8481MM-T/NOPB FAQ
1.How can I place an order for LMP8481MM-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481MM-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 LMP8481MM-T/NOPB reliable?
The price and inventory of LMP8481MM-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 LMP8481MM-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8481MM-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481MM-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481MM-T/NOPB?
LMP8481MM-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481MM-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 LMP8481MM-T/NOPB?
For technical support, including LMP8481MM-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481MM-T/NOPB requirements.
6.How does Aetrix verify that LMP8481MM-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8481MM-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 LMP8481MM-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8481MM-T/NOPB?
All LMP8481MM-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481MM-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 LMP8481MM-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8481MM-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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