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Texas Instruments LMP8481MME-H/NOPB
- Part No.:
- LMP8481MME-H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481MME-H/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:247
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Product details
Overview
LMP8481MME-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-used in automotive battery monitoring, solar panel string current sensing, and industrial motor control where accurate bidirectional load current measurement under high-voltage DC bus conditions is required.
For engineers reviewing the LMP8481MME-H/NOPB datasheet, LMP8481MME-H/NOPB pinout, LMP8481MME-H/NOPB application, or LMP8481MME-H/NOPB equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for high-side current sensing in 12–76V systems with bidirectional flow requirements.
Technical Context
The LMP8481MME-H/NOPB implements a two-stage architecture: first, a precision thin-film resistor-based voltage-to-current conversion stage referenced to internal VCM-sense resistors; second, a differential amplifier with ×5 gain and level-shifting output stage powered by an internal 14V LDO. Its 100V/V total gain is achieved via tail-resistor ratio (393.52kΩ / 19.676kΩ) plus ×5 amplification.
Unlike unidirectional variants, the LMP8481MME-H/NOPB supports true bidirectional sensing via dual reference inputs (VREFA/VREFB), enabling zero-reference configuration at GND, VCC/2, or external mid-scale voltage-critical for regenerative braking current monitoring and bidirectional DC-DC converter control where polarity reversal must be preserved without signal inversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V fixed - enables direct scaling of 13.3mV full-scale sense voltage to 1.33V output, simplifying ADC interface in 12-bit+ systems. |
| Input Offset Voltage | ±80µV max at 25°C - allows use of ≤10mΩ shunt resistors while maintaining <1% error at 1A load, reducing power loss. |
| Common-Mode Range | 4.0V to 76V - supports direct connection to 12V, 24V, 48V, and 72V battery buses without level-shifting or auxiliary supplies. |
| Bandwidth | 270kHz (–3dB) - captures fast transient currents in motor commutation and PWM-driven LED/laser drivers. |
| Output Drive | >5mA sourcing/sinking - drives 100kΩ ADC inputs or 10nF capacitive loads directly, eliminating buffer op-amps. |
| Supply Voltage | 4.5V to 76V - permits single-supply operation from monitored rail (e.g., 48V bus powers device), removing isolated bias rails. |
| PSRR / CMRR | 122dB / 124dB (DC) - rejects supply ripple and common-mode noise in noisy automotive/industrial environments. |
Pinout & Package
Package: 8-pin VSSOP (DGK), 3.00mm × 3.00mm body size, 0.65mm pitch - compatible with standard surface-mount assembly and space-constrained PCB layouts.
| 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 supply; overlaps input common-mode range, enabling single-rail operation from monitored bus. |
| 3 NC | No connection | Not internally connected; must remain floating or grounded per layout best practices. |
| 4 GND | Ground reference | System ground return; requires low-impedance Kelvin connection to shunt resistor for accuracy. |
| 5 VOUT | Voltage output | Buffered, rail-to-rail capable output delivering >5mA; scales (VRSP–VRSN)×100 + VREF' with 1% settling in 20µs. |
| 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', enabling mid-scale or bipolar referencing. |
| 8 RSN | Negative current sense input | Connects to low-side of shunt resistor; maintains 4.0–76V common-mode tolerance and matched input impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Enables regenerative current measurement in EV traction inverters and bidirectional DC-DC converters without external polarity switching. |
| 100V/V fixed gain with ±0.6% error | Eliminates external gain-setting resistors and associated tempco drift, ensuring stable calibration over –40°C to 125°C. |
| Dual reference inputs (VREFA/VREFB) | Supports flexible zero-point configuration: GND-referenced (unidirectional), VCC/2 (mid-scale ADC), or external VREF/2 (precision analog front-end). |
| 270kHz bandwidth with 1V/µs slew rate | Accurately tracks 50kHz PWM edges in motor phase current sensing and laser driver modulation without phase lag. |
| 76V common-mode tolerance with 4.5V supply | Allows direct monitoring of 72V battery packs using only a 5V microcontroller supply, reducing BOM count and board area. |
Applications
| Automotive Battery Management | Solar Panel String Monitoring |
|---|---|
|
Use Scenario: Real-time bidirectional current measurement in 48V mild-hybrid vehicle battery packs during charge/discharge cycles and regenerative braking. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to amplified, referenced output for MCU ADC sampling at 10kHz. Use Value: ±80µV offset and 124dB CMRR ensure <0.5% current measurement error despite 12V–48V bus transients and engine cranking noise. |
Use Scenario: Monitoring individual photovoltaic string currents in commercial rooftop solar arrays to detect shading or panel failure. IC Role / Device Role / Timing Role: High-side amplifier interfacing 50mΩ shunt to 16-bit SAR ADC, operating across 40–76V string voltages. Use Value: 4.0–76V common-mode range and 100V/V gain enable direct connection to strings without isolation, reducing cost and leakage paths. |
| Industrial Motor Control | Telecom Power Shelf Monitoring |
|
Use Scenario: Phase current sensing in 3-phase BLDC motor drives for field-oriented control (FOC), requiring precise bidirectional feedback. IC Role / Device Role / Timing Role: Current sense amplifier placed on high-side of each inverter leg, feeding isolated sigma-delta modulators. Use Value: 270kHz bandwidth and 20µs settling time support accurate current reconstruction at 20kHz PWM frequencies. |
Use Scenario: Input/output current monitoring in 48V telecom rectifier shelves to enforce redundancy and detect hot-swap failures. IC Role / Device Role / Timing Role: High-side sense amplifier driving analog watchdog circuits and digital power management ICs. Use Value: Buffered 5mA output drives multiple loads (ADC, comparator, optocoupler) without external buffers, improving system reliability. |
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 - higher offset and lower bandwidth than LMP8481MME-H/NOPB. | Less suitable for precision bidirectional FOC motor control due to slower response and larger offset-induced error at low currents. | Select MAX4081HASA+ only if legacy compatibility or existing MAX408x footprint reuse is required; verify offset calibration overhead. |
| INA240A1DGNR | 100V/V gain, ±20µV offset, 400kHz bandwidth, 2.7–80V supply - superior offset and bandwidth, but requires external reference for bidirectional operation. | Requires external op-amp or DAC to generate bipolar reference; adds complexity vs. integrated VREFA/VREFB of LMP8481MME-H/NOPB. | Choose INA240A1DGNR when ultra-low offset (<±50µV) is mandatory and design can accommodate external reference circuitry. |
Compared with MAX4081HASA+, the LMP8481MME-H/NOPB delivers 2.5× lower offset and 80% higher bandwidth for tighter current-loop control; versus INA240A1DGNR, it trades 30µV offset improvement for integrated bidirectional referencing-reducing component count and layout risk in space-constrained modules.
Availability
LMP8481MME-H/NOPB is available at Aetrix Electronics and suitable for automotive battery management, solar energy monitoring, and industrial motor control requiring stable component supply across extended temperature ranges and high-voltage DC applications.
Supply support for LMP8481MME-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 and embedded processing technologies, with decades of expertise in precision signal conditioning and high-voltage interface solutions.
The LMP848x family was designed specifically for high-accuracy, high-common-mode-voltage current sensing in automotive, industrial, and renewable energy systems-emphasizing low offset, wide temperature stability, and simplified system-level integration.
FAQ
What is the maximum differential input voltage supported by the LMP8481MME-H/NOPB?
The LMP8481MME-H/NOPB supports a maximum differential input voltage (VSENSE) of 133mV at –40°C to 125°C for the H-gain version. This value is derived from the 100V/V gain and output headroom constraints, ensuring linear operation without saturation when the output remains within its specified voltage range relative to VCC and GND.
Can the LMP8481MME-H/NOPB operate with a 5V supply while monitoring a 48V bus?
Yes, the LMP8481MME-H/NOPB can operate with a 5V supply while monitoring a 48V bus. Its supply voltage range (4.5V–76V) and common-mode input range (4.0V–76V) are fully independent, allowing direct connection to high-voltage rails without intermediate regulators-reducing system complexity and improving reliability.
How does the LMP8481MME-H/NOPB achieve bidirectional current sensing?
The LMP8481MME-H/NOPB achieves bidirectional sensing through its dual reference inputs (VREFA and VREFB), which set the output zero point. When VREFA = VREFB = 2.5V, the output centers at 2.5V; positive current raises VOUT above 2.5V, negative current lowers it-enabling polarity-aware measurement without external signal inversion circuitry.
Is the LMP8481MME-H/NOPB pin-compatible with the LMP8480 series?
No, the LMP8481MME-H/NOPB is not pin-compatible with LMP8480 variants. While both use the same 8-pin VSSOP package, pins 6 and 7 are NC on LMP8480 but serve as VREFB and VREFA on LMP8481MME-H/NOPB. Interchanging them without circuit modification will result in undefined output behavior or damage.
What is the purpose of the internal 14V LDO in the LMP8481MME-H/NOPB?
The internal 14V LDO in the LMP8481MME-H/NOPB powers the core amplifier stages and output buffer independently of the main VCC supply, ensuring stable performance across the full 4.5–76V input range. It decouples analog circuitry from supply ripple, contributing to the device's 122dB PSRR and consistent offset/bandwidth specifications.
LMP8481MME-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
LMP8481MME-H/NOPB FAQ
1.How can I place an order for LMP8481MME-H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481MME-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 LMP8481MME-H/NOPB reliable?
The price and inventory of LMP8481MME-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 LMP8481MME-H/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8481MME-H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481MME-H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481MME-H/NOPB?
LMP8481MME-H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481MME-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 LMP8481MME-H/NOPB?
For technical support, including LMP8481MME-H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481MME-H/NOPB requirements.
6.How does Aetrix verify that LMP8481MME-H/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8481MME-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 LMP8481MME-H/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8481MME-H/NOPB?
All LMP8481MME-H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481MME-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 LMP8481MME-H/NOPB part is unused and in its original packaging.
Return procedure for LMP8481MME-H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8481MME-H/NOPB Tags
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