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Texas Instruments LMP8481MM-S/NOPB
- Part No.:
- LMP8481MM-S/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481MM-S/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMP8481MM-S/NOPB from Texas Instruments is a precision bidirectional high-side current sense amplifier with fixed 60V/V gain, 4.0V–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 LMP8481MM-S/NOPB datasheet, LMP8481MM-S/NOPB pinout, LMP8481MM-S/NOPB application, or LMP8481MM-S/NOPB equivalent, key selection criteria include bidirectional sensing capability, reference voltage configurability (VREFA/VREFB), wide supply compatibility (4.5V–76V), low quiescent current (<100µA), and VSSOP-8 package suitability for space-constrained high-voltage PCB layouts.
Technical Context
The LMP8481MM-S/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′, where VREF′ = (VREFA + VREFB)/2.
Unlike unidirectional LMP8480 variants, the LMP8481MM-S/NOPB supports true bidirectional current measurement via externally configurable reference inputs (VREFA/VREFB), enabling zero-centered output at GND, VCC/2, or external mid-scale references-critical for regenerative braking, H-bridge motor control, and dual-supply energy monitoring systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60V/V fixed-enables accurate current measurement with 222mV max differential input at full temperature range. |
| Common-mode range | 4.0V to 76V-supports direct connection to high-side bus without level-shifting or auxiliary supplies. |
| Input offset voltage | ±80µV typical-permits use of smaller, lower-power shunt resistors while maintaining <0.1% error at low currents. |
| Bandwidth | 270kHz (–3dB)-sufficient for real-time monitoring of PWM-driven loads and fast transient detection. |
| Supply voltage | 4.5V to 76V-allows single-supply operation from same rail as monitored load, eliminating isolated bias supplies. |
| Output drive | >5mA sourcing/sinking-directly interfaces with ADC inputs, comparators, or analog controllers without external buffers. |
| PSRR / CMRR | 122dB / 124dB DC-rejects supply noise and common-mode transients in noisy automotive or industrial environments. |
Pinout & Package
The LMP8481MM-S/NOPB is housed in an 8-pin VSSOP package (3.00mm × 3.00mm, 0.65mm pitch), optimized for thermal performance (RθJA = 185°C/W) and high-voltage PCB layout with creepage/clearance compliance.
| 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 relative to GND. |
| 2 - VCC | Positive supply voltage | Accepts 4.5V–76V supply; powers internal 14V LDO and signal chain independently of common-mode voltage. |
| 3 - NC | No connection | Not internally bonded-must remain floating per TI design; no PCB trace or thermal pad required. |
| 4 - GND | Ground reference | System ground return for supply and output; minimum 4.0V common-mode headroom required for valid operation. |
| 5 - VOUT | Voltage output | Buffered rail-to-rail capable output (min 3mV, max VCC – 230mV); drives 100kΩ loads with <0.001% load regulation. |
| 6 - REFB | Reference voltage B input | One half of differential reference divider; sets output zero point when paired with VREFA (e.g., VREF′ = (VREFA + VREFB)/2). |
| 7 - REFA | Reference voltage A input | Second reference input; enables mid-scale bias (e.g., tie to VCC for VCC/2 zero point) or external ADC reference alignment. |
| 8 - RSN | Negative current sense input | Connects to low-side of shunt resistor; forms differential pair with RSP for bidirectional polarity detection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing support | Configurable zero-reference output via dual VREF pins enables current direction detection in H-bridges and battery charge/discharge systems. |
| Wide common-mode and supply overlap | 4.0V–76V common-mode and 4.5V–76V supply ranges allow direct monitoring of 12V–48V automotive or 48V telecom buses using same supply rail. |
| High-accuracy fixed gain | ±0.1% gain accuracy and ±80µV offset ensure <0.3% total error over –40°C to +125°C without calibration. |
| Low quiescent current | <100µA supply current enables always-on current monitoring in battery-backed or energy-harvesting applications. |
| Robust ESD protection | ±2000V HBM rating ensures reliability during board assembly and field handling in industrial environments. |
Applications
| Automotive Battery Monitoring | Telecom Power System Feedback |
|---|---|
Use Scenario: Real-time bidirectional current tracking in 12V/48V vehicle battery management systems during engine start, regenerative braking, and accessory load switching. IC Role / Device Role / Timing Role: High-side current sense amplifier providing voltage-output representation of battery charge/discharge current with polarity indication. Use Value: Enables precise state-of-charge estimation and fault detection (e.g., short-circuit, parasitic drain) using only one shunt resistor and no isolated supplies. | Use Scenario: Monitoring output current of 48V DC-DC converters in telecom base stations to enforce current limits and detect open/short faults. IC Role / Device Role / Timing Role: Precision current sense front-end feeding analog-to-digital converter in power system manager ICs. Use Value: Delivers 270kHz bandwidth and 124dB CMRR to reject switching noise from adjacent buck converters while maintaining sub-millivolt offset stability. |
| H-Bridge Motor Control | Solar Inverter DC-Link Monitoring |
Use Scenario: Bidirectional current sensing across H-bridge phase legs in industrial servo drives to implement torque control and overcurrent shutdown. IC Role / Device Role / Timing Role: High-side current amplifier with user-configurable zero-reference output for direction-sensitive current feedback. Use Value: VREFA/VREFB pins allow setting output zero at VCC/2, enabling single-supply ADC sampling of both forward and reverse motor current with full dynamic range. | Use Scenario: Measuring DC-link current in string inverters to detect ground faults, module mismatch, or partial shading effects before MPPT stage. IC Role / Device Role / Timing Role: High-voltage common-mode current sensor interfacing with isolation amplifiers or sigma-delta ADCs. Use Value: 76V common-mode rating and ±80µV offset support accurate low-current detection (<100mA) across large shunts while rejecting PV array common-mode transients. |
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+ | 60V/V gain, ±100µV offset, 200kHz bandwidth, SO-8 package; lacks VREF configuration flexibility-fixed ground-referenced output. | Unidirectional-only sensing; unsuitable for bidirectional or mid-scale referenced designs without external level-shifting circuitry. | Select when cost sensitivity outweighs need for bidirectional capability and reference programmability. |
| INA240A1QDRQ1 | 20V/V gain, ±20µV offset, 400kHz bandwidth, SO-8 package; AEC-Q100 qualified, integrated EMI filtering, but requires external reference for bidirectional use. | Automotive-grade qualification and higher bandwidth, but fixed 20× gain limits resolution on low-VSENSE shunts unless cascaded. | Select for automotive safety-critical systems requiring AEC-Q100 and higher speed, accepting gain inflexibility and added external components. |
Compared with MAX4081TASA+ and INA240A1QDRQ1, the LMP8481MM-S/NOPB uniquely combines factory-trimmed 60× gain, dual VREF configurability for true bidirectional zero-centering, and 76V common-mode tolerance in a single VSSOP-8 device-reducing BOM count and layout complexity in multi-range power monitoring systems.
Availability
LMP8481MM-S/NOPB is available at Aetrix Electronics and suitable for automotive battery management, telecom power supervision, and industrial motor control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LMP8481MM-S/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 delivering analog, embedded processing, and connectivity solutions with deep expertise in precision signal chain design and high-reliability manufacturing.
The LMP8481MM-S/NOPB belongs to TI's LMP848x precision current sense amplifier family, engineered specifically for high-voltage, high-accuracy bidirectional current monitoring in automotive, industrial, and communications infrastructure where supply simplicity and measurement integrity are critical.
FAQ
What is the maximum common-mode voltage the LMP8481MM-S/NOPB can handle?
The LMP8481MM-S/NOPB supports a common-mode input voltage range of 4.0V to 76V. Its absolute maximum rating allows up to 85V on RSP or RSN pins relative to GND. This enables direct integration into 48V automotive and telecom systems without external level-shifting circuitry. The LMP8481MM-S/NOPB maintains specified performance-including ±80µV offset and 124dB CMRR-across the full 4.0V–76V operating range.
How does the LMP8481MM-S/NOPB achieve bidirectional current sensing?
The LMP8481MM-S/NOPB achieves bidirectional sensing through its dual reference inputs (VREFA and VREFB), which set the output zero point as VREF′ = (VREFA + VREFB)/2. When VREFA = VCC and VREFB = GND, the output centers at VCC/2-allowing positive and negative VSENSE to produce above/below-mid-scale outputs. This eliminates need for external op-amps or level shifters. The LMP8481MM-S/NOPB's internal architecture preserves polarity information inherently, unlike unidirectional alternatives such as the LMP8480.
Can the LMP8481MM-S/NOPB operate from the same supply as the monitored load?
Yes-the LMP8481MM-S/NOPB accepts supply voltages from 4.5V to 76V, fully overlapping its 4.0V–76V common-mode input range. This allows it to be powered directly from the load's high-side bus (e.g., 12V starter battery or 48V telecom rail), eliminating auxiliary bias supplies and reducing component count. The internal 14V LDO isolates the signal chain from supply ripple, ensuring stable operation even when VCC varies within spec.
What is the purpose of the NC pins (3, 6, and 7) on the LMP8481MM-S/NOPB?
Pin 3 is a true no-connect-unbonded and must remain floating. Pins 6 (REFB) and 7 (REFA) are functional reference inputs specific to the LMP8481MM-S/NOPB; they are not NC. Confusion may arise because LMP8480 variants list these as NC, but for LMP8481MM-S/NOPB, both REFA and REFB are active, configurable inputs that determine output zero-reference voltage. Leaving them unconnected violates recommended operating conditions and disables bidirectional functionality.
Does the LMP8481MM-S/NOPB require external compensation or filtering?
The LMP8481MM-S/NOPB is internally compensated for unity-gain stability and specifies a maximum output capacitive load of 500pF without oscillation. A 0.1µF bypass capacitor on VCC is mandatory per TI layout guidelines. External RC filters are optional and used only for anti-aliasing before ADCs-not for stability. The LMP8481MM-S/NOPB's 270kHz bandwidth and 1V/µs slew rate support clean pulse response without added phase lag, making external compensation unnecessary in standard high-side sensing configurations.
LMP8481MM-S/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-S/NOPB FAQ
1.How can I place an order for LMP8481MM-S/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481MM-S/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-S/NOPB reliable?
The price and inventory of LMP8481MM-S/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-S/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8481MM-S/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481MM-S/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481MM-S/NOPB?
LMP8481MM-S/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481MM-S/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-S/NOPB?
For technical support, including LMP8481MM-S/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481MM-S/NOPB requirements.
6.How does Aetrix verify that LMP8481MM-S/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8481MM-S/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-S/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8481MM-S/NOPB?
All LMP8481MM-S/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481MM-S/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-S/NOPB part is unused and in its original packaging.
Return procedure for LMP8481MM-S/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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