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Texas Instruments LMP8278QMM/NOPB
- Part No.:
- LMP8278QMM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8278QMM/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:432
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Product details
Overview
LMP8278QMM/NOPB from Texas Instruments is an automotive-grade, high common-mode precision current sensing amplifier with fixed 14× gain, −2 V to +40 V input common-mode voltage range, ±2 mV max input offset voltage, and operation from a single 4.5–5.5 V supply. It enables accurate unidirectional current measurement in high-side or low-side configurations for battery management, power steering, and transmission control systems.
For engineers reviewing the LMP8278QMM/NOPB datasheet, LMP8278QMM/NOPB pinout, LMP8278QMM/NOPB application, or LMP8278QMM/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification, 80 dB min DC CMRR, 90 kHz bandwidth, 0.7 V/μs slew rate, and dual-stage internal architecture enabling external filter insertion between A1 and A2 pins.
Technical Context
The LMP8278QMM/NOPB implements a proprietary level-shift input stage with 100 kΩ internal resistors, enabling robust operation at common-mode voltages beyond its 5 V supply rails. Its two-stage signal path-7× preamplifier (A1 output) followed by 2× output buffer (A2 to OUT)-allows precise gain stability (±0.5% over −2 V to +28 V VCM) and configurable filtering.
It delivers rail-to-rail output swing (4.75–4.99 V VOH, 7–30 mV VOL depending on load), supports switched capacitive loads via external RC buffering, and maintains ±15 μV/°C max TCVOS across −40°C to +125°C ambient. The VSSOP-8 package requires conformal coating for reliable operation above 25 V common-mode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Gain | 14× (±0.5% over −2 V to +28 V VCM; ensures full-scale ADC drive without calibration) |
| Input CMVR | −2 V to +40 V (supports high-side sensing with negative transients and low-side sensing with freewheeling diode recovery) |
| CMRR | ≥80 dB DC, ≥90 dB at 1 kHz (rejects noise from PWM-driven inductive loads) |
| Bandwidth | 90 kHz (enables real-time current monitoring in motor control loops up to ~10 kHz) |
| Supply Current | 0.3–0.55 mA (ultra-low quiescent power for always-on automotive subsystems) |
| Input Offset Drift | ±15 μV/°C max (minimizes temperature-induced error in battery shunt measurements) |
| PSRR | 70–80 dB (maintains accuracy despite 4.5–5.5 V supply ripple) |
Pinout & Package
Package: 8-pin VSSOP (DGK0008A), 2.3 mm × 2.0 mm body, 0.5 mm pitch. Requires conformal coating for VCM > 25 V per TI recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Differential input (negative) | Connects to low side of shunt resistor; accepts −12 V to +50 V absolute voltage |
| 2 (GND) | Power ground reference | System ground return for supply and output; decoupling capacitor must connect here |
| 3 (A1) | Preamplifier output | 7× gain node; used for external filter insertion or gain adjustment networks |
| 4 (A2) | Output buffer input | Accepts filtered or modified A1 signal; internal 100 kΩ resistor sets gain scaling |
| 5 (OUT) | Single-ended output | 14× total gain output; drives ADC inputs directly with 4.75–4.99 V VOH into 10 kΩ |
| 6 (N/C) | No-connect terminal | Must remain floating; no internal connection or function |
| 7 (VS) | Positive supply | 4.5–5.5 V single supply; requires 0.1 μF ceramic bypass to GND, placed adjacent to pin |
| 8 (+IN) | Differential input (positive) | Connects to high side of shunt resistor; same absolute voltage rating as −IN |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation in automotive powertrain and chassis systems |
| Two-stage internal architecture | Enables user-inserted RC or Sallen-Key filters between A1 and A2 for tailored anti-aliasing |
| Proprietary level-shift input | Withstands fault conditions up to ±50 V differential input without damage |
| Rail-to-rail output capability | Delivers 4.75 V VOH into 10 kΩ load, maximizing dynamic range for 5 V ADCs |
| Low thermal drift performance | ±15 μV/°C max TCVOS ensures <1 mV total offset shift across full automotive temperature range |
Applications
| Automotive Battery Management | Electric Power Steering (EPS) |
|---|---|
|
Use Scenario: Monitoring charge/discharge current in 12 V lead-acid or 48 V Li-ion battery packs with high common-mode transients during load dump or cold-crank events. IC Role / Device Role / Timing Role: High-side current sensor interfacing to MCU ADC, providing real-time current data for state-of-charge estimation and overcurrent protection. Use Value: −2 V to +40 V CMVR and 80 dB CMRR reject alternator ripple and ignition noise, ensuring <0.5% gain error under EMI stress. |
Use Scenario: Measuring motor phase current in brushless EPS motors during rapid torque transients and PWM commutation. IC Role / Device Role / Timing Role: Low-side shunt amplifier feeding closed-loop torque control algorithm with 90 kHz bandwidth and 0.7 V/μs slew rate. Use Value: 14× fixed gain scales typical 50 mV shunt voltage to 0.7 V, matching 12-bit ADC full scale and eliminating gain calibration overhead. |
| Transmission Control Unit (TCU) | RF Power Amplifier Bias Control |
|
Use Scenario: Sensing solenoid coil current in automatic transmission valve bodies during gear shifts with fast 12 V battery dips and load dump spikes. IC Role / Device Role / Timing Role: High common-mode current monitor placed between solenoid driver and ground, delivering isolated analog feedback to TCU microcontroller. Use Value: ±2 mV max VOS and ±15 μV/°C drift ensure <2% current measurement error across −40°C to +125°C, critical for shift timing accuracy. |
Use Scenario: Monitoring supply current of GaN-based RF power amplifiers operating at 24 V with fast transient response requirements. IC Role / Device Role / Timing Role: High-side current sensor placed between PA drain supply and 24 V rail, enabling real-time bias current regulation and thermal derating. Use Value: Operation up to +40 V VCM allows direct placement on high-voltage rail without level-shifting circuitry, reducing BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision current sensing amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Bi-directional sensing, 20× gain, 85 dB min CMRR, wider VCM (−4 V to +80 V), higher quiescent current (1.8 mA) | Supports regenerative braking current reversal; better suited for bidirectional motor control than unidirectional LMP8278QMM/NOPB | Select INA240A1QDRQ1 when bidirectional sensing or extended common-mode range is required; LMP8278QMM/NOPB remains optimal for cost-sensitive unidirectional applications with tighter drift specs. |
| MAX40010FAUA+ | Unidirectional, 20× gain, 100 dB CMRR, lower offset (±125 μV), but narrower VCM (0 V to +65 V), not AEC-Q100 qualified | Higher precision for industrial test equipment; lacks automotive qualification and fails below 0 V common mode | Choose MAX40010FAUA+ for lab-grade accuracy where AEC-Q100 is unnecessary; LMP8278QMM/NOPB provides guaranteed automotive reliability and sub-zero VCM support. |
Compared with INA240A1QDRQ1 and MAX40010FAUA+, the LMP8278QMM/NOPB offers the lowest input offset drift (±15 μV/°C) and unique −2 V to +40 V common-mode range among AEC-Q100 Grade 1 amplifiers, making it ideal for automotive systems requiring robustness at ground-referenced or negative transient conditions.
Availability
LMP8278QMM/NOPB is available at Aetrix Electronics and suitable for automotive battery management, electric power steering, and transmission control applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LMP8278QMM/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 automotive IC design expertise and rigorous manufacturing validation.
The LMP8278QMM/NOPB belongs to TI's Linear Monolithic Precision (LMP™) family, engineered specifically for high-accuracy, high-reliability unidirectional current sensing in automotive powertrain and chassis systems.
FAQ
What is the maximum common-mode voltage the LMP8278QMM/NOPB can handle while maintaining 80 dB CMRR?
The LMP8278QMM/NOPB maintains ≥80 dB DC CMRR over an input common-mode voltage range of −2 V to +40 V. Within −2 V to +28 V, gain accuracy is ±0.5%; above +28 V up to +40 V, specifications are relaxed but CMRR remains ≥80 dB. This enables reliable operation in high-side configurations with freewheeling diode recovery or load-dump transients.
Can the LMP8278QMM/NOPB be used for bidirectional current sensing?
No, the LMP8278QMM/NOPB is designed exclusively for unidirectional current sensing. Its internal architecture, gain topology, and specified input offset behavior assume current flow in one direction only. For bidirectional applications, TI recommends the INA240A1QDRQ1 or similar bi-directional current sense amplifiers.
How does the A1 and A2 pin interface enable external filtering in the LMP8278QMM/NOPB?
The A1 pin outputs the 7× preamplified signal; the A2 pin feeds that signal into the 2× output buffer. By inserting an RC network or Sallen-Key filter between A1 and A2, designers can add custom low-pass filtering without affecting the preamplifier stage. TI provides exact design equations for second-order Butterworth, Bessel, or critically damped responses using these pins.
Is conformal coating required for the LMP8278QMM/NOPB in all applications?
Conformal coating is strongly advised when the LMP8278QMM/NOPB operates with input common-mode voltage >25 V due to the narrow 0.5 mm pitch of the VSSOP-8 package. TI explicitly states this in the datasheet to prevent field-induced leakage or arcing. Below 25 V VCM, coating is optional but recommended for harsh automotive environments.
What is the purpose of the N/C pin (Pin 6) on the LMP8278QMM/NOPB?
Pin 6 is a true no-connect terminal with no internal bond wire or silicon connection. It must remain electrically floating-neither tied to GND nor VS-and should not be soldered to any PCB trace or plane. Leaving it unconnected prevents unintended coupling or parasitic paths that could degrade CMRR or noise performance.
LMP8278QMM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMP®
- 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:
- 0.7V/µs
- Gain Bandwidth Product:
- 90 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 400µA
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMP8278QMM/NOPB FAQ
1.How can I place an order for LMP8278QMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8278QMM/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 LMP8278QMM/NOPB reliable?
The price and inventory of LMP8278QMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8278QMM/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8278QMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8278QMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8278QMM/NOPB?
LMP8278QMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8278QMM/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 LMP8278QMM/NOPB?
For technical support, including LMP8278QMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8278QMM/NOPB requirements.
6.How does Aetrix verify that LMP8278QMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8278QMM/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 LMP8278QMM/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8278QMM/NOPB?
All LMP8278QMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8278QMM/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 LMP8278QMM/NOPB part is unused and in its original packaging.
Return procedure for LMP8278QMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8278QMM/NOPB Tags
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