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Texas Instruments LMP8640QMKX-T/NOPB
- Part No.:
- LMP8640QMKX-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640QMKX-T/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:4,910
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Product details
Overview
LMP8640QMKX-T/NOPB from Texas Instruments is a precision high-side current sense amplifier with fixed 20 V/V gain, designed to accurately amplify small differential voltages across shunt resistors in the presence of high common-mode voltages up to +42 V and down to −2 V. It operates from a 2.7 V to 12 V single supply, delivers ±900 µV input offset voltage (typ), 0.25% max gain error, and 103 dB CMRR over 2.1 V–42 V common-mode range - enabling accurate battery monitoring and motor control current sensing in industrial and automotive systems.
For engineers reviewing the LMP8640QMKX-T/NOPB datasheet, LMP8640QMKX-T/NOPB pinout, LMP8640QMKX-T/NOPB application, or LMP8640QMKX-T/NOPB equivalent, this device is selected for high-accuracy, low-drift, high-common-mode current measurement where supply headroom is constrained, PCB space is limited to SOT-23-6, and AEC-Q100 Grade 1 qualification is required for automotive use.
Technical Context
The LMP8640QMKX-T/NOPB implements a precision current-sense topology using matched internal resistive feedback and low-input-bias-current amplifiers to maintain accuracy across wide common-mode voltage swings. Its fixed-gain architecture eliminates external resistor matching errors and ensures stable 20 V/V transfer function over temperature and supply variation.
It features a buffered rail-to-rail output stage, 5 kΩ differential input impedance, and optimized AC performance including 950 kHz bandwidth (at 20 V/V gain) and 1.8 V/µs slew rate (12 V supply), supporting both DC and transient current monitoring in power-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 20 V/V - eliminates external gain-setting resistor errors and ensures repeatable signal scaling for ADC interfacing. |
| Common-Mode Voltage Range | −2 V to +42 V - supports high-side sensing in 12 V, 24 V, and 36 V battery systems, including reverse-battery tolerant operation. |
| Input Offset Voltage | ±900 µV (typ) at 25°C - enables accurate detection of sub-10 mV sense voltages (e.g., 50 mΩ shunt @ 200 mA). |
| Gain Error | ±0.25% (max) - ensures <1 LSB error when digitizing with 12-bit ADCs over full operating temperature range. |
| CMRR | 103 dB (2.1 V–42 V) - rejects noise from noisy power rails while preserving small differential signals. |
| Supply Voltage Range | 2.7 V to 12 V - compatible with Li-ion, lead-acid, and regulated 3.3 V/5 V supplies without level-shifting. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: 6-pin Thin SOT-23 (2.9 mm × 1.6 mm), surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Amplified output voltage | Buffered, low-impedance voltage output referenced to V−; drives ADC inputs or analog controllers directly. |
| 2 - V− | Negative supply terminal | Ground reference for output stage and internal biasing; must be connected to system ground or negative rail. |
| 3 - +IN | Positive current-sense input | Connects to high-side of shunt resistor; accepts common-mode voltages up to +42 V. |
| 4 - −IN | Negative current-sense input | Connects to low-side of shunt resistor; differential input with 5 kΩ impedance per side. |
| 5 - NC | No internal connection | Unbonded pin; must remain floating - no routing or soldering required. |
| 6 - V+ | Positive supply terminal | Accepts 2.7 V–12 V single supply; powers internal amplifier and output buffer. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications with operating junction temperature up to +125°C and robust ESD tolerance (HBM ±2000 V). |
| High common-mode rejection | 103 dB CMRR over 2.1 V–42 V range ensures stable gain even during load transients on noisy 12 V/24 V rails. |
| Low input offset drift | 2.6 µV/°C TCVOS enables <±2.5 mV total offset shift across −40°C to +125°C - critical for battery SoC estimation. |
| Fixed-gain precision | 0.25% max gain error (not typical) guarantees consistent scaling without calibration in production test. |
| Wide supply compatibility | Operates down to 2.7 V - supports direct interface with low-voltage microcontrollers and battery-powered sensors. |
Applications
| Battery Management System (BMS) | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Real-time monitoring of pack-level charge/discharge current in 12 V lead-acid or 48 V mild-hybrid battery systems. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to scaled analog output for MCU ADC sampling. Use Value: Enables accurate Coulomb counting with <±0.5% full-scale current error over temperature, supporting ISO 26262 functional safety requirements. |
Use Scenario: Measuring fuel injector or ignition coil current in gasoline/diesel engine control modules. IC Role / Device Role / Timing Role: Precision current monitor providing fast-response analog feedback for closed-loop driver control and fault detection. Use Value: Delivers 950 kHz bandwidth and 1.8 V/µs slew rate to capture µs-scale current pulses, improving diagnostic resolution for misfire detection. |
| Industrial Motor Drive | Server Power Supply Monitoring |
Use Scenario: Phase current sensing in BLDC or stepper motor drivers for torque control and overcurrent protection. IC Role / Device Role / Timing Role: High-common-mode amplifier isolating shunt measurements from noisy half-bridge switching nodes. Use Value: −2 V to +42 V common-mode range accommodates high-side sensing above bus voltage, eliminating need for isolated amplifiers or optocouplers. |
Use Scenario: Input/output current monitoring in 12 V intermediate bus converters and VRMs for datacenter PSUs. IC Role / Device Role / Timing Role: Precision analog front-end for digital power management ICs requiring calibrated current telemetry. Use Value: 0.25% gain error and ±900 µV offset enable single-point calibration across production batches, reducing test time and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDGKRQ1 | 20 V/V gain, −4 V to +80 V common-mode, 50 ppm/°C gain drift, 500 kHz bandwidth | Higher common-mode range and lower drift, but larger SOIC-8 package and higher quiescent current (2.4 mA vs. 1.05 mA) | Select for >42 V rail applications (e.g., 48 V EV subsystems); avoid if SOT-23-6 footprint or ultra-low IQ is mandatory. |
| MAX4080TASA+ | 20 V/V gain, −0.1 V to +76 V common-mode, 1.5 mV max offset, 250 kHz bandwidth | Wider common-mode range and AEC-Q100 Grade 0 rating, but higher offset and lower bandwidth limit dynamic response | Select when reverse-voltage tolerance below −0.1 V is unnecessary and cost sensitivity favors Maxim's pricing; verify layout for 250 kHz settling. |
Compared with INA240A1QDGKRQ1 and MAX4080TASA+, the LMP8640QMKX-T/NOPB offers superior offset performance (±900 µV vs. ±1.5 mV) and bandwidth (950 kHz vs. 250–500 kHz) in the smallest SOT-23-6 package, making it optimal for space-constrained, high-accuracy automotive and industrial current sensing where 42 V common-mode ceiling is sufficient.
Availability
LMP8640QMKX-T/NOPB is available at Aetrix Electronics and suitable for battery monitoring, automotive ECU current sensing, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LMP8640QMKX-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 amplifiers and automotive-grade ICs.
The LMP8640 product line was engineered specifically for high-accuracy, high-common-mode current sensing in automotive and industrial power systems - emphasizing low offset, tight gain tolerance, and AEC-Q100 qualification without sacrificing bandwidth or supply flexibility.
FAQ
What is the common-mode voltage range supported by the LMP8640QMKX-T/NOPB?
The LMP8640QMKX-T/NOPB supports a common-mode voltage range of −2 V to +42 V. This allows it to perform high-side current sensing in 12 V and 24 V automotive and industrial systems, including scenarios with reverse-battery conditions. The specification is validated per AEC-Q100 Grade 1 requirements and applies across the full −40°C to +125°C operating temperature range.
Does the LMP8640QMKX-T/NOPB require external gain-setting resistors?
No, the LMP8640QMKX-T/NOPB has a factory-trimmed fixed gain of 20 V/V. Its internal precision resistive network eliminates the need for external gain-setting components, removing matching errors, temperature drift, and PCB layout sensitivity associated with discrete resistor networks - a key advantage over programmable current sense amplifiers.
What is the maximum supply voltage for the LMP8640QMKX-T/NOPB?
The absolute maximum supply voltage (V+ to V−) for the LMP8640QMKX-T/NOPB is 13.2 V, but the recommended operating range is 2.7 V to 12 V. Operation at 12 V enables full output swing (up to 11.85 V) and optimal slew rate (1.8 V/µs), while maintaining thermal stability within the SOT-23-6 package's 165°C/W junction-to-ambient rating.
How does the LMP8640QMKX-T/NOPB handle input overvoltage conditions?
The LMP8640QMKX-T/NOPB tolerates input voltages up to +60 V on +IN and −IN pins (per Absolute Maximum Ratings), with built-in ESD protection rated at ±2000 V HBM. However, sustained operation above +42 V common-mode violates the specified functional range and may degrade accuracy or reliability - design margins should keep VCM ≤ +42 V for guaranteed performance.
Is the NC pin on the LMP8640QMKX-T/NOPB required to be grounded or left floating?
Pin 5 (NC) on the LMP8640QMKX-T/NOPB is not internally connected and must remain unconnected - neither grounded nor tied to any voltage. Routing or soldering to this pin may cause mechanical stress or unintended coupling; TI's layout guidelines explicitly require leaving it floating and unmasked in the solder paste layer.
LMP8640QMKX-T/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.8V/µs
- Gain Bandwidth Product:
- 950 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 13 µA
- Voltage - Input Offset:
- 900 µV
- Current - Supply:
- 2.3mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMP8640QMKX-T/NOPB FAQ
1.How can I place an order for LMP8640QMKX-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640QMKX-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 LMP8640QMKX-T/NOPB reliable?
The price and inventory of LMP8640QMKX-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 LMP8640QMKX-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640QMKX-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640QMKX-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640QMKX-T/NOPB?
LMP8640QMKX-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640QMKX-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 LMP8640QMKX-T/NOPB?
For technical support, including LMP8640QMKX-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640QMKX-T/NOPB requirements.
6.How does Aetrix verify that LMP8640QMKX-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640QMKX-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 LMP8640QMKX-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640QMKX-T/NOPB?
All LMP8640QMKX-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640QMKX-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 LMP8640QMKX-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8640QMKX-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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