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Texas Instruments LMP8640MKX-F/NOPB
- Part No.:
- LMP8640MKX-F/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640MKX-F/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:2,971
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Product details
Overview
LMP8640MKX-F/NOPB from Texas Instruments is a precision high-side current sense amplifier with fixed 50 V/V gain, operating from 2.7 V to 12 V supply and supporting input common-mode voltages from –2 V to +42 V. It delivers ±0.25% max gain error, 900 µV max input offset voltage, and 103 dB CMRR (2.1 V–42 V), enabling accurate DC/AC current monitoring in battery-powered and industrial power rails.
For engineers reviewing the LMP8640MKX-F/NOPB datasheet, LMP8640MKX-F/NOPB pinout, LMP8640MKX-F/NOPB application, or LMP8640MKX-F/NOPB equivalent, this device is selected for high-accuracy, low-drift current sensing where supply headroom is limited, common-mode transients are present, and output loading must be minimized via buffered voltage output.
Technical Context
The LMP8640MKX-F/NOPB uses a proprietary current-sense topology with matched internal resistive feedback (RG = 2×RIN) and dual 5 kΩ differential input resistors (RIN), ensuring stable gain accuracy across temperature and supply voltage. Its rail-to-rail output buffer drives ≥1 MΩ loads while maintaining linearity over full common-mode range.
It operates as a single-supply instrumentation-grade amplifier optimized for high-side shunt measurement: the +IN and –IN inputs directly interface across the sense resistor, rejecting common-mode voltage up to 42 V while amplifying only the mV-level differential VSENSE signal with minimal offset drift (2.6 µV/°C typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 50 V/V - eliminates external gain-setting components and ensures production-ready accuracy without calibration. |
| Common-Mode Range | –2 V to +42 V - supports high-side sensing in 12 V, 24 V, and 36 V systems including battery disconnect and load-switch monitoring. |
| Max Gain Error | ±0.25% at 25°C - enables sub-1% total current measurement error in closed-loop power supplies and motor phase current sensing. |
| Input Offset Voltage | ±900 µV max - limits worst-case sensing error to ≤18 µV at 50× gain, critical for low-current (<1 A) applications with mΩ shunts. |
| CMRR | 103 dB (2.1 V–42 V) - suppresses common-mode noise from switching regulators and bus transients, preserving signal integrity. |
| Supply Voltage Range | 2.7 V to 12 V - allows direct operation from Li-ion batteries or regulated 3.3 V/5 V rails without level-shifting circuitry. |
| Bandwidth | 450 kHz - supports real-time current monitoring in PWM-driven motor controls and fast overcurrent protection circuits. |
Pinout & Package
Package: 6-pin Thin SOT-23 (2.9 mm × 1.6 mm), surface-mount, lead-free (NOPB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Amplified output | Buffered voltage output referenced to V−; drives high-impedance ADC inputs or comparator thresholds without gain degradation. |
| 2 - V− | Negative supply | Ground or negative rail reference; must be connected directly to system ground or low-side shunt node for proper common-mode rejection. |
| 3 - +IN | Positive differential input | Connects to high-side of sense resistor; accepts common-mode voltages up to +42 V while sourcing only 13 µA bias current. |
| 4 - −IN | Negative differential input | Connects to low-side of sense resistor; matched input impedance (5 kΩ) with +IN ensures balanced common-mode rejection. |
| 5 - NC | No connect | Not internally bonded; must remain unconnected and unstubbed to avoid parasitic coupling or EMI susceptibility. |
| 6 - V+ | Positive supply | Single positive supply input (2.7–12 V); powers internal amplifier and output buffer; decoupling capacitor required within 1 cm. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 50 V/V gain | Eliminates external resistor matching errors and layout sensitivity-guarantees gain accuracy without trimming or calibration. |
| 103 dB CMRR (2.1–42 V) | Maintains measurement fidelity in noisy 24 V industrial buses or automotive battery lines with fast transient suppression. |
| 900 µV max input offset | Enables accurate sub-ampere current detection using standard 10 mΩ shunts without zero-error compensation circuitry. |
| 450 kHz bandwidth | Supports dynamic current profiling in BLDC motor commutation and real-time overcurrent fault response (<2.2 µs rise time). |
| Rail-to-rail output buffer | Drives 1 MΩ loads with <1 mV error-directly interfaces with SAR ADCs (e.g., ADS8860) without external op-amp buffering. |
Applications
| Motor Phase Current Sensing | Battery Pack Protection |
|---|---|
Use Scenario: Real-time monitoring of individual phase currents in 3-phase BLDC motors for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-side current sense amplifier converting mV-level shunt voltage to clean 0–2.5 V analog signal for microcontroller ADC sampling at 100 kHz. Use Value: Enables precise torque regulation and stall detection with <1% full-scale error across –40°C to 125°C ambient. |
Use Scenario: Monitoring charge/discharge current in multi-cell Li-ion battery packs with 24 V nominal voltage. IC Role / Device Role / Timing Role: High-side sensing element feeding current data to battery management system (BMS) MCU for coulomb counting and overcurrent cutoff. Use Value: Supports ±0.5 A detection resolution using 2 mΩ shunt, with immunity to pack voltage transients up to 42 V. |
| Industrial Power Supply OCP | Server VRM Current Monitoring |
Use Scenario: Fast overcurrent protection in isolated 48 V telecom power supplies with <5 µs fault response requirement. IC Role / Device Role / Timing Role: Primary current sense stage feeding comparator input for hardware-level shutdown, bypassing digital control loop latency. Use Value: Delivers 450 kHz bandwidth and 1.6 V/µs slew rate to resolve 100 ns current spikes before damage occurs. |
Use Scenario: Per-phase current reporting in multiphase CPU/GPU voltage regulator modules (VRMs) for thermal derating and load balancing. IC Role / Device Role / Timing Role: High-accuracy analog current monitor on each VRM phase, outputting scaled voltage to PMBus ADC or dedicated current-sense IC. Use Value: Achieves ±0.3% gain error stability over temperature-critical for accurate power budgeting and phase shedding decisions. |
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 |
|---|---|---|---|
| INA240A1IDR | 20 V/V fixed gain, –4 V to 80 V common-mode, 120 kHz bandwidth, 50 µV offset | Better offset and wider common-mode range, but lower bandwidth limits use in fast-switching VRMs | Select for ultra-low-offset requirements in precision battery fuel gauging where speed is secondary |
| MAX40056ATA+T | 50 V/V fixed gain, –0.1 V to 65 V common-mode, 1 MHz bandwidth, 120 µV offset | Higher bandwidth and lower offset, but requires dual supply (±2.7 V) and lacks automotive qualification | Select for high-speed motor control where >450 kHz response is mandatory and dual supply is available |
Compared with INA240A1IDR and MAX40056ATA+T, the LMP8640MKX-F/NOPB offers optimal balance of 50× gain accuracy, 450 kHz bandwidth, and single-supply operation in 24–42 V industrial systems-making it preferred for cost-sensitive, space-constrained designs requiring no external gain components.
Availability
LMP8640MKX-F/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, battery management systems, and server power delivery requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LMP8640MKX-F/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 company specializing in analog and embedded processing solutions, with leadership in precision amplifiers, power management, and signal chain products.
The LMP8640MKX-F/NOPB belongs to TI's precision current sense amplifier product line, designed specifically for high-accuracy, high-common-mode industrial and automotive current monitoring where reliability, gain stability, and low offset are critical.
FAQ
What is the exact gain setting of the LMP8640MKX-F/NOPB?
The LMP8640MKX-F/NOPB has a factory-trimmed fixed gain of exactly 50 V/V. This value is laser-adjusted during production and guaranteed over temperature (±0.51% max error from –40°C to +125°C). No external resistors are needed-gain is set permanently by internal matched thin-film resistors (RG = 2×RIN, RIN = 5 kΩ).
Can the LMP8640MKX-F/NOPB operate with a 3.3 V supply?
Yes, the LMP8640MKX-F/NOPB operates across 2.7 V to 12 V supply range, making 3.3 V fully supported. At 3.3 V, it maintains full functionality: 50 V/V gain, –2 V to +42 V common-mode input range, and buffered rail-to-rail output swing (min 40 mV above V−, max 2.65 V below V+ at 25°C).
What does the "F" suffix indicate in LMP8640MKX-F/NOPB?
The "F" suffix in LMP8640MKX-F/NOPB denotes the 50 V/V gain variant within the LMP8640 family. TI uses "T" for 20 V/V, "F" for 50 V/V, and "H" for 100 V/V. The "MKX" package code specifies the 6-pin Thin SOT-23, and "/NOPB" confirms lead-free (RoHS-compliant) finish.
Is the NC pin on the LMP8640MKX-F/NOPB safe to tie to ground?
No-the NC (pin 5) on the LMP8640MKX-F/NOPB is not internally connected and must remain floating and unconnected. TI explicitly states it is "not internally connected"; grounding or routing traces to this pin may introduce parasitic capacitance or EMI coupling that degrades CMRR and bandwidth performance.
How does the LMP8640MKX-F/NOPB handle input overvoltage beyond its absolute maximum rating?
The LMP8640MKX-F/NOPB absolute maximum input voltage is –6 V to +60 V on +IN/–IN pins. Exceeding this risks permanent damage. It does not include integrated overvoltage protection-external clamping (e.g., TVS diodes rated ≤60 V) is required in systems subject to load dump or inductive kick events exceeding 42 V common-mode.
LMP8640MKX-F/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:
- 450 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMP8640MKX-F/NOPB FAQ
1.How can I place an order for LMP8640MKX-F/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640MKX-F/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 LMP8640MKX-F/NOPB reliable?
The price and inventory of LMP8640MKX-F/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8640MKX-F/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640MKX-F/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640MKX-F/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640MKX-F/NOPB?
LMP8640MKX-F/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640MKX-F/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 LMP8640MKX-F/NOPB?
For technical support, including LMP8640MKX-F/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640MKX-F/NOPB requirements.
6.How does Aetrix verify that LMP8640MKX-F/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640MKX-F/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 LMP8640MKX-F/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640MKX-F/NOPB?
All LMP8640MKX-F/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640MKX-F/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 LMP8640MKX-F/NOPB part is unused and in its original packaging.
Return procedure for LMP8640MKX-F/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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