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Texas Instruments LMP8645MKX/NOPB
- Part No.:
- LMP8645MKX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8645MKX/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,763
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Product details
Overview
LMP8645MKX/NOPB from Texas Instruments is a precision high-side current sense amplifier designed for accurate DC current monitoring in high common-mode voltage environments. It features a –2 V to 42 V input common-mode range, 200 μA/V transconductance, 1 mV max input offset voltage, and gain configurable via a single external resistor with ≤2% accuracy. It is used in battery monitoring, motor control, and industrial power management systems where signal integrity and temperature stability are critical.
For engineers reviewing the LMP8645MKX/NOPB datasheet, LMP8645MKX/NOPB pinout, LMP8645MKX/NOPB application, or LMP8645MKX/NOPB equivalent, this device supports precise high-side sensing in automotive and industrial DC systems with supply voltages from 2.7 V to 12 V, CMRR of 95 dB, PSRR of 90 dB, and operation across –40°C to 125°C.
Technical Context
The LMP8645MKX/NOPB implements a transconductance-based current-sense architecture: differential input voltage (VSENSE) across a shunt resistor generates a proportional output current (IS′), which develops a voltage across an external gain resistor (RG). The internal RIN resistors (5 kΩ nominal) and fixed Gm = 200 μA/V define the core gain relationship G = RG / RIN.
Its functional design enables operation with input common-mode voltage exceeding the supply rail (e.g., VCM > V+), supported by internal MOSFET-switched RIN networks that disconnect during power-off. Gain selection is constrained by VCM-dependent headroom limits-three distinct VCM ranges govern allowable RG values to prevent output saturation or RG pin overvoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-Mode Range | –2 V to 42 V - enables direct sensing on high-side bus lines up to 42 V, including negative rail tolerance for transient protection. |
| Transconductance (Gm) | 200 μA/V - defines linear current-to-voltage conversion gain baseline; sets RIN = 5 kΩ (1/Gm) for gain calculation. |
| Input Offset Voltage | ±1 mV max at 25°C - contributes ≤0.1% error at 1 V output; drift ≤1.7 mV over –40°C to 125°C. |
| CMRR | 95 dB (2.1 V < VCM < 42 V) - rejects common-mode noise in noisy power rails; drops to 60 dB below 2 V VCM. |
| PSRR | 90 dB - maintains output accuracy despite supply ripple; critical for battery-powered or unregulated DC systems. |
| Supply Current | 380–765 μA (2.7–12 V, 25°C) - low quiescent draw supports always-on monitoring without significant system power penalty. |
| Bandwidth | 260 kHz (RG = 25 kΩ) - sufficient for motor control loop feedback and battery charge/discharge rate tracking. |
Pinout & Package
Package: SOT-23-6 (DD package), body size 1.60 mm × 2.90 mm, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Output | Single-ended buffered voltage output; drives ADC inputs or microcontroller analog pins with ≤30 pF load. |
| V− | Negative Supply | Ground reference for internal circuitry; must be connected to system ground or lowest potential node. |
| +IN | Positive Input | High-impedance input tied to shunt resistor high side; accepts common-mode voltages up to 42 V. |
| −IN | Negative Input | High-impedance input tied to shunt resistor low side; differential pair with +IN senses VSENSE. |
| RG | Gain Resistor Terminal | High-impedance node connecting external gain resistor (RG); sets gain G = RG / 5 kΩ; sensitive to stray capacitance. |
| V+ | Positive Supply | Power input (2.7–12 V); supplies internal bias and output buffer; independent of input common-mode voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Gain via Single Resistor | Gain range 1× to 100× set by one external RG; eliminates need for multiple fixed-gain variants or digital calibration. |
| High Common-Mode Input Tolerance | Operates with inputs up to 42 V while powered from as low as 2.7 V - enables compact high-side sensing without level-shifting. |
| Low Input Offset Drift | 7 μV/°C typical TCVOS - ensures stable current measurement accuracy across automotive and industrial temperature ranges. |
| Robust Power-Off Input Handling | Accepts full –2 V to 42 V common-mode range with V+ = 0 V; internal MOSFET disconnects RIN, limiting input leakage to sub-μA. |
| Integrated Output Buffer | Drives capacitive loads ≤30 pF directly - simplifies interface to SAR ADCs and eliminates external op-amp buffers. |
Applications
| Battery Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Real-time monitoring of charge/discharge current in 12 V–48 V battery packs for UPS, EV auxiliary systems, or portable medical devices. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to buffered analog output for MCU ADC sampling. Use Value: Enables accurate state-of-charge estimation and overcurrent protection with ±1 mV offset and 95 dB CMRR rejecting pack-level noise. |
Use Scenario: Closed-loop current regulation in brushed DC or BLDC motor drivers operating from 24 V–40 V DC bus. IC Role / Device Role / Timing Role: High-bandwidth (260 kHz) current feedback sensor placed on high-side leg of H-bridge or inverter stage. Use Value: Supports fast current loop response with 0.5 V/μs slew rate and minimal phase lag, improving torque control fidelity. |
| Industrial Power Supply Monitoring | Automotive Load Diagnostics |
|
Use Scenario: In-rail current verification in programmable DC power supplies and PLC I/O modules requiring ±0.5% measurement accuracy. IC Role / Device Role / Timing Role: Precision current monitor interfacing with isolated ADC or digital isolator for safety-critical reporting. Use Value: Delivers 2% max gain error (including RG tolerance) and 90 dB PSRR to maintain accuracy amid switching regulator ripple. |
Use Scenario: Smart fuse and load switch diagnostics in 12 V vehicle subsystems (e.g., lighting, HVAC, ADAS sensors). IC Role / Device Role / Timing Role: High-side current sensor detecting open-circuit, short-circuit, and inrush events for ECU fault logging. Use Value: Operates reliably at –40°C to 125°C with sub-μA off-state leakage, enabling cold-cranking and under-hood deployment. |
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 |
|---|---|---|---|
| INA240A1QDRQ1 | Fixed gain (20×), wider common-mode (–4 V to 80 V), higher bandwidth (1.1 MHz), AEC-Q100 qualified. | Better suited for automotive safety-critical motor control; lacks gain flexibility and has higher quiescent current (2.4 mA). | Select when AEC-Q100 compliance and higher speed are required, and fixed gain is acceptable. |
| MAX4080TASA+ | Fixed gain (20×/60×/100×), 76 V common-mode, rail-to-rail output, lower offset (±500 μV), no external RG pin. | Preferred for space-constrained designs needing guaranteed gain accuracy without resistor layout sensitivity. | Choose when board area is limited and external resistor placement or tolerance-induced gain error must be avoided. |
Compared with INA240A1QDRQ1 and MAX4080TASA+, the LMP8645MKX/NOPB offers unique configurability via RG while maintaining low offset and wide temperature range-but requires careful RG selection per VCM range and lacks automotive qualification.
Availability
LMP8645MKX/NOPB is available at Aetrix Electronics and suitable for battery monitoring, motor control feedback, and industrial power supply monitoring requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature extremes.
Supply support for LMP8645MKX/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 power management ICs.
The LMP8645MKX/NOPB belongs to TI's precision current sense amplifier product line, engineered for high-accuracy, high-common-mode DC current measurement in industrial, automotive, and energy systems where reliability and thermal stability are essential.
FAQ
What is the maximum common-mode voltage supported by the LMP8645MKX/NOPB?
The LMP8645MKX/NOPB supports a common-mode input voltage range of –2 V to 42 V. This allows it to accurately sense current on high-side power rails up to 42 V while operating from a low 2.7 V supply. The LMP8645HV variant extends this to 76 V, but the LMP8645MKX/NOPB is specifically rated for 42 V maximum.
How is gain configured on the LMP8645MKX/NOPB?
Gain on the LMP8645MKX/NOPB is set using a single external resistor (RG) connected between the RG pin and ground. The gain is calculated as G = RG / 5 kΩ, where 5 kΩ is the nominal value of the internal RIN resistors. Gain accuracy is ≤2% maximum, including resistor tolerance and temperature effects.
Can the LMP8645MKX/NOPB operate with the supply powered off?
Yes - the LMP8645MKX/NOPB allows full common-mode voltage (–2 V to 42 V) to be applied to +IN and −IN even when V+ = 0 V. Internal MOSFETs disconnect the RIN network, limiting input leakage to sub-microamp levels. However, the differential input voltage must not exceed ±6 V at any time.
What is the output drive capability of the LMP8645MKX/NOPB?
The LMP8645MKX/NOPB provides a buffered single-ended output capable of sourcing or sinking up to 5 mA. It is specified to drive capacitive loads ≤30 pF directly - sufficient for most SAR ADC inputs. For heavier loads or noise-sensitive applications, an external RC filter may be added at VOUT, but capacitance must not be placed on the RG pin.
Does the LMP8645MKX/NOPB require external compensation?
No external compensation is required for standard operation. The LMP8645MKX/NOPB is internally compensated and stable with capacitive loads up to 30 pF. Bandwidth varies with RG value (e.g., 260 kHz at RG = 25 kΩ), and gain-vs-frequency plots in the datasheet confirm stability across the full operating range.
LMP8645MKX/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:
- 0.6V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 860 kHz
- Current - Input Bias:
- 13 µA
- Voltage - Input Offset:
- 1.7 mV
- Current - Supply:
- 2.2mA
- Current - Output / Channel:
- 5 mA
- 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
LMP8645MKX/NOPB FAQ
1.How can I place an order for LMP8645MKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8645MKX/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 LMP8645MKX/NOPB reliable?
The price and inventory of LMP8645MKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8645MKX/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8645MKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8645MKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8645MKX/NOPB?
LMP8645MKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8645MKX/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 LMP8645MKX/NOPB?
For technical support, including LMP8645MKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8645MKX/NOPB requirements.
6.How does Aetrix verify that LMP8645MKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8645MKX/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 LMP8645MKX/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8645MKX/NOPB?
All LMP8645MKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8645MKX/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 LMP8645MKX/NOPB part is unused and in its original packaging.
Return procedure for LMP8645MKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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