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Texas Instruments LMP8645HVMK/NOPB
- Part No.:
- LMP8645HVMK/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8645HVMK/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,524
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Product details
Overview
LMP8645HVMK/NOPB from Texas Instruments is a precision high-voltage current sense amplifier designed for high-side sensing in systems with demanding common-mode voltage requirements. It operates from 2.7 V to 12 V, supports −2 V to 76 V input common-mode voltage, delivers 200 μA/V transconductance, achieves ≤2% maximum gain accuracy with external resistor, and features 1 mV input offset voltage over −40°C to 125°C. It is used in battery monitoring and motor control where accurate DC/AC current measurement under high-voltage bias is critical.
For engineers reviewing the LMP8645HVMK/NOPB datasheet, LMP8645HVMK/NOPB pinout, LMP8645HVMK/NOPB application, or LMP8645HVMK/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed high-voltage sensing specifications, and real-world implementation constraints - including RG-resistor-dependent gain limits, CMRR degradation below 2 V common-mode, and output drive capability into 30 pF loads.
Technical Context
The LMP8645HVMK/NOPB uses a transconductance-based architecture: differential input voltage across +IN/−IN develops a proportional output current (IS′ = VSENSE × Gm), which flows through the external RG resistor to generate VOUT = VSENSE × (RG / RIN). Its internal RIN resistors are trimmed to 5 kΩ nominal, yielding fixed transconductance of 200 μA/V.
Gain configuration requires strict adherence to three VCM-dependent ranges: for VCM > VS, output swing is limited by VOUT(max) per supply voltage (e.g., 10.2 V at 12 V supply); for −2 V ≤ VCM ≤ 1.8 V, VRG must stay ≤1.3 V; for 1.8 V < VCM ≤ VS, VRG ≤ (VCM − VSENSE − 250 mV). These constraints directly govern allowable RG values and usable VSENSE range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-Mode Voltage Range | −2 V to 76 V - enables direct sensing on battery strings, 48 V industrial rails, and automotive 12 V/24 V systems with negative ground tolerance. |
| Transconductance (Gm) | 200 μA/V - defines fixed gain scaling between input differential voltage and output current; sets baseline for external RG-based gain calibration. |
| Input Offset Voltage | ±1 mV max at 25°C - contributes ≤1% error at 100 mV full-scale sense voltage; drift ≤1.7 mV over −40°C to 125°C. |
| Gain Accuracy | ±2% max with external RG - includes resistor tolerance and internal RIN matching; enables calibrated current measurement without trimming. |
| CMRR | 95 dB (2.1 V < VCM < 76 V) - suppresses common-mode noise in high-noise environments like motor drives and power converters. |
| Supply Current | 555–765 μA at 12 V, 25°C - scales with VCM and supply voltage; increases to 2.9 mA at VCM = −2 V, requiring thermal-aware layout. |
| Output Drive | 5 mA sourcing/sinking into RL ≥ 1 MΩ - sufficient to drive ADC inputs directly; limited to 30 pF capacitive load to maintain stability. |
Pinout & Package
Package: SOT-23-6 (DD package), body size 1.60 mm × 2.90 mm, JEDEC MO-178 variant. Thermal resistance RθJA = 96°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Single-ended analog output | Buffered voltage output proportional to sensed current; requires ≤30 pF load capacitance for stability. |
| V− (Pin 2) | Negative supply rail | Ground reference for internal circuitry; must be connected to system ground or negative rail; supports −2 V common-mode input. |
| +IN (Pin 3) | Positive differential input | Connects to high-side of sense resistor; withstands up to 80 V absolute max (LMP8645HV). |
| −IN (Pin 4) | Negative differential input | Connects to low-side of sense resistor; Zener-clamped to ground; differential limit ±6 V enforced. |
| RG (Pin 5) | External gain resistor connection | High-impedance node; connects one end of RG; sensitive to stray capacitance - no RC filters permitted here. |
| V+ (Pin 6) | Positive supply rail | Accepts 2.7 V to 12 V; powers internal amplifier and output buffer; PSRR = 90 dB ensures supply noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable gain via single external resistor | Enables precise current-to-voltage conversion across 1× to 100× gain range while maintaining ≤2% total error including resistor tolerance. |
| High common-mode rejection at AC frequencies | CMRR remains ≥95 dB up to 10 kHz and ≥70 dB at 100 kHz - critical for PWM-based motor control and switching power supply current monitoring. |
| Robust input stage with power-off tolerance | Accepts full −2 V to 76 V common-mode range even when V+ = 0 V; internal MOSFET disconnects RIN, limiting leakage to sub-μA. |
| Low output impedance buffered output | Drives ADC inputs directly without external op-amp buffer; eliminates gain error and phase shift introduced by passive RC filtering at output. |
| Stable operation with defined capacitive load limit | Guaranteed stability with ≤30 pF load; prevents oscillation when interfacing to SAR or sigma-delta ADCs with sampling capacitors. |
Applications
| Battery Monitoring | Motor Control |
|---|---|
|
Use Scenario: Real-time monitoring of charge/discharge current in 48 V Li-ion battery packs for UPS and energy storage systems. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to buffered analog output for microcontroller ADC sampling. Use Value: Enables accurate state-of-charge estimation and overcurrent protection with 76 V common-mode tolerance and minimal offset drift over temperature. |
Use Scenario: Phase current sensing in three-phase BLDC motor drives operating from 24 V to 48 V DC bus. IC Role / Device Role / Timing Role: Precision current amplifier placed on high-side leg to capture fast-switching current waveforms without ground loop interference. Use Value: Delivers 95 dB CMRR and 0.6 V/µs slew rate to resolve PWM-edge transients while rejecting bus noise during commutation. |
| Vehicle Current Measurement | Power Management |
|
Use Scenario: In-vehicle 12 V/24 V system current monitoring for load diagnostics, fuseless protection, and ECU power budgeting. IC Role / Device Role / Timing Role: High-side sense amplifier interfaced to vehicle MCU for periodic current logging and anomaly detection. Use Value: Supports −2 V reverse-battery tolerance and operates down to −40°C, meeting automotive cold-crank and load-dump immunity requirements. |
Use Scenario: Input current supervision in isolated DC/DC converters and server VRMs to detect overloads and short circuits. IC Role / Device Role / Timing Role: Primary-side current monitor providing feedback to digital power controller via analog voltage output. Use Value: Maintains 2% gain accuracy across 2.7–12 V supply range and 125°C junction temperature, ensuring consistent trip thresholds under varying line conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Fixed gain (20 V/V), 80 V common-mode, 50 kHz bandwidth, integrated EMI filter; no external RG required. | Better suited for cost-sensitive automotive applications needing AEC-Q100 qualification and reduced BOM count. | Select INA240A1QDRQ1 when fixed-gain simplicity, automotive qualification, and EMI robustness outweigh programmable gain flexibility. |
| MAX40056ATA+T | 76 V common-mode, 100 kHz bandwidth, 0.5 µV/°C offset drift, 1.5 mV max offset; requires external gain resistor but offers lower drift. | Preferred for precision industrial test equipment requiring ultra-low offset drift and tighter initial accuracy. | Select MAX40056ATA+T when long-term DC stability and sub-1.5 mV offset over temperature are prioritized over TI ecosystem support. |
Compared with LMP8645HVMK/NOPB, INA240A1QDRQ1 eliminates gain-setting complexity but sacrifices configurability, while MAX40056ATA+T improves offset stability at the cost of higher unit price and non-TI supply chain. LMP8645HVMK/NOPB remains optimal for designs requiring field-tunable gain and broad supply voltage compatibility (2.7–12 V) within TI's qualified portfolio.
Availability
LMP8645HVMK/NOPB is available at Aetrix Electronics and suitable for battery monitoring, motor control, and vehicle current measurement requiring stable component supply across industrial and automotive production lifecycles.
Supply support for LMP8645HVMK/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 technologies, with leadership in precision signal conditioning and power management ICs.
The LMP8645 family was developed for high-accuracy, high-common-mode current sensing in battery-powered, automotive, and industrial systems where space-constrained SOT-23 packaging and resistor-programmable gain are essential design requirements.
FAQ
What is the maximum common-mode voltage supported by the LMP8645HVMK/NOPB?
The LMP8645HVMK/NOPB supports an input common-mode voltage range of −2 V to 76 V. This specification is explicitly validated for the HV variant (LMP8645HV) and confirmed in Absolute Maximum Ratings (80 V absolute max on +IN/−IN pins). Operation beyond 76 V common-mode violates recommended conditions and risks parametric degradation.
Can the LMP8645HVMK/NOPB operate with no supply voltage applied?
Yes - the LMP8645HVMK/NOPB allows full −2 V to 76 V common-mode voltage on +IN and −IN pins even when V+ = 0 V. Internal MOSFETs disconnect the RIN resistors, limiting input leakage to sub-μA. However, the ±6 V differential limit between +IN and −IN remains strictly enforced regardless of supply state.
How does gain selection work on the LMP8645HVMK/NOPB?
Gain is set by an external resistor (RG) connected between Pin 5 (RG) and ground. The gain equals RG / RIN, where RIN is trimmed to 5 kΩ (yielding Gm = 200 μA/V). Valid RG values depend on VCM range: for VCM > VS, RG ≤ (VOUT(max) × RIN) / VSENSE(max); detailed constraints are provided in Sections 7.4.2.1–7.4.2.3 of the datasheet.
What is the output drive capability of the LMP8645HVMK/NOPB?
The LMP8645HVMK/NOPB delivers ±5 mA output current into RL ≥ 1 MΩ and maintains stability with ≤30 pF capacitive load. Exceeding 30 pF may cause peaking or oscillation. It is optimized to drive ADC inputs directly without external buffering, supporting typical SAR and sigma-delta converter sampling networks.
Does the LMP8645HVMK/NOPB require external compensation components?
No external compensation is required for basic operation. The LMP8645HVMK/NOPB is internally compensated for unity-gain stability with ≤30 pF load. Adding RC filtering at the output is permissible, but connecting capacitance to the RG pin is prohibited due to its high impedance and sensitivity to phase margin degradation.
LMP8645HVMK/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
LMP8645HVMK/NOPB FAQ
1.How can I place an order for LMP8645HVMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8645HVMK/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 LMP8645HVMK/NOPB reliable?
The price and inventory of LMP8645HVMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8645HVMK/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8645HVMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8645HVMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8645HVMK/NOPB?
LMP8645HVMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8645HVMK/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 LMP8645HVMK/NOPB?
For technical support, including LMP8645HVMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8645HVMK/NOPB requirements.
6.How does Aetrix verify that LMP8645HVMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8645HVMK/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 LMP8645HVMK/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8645HVMK/NOPB?
All LMP8645HVMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8645HVMK/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 LMP8645HVMK/NOPB part is unused and in its original packaging.
Return procedure for LMP8645HVMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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