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Texas Instruments LMP8645HVMKX/NOPB
- Part No.:
- LMP8645HVMKX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8645HVMKX/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:2,511
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Product details
Overview
LMP8645HVMKX/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 range, 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 LMP8645HVMKX/NOPB datasheet, LMP8645HVMKX/NOPB pinout, LMP8645HVMKX/NOPB application, or LMP8645HVMKX/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support details specific to the LMP8645HVMKX/NOPB SOT-6 variant.
Technical Context
The LMP8645HVMKX/NOPB implements a transconductance-based current-sense architecture: differential input voltage (VSENSE) across a shunt resistor drives a proportional output current (IS′ = VSENSE × Gm), which develops a buffered voltage (VOUT = IS′ × RG) at the output. Its internal RIN resistors (5 kΩ nominal) are trimmed and disconnected when unpowered, enabling safe input voltage application during power-off states.
Gain is set externally via RG pin with resistor values directly determining VOUT scaling (G = RG / RIN); design constraints on RG depend on VCM range-three distinct operating zones (−2 V to 1.8 V, 1.8 V to VS, >VS) define allowable RG–VSENSE combinations to avoid exceeding VOUT limits. CMRR remains ≥95 dB across 2.1 V < VCM < 76 V, and PSRR holds at 90 dB independent of supply voltage variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-Mode Range | −2 V to 76 V - enables direct sensing on high-side bus rails up to 76 V without level-shifting or isolation. |
| Transconductance (Gm) | 200 μA/V - defines linear current-to-voltage conversion ratio; sets minimum detectable VSENSE for given output resolution. |
| Input Offset Voltage | ±1 mV max at 25°C - contributes ≤0.1% error at 1 V full-scale output; drift ≤1.7 mV over −40°C to 125°C. |
| Gain Accuracy | ±2% max with external resistor - includes tolerance of external RG; enables calibrated current measurement without trimming. |
| Supply Voltage Range | 2.7 V to 12 V - supports single-supply operation from Li-ion battery (3.0–4.2 V) up to industrial 12 V rails. |
| CMRR / PSRR | ≥95 dB / 90 dB - rejects noise coupling from high-voltage bus transients and supply ripple, preserving signal integrity. |
| Bandwidth | 260 kHz at RG = 25 kΩ - sufficient for motor control loop feedback and battery charge/discharge monitoring. |
Pinout & Package
Package: SOT-23-6 (DD package), body size 1.60 mm × 2.90 mm, thermal resistance RθJA = 96 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Output | Single-ended buffered voltage output; drives ADC inputs or microcontroller analog pins with ≤30 pF load. |
| V− (Pin 2) | Negative Supply | Ground reference for internal circuitry; must be connected to system ground or negative rail. |
| +IN (Pin 3) | Positive Input | High-impedance input tied to high-side shunt terminal; accepts −2 V to 76 V common-mode voltage. |
| −IN (Pin 4) | Negative Input | High-impedance input tied to low-side shunt terminal; differential input range limited to ±6 V. |
| RG (Pin 5) | Gain Resistor Terminal | High-impedance node connecting external gain-setting resistor; determines output gain G = RG / 5 kΩ. |
| V+ (Pin 6) | Positive Supply | Power input for internal circuitry; supplies bias current and output buffer; range 2.7 V to 12 V. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Gain via Single Resistor | Gain ranges 1× to 100× using external RG; eliminates need for multiple fixed-gain variants or digital calibration. |
| Input Bias Current | 12 μA typical - minimizes voltage drop error across high-value shunt resistors used in low-current sensing. |
| Power-Supply Rejection | 90 dB - ensures stable output despite ripple on 12 V supply rails common in automotive and industrial environments. |
| Safe Input Application During Power-Off | Inputs tolerate full −2 V to 76 V common-mode range with V+ = 0 V; internal MOSFET disconnects RIN, limiting leakage to sub-μA. |
| Output Drive Capability | ±5 mA sourcing/sinking - directly interfaces with SAR ADC reference buffers or MCU analog inputs without external op-amp. |
Applications
| Battery Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Real-time monitoring of charge/discharge current in 48 V EV auxiliary battery packs or UPS systems. 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 precise state-of-charge estimation and overcurrent protection with 1 mV offset and 76 V common-mode capability. |
Use Scenario: Closed-loop current regulation in BLDC motor inverters with 60 V DC bus. IC Role / Device Role / Timing Role: High-bandwidth (260 kHz) current sensor feeding analog input of motor control MCU for PWM cycle-by-cycle current limiting. Use Value: Maintains ≥95 dB CMRR at 60 V VCM to reject switching noise from gate drivers and IGBTs. |
| Vehicle Electrical System Diagnostics | Industrial Power Supply Monitoring |
|
Use Scenario: Detecting parasitic drain and fuse integrity in 12 V/24 V automotive subsystems (e.g., infotainment, ADAS ECUs). IC Role / Device Role / Timing Role: Always-on current monitor with power-off input tolerance, interfacing to low-power microcontroller wake-up logic. Use Value: Sub-μA input leakage when unpowered allows continuous shunt monitoring without battery depletion. |
Use Scenario: Output current verification in programmable DC power supplies delivering up to 72 V. IC Role / Device Role / Timing Role: Precision analog front-end for digital power controller, providing isolated current feedback via ADC. Use Value: 2% gain accuracy with external resistor eliminates factory calibration while supporting wide dynamic range (100 mV–600 mV VSENSE). |
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×), wider common-mode (−4 V to 80 V), lower offset (±20 μV), AEC-Q100 qualified. | Requires no external resistor; better for automotive safety-critical systems but less flexible for variable gain needs. | Select when AEC-Q100 compliance and ultra-low offset outweigh need for adjustable gain. |
| MAX40016AUB+ | Fixed gain (50×), higher bandwidth (1.5 MHz), rail-to-rail output, 2.7 V to 5.5 V supply only. | Optimized for fast transient response in telecom power modules; incompatible with 12 V supply or >5.5 V rails. | Select when >1 MHz bandwidth and rail-to-rail output are required, and supply is limited to ≤5.5 V. |
Compared with LMP8645HVMKX/NOPB, INA240A1QDRQ1 offers automotive qualification and lower offset but sacrifices gain flexibility, while MAX40016AUB+ delivers higher speed and rail-to-rail output but restricts supply voltage and lacks high-VCM headroom beyond 5.5 V.
Availability
LMP8645HVMKX/NOPB is available at Aetrix Electronics and suitable for battery monitoring, motor control feedback, and vehicle electrical diagnostics requiring stable component supply across automotive, industrial, and energy storage programs.
Supply support for LMP8645HVMKX/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 amplifiers and power management ICs.
The LMP8645HV product line targets high-reliability current sensing in high-common-mode-voltage environments such as automotive battery systems, industrial motor drives, and renewable energy inverters.
FAQ
What is the maximum common-mode voltage supported by the LMP8645HVMKX/NOPB?
The LMP8645HVMKX/NOPB supports a maximum input common-mode voltage of 76 V, with a minimum of −2 V. This specification is explicitly defined for the HV variant in the datasheet's Features and Description sections and validated across all operating conditions including temperature extremes. The standard LMP8645 variant is rated only to 42 V, confirming that the HV suffix denotes this extended range. This enables direct connection to 48 V and 60 V bus systems without attenuation or isolation.
How is gain configured on the LMP8645HVMKX/NOPB?
Gain on the LMP8645HVMKX/NOPB is configured using a single external resistor connected between the RG pin (Pin 5) and ground. The gain is calculated as G = RG / RIN, where RIN is the internally trimmed 5 kΩ resistor pair. Datasheet Section 7.4.1 confirms this method, and Table 6-5 shows gain settings from 1× to 100× achievable with RG values from 5 kΩ to 500 kΩ. Maximum gain accuracy is ±2%, including resistor tolerance and temperature drift.
Can the LMP8645HVMKX/NOPB be used with no supply voltage applied?
Yes - the LMP8645HVMKX/NOPB allows full −2 V to 76 V common-mode voltage to be applied to +IN and −IN pins even when V+ = 0 V. Section 7.3.2 of the datasheet states that internal MOSFETs disconnect the RIN resistors during power-off, limiting input leakage to sub-μA. However, the ±6 V differential limit between +IN and −IN still applies, and input Zener clamps require adherence to Absolute Maximum Ratings to prevent damage.
What is the output drive capability of the LMP8645HVMKX/NOPB?
The LMP8645HVMKX/NOPB provides ±5 mA output sourcing and sinking capability, as specified in Sections 6.5–6.7 under "IOUT". This allows direct interface with typical ADC input buffers (e.g., SAR or sigma-delta converters) and microcontroller analog inputs without external buffering. The buffered output maintains low impedance across temperature and supply variations, ensuring stable signal transfer into capacitive loads up to 30 pF.
Does the LMP8645HVMKX/NOPB require external compensation components?
No - the LMP8645HVMKX/NOPB is internally compensated and stable with capacitive loads up to 30 pF, as confirmed in Section 6.5–6.7 "CLOAD" and Figure 6-7 through 6-12. External RC filtering is optional for noise reduction but must not connect capacitance to the RG pin due to its high impedance. Layout guidelines in Section 10 emphasize short traces and local decoupling, but no external compensation network is required for basic operation.
LMP8645HVMKX/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
LMP8645HVMKX/NOPB FAQ
1.How can I place an order for LMP8645HVMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8645HVMKX/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 LMP8645HVMKX/NOPB reliable?
The price and inventory of LMP8645HVMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8645HVMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8645HVMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8645HVMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8645HVMKX/NOPB?
LMP8645HVMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8645HVMKX/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 LMP8645HVMKX/NOPB?
For technical support, including LMP8645HVMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8645HVMKX/NOPB requirements.
6.How does Aetrix verify that LMP8645HVMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8645HVMKX/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 LMP8645HVMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8645HVMKX/NOPB?
All LMP8645HVMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8645HVMKX/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 LMP8645HVMKX/NOPB part is unused and in its original packaging.
Return procedure for LMP8645HVMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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