My Inquiry
My Account
Texas Instruments LMP8645HVMKE/NOPB
- Part No.:
- LMP8645HVMKE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8645HVMKE/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:7,658
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMP8645HVMKE/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 supports −2 V to 76 V input common-mode range, 2.7 V to 12 V supply, 200 μA/V transconductance, 1 mV max input offset voltage, and operates across −40°C to 125°C - enabling accurate battery monitoring and motor control in automotive and industrial power rails.
For engineers reviewing the LMP8645HVMKE/NOPB datasheet, LMP8645HVMKE/NOPB pinout, LMP8645HVMKE/NOPB application, or LMP8645HVMKE/NOPB equivalent, this page delivers verified specifications, validated pin functions, confirmed HV-range operation (−2 V to 76 V), gain configuration methodology using RG, and real-world use cases in battery management and high-side current measurement where precision under extreme VCM is critical.
Technical Context
The LMP8645HVMKE/NOPB implements a transconductance-based current-sense architecture: differential input voltage (VSENSE) modulates an internal current source proportional to VSENSE/RIN, where RIN = 1/Gm = 5 kΩ (trimmed). This current flows through the external RG resistor to generate VOUT = VSENSE × (RG/RIN), delivering buffered single-ended output with low impedance.
Its functional design accommodates three VCM operating ranges (−2 V to 1.8 V; 1.8 V to VS; >VS) with distinct RG selection constraints per range to maintain output compliance and avoid saturation. Gain accuracy remains ≤±2% over temperature when using a standard ±1% external resistor, supported by 95 dB CMRR and 90 dB PSRR up to 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-Mode Input Range | −2 V to 76 V - enables direct sensing on 48 V, 60 V, and 72 V battery rails without level-shifting or isolation |
| Supply Voltage Range | 2.7 V to 12 V - compatible with 3.3 V, 5 V, and 12 V system supplies; supports wide-input DC-DC outputs |
| Transconductance (Gm) | 200 μA/V - defines internal current gain; sets RIN = 5 kΩ, forming basis for precise gain ratio G = RG/5 kΩ |
| Input Offset Voltage | ±1 mV max at 25°C - contributes ≤±0.1% error at 1 V output with 100× gain, critical for low-current accuracy |
| CMRR | 95 dB (2.1 V < VCM < 76 V) - rejects interference from noisy high-voltage bus transients in motor drives |
| PSRR | 90 dB - maintains output stability despite ripple on 12 V supply rail in automotive environments |
| Bandwidth | 260 kHz at RG = 25 kΩ - sufficient for PWM switching frequencies up to 50 kHz with margin for closed-loop response |
| Operating Temperature | −40°C to 125°C - qualified for under-hood automotive and industrial ambient conditions |
Pinout & Package
Package: SOT-23-6 (DD package), body size 1.60 mm × 2.90 mm, thermally enhanced for continuous operation at full VCM and temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Output | Single-ended buffered voltage output; drives ADC inputs or microcontroller analog pins directly (≤30 pF load) |
| V− | Negative Supply | Ground reference for internal circuitry; must be connected to system ground or negative rail |
| +IN | Positive Input | High-impedance node connected to high-side of sense resistor; accepts −2 V to 76 V common-mode |
| −IN | Negative Input | High-impedance node connected to low-side of sense resistor; differential input with 6 V max swing |
| RG | Gain Resistor Terminal | High-impedance node connecting external RG; sets gain G = RG/5 kΩ; sensitive to stray capacitance |
| V+ | Positive Supply | Power input for internal biasing; must be ≥2.7 V and ≤12 V; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Gain via Single Resistor | Gain set precisely as G = RG/5 kΩ (1× to 100×); eliminates need for multiple fixed-gain variants |
| High Common-Mode Rejection | 95 dB CMRR ensures <0.002% output error from 10 V bus ripple at 100 kHz - critical for clean measurements in noisy inverters |
| Robust Input Stage | Accepts full −2 V to 76 V VCM even with V+ = 0 V (power-off safe); Zener clamps protect against overvoltage |
| Low Output Impedance Buffer | Drives 30 pF capacitive loads directly - interfaces seamlessly with SAR ADCs without external op-amp buffering |
| Temperature-Stable Performance | Max ±1.7 mV offset drift over −40°C to 125°C; 140 ppm/°C Gm drift preserves gain accuracy across thermal cycling |
| ESD-Robust Inputs | ±5000 V HBM on +IN/−IN pins - withstands handling and board-level ESD events in production and field environments |
Applications
| Battery Monitoring | Motor Control |
|---|---|
Use Scenario: Real-time monitoring of charge/discharge current in 48 V mild-hybrid vehicle battery packs. 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 ±0.5% current accuracy across −40°C to 105°C ambient, supporting state-of-charge estimation and overcurrent protection without external level shifters. |
Use Scenario: Phase current sensing in 3-phase BLDC motor drives operating from 60 V DC bus. IC Role / Device Role / Timing Role: High-bandwidth current monitor placed on high-side leg of each inverter phase. Use Value: 260 kHz bandwidth and 0.5 V/μs slew rate support accurate current capture during 20–40 kHz PWM commutation, minimizing torque ripple. |
| Industrial Power Supplies | EV Onboard Charger (OBC) |
Use Scenario: Output current regulation and fault detection in programmable 0–30 V, 0–10 A lab power supplies. IC Role / Device Role / Timing Role: Precision current sense element feeding feedback loop of isolated DC-DC controller. Use Value: 1 mV offset and 95 dB CMRR ensure stable regulation under line transients and load steps, reducing output current error to <0.1% FS. |
Use Scenario: Input AC line current monitoring and DC link current sensing in bi-directional OBC modules. IC Role / Device Role / Timing Role: Dual-role amplifier: high-side sensing on 400 V DC link and low-side sensing on AC input rectifier output. Use Value: −2 V to 76 V VCM range covers both AC rectified (≈540 V peak → scaled) and DC link domains with single-part design reuse. |
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 max VCM; 120 kHz bandwidth; integrated EMI filtering | Better for cost-sensitive, fixed-ratio designs requiring automotive AEC-Q100 Grade 1 qualification | Select when gain stability and EMI robustness outweigh need for adjustable gain and higher bandwidth |
| MAX40010FAUA+ | Fixed gain (50 V/V); 65 V max VCM; 1.5 MHz bandwidth; rail-to-rail output | Preferred for high-speed digital power supplies needing fast transient response and 3.3 V compatibility | Select when >1 MHz bandwidth and rail-to-rail output swing are mandatory, and VCM ≤65 V suffices |
Compared with INA240A1QDRQ1 and MAX40010FAUA+, the LMP8645HVMKE/NOPB uniquely balances ultra-high VCM (76 V), user-configurable gain (1×–100×), and 260 kHz bandwidth - making it optimal for flexible, high-accuracy current sensing where supply voltage and common-mode range vary across product variants.
Availability
LMP8645HVMKE/NOPB is available at Aetrix Electronics and suitable for battery monitoring, motor control, industrial power supplies, and EV onboard charger designs requiring stable component supply across extended temperature and high common-mode voltage operation.
Supply support for LMP8645HVMKE/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 signal conditioning and power management ICs.
The LMP8645HVMKE/NOPB belongs to TI's precision current sense amplifier product line, engineered specifically for high-side sensing in automotive, industrial, and energy systems where accuracy, safety, and reliability under extreme common-mode voltages are essential.
FAQ
What is the maximum common-mode voltage supported by the LMP8645HVMKE/NOPB?
The LMP8645HVMKE/NOPB supports a maximum input common-mode voltage of 76 V, with a minimum of −2 V. This range is explicitly specified for the HV variant (LMP8645HV) and confirmed in the Absolute Maximum Ratings table and Recommended Operating Conditions section of the official datasheet. The standard LMP8645 variant is limited to 42 V, but LMP8645HVMKE/NOPB is the HV version.
How is gain configured on the LMP8645HVMKE/NOPB?
Gain on the LMP8645HVMKE/NOPB is set externally using a single resistor (RG) connected between the RG pin and ground. The gain is calculated as G = RG / 5 kΩ, where 5 kΩ is the trimmed internal RIN value derived from the 200 μA/V transconductance. For example, a 50 kΩ resistor yields 10× gain. Accuracy remains within ±2% with a ±1% tolerance resistor.
Can the LMP8645HVMKE/NOPB operate with no supply voltage applied?
Yes - the LMP8645HVMKE/NOPB allows full −2 V to 76 V common-mode voltage on +IN and −IN pins even when V+ = 0 V (unpowered). Internal MOSFET switches disconnect the RIN resistors, limiting input leakage to sub-μA levels. However, the 6 V differential limit between +IN and −IN still applies, and input Zener clamps require adherence to Absolute Maximum Ratings.
What is the output drive capability of the LMP8645HVMKE/NOPB?
The LMP8645HVMKE/NOPB features an integrated low-impedance output buffer capable of sourcing or sinking ±5 mA while maintaining linearity. It is characterized to drive up to 30 pF capacitive load directly - sufficient for most SAR ADC inputs without external buffering. Exceeding 30 pF may cause instability or reduced bandwidth, especially with long PCB traces.
Does the LMP8645HVMKE/NOPB require external compensation components?
No external compensation is required for basic operation. The LMP8645HVMKE/NOPB is internally compensated for unity-gain stability across its full gain range. However, if an RC low-pass filter is added at the output (e.g., for noise reduction before an ADC), the capacitor must not be connected to the RG pin - doing so risks instability due to the high-impedance nature of that node.
LMP8645HVMKE/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
LMP8645HVMKE/NOPB FAQ
1.How can I place an order for LMP8645HVMKE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8645HVMKE/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 LMP8645HVMKE/NOPB reliable?
The price and inventory of LMP8645HVMKE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8645HVMKE/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8645HVMKE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8645HVMKE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8645HVMKE/NOPB?
LMP8645HVMKE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8645HVMKE/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 LMP8645HVMKE/NOPB?
For technical support, including LMP8645HVMKE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8645HVMKE/NOPB requirements.
6.How does Aetrix verify that LMP8645HVMKE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8645HVMKE/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 LMP8645HVMKE/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8645HVMKE/NOPB?
All LMP8645HVMKE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8645HVMKE/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 LMP8645HVMKE/NOPB part is unused and in its original packaging.
Return procedure for LMP8645HVMKE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8645HVMKE/NOPB Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
