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Texas Instruments LMP8646MK/NOPB
- Part No.:
- LMP8646MK/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8646MK/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,869
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Product details
Overview
LMP8646MK/NOPB from Texas Instruments is a precision current limiter IC designed for high-accuracy overcurrent protection in power regulation feedback loops. It operates with –2 V to 76 V common-mode input voltage, supports adjustable gain via external resistor RG (1×–100×), delivers buffered output up to 5 mA, and achieves ≤3.4% total gain error across –40°C to 125°C - enabling precise current limiting in battery charging and LED driver circuits.
For engineers reviewing the LMP8646MK/NOPB datasheet, LMP8646MK/NOPB pinout, LMP8646MK/NOPB application, or LMP8646MK/NOPB equivalent, key selection criteria include its wide common-mode range, transconductance-based sensing architecture, external bandwidth control via CG, ±1 mV input offset, and 6-pin SOT package compatibility with space-constrained industrial and automotive power management layouts.
Technical Context
The LMP8646MK/NOPB implements a transconductance amplifier architecture where input sense voltage (VSENSE = +IN − −IN) drives a fixed 5 kΩ internal input resistance (RIN = 1/Gm), generating proportional input current IIN = VSENSE / 5 kΩ. This current flows through the external gain-setting resistor RG to produce VOUT = VSENSE × (RG / 5 kΩ), enabling programmable gain from 1× to 100×.
Bandwidth is externally adjustable via capacitor CG placed in parallel with RG, allowing optimization for transient response versus noise rejection. The buffered output provides low-impedance drive capability (≤5 mA source) while maintaining high PSRR (85 dB) and CMRR (95 dB at VCM > 2.1 V), critical for stable operation in noisy high-side sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 12 V - supports single-supply operation across standard logic and analog rails without auxiliary biasing. |
| Common-Mode Input Range | –2 V to 76 V - enables direct high-side current sensing in buck converters, battery stacks, and 48 V telecom systems. |
| Transconductance (Gm) | 200 μA/V - defines fixed input resistance RIN = 5 kΩ, ensuring predictable gain scaling with RG and minimizing RSENSE tolerance impact. |
| Input Offset Voltage | ±1 mV max at 25°C - limits worst-case error to ≤1% at VSENSE ≥ 100 mV, critical for accurate current threshold setting. |
| Gain Accuracy | ±2.0% max at 25°C; ±3.4% over –40°C to 125°C - enables tight current limit tolerances without calibration in production systems. |
| Output Current Capability | 0 to 5 mA sourcing - sufficient to drive feedback nodes of most voltage-mode DC/DC controllers without external buffering. |
| Quiescent Current | 380 μA typical at 2.7 V - ensures minimal standby power draw in always-on protection circuits. |
Pinout & Package
Package: 6-pin SOT-23 (DDC), body size 2.90 mm × 1.60 mm, surface-mount, lead-free (NOPB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Single-ended output voltage | Buffered, low-impedance output delivering VOUT = VSENSE × (RG / 5 kΩ); drives regulator feedback node directly. |
| V− | Negative supply voltage | Must be connected to ground; establishes reference for internal circuitry and defines lower bound of output swing. |
| +IN | Positive input terminal | High-impedance node connected to high-side of sense resistor; accepts voltages up to 80 V absolute max. |
| −IN | Negative input terminal | High-impedance node connected to low-side of sense resistor; common-mode range extends to –6 V absolute min. |
| RG | External gain resistor connection | Connects external resistor (and optional CG capacitor) to set gain; determines full-scale output scaling factor. |
| V+ | Positive supply voltage | Supplies internal circuitry; must be ≥2.7 V and ≤12 V; powers output buffer and amplifier core. |
Key Features
| Feature | Design Value |
|---|---|
| Variable gain via single external resistor | RG sets gain from 1× to 100× (VOUT = VSENSE × RG/5 kΩ), eliminating need for multiple fixed-gain variants. |
| Adjustable bandwidth via external capacitor | CG in parallel with RG allows frequency response tuning (e.g., 1 kHz to 35 kHz) to balance speed vs. noise immunity. |
| Buffered output stage | Low-output-impedance driver (≤5 mA) interfaces directly with voltage-mode controller feedback pins without loading error. |
| High common-mode rejection | 95 dB CMRR above 2.1 V common-mode voltage ensures accurate sensing despite large supply ripple or ground bounce. |
| Wide operating temperature range | –40°C to 125°C specified performance enables use in under-hood automotive, industrial motor drives, and outdoor power systems. |
Applications
| Battery Charging Protection | LED Constant Current Drive |
|---|---|
|
Use Scenario: Monitoring charge current in 12 V–48 V Li-ion battery packs during CC/CV charging phases. IC Role / Device Role / Timing Role: High-side current limiter feeding feedback signal to charger IC to enforce precise current thresholds. Use Value: Enables ±3.4% current limit accuracy over full temperature range without calibration, improving cell safety and cycle life. |
Use Scenario: Regulating forward current in high-power LED strings powered from buck converters in automotive lighting. IC Role / Device Role / Timing Role: Precision current sense amplifier providing feedback to PWM controller for stable LED brightness control. Use Value: Delivers 100 mV–600 mV input sense range with <1 mV offset, minimizing shunt loss while maintaining ±2% gain accuracy. |
| Industrial Power Supply Fault Protection | Telecom 48 V DC Distribution Monitoring |
|
Use Scenario: Detecting overcurrent events in programmable DC supplies used for test equipment and factory automation. IC Role / Device Role / Timing Role: Fast-response current limiter interfacing with supervisor IC to trigger shutdown within microseconds of fault onset. Use Value: Adjustable bandwidth (via CG) allows optimization for <1 µs response time while rejecting switching noise from adjacent SMPS stages. |
Use Scenario: Monitoring load current on 48 V intermediate bus in telecom rectifier modules and distributed power architectures. IC Role / Device Role / Timing Role: High-common-mode current monitor feeding telemetry ADC and protection logic in hot-swap controllers. Use Value: –2 V to 76 V input range supports direct sensing on positive rail without level-shifting, reducing BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current limiting applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | Fixed gain (20×), higher bandwidth (400 kHz), integrated EMI filtering, but narrower common-mode range (–4 V to 80 V). | Better suited for high-speed motor phase current sensing; less flexible for variable-threshold designs requiring gain adjustment. | Select when fixed gain and faster response outweigh need for external RG tuning and ultra-wide VCM support. |
| MAX40056ATA+T | Higher accuracy (±0.5% gain error), wider supply (2.7 V–60 V), but limited common-mode range (–0.1 V to 65 V) and no buffered output. | Preferred for precision lab equipment where offset drift matters more than high-side sensing flexibility. | Choose when sub-1% system-level current accuracy is mandatory and VCM stays above –0.1 V; requires external buffer for feedback drive. |
Compared with INA240A1IDR and MAX40056ATA+T, the LMP8646MK/NOPB uniquely combines programmable gain, ultra-wide –2 V to 76 V common-mode operation, and buffered output in a 6-pin SOT - making it optimal for cost-sensitive, field-deployed systems requiring adaptable current limiting across diverse supply topologies.
Availability
LMP8646MK/NOPB is available at Aetrix Electronics and suitable for battery charging protection, LED constant current drive, and industrial power supply fault protection requiring stable component supply and long-term manufacturing continuity.
Supply support for LMP8646MK/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 LMP8646 belongs to TI's precision current sensing portfolio, engineered specifically for high-accuracy, wide common-mode current limiting in industrial, automotive, and telecom power systems where reliability and design flexibility are critical.
FAQ
What is the maximum common-mode voltage the LMP8646MK/NOPB can handle?
The LMP8646MK/NOPB supports a common-mode input voltage range of –2 V to 76 V, verified per Absolute Maximum Ratings and Recommended Operating Conditions. This allows direct high-side sensing in 48 V telecom systems and battery stacks without level-shifting circuitry. Operation beyond these limits risks permanent damage, and the device is not rated for sustained operation at 80 V on +IN or –IN pins.
How does the external resistor RG set gain in the LMP8646MK/NOPB?
In the LMP8646MK/NOPB, RG sets gain according to VOUT = VSENSE × (RG / 5 kΩ), where 5 kΩ is the fixed internal transconductance-derived input resistance (RIN = 1/Gm). For example, RG = 50 kΩ yields nominal gain = 10×. Gain accuracy remains within ±2.0% at 25°C, and the resistor must be placed between RG pin and V− (ground) with optional CG capacitor in parallel for bandwidth control.
Can the LMP8646MK/NOPB operate from a 3.3 V supply?
Yes, the LMP8646MK/NOPB is fully specified for operation from 2.7 V to 12 V supply (V+ to V−), including 3.3 V. At 3.3 V, typical quiescent current is ~450 μA, and maximum output voltage depends on VCM and RG value - e.g., with VCM = 5 V and RG = 500 kΩ, VOUT_MAX ≈ 3.3 V. Performance parameters like PSRR and CMRR remain within datasheet limits across this range.
What is the purpose of the CG capacitor in the LMP8646MK/NOPB circuit?
The CG capacitor, placed in parallel with RG, forms an RC network that controls the LMP8646MK/NOPB's small-signal bandwidth - e.g., CG = 4 pF with RG = 25 kΩ yields ~35 kHz bandwidth. This allows designers to suppress high-frequency noise while preserving response to legitimate overcurrent events, avoiding false triggering in switch-mode power supplies with fast transients.
Does the LMP8646MK/NOPB require a dual supply or can it run on single-ended power?
The LMP8646MK/NOPB is explicitly designed for single-supply operation: V− must be connected to ground, and V+ supplied from 2.7 V to 12 V. Its input stage accepts differential signals referenced to any common-mode voltage between –2 V and 76 V relative to ground, eliminating need for split supplies while supporting true high-side sensing - a key differentiator from conventional op-amps.
LMP8646MK/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:
- 0.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- 12.5 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 2.1mA
- 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
LMP8646MK/NOPB FAQ
1.How can I place an order for LMP8646MK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8646MK/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 LMP8646MK/NOPB reliable?
The price and inventory of LMP8646MK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8646MK/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8646MK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8646MK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8646MK/NOPB?
LMP8646MK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8646MK/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 LMP8646MK/NOPB?
For technical support, including LMP8646MK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8646MK/NOPB requirements.
6.How does Aetrix verify that LMP8646MK/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8646MK/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 LMP8646MK/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8646MK/NOPB?
All LMP8646MK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8646MK/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 LMP8646MK/NOPB part is unused and in its original packaging.
Return procedure for LMP8646MK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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