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Texas Instruments LMP8646MKE/NOPB
- Part No.:
- LMP8646MKE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8646MKE/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:616
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Product details
Overview
LMP8646MKE/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 LMP8646MKE/NOPB datasheet, LMP8646MKE/NOPB pinout, LMP8646MKE/NOPB application, or LMP8646MKE/NOPB equivalent, key selection criteria include its wide common-mode range, transconductance of 200 μA/V, ±1 mV max input offset, 95 dB CMRR at high VCM, and SOT-6 package compatibility with space-constrained industrial and automotive power management layouts.
Technical Context
The LMP8646MKE/NOPB functions as a transconductance amplifier with programmable gain and bandwidth: input sense voltage (VSENSE = +IN − −IN) is converted to output current IOUT = VSENSE × Gm, where Gm = 200 μA/V is fixed, and external RG sets effective gain (VOUT = VSENSE × RG / 5 kΩ). Its buffered voltage output interfaces directly with regulator feedback nodes without loading.
Bandwidth is adjusted by adding capacitor CG in parallel with RG; common-mode rejection remains ≥95 dB for VCM > 2.1 V; PSRR is 85 dB across 2.7–12 V supply; and output accuracy is maintained via low offset (±1 mV) and tight gain tolerance (≤2.0% at 25°C, ≤3.4% over full temperature range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 12 V - supports single-supply operation from low-voltage logic rails up to industrial 12 V systems. |
| Common-Mode Input Range | –2 V to 76 V - enables direct sensing on high-side or low-side FETs in buck, boost, and linear regulators. |
| Transconductance (Gm) | 200 μA/V - defines fixed input-to-output current conversion ratio, independent of RG or temperature drift. |
| Input Offset Voltage | ±1 mV max - limits baseline error in current measurement, critical for accurate 100 mV sense thresholds. |
| Output Current (Source) | 0 to 5 mA - sufficient to drive standard voltage-mode feedback pins (e.g., TLV431, LM3102 FB) without buffering. |
| CMRR | 95 dB (for 2.1 V < VCM < 76 V) - ensures stable gain under high common-mode noise typical in motor drives and DC/DC converters. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive, industrial PLC, and telecom power modules. |
Pinout & Package
Package: 6-pin SOT-23 (DDC), body size 2.90 mm × 1.60 mm, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Single-ended output voltage | Buffered, low-impedance voltage output proportional to sensed current; drives regulator feedback node directly. |
| V− | Negative supply voltage | Ground reference for internal circuitry; must be connected to system ground or negative rail. |
| +IN | Positive input terminal | High-impedance input for one side of sense resistor (RSENSE); accepts voltages up to 80 V absolute. |
| −IN | Negative input terminal | High-impedance input for other side of RSENSE; differential pair with +IN defines VSENSE = +IN − −IN. |
| RG | External gain resistor connection | Connects to external resistor (and optional CG capacitor) to set gain: Gain = RG / 5 kΩ (RIN = 1/Gm). |
| V+ | Positive supply voltage | Power supply input (2.7–12 V); powers internal amplifier and output buffer; decoupling required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Variable gain via single external resistor | Gain = RG / 5 kΩ (1×–100× range); eliminates need for multiple fixed-gain variants and simplifies BOM. |
| Adjustable bandwidth via external capacitor | CG in parallel with RG sets dominant pole; enables stability tuning for fast transient response or EMI filtering. |
| Buffered output stage | Low-output-impedance voltage source (≤50 Ω typical); prevents loading of feedback network in switching regulators. |
| High common-mode rejection at elevated VCM | 95 dB CMRR maintained up to 76 V common-mode - preserves accuracy in high-voltage battery monitoring and 48 V systems. |
| 3% output accuracy at 100 mV sense | Guaranteed over full temperature range (–40°C to 125°C); enables reliable current limit threshold setting without calibration. |
Applications
| Battery Charging Protection | LED Constant Current Drive |
|---|---|
Use Scenario: Monitoring charge current in 12 V–48 V Li-ion or lead-acid battery chargers with integrated DC/DC regulation. IC Role / Device Role / Timing Role: Precision current limiter placed in series with charging path; converts RSENSE voltage to regulated feedback signal for charger IC. Use Value: Enables ±3.4% current limit accuracy over automotive temperature range, reducing thermal derating and improving charge efficiency. |
Use Scenario: Driving high-brightness LEDs in automotive lighting or industrial signage using constant-current buck regulators. IC Role / Device Role / Timing Role: High-side current sensor feeding feedback loop of LED driver IC (e.g., LM3409), maintaining stable current despite input voltage variation. Use Value: Supports 76 V common-mode operation to handle boost converter outputs; buffered output avoids feedback instability with long PCB traces. |
| Industrial Power Supply Fault Protection | Telecom DC/DC Module Current Limiting |
Use Scenario: Adding precise overcurrent protection to isolated 24 V or 48 V industrial SMPS without redesigning control loop. IC Role / Device Role / Timing Role: Interfacing between sense resistor and voltage-mode controller (e.g., UC384x) to enforce fast, accurate current limit during short-circuit events. Use Value: 0.5–0.6 V/µs slew rate and 35 kHz bandwidth option allow rapid response while avoiding false triggering from switching noise. |
Use Scenario: Enhancing current limit accuracy in telecom-grade 48 V input, 3.3 V/5 V output DC/DC modules used in base stations and routers. IC Role / Device Role / Timing Role: Low-offset current limiter inserted into feedback path of secondary-side controller (e.g., TPS543B20) to improve load-step immunity. Use Value: 85 dB PSRR and 95 dB CMRR suppress ripple and noise from high-frequency switching, ensuring stable regulation under dynamic loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current limiter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | Fixed gain (20 V/V), higher bandwidth (400 kHz), lower offset (±20 µV), but narrower common-mode range (–4 V to 80 V) and no RG-based gain adjustment. | Better for high-speed current monitoring; unsuitable when variable gain or ultra-low-cost resistor-based scaling is required. | Select INA240A1IDR when precision and speed outweigh flexibility; use LMP8646MKE/NOPB when gain must be tuned per design without changing IC. |
| MAX40056ATA+T | Higher common-mode range (–10 V to 110 V), integrated reference, but requires dual supply and lacks buffered output - needs external op-amp for feedback interface. | Preferred for ultra-high-voltage battery management; adds complexity for simple regulator feedback integration. | Choose MAX40056ATA+T for >76 V systems; retain LMP8646MKE/NOPB for cost-sensitive, single-supply, drop-in regulator feedback augmentation. |
Compared with INA240A1IDR and MAX40056ATA+T, the LMP8646MKE/NOPB uniquely combines single-supply operation, externally adjustable gain, buffered output, and guaranteed 3.4% accuracy over –40°C to 125°C - making it optimal for retrofitting current limiting into existing voltage-mode regulator designs without layout or supply changes.
Availability
LMP8646MKE/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 production continuity.
Supply support for LMP8646MKE/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-sense limiter product line, engineered specifically to enhance current limit accuracy in switching and linear regulators by interfacing seamlessly with their feedback nodes - targeting automotive, industrial, and telecom power systems.
FAQ
What is the maximum common-mode voltage supported by the LMP8646MKE/NOPB?
The LMP8646MKE/NOPB supports a common-mode input voltage range of –2 V to 76 V, verified per Absolute Maximum Ratings and Recommended Operating Conditions in the datasheet. This allows direct high-side sensing in 48 V systems and compatibility with negative-rail configurations such as low-side current monitoring in buck converters with grounded switches. The LMP8646MKE/NOPB maintains 95 dB CMRR above 2.1 V common-mode.
How is gain configured on the LMP8646MKE/NOPB?
Gain on the LMP8646MKE/NOPB is set by an external resistor RG connected between the RG pin and V−, using the formula Gain = RG / 5 kΩ (where 5 kΩ = 1/Gm). For example, RG = 50 kΩ yields 10× gain. A capacitor CG may be added in parallel with RG to limit bandwidth. The LMP8646MKE/NOPB does not require trimming or digital configuration - gain is fully analog and resistor-determined.
Does the LMP8646MKE/NOPB require a dual supply?
No, the LMP8646MKE/NOPB operates from a single supply ranging from 2.7 V to 12 V, with V− referenced to ground. Its inputs tolerate –2 V to 76 V common-mode voltage independently of the supply rail, eliminating need for level-shifting or split supplies. This single-supply architecture simplifies power design in battery-powered and industrial 12 V systems using the LMP8646MKE/NOPB.
What is the output drive capability of the LMP8646MKE/NOPB?
The LMP8646MKE/NOPB provides a buffered voltage output capable of sourcing up to 5 mA while maintaining linearity and low output impedance (<50 Ω). This allows direct connection to standard regulator feedback pins (e.g., TLV431, LM3102) without external buffers. Load capacitance must be limited to ≤30 pF to preserve stability, as specified in Electrical Characteristics.
Can the LMP8646MKE/NOPB be used for both high-side and low-side current sensing?
Yes - the LMP8646MKE/NOPB supports both configurations due to its –2 V to 76 V common-mode input range and rail-to-rail input stage. In high-side sensing, +IN connects to the supply side of RSENSE and −IN to the load side; in low-side, −IN connects to ground and +IN to the shunt's load side. The LMP8646MKE/NOPB's architecture ensures accuracy in either topology without performance penalty.
LMP8646MKE/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
LMP8646MKE/NOPB FAQ
1.How can I place an order for LMP8646MKE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8646MKE/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 LMP8646MKE/NOPB reliable?
The price and inventory of LMP8646MKE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8646MKE/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8646MKE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8646MKE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8646MKE/NOPB?
LMP8646MKE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8646MKE/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 LMP8646MKE/NOPB?
For technical support, including LMP8646MKE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8646MKE/NOPB requirements.
6.How does Aetrix verify that LMP8646MKE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8646MKE/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 LMP8646MKE/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8646MKE/NOPB?
All LMP8646MKE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8646MKE/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 LMP8646MKE/NOPB part is unused and in its original packaging.
Return procedure for LMP8646MKE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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