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Texas Instruments LMP8481AHQDGKRQ1
- Part No.:
- LMP8481AHQDGKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481AHQDGKRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,001
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Product details
Overview
LMP8481AHQDGKRQ1 from Texas Instruments is an automotive-grade, high-side current-sense amplifier with bidirectional sensing capability, 100 V/V fixed gain, ±80 µV input offset voltage, 270 kHz bandwidth, and operation across 4.5 V to 76 V supply and 4.0 V to 76 V common-mode voltage ranges-designed for precision battery management and inverter current monitoring in 12 V/48 V hybrid systems.
For engineers reviewing the LMP8481AHQDGKRQ1 datasheet, LMP8481AHQDGKRQ1 pinout, LMP8481AHQDGKRQ1 application, or LMP8481AHQDGKRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to 125°C), buffered 5 mA output drive, 124 dB DC CMRR, reference-configurable zero point via REFA/REFB pins, and compatibility with high-common-mode, high-speed motor control feedback loops.
Technical Context
The LMP8481AHQDGKRQ1 implements a two-stage architecture: first, a precision thin-film resistor-based current-to-voltage converter converts VSENSE into differential currents; second, a servo-controlled differential amplifier with internal 14-V LDO supplies level-shifted gain and reference summation. Its gain is fixed at 100 V/V by internal 19.676 kΩ input resistors and 393.52 kΩ tail resistors.
Unlike unidirectional variants, the LMP8481AHQDGKRQ1 supports bidirectional current sensing via externally configurable REFA and REFB pins-enabling output centering at GND, VCC/2, or external mid-scale reference-while maintaining 270 kHz –3 dB bandwidth and 1 µs slew rate under 20 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - fixed, temperature-stable gain enabling accurate current measurement with minimal calibration over –40°C to 125°C. |
| Input Offset Voltage | ±80 µV (25°C) - enables use of smaller sense resistors (e.g., ≤1 mΩ) without degrading low-current accuracy in battery shunt monitoring. |
| Bandwidth (–3 dB) | 270 kHz - supports fast transient detection in motor phase current sensing and DC-DC converter overcurrent protection. |
| Common-Mode Range | 4.0 V to 76 V - allows direct placement on high-side bus of 48 V traction inverters or 12 V body control modules without level-shifting circuitry. |
| Supply Voltage Range | 4.5 V to 76 V - permits single-supply operation powered directly from monitored rail (e.g., 48 V battery), eliminating auxiliary bias supplies. |
| DC CMRR | 124 dB - rejects noise from high-dv/dt switching nodes in powertrain inverters, preserving signal integrity in noisy automotive environments. |
| Output Drive | >5 mA sourcing/sinking - drives ADC inputs or comparator thresholds directly without external buffers in BMS front-end designs. |
Pinout & Package
Package: 8-pin VSSOP (DGK), 3.00 mm × 3.00 mm body size, exposed pad optional, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RSP | Positive current-sense input | Connects to high-side of sense resistor; accepts up to 76 V common-mode voltage while rejecting ground noise. |
| RSN | Negative current-sense input | Connects to low-side of sense resistor; differential pair with RSP defines VSENSE = VRSP – VRSN for bidirectional polarity detection. |
| VCC | Positive supply voltage | Supplies internal 14-V LDO and amplifier stages; overlaps common-mode range, enabling rail-tied operation. |
| GND | Ground reference | Analog ground return for internal circuitry; must be connected to system ground with low-impedance path to minimize offset error. |
| VOUT | Amplified output | Buffered, rail-to-rail capable output delivering gain × VSENSE + VREF′; drives 100 kΩ loads with <1% linearity error. |
| REFA | Reference voltage A input | One leg of internal 100 kΩ resistor divider; sets output zero point when paired with REFB per Equation 5 or 6 in datasheet. |
| REFB | Reference voltage B input | Second leg of internal 100 kΩ resistor divider; average of REFA and REFB defines VREF′ applied to output stage. |
| NC | No connection | Pins 3, 6, and 7 are unconnected in LMP8481-Q1 DGK package; must remain floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing support | REFA/REFB pins enable configurable output zero point (GND, VCC/2, or external mid-scale), allowing current direction detection in regenerative braking circuits. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C ambient operation with HBM ±2 kV / CDM ±750 V ESD robustness-suitable for under-hood powertrain modules. |
| High DC rejection | 124 dB CMRR and 122 dB PSRR suppress bus ripple and supply noise, ensuring stable measurements in 48 V DC-DC converters with >100 kHz switching. |
| Low quiescent current | <100 µA supply current enables always-on current monitoring in battery disconnect units without significant standby drain. |
| Fast settling time | 20 µs to 1% for 10 mV → 100 mV steps-supports real-time overcurrent response in motor gate drivers with <50 µs fault clearance requirements. |
Applications
| Electric Power Steering (EPS) | Battery Management System (BMS) |
|---|---|
Use Scenario: Real-time phase current monitoring in 48 V EPS motor controllers during assist and return torque events. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting motor winding shunt voltage to conditioned analog output for MCU ADC sampling at 100 kSPS. Use Value: 270 kHz bandwidth and 20 µs settling enable accurate torque estimation during rapid transients; 100 V/V gain resolves ±200 A full-scale with 1 mΩ shunt. |
Use Scenario: Bidirectional cell-string current measurement in 48 V mild-hybrid battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Precision current sensor interfacing between shunt resistor and isolated sigma-delta ADC, with REFA/REFB set to half-reference for bipolar output swing. Use Value: ±80 µV offset ensures <0.5% error at 5 A discharge; AEC-Q100 qualification guarantees reliability across thermal cycling in pack-level assemblies. |
| Onboard Charger (OBC) Inverter | 12 V Body Control Module (BCM) |
Use Scenario: High-side DC-link current sensing in bi-directional OBC inverters supporting vehicle-to-grid (V2G) energy transfer. IC Role / Device Role / Timing Role: Isolated current monitor front-end providing galvanically referenced analog output to controller for real-time power regulation and fault detection. Use Value: 76 V common-mode range accommodates 400 V DC-link with margin; buffered 5 mA output drives isolation amplifier input without gain error from source impedance. |
Use Scenario: Load current monitoring for smart fusing and diagnostics in 12 V BCM domains (e.g., headlight, HVAC, seat control). IC Role / Device Role / Timing Role: High-side current amplifier feeding MCU ADC to detect open-circuit, short-circuit, and overcurrent conditions with <10 ms response. Use Value: 4.5 V minimum supply allows operation during cold-crank (6.5 V battery sag); 124 dB CMRR rejects ignition noise in engine bay proximity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4081AUA+ | Fixed 100 V/V gain, but higher ±300 µV offset and no REFA/REFB pins-unidirectional only; lacks AEC-Q100 qualification. | Suitable for non-automotive industrial power supplies where bidirectional sensing and automotive temp grade are not required. | Select MAX4081AUA+ only if cost sensitivity outweighs need for bidirectional capability and automotive qualification. |
| INA240A1QDRQ1 | 100 V/V gain, ±20 µV offset, 420 kHz bandwidth, but requires external reference for bidirectional operation; same AEC-Q100 Grade 1 rating. | Better suited for ultra-high-accuracy BMS where sub-0.1% gain error and lower offset dominate over integrated reference flexibility. | Choose INA240A1QDRQ1 when lowest possible offset and wider bandwidth justify added external reference design complexity. |
Compared with MAX4081AUA+, the LMP8481AHQDGKRQ1 delivers superior offset performance and built-in bidirectional reference control; versus INA240A1QDRQ1, it trades 150 kHz bandwidth and 60 µV lower offset for integrated REFA/REFB simplicity and proven automotive layout robustness.
Availability
LMP8481AHQDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering, battery management systems, and onboard charger inverters requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant traceability.
Supply support for LMP8481AHQDGKRQ1 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 automotive IC development expertise and ISO/TS 16949-certified manufacturing.
The LMP8481AHQDGKRQ1 belongs to TI's automotive-qualified current-sense amplifier product line, engineered specifically for high-reliability, high-common-mode voltage monitoring in electric powertrain, battery, and chassis control systems.
FAQ
What is the maximum common-mode voltage supported by the LMP8481AHQDGKRQ1?
The LMP8481AHQDGKRQ1 supports a common-mode input voltage range of 4.0 V to 76 V. This allows direct high-side sensing on 48 V battery rails or 12 V systems with margin, without requiring level-shifting circuitry. The specification is validated across –40°C to 125°C ambient temperature and applies to both RSP and RSN pins simultaneously.
How does the LMP8481AHQDGKRQ1 achieve bidirectional current sensing?
The LMP8481AHQDGKRQ1 achieves bidirectional sensing through its dedicated REFA and REFB pins, which form an internal resistor divider network. By applying appropriate voltages-such as grounding REFB and connecting REFA to VCC-the output zero point shifts to VCC/2, enabling positive and negative VSENSE to produce corresponding above/below-mid-scale outputs. This configuration is explicitly supported in the device's functional description and typical application schematics.
Is the LMP8481AHQDGKRQ1 pin-compatible with the LMP8480-Q1 series?
No, the LMP8481AHQDGKRQ1 is not pin-compatible with LMP8480-Q1 variants. While both share the same 8-pin VSSOP (DGK) package and RSP/RSN/VCC/GND/VOUT pin assignments, the LMP8481AHQDGKRQ1 uses pins 6 and 7 for REFB and REFA respectively-whereas LMP8480-Q1 leaves those pins unconnected. Interchanging them without circuit modification will result in undefined output behavior.
What is the purpose of the NC pins on the LMP8481AHQDGKRQ1 DGK package?
Pins 3, 6, and 7 are designated NC (no connection) in the LMP8481AHQDGKRQ1 DGK package drawing-but this applies only to pin 3. Pins 6 and 7 are functional REFB and REFA inputs. Pin 3 must remain unconnected or grounded per TI layout recommendations to avoid parasitic coupling; incorrect routing to pin 3 may degrade CMRR or introduce offset drift in production units.
Does the LMP8481AHQDGKRQ1 require external decoupling capacitors?
Yes, the LMP8481AHQDGKRQ1 requires a 0.1 µF ceramic capacitor between VCC and GND, placed as close as possible to the device pins. This bypass capacitor stabilizes the internal 14-V LDO and suppresses high-frequency supply noise that could modulate the output. TI's datasheet Figure 18 and Layout Guidelines section explicitly mandate this capacitor for all operating conditions, including automotive temperature and vibration stress.
LMP8481AHQDGKRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 270 kHz
- -3db Bandwidth:
- 270 kHz
- Current - Input Bias:
- 6.3 µA
- Voltage - Input Offset:
- 80 µV
- Current - Supply:
- 88µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 76 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMP8481AHQDGKRQ1 FAQ
1.How can I place an order for LMP8481AHQDGKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481AHQDGKRQ1 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 LMP8481AHQDGKRQ1 reliable?
The price and inventory of LMP8481AHQDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8481AHQDGKRQ1 is usually 5 days.
3.What payment methods are accepted for LMP8481AHQDGKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481AHQDGKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481AHQDGKRQ1?
LMP8481AHQDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481AHQDGKRQ1 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 LMP8481AHQDGKRQ1?
For technical support, including LMP8481AHQDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481AHQDGKRQ1 requirements.
6.How does Aetrix verify that LMP8481AHQDGKRQ1 is sourced from the original manufacturer or authorized distributors?
All LMP8481AHQDGKRQ1 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 LMP8481AHQDGKRQ1 meets industry standards.
7.What is the process for return or replacement of LMP8481AHQDGKRQ1?
All LMP8481AHQDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481AHQDGKRQ1, 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 LMP8481AHQDGKRQ1 part is unused and in its original packaging.
Return procedure for LMP8481AHQDGKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8481AHQDGKRQ1 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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