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Texas Instruments LMP8481ASQDGKRQ1
- Part No.:
- LMP8481ASQDGKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481ASQDGKRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,070
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Product details
Overview
LMP8481ASQDGKRQ1 from Texas Instruments is an automotive-grade, bidirectional high-side current-sense amplifier with 60 V/V fixed gain, 270 kHz bandwidth, ±80 µV input offset voltage, and 4.0 V to 76 V common-mode input range. It operates from a single 4.5 V to 76 V supply and delivers buffered output capable of sourcing >5 mA - enabling direct interface with 12-bit ADCs in battery management and powertrain monitoring systems.
For engineers reviewing the LMP8481ASQDGKRQ1 datasheet, LMP8481ASQDGKRQ1 pinout, LMP8481ASQDGKRQ1 application, or LMP8481ASQDGKRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), 124 dB DC CMRR, ±0.1% gain accuracy, reference-adjustable output zero point, and compatibility with Kelvin-shunt layouts for precision bidirectional current sensing in high-voltage automotive subsystems.
Technical Context
The LMP8481ASQDGKRQ1 implements a two-stage architecture: first, a precision thin-film resistor-based current-to-voltage converter converts differential sense voltage into imbalanced input currents; second, a differential amplifier with internal 14-V LDO supplies level-shifted gain-of-five output stage. Its VREFA/REFB pins enable configurable output reference biasing - supporting unidirectional zero-referenced, bidirectional mid-scale (VCC/2), or externally referenced operation.
Unlike unidirectional LMP8480-Q1 variants, the LMP8481ASQDGKRQ1 supports true bidirectional sensing via independent reference inputs, allowing output polarity to reflect current direction relative to user-defined zero point. Its 7 µA input bias current, 122 dB PSRR, and 95 nV/√Hz input noise ensure stable performance under noisy high-voltage rail conditions typical in inverters and body control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60 V/V fixed - enables precise scaling of ±16.7 mV full-scale sense voltage to ±1 V output for 12-bit ADCs with minimal gain error drift. |
| Common-Mode Range | 4.0 V to 76 V - allows direct sensing on 12 V, 24 V, and 48 V automotive battery rails without level-shifting or auxiliary supplies. |
| Bandwidth | 270 kHz (–3 dB) - supports fast transient detection in motor control loops and overcurrent protection circuits. |
| Input Offset Voltage | ±80 µV (25°C), ±900 µV (–40°C to +125°C) - permits use of low-value shunts (e.g., 500 µΩ) while maintaining <1% total error at 10 A. |
| Supply Voltage | 4.5 V to 76 V - matches common-mode range, enabling single-supply operation powered directly from monitored rail. |
| Output Drive | >5 mA sourcing capability - eliminates need for external buffer when driving ADC input capacitance or long PCB traces. |
| CMRR / PSRR | 124 dB / 122 dB (DC) - rejects noise from high-dv/dt switching nodes in inverters and DC-DC converters. |
Pinout & Package
Package: 8-pin VSSOP (DGK), 3.00 mm × 3.00 mm, exposed pad optional - optimized for thermal performance in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RSP | Positive current-sense input | Connects to high-side of shunt resistor; accepts up to 76 V common-mode voltage with 7 µA bias current. |
| RSN | Negative current-sense input | Connects to low-side of shunt; forms differential pair with RSP for accurate VSENSE measurement. |
| VCC | Positive supply voltage | Single supply input (4.5–76 V); powers internal 14-V LDO and amplifier stages - may be tied to monitored rail. |
| GND | Ground reference | Analog ground return for internal circuitry; must be star-connected to shunt and load ground to avoid measurement errors. |
| VOUT | Amplified output | Buffered, rail-to-rail capable output (min 3 mV, max VCC – 230 mV); drives ADCs, comparators, or microcontroller inputs directly. |
| REFA | Reference voltage A input | Configurable bias input; when tied to VCC, sets output zero at VCC/2 for bidirectional mid-scale ADC interfacing. |
| REFB | Reference voltage B input | Second reference input; tied to GND with REFA to VCC yields VCC/2 offset; tied together enables 1:1 external VREF mapping. |
| NC | No connection | Pins 3, 6, and 7 are unconnected in LMP8481ASQDGKRQ1 - must remain floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing support | Configurable output zero point via dual VREF inputs enables current direction detection - critical for regenerative braking and battery charge/discharge monitoring. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV and CDM ±750 V ESD robustness - meets automotive functional safety requirements. |
| High-accuracy fixed gain | ±0.1% gain accuracy at 25°C and ±0.8% over temperature ensures consistent current scaling across vehicle life without calibration. |
| Integrated 14-V LDO | Stabilizes internal analog circuitry independent of supply ripple - maintains 270 kHz bandwidth and 124 dB CMRR even with noisy 12 V battery input. |
| Low quiescent current | <100 µA supply current at 76 V - enables always-on monitoring in low-power wake-up domains without compromising battery standby time. |
Applications
| Body Control Module (BCM) | Electric Power Steering (EPS) |
|---|---|
Use Scenario: Real-time monitoring of headlight, wiper, and seat-motor loads in 12 V/24 V BCMs. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated, rail-referenced analog feedback to MCU ADC. Use Value: Enables load diagnostics, short-circuit detection, and energy accounting using same shunt as main power path - no added insertion loss. |
Use Scenario: Bidirectional motor phase current sensing in 48 V EPS inverters during assist and return modes. IC Role / Device Role / Timing Role: Precision current amplifier with VCC/2 output bias feeding dual-slope ADC for torque estimation. Use Value: 270 kHz bandwidth captures PWM-edge transients; ±80 µV offset ensures <0.5% error at 5 A motor stall current. |
| Battery Management System (BMS) | Onboard Charger (OBC) |
Use Scenario: Cell-string current monitoring in 400 V traction battery packs during charging and discharging cycles. IC Role / Device Role / Timing Role: High-common-mode amplifier isolating sense signal from high-voltage domain to 3.3 V MCU side. Use Value: 76 V common-mode range covers full pack voltage; 124 dB CMRR rejects common-mode noise from DC-DC isolation stages. |
Use Scenario: Input AC line current sensing and DC-link current monitoring in bi-directional OBCs for V2G applications. IC Role / Device Role / Timing Role: Dual-role amplifier - unidirectional for AC input, bidirectional for DC-link regeneration current. Use Value: Single device replaces two amplifiers; REFA/REFB reconfiguration supports both measurement modes without hardware change. |
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+ | Same 60 V/V gain, but higher ±300 µV offset (25°C), lower 100 kHz bandwidth, and no AEC-Q100 qualification. | Lacks automotive temperature grade and fails CMRR spec (110 dB) - unsuitable for safety-critical powertrain use. | Select only for cost-sensitive non-automotive industrial designs where AEC-Q100 and 270 kHz response are not required. |
| INA240A1QDRQ1 | Higher 200 V/V gain option, ±20 µV offset, but narrower 4.5–80 V supply range and no VREF adjustability. | Fixed zero-reference output limits bidirectional flexibility; requires external level-shifting for mid-scale ADC interfacing. | Prefer when ultra-low offset dominates design priority and reference configurability is unnecessary - e.g., unidirectional battery fuse monitoring. |
Compared with MAX4081AUA+ and INA240A1QDRQ1, the LMP8481ASQDGKRQ1 uniquely combines AEC-Q100 Grade 1 compliance, programmable VREF biasing, and 270 kHz bandwidth - making it the only choice for automotive bidirectional current sensing where safety, flexibility, and dynamic response are jointly critical.
Availability
LMP8481ASQDGKRQ1 is available at Aetrix Electronics and suitable for battery management, powertrain control, and onboard charger designs requiring stable component supply across extended automotive product lifecycles.
Supply support for LMP8481ASQDGKRQ1 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 deep expertise in automotive-grade signal conditioning and power management ICs.
The LMP8481ASQDGKRQ1 belongs to TI's automotive current-sense amplifier portfolio, designed specifically for high-accuracy, high-voltage, high-reliability current monitoring in electric powertrain, battery, and chassis control systems.
FAQ
What is the exact gain setting of the LMP8481ASQDGKRQ1?
The LMP8481ASQDGKRQ1 has a fixed gain of 60 V/V, confirmed by TI's official datasheet SNVSAL6A and device marking "S" suffix. This gain is laser-trimmed at wafer test and maintains ±0.1% accuracy at 25°C and ±0.8% over –40°C to +125°C ambient - enabling precise current-to-voltage conversion without external gain-setting resistors. The LMP8481ASQDGKRQ1 achieves this via internal thin-film resistor networks with matched tempcos.
Does the LMP8481ASQDGKRQ1 support bidirectional current sensing?
Yes, the LMP8481ASQDGKRQ1 explicitly supports bidirectional current sensing through its dual VREFA and VREFB pins. When configured with VREFA = VCC and VREFB = GND, the output zero point is set to VCC/2, allowing positive and negative VSENSE to produce corresponding above/below-mid-scale outputs. This capability is documented in Section 8.3.4 of the datasheet and distinguishes it from unidirectional variants like LMP8480-Q1.
What package type does the LMP8481ASQDGKRQ1 use?
The LMP8481ASQDGKRQ1 uses an 8-pin VSSOP package (DGK), measuring 3.00 mm × 3.00 mm with 0.65 mm lead pitch. This package is specified in TI's orderable addendum and confirmed in the "Device Information" table of SNVSAL6A. It features three NC pins (3, 6, 7) and supports thermal dissipation up to 185°C/W junction-to-ambient - validated for automotive under-hood environments.
How does the LMP8481ASQDGKRQ1 handle high common-mode voltages?
The LMP8481ASQDGKRQ1 accepts common-mode voltages from 4.0 V to 76 V on RSP/RSN inputs while operating from a separate 4.5 V to 76 V supply - a feature enabled by its internal 14-V LDO and precision VCM-sense resistor network. Its 124 dB DC CMRR rejects interference from high-dv/dt sources, and absolute maximum ratings allow safe operation up to 85 V common-mode - verified in Section 7.1 of SNVSAL6A.
Is the LMP8481ASQDGKRQ1 pin-compatible with any legacy devices?
Yes, the LMP8481ASQDGKRQ1 is a pin-for-pin replacement for the MAX4081 series, as stated in TI's datasheet introduction. It shares identical VSSOP-8 pinout (RSP, RSN, VCC, GND, VOUT, REFA, REFB, NC) and offers improved specs: ±80 µV offset vs. ±300 µV, 270 kHz bandwidth vs. 100 kHz, and AEC-Q100 qualification - enabling drop-in upgrades in existing automotive designs without PCB revision.
LMP8481ASQDGKRQ1 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
LMP8481ASQDGKRQ1 FAQ
1.How can I place an order for LMP8481ASQDGKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481ASQDGKRQ1 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 LMP8481ASQDGKRQ1 reliable?
The price and inventory of LMP8481ASQDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8481ASQDGKRQ1 is usually 5 days.
3.What payment methods are accepted for LMP8481ASQDGKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481ASQDGKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481ASQDGKRQ1?
LMP8481ASQDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481ASQDGKRQ1 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 LMP8481ASQDGKRQ1?
For technical support, including LMP8481ASQDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481ASQDGKRQ1 requirements.
6.How does Aetrix verify that LMP8481ASQDGKRQ1 is sourced from the original manufacturer or authorized distributors?
All LMP8481ASQDGKRQ1 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 LMP8481ASQDGKRQ1 meets industry standards.
7.What is the process for return or replacement of LMP8481ASQDGKRQ1?
All LMP8481ASQDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481ASQDGKRQ1, 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 LMP8481ASQDGKRQ1 part is unused and in its original packaging.
Return procedure for LMP8481ASQDGKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8481ASQDGKRQ1 Tags
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