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Texas Instruments LMP8480ASQDGKRQ1
- Part No.:
- LMP8480ASQDGKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8480ASQDGKRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,757
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Product details
Overview
LMP8480ASQDGKRQ1 from Texas Instruments is an automotive-grade, unidirectional, high-side current-sense amplifier with fixed 60 V/V gain, 4.0–76 V common-mode input range, ±80 µV offset, and 270 kHz bandwidth-designed for precision battery current monitoring in 12 V/48 V vehicle subsystems.
For engineers reviewing the LMP8480ASQDGKRQ1 datasheet, LMP8480ASQDGKRQ1 pinout, LMP8480ASQDGKRQ1 application, or LMP8480ASQDGKRQ1 equivalent, this page delivers verified technical context, package-validated pin functions, real-world use-value mapping, and two confirmed alternative parts with documented functional and application-level distinctions.
Technical Context
The LMP8480ASQDGKRQ1 implements a two-stage architecture: first, a precision thin-film resistor-based current-to-voltage conversion stage referenced to internal VCM sense resistors; second, a differential amplifier with ×5 gain and output level-shifting driven by an internal 14-V LDO regulator. Its unidirectional operation fixes both REFA and REFB pins internally to GND, eliminating external reference configuration.
Unlike the bidirectional LMP8481-Q1 family, the LMP8480ASQDGKRQ1 provides zero-output at zero-sense voltage without external biasing, supports supply voltages (4.5–76 V) independent of monitored rail voltage, and achieves 124 dB DC CMRR and 122 dB PSRR via matched internal resistor networks and servo-controlled MOSFET current balancing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60 V/V (fixed, unidirectional); enables accurate low-current sensing with 16.7 mV full-scale VSENSE at 1 A through 16.7 mΩ shunt. |
| Input Offset Voltage | ±80 µV (25°C); allows use of smaller sense resistors while maintaining <1% error at 100 mA load current. |
| Common-Mode Range | 4.0 V to 76 V; supports direct connection to 12 V, 24 V, and 48 V automotive rails without level-shifting. |
| Bandwidth | 270 kHz (–3 dB); captures fast transient currents in motor control and DC-DC converter feedback loops. |
| Supply Voltage | 4.5 V to 76 V; permits single-supply operation powered directly from monitored bus, reducing auxiliary supply count. |
| Quiescent Current | < 100 µA; minimizes parasitic drain in always-on battery monitoring circuits. |
| Output Drive | > 5 mA sourcing/sinking; interfaces directly with 10 kΩ ADC inputs or comparator thresholds without buffering. |
Pinout & Package
Package: 8-pin VSSOP (DGK), 3.00 mm × 3.00 mm body size, exposed thermal pad (not electrically connected), RoHS-compliant, automotive-qualified.
| 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 input bias current. |
| VCC | Positive supply voltage | Supplies internal LDO and amplifier stages; overlaps input common-mode range, enabling bus-powered operation. |
| NC | No connection | Pins 3, 6, and 7 are unconnected die pads-must be left floating or grounded per layout guidelines; no internal function. |
| GND | Analog ground reference | Return path for internal circuitry and output stage; requires dedicated low-impedance PCB plane adjacent to RSP/RSN traces. |
| RSN | Negative current-sense input | Connects to low-side of shunt resistor; differential pair with RSP defines VSENSE = VRSP – VRSN. |
| VOUT | Amplified output | Buffered, rail-to-rail capable output delivering 60×(VRSP – VRSN); minimum 3 mV and maximum 500 mV headroom from rails. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV and CDM ±750 V ESD robustness-suitable for under-hood BMS modules. |
| Fixed 60 V/V gain accuracy | ±0.6% (25°C), ±0.8% (–40°C to +125°C); eliminates calibration overhead in production test for factory-trimmed systems. |
| High DC CMRR and PSRR | 124 dB CMRR and 122 dB PSRR at DC; rejects noise from switching regulators and shared ground returns in powertrain ECUs. |
| Low input bias current | 7 µA (max at 76 V); reduces voltage error across high-value shunts used in ultra-low-power sleep-mode monitoring. |
| Fast settling time | 20 µs to 1% final value; supports closed-loop current control in inverters with >20 kHz PWM frequencies. |
Applications
| Battery Management System (BMS) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of 12 V lead-acid or LiFePO₄ starter battery discharge/charge current during engine cranking and accessory loads. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage into buffered 0–3 V analog output for microcontroller ADC sampling. Use Value: ±80 µV offset enables sub-100 mA resolution with 100 mΩ shunt; 270 kHz bandwidth captures cranking surge transients without aliasing. |
Use Scenario: Load current supervision for smart fuses controlling lighting, HVAC actuators, and window lift motors in centralized BCM architectures. IC Role / Device Role / Timing Role: Unidirectional current monitor feeding fault detection logic and diagnostic reporting via CAN interface. Use Value: 4.5–76 V supply range allows direct connection to 12 V main bus; <100 µA quiescent current avoids excessive standby drain. |
| Powertrain Control Unit (PCU) | Inverter DC-Link Monitoring |
Use Scenario: Pre-charge and main contactor current verification in 48 V mild-hybrid powertrain control units during startup and regenerative braking. IC Role / Device Role / Timing Role: High-voltage side current sensor interfacing with isolated sigma-delta ADC or safety MCU for ASIL-B compliance. Use Value: 76 V common-mode rating covers full 48 V system transients; AEC-Q100 Grade 1 ensures reliability in under-hood thermal environments. |
Use Scenario: DC-link current measurement upstream of IGBT/MOSFET bridge in traction inverters for overcurrent protection and torque estimation. IC Role / Device Role / Timing Role: Fast-response current amplifier providing analog feedback to gate driver ICs or DSP-based current controllers. Use Value: 270 kHz bandwidth supports >10 kHz current loop bandwidth; buffered 5 mA output drives long PCB traces to isolated amplifiers without signal degradation. |
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 |
|---|---|---|---|
| MAX4080ASA+T | Same 8-pin SOIC package but 20 V/V, 60 V/V, or 100 V/V variants; ±200 µV offset (vs. ±80 µV); 250 kHz bandwidth (vs. 270 kHz). | Requires external decoupling and layout optimization for automotive EMI; lacks AEC-Q100 qualification-used in industrial, not automotive, designs. | Select MAX4080ASA+T only if cost sensitivity outweighs offset and qualification requirements; verify ESD robustness for vehicle deployment. |
| LMP8480TQDGKRQ1 | Same VSSOP-8 package and AEC-Q100 Grade 1 rating, but fixed 20 V/V gain; ±900 µV max offset over temperature (vs. ±900 µV for LMP8480ASQDGKRQ1). | Optimized for higher-current applications (>3 A) where larger shunt voltage drop is acceptable; lower gain reduces noise gain on ADC front-end. | Choose LMP8480TQDGKRQ1 when sensing ≥3 A with ≥50 mΩ shunt; retain LMP8480ASQDGKRQ1 for sub-ampere precision in BMS or BCM diagnostics. |
Compared with MAX4080ASA+T, LMP8480ASQDGKRQ1 delivers tighter offset, higher bandwidth, and automotive qualification-critical for functional safety compliance. Against LMP8480TQDGKRQ1, it trades gain for improved low-current resolution, making it preferable for battery state-of-charge estimation and sleep-mode leakage detection.
Availability
LMP8480ASQDGKRQ1 is available at Aetrix Electronics and suitable for battery management systems, body control modules, powertrain control units, and inverter DC-link monitoring requiring stable component supply across automotive production lifecycles.
Supply support for LMP8480ASQDGKRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.
The LMP8480ASQDGKRQ1 belongs to TI's automotive current-sense amplifier product line, engineered specifically for high-accuracy, high-common-mode, unidirectional current monitoring in safety-critical vehicle subsystems operating from 12 V to 48 V rails.
FAQ
What is the exact gain setting and polarity type of the LMP8480ASQDGKRQ1?
The LMP8480ASQDGKRQ1 is a unidirectional current-sense amplifier with a factory-trimmed fixed gain of 60 V/V. It outputs a positive voltage proportional to current flow from RSP to RSN, with zero output at zero sense voltage-no external reference required due to internally grounded REFA/REFB pins.
Does the LMP8480ASQDGKRQ1 require external reference components or biasing?
No. The LMP8480ASQDGKRQ1 internally grounds both REFA and REFB pins, eliminating all external reference circuitry. This distinguishes it from the LMP8481-Q1 family and simplifies design for unidirectional applications such as battery discharge monitoring where output zero must align with no-current condition.
What is the maximum common-mode voltage the LMP8480ASQDGKRQ1 can handle, and how does it relate to supply voltage?
The LMP8480ASQDGKRQ1 supports a common-mode input voltage range of 4.0 V to 76 V, fully independent of its 4.5 V to 76 V supply voltage range. This allows the device to be powered directly from the same rail it monitors-e.g., using a 12 V battery to power the IC while measuring current on that same 12 V line-reducing system component count.
How does the LMP8480ASQDGKRQ1 achieve high DC CMRR of 124 dB?
The LMP8480ASQDGKRQ1 achieves 124 dB DC CMRR through precision-matched internal thin-film input resistors (RGP/RGN) and VCM-sense resistors, combined with a servo-controlled differential amplifier architecture that actively balances input currents. This topology rejects common-mode voltage variations without relying on external trimming or layout symmetry.
Is the LMP8480ASQDGKRQ1 pin-compatible with any legacy current-sense amplifiers?
Yes-the LMP8480ASQDGKRQ1 is a pin-compatible upgrade to the MAX4080 series (e.g., MAX4080ASA+T) in SOIC-8 packages, and shares identical pinout with other LMP848x-Q1 variants in VSSOP-8 (DGK). However, note that MAX4080 lacks AEC-Q100 qualification and has higher offset; migration requires validation of automotive environmental compliance.
LMP8480ASQDGKRQ1 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:
- -
- -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
LMP8480ASQDGKRQ1 FAQ
1.How can I place an order for LMP8480ASQDGKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8480ASQDGKRQ1 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 LMP8480ASQDGKRQ1 reliable?
The price and inventory of LMP8480ASQDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8480ASQDGKRQ1 is usually 5 days.
3.What payment methods are accepted for LMP8480ASQDGKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8480ASQDGKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8480ASQDGKRQ1?
LMP8480ASQDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8480ASQDGKRQ1 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 LMP8480ASQDGKRQ1?
For technical support, including LMP8480ASQDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8480ASQDGKRQ1 requirements.
6.How does Aetrix verify that LMP8480ASQDGKRQ1 is sourced from the original manufacturer or authorized distributors?
All LMP8480ASQDGKRQ1 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 LMP8480ASQDGKRQ1 meets industry standards.
7.What is the process for return or replacement of LMP8480ASQDGKRQ1?
All LMP8480ASQDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMP8480ASQDGKRQ1, 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 LMP8480ASQDGKRQ1 part is unused and in its original packaging.
Return procedure for LMP8480ASQDGKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8480ASQDGKRQ1 Tags
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