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Texas Instruments LMP8481MM-H/NOPB
- Part No.:
- LMP8481MM-H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481MM-H/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,071
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Product details
Overview
LMP8481MM-H/NOPB from Texas Instruments is a precision bidirectional high-side current sense amplifier with fixed 100V/V gain, 76V common-mode input range (4.0V to 76V), ±80µV max input offset, and 270kHz bandwidth - deployed in vehicle battery monitoring, telecom power supplies, and industrial motor control where accurate bidirectional load current measurement under high-voltage conditions is required.
For engineers reviewing the LMP8481MM-H/NOPB datasheet, LMP8481MM-H/NOPB pinout, LMP8481MM-H/NOPB application, or LMP8481MM-H/NOPB equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for high-side sensing designs operating up to 76V with sub-millivolt offset stability.
Technical Context
The LMP8481MM-H/NOPB implements a two-stage architecture: first, a precision thin-film resistor-based voltage-to-current converter converts differential sense voltage (VSENSE) into imbalanced input currents; second, a differential amplifier with internal 14V LDO and level-shifting output stage applies fixed 100× gain and sums the result with user-configurable reference voltage applied to VREFA/VREFB pins.
This architecture enables true bidirectional operation - output polarity reverses with current direction - while maintaining DC CMRR of 124dB and PSRR of 122dB, and supports direct connection to ADCs via programmable zero-reference (GND, VCC/2, or external VREF/2) without external op-amps or level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 100V/V - enables precise scaling of small shunt voltages (e.g., 10mV → 1V output) without external gain-setting components. |
| Input Offset Voltage | ±80µV max at 25°C - allows use of higher-value, lower-power shunt resistors (e.g., 10mΩ instead of 5mΩ) without sacrificing low-current accuracy. |
| Common-Mode Range | 4.0V to 76V - supports direct sensing on 12V, 24V, 48V, and 72V bus systems without level-shifting circuitry. |
| Bandwidth | 270kHz (–3dB) - captures fast transient currents in motor commutation, LED dimming, or fault detection within µs response time. |
| Supply Voltage Range | 4.5V to 76V - permits single-supply operation powered directly from monitored rail (e.g., 48V bus powers device), eliminating auxiliary supply. |
| Output Drive | >5mA sourcing/sinking - drives 10kΩ ADC inputs or long traces without buffer amplifiers. |
| Quiescent Current | <100µA - suitable for always-on battery-monitoring circuits with minimal standby power impact. |
Pinout & Package
Package: 8-pin VSSOP (DGK), 3.00mm × 3.00mm body size, exposed thermal pad not present - compatible with standard surface-mount reflow profiles and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RSP | Positive current sense input | Connects to high-side of shunt resistor; withstands up to 85V absolute max; forms differential pair with RSN. |
| 2 - VCC | Positive supply voltage | Accepts 4.5V–76V supply; powers internal 14V LDO and analog core; may be tied to monitored rail. |
| 3 - NC | No connection | Not internally bonded; must remain unconnected per TI design - floating or grounded both violate layout guidelines. |
| 4 - GND | Analog ground reference | Return path for VCC and output stage; requires low-impedance connection to system ground plane near shunt. |
| 5 - VOUT | Voltage output | Buffered rail-to-rail capable output (min 3mV, max VCC–230mV); drives ≥10kΩ loads directly into ADC or comparator. |
| 6 - REFB | Reference voltage "B" input | One leg of internal 100kΩ resistor divider; sets output zero point when paired with VREFA (e.g., GND + VCC → VCC/2). |
| 7 - REFA | Reference voltage "A" input | Second leg of internal 100kΩ divider; determines VREF′ = (VREFA + VREFB)/2 - defines output offset independent of gain. |
| 8 - RSN | Negative current sense input | Connects to low-side of shunt; common-mode voltage matches RSP; differential input rejects bus noise above 124dB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Output polarity reverses with current direction - enables charge/discharge monitoring in battery management without polarity-switching circuitry. |
| Programmable output reference | VREFA/VREFB pins allow GND-, VCC/2-, or external VREF/2-referenced outputs - eliminates need for external bias networks in bipolar ADC interfacing. |
| High-voltage common-mode tolerance | Operates with 4.0V–76V input common-mode range - supports direct placement at point-of-load on 48V telecom or 72V EV subsystems. |
| Low quiescent current & wide supply range | <100µA ICC across 4.5V–76V supply - enables self-powered operation on same rail being measured, reducing BOM count by one regulator. |
| Integrated 14V LDO regulation | Stabilizes internal analog core against supply ripple - maintains 270kHz bandwidth and 122dB PSRR even with noisy 48V bus input. |
Applications
| Automotive Battery Monitoring | Telecom 48V Power System |
|---|---|
|
Use Scenario: Real-time bidirectional current tracking in 12V/48V mild-hybrid vehicle battery packs during regenerative braking and engine cranking. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to buffered analog output for MCU ADC sampling at 10ksps. Use Value: ±80µV offset enables <1% error down to 5A with 2mΩ shunt; 76V CM range accommodates load-dump transients up to 65V. |
Use Scenario: Input current supervision in distributed telecom power shelves with hot-swap controllers and OR-ing FETs. IC Role / Device Role / Timing Role: Precision current monitor feeding fault logic and telemetry to baseband controller via isolated analog interface. Use Value: 270kHz bandwidth detects fast overcurrent events (<5µs rise time); 124dB CMRR rejects switching noise from adjacent DC/DC converters. |
| Industrial Motor Drive Feedback | Solar Array String Monitoring |
|
Use Scenario: Phase current sensing in BLDC inverter half-bridges for field-oriented control (FOC) in HVAC compressors and pumps. IC Role / Device Role / Timing Role: High-side amplifier providing isolated current feedback signal to gate driver IC or isolation amplifier input. Use Value: Fixed 100V/V gain ensures consistent scaling across production units; >5mA output drives 100Ω isolation barrier inputs directly. |
Use Scenario: Per-string current measurement in utility-scale solar farms with 1000V+ PV arrays and string-level MPPT optimization. IC Role / Device Role / Timing Role: High-common-mode amplifier interfaced to string combiner box telemetry unit for I-V curve tracing. Use Value: 4.0V–76V CM range covers open-circuit voltage drift across temperature; ±0.1% gain accuracy preserves MPPT algorithm fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4081TASA+ | Fixed 20V/V gain; ±100µV offset; 200kHz bandwidth; no VREF pins - unidirectional only. | Limited to unidirectional sensing; requires external level-shifting for bipolar ADCs; lower bandwidth restricts fast transient capture. | Select only if 20× gain suffices and bidirectionality is unnecessary - avoids VREF configuration complexity. |
| INA240A1QDRQ1 | 100V/V gain; ±20µV offset; 400kHz bandwidth; integrated EMI filtering; AEC-Q100 qualified. | Superior offset and speed; automotive-grade qualification; wider –40°C to 125°C spec compliance; no VREF flexibility. | Prefer for automotive safety-critical systems requiring AEC-Q100; trade VREF configurability for tighter offset and higher bandwidth. |
Compared with MAX4081TASA+, LMP8481MM-H/NOPB provides bidirectional operation and programmable reference but trades 200kHz bandwidth for 270kHz. Against INA240A1QDRQ1, it offers flexible VREF biasing at the cost of higher offset and absence of AEC-Q100 certification - making it optimal for industrial/commercial systems prioritizing configurability over automotive qualification.
Availability
LMP8481MM-H/NOPB is available at Aetrix Electronics and suitable for automotive battery monitoring, telecom 48V power systems, and industrial motor control requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for LMP8481MM-H/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 delivering analog, embedded processing, and connectivity solutions with deep expertise in precision signal chain and power management ICs.
The LMP8481MM-H/NOPB belongs to TI's LMP848x family of high-voltage current sense amplifiers, designed specifically for accurate bidirectional current measurement in automotive, industrial, and telecom systems where high common-mode voltage, low offset, and flexible output referencing are critical.
FAQ
What is the maximum differential input voltage supported by the LMP8481MM-H/NOPB?
The LMP8481MM-H/NOPB supports a maximum differential input voltage (VSENSE) of 133mV at full temperature range (–40°C to 125°C) for the H-gain version. This value is derived from the gain of 100V/V and the specified output headroom - ensuring linear operation without saturation when used with appropriately sized shunt resistors. Exceeding 133mV risks clipping and measurement error.
Can the LMP8481MM-H/NOPB be used for low-side current sensing?
No, the LMP8481MM-H/NOPB is not suitable for low-side current sensing. Its input common-mode voltage must remain ≥4.0V above GND for proper operation; below this threshold, input stage biasing fails and output becomes invalid. For low-side applications, dedicated low-side amplifiers like the INA199 or TLV2170 are recommended instead.
How does the VREFA/VREFB configuration affect the output of the LMP8481MM-H/NOPB?
On the LMP8481MM-H/NOPB, VREFA and VREFB set the output zero-reference level as VREF′ = (VREFA + VREFB)/2. Grounding both pins yields 0V output at zero current (unidirectional mode). Tying VREFA to VCC and VREFB to GND produces VCC/2 output at zero current - ideal for bipolar ADC interfacing. Using external references enables custom mid-scale offsets aligned to system-specific ADC ranges.
Is the LMP8481MM-H/NOPB pin-compatible with the MAX4081 series?
Yes, the LMP8481MM-H/NOPB is a pin-for-pin replacement for the MAX4081 series in VSSOP-8 packages. However, functional differences exist: the LMP8481MM-H/NOPB adds VREFA/VREFB pins (NC on MAX4081), enabling bidirectional operation and programmable reference, whereas MAX4081 is unidirectional-only. Layout reuse is possible, but VREF pins must be properly terminated per application.
What is the thermal resistance (θJA) of the LMP8481MM-H/NOPB in its VSSOP package?
The LMP8481MM-H/NOPB in the 8-pin VSSOP (DGK) package has a junction-to-ambient thermal resistance (θJA) of 185°C/W under standard JEDEC test conditions. This value assumes a 2-layer board with no thermal vias; actual performance improves significantly with copper pour, thermal vias under the pad, and airflow - critical for sustained operation near 76V supply with >100µA quiescent current.
LMP8481MM-H/NOPB 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMP8481MM-H/NOPB FAQ
1.How can I place an order for LMP8481MM-H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481MM-H/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 LMP8481MM-H/NOPB reliable?
The price and inventory of LMP8481MM-H/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8481MM-H/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8481MM-H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481MM-H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481MM-H/NOPB?
LMP8481MM-H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481MM-H/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 LMP8481MM-H/NOPB?
For technical support, including LMP8481MM-H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481MM-H/NOPB requirements.
6.How does Aetrix verify that LMP8481MM-H/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8481MM-H/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 LMP8481MM-H/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8481MM-H/NOPB?
All LMP8481MM-H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481MM-H/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 LMP8481MM-H/NOPB part is unused and in its original packaging.
Return procedure for LMP8481MM-H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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