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Texas Instruments LMP8481MME-S/NOPB
- Part No.:
- LMP8481MME-S/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMP8481MME-S/NOPB.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,804
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Product details
Overview
LMP8481MME-S/NOPB from Texas Instruments is a precision bidirectional high-side current sense amplifier with 60V/V fixed gain, 4.0–76V common-mode input range, ±80µV offset, 270kHz bandwidth, and buffered 5mA output drive-used in vehicle battery monitoring, telecom power supplies, and motor control feedback loops.
For engineers reviewing the LMP8481MME-S/NOPB datasheet, LMP8481MME-S/NOPB pinout, LMP8481MME-S/NOPB application, or LMP8481MME-S/NOPB equivalent, this page delivers verified specifications, VSSOP-8 pin mapping, real-world use cases, and two validated alternative parts for automotive-grade current sensing designs requiring stable zero-reference operation and wide supply compatibility.
Technical Context
The LMP8481MME-S/NOPB implements a two-stage architecture: first, a precision thin-film resistor-based voltage-to-current converter converts differential sense voltage (VSENSE) into imbalanced currents; second, a differential amplifier with internal 14V LDO and level-shifting output stage applies fixed 60× gain and sums user-defined reference voltage applied to REFA/REFB pins.
Unlike unidirectional LMP8480 variants, the LMP8481MME-S/NOPB supports true bidirectional sensing via externally configurable reference inputs-enabling mid-scale zero-point alignment (e.g., VCC/2 or ADC reference/2) and polarity-aware output swing from 3mV to VCC–230mV, all while operating from supply voltages as low as 4.5V even when monitoring 76V loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60 V/V - fixed ratio enables direct current calculation without external gain-setting resistors; supports ±0.8% error over –40°C to 125°C. |
| Input Offset Voltage | ±80 µV typical - allows use of smaller shunt resistors (e.g., 1 mΩ) without compromising low-current accuracy in battery management. |
| Common-Mode Range | 4.0 V to 76 V - permits direct connection to high-voltage bus rails without level-shifting circuitry or auxiliary supplies. |
| Bandwidth | 270 kHz - sufficient for fast transient detection in motor phase current or telecom DC-DC converter loop response. |
| Output Drive | >5 mA sourcing/sinking - directly interfaces with ADC inputs, comparators, or microcontroller GPIOs without buffer amplifiers. |
| PSRR / CMRR | 122 dB / 124 dB (DC) - rejects supply noise and common-mode transients critical in noisy automotive or industrial environments. |
| Quiescent Current | <100 µA - enables always-on current monitoring in energy-constrained systems like solar charge controllers. |
Pinout & Package
Package: 8-pin VSSOP (3.00 mm × 3.00 mm), RoHS-compliant, surface-mountable with exposed thermal pad (DGK suffix).
| 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; requires Kelvin routing for accuracy. |
| 2 - VCC | Positive supply voltage | Accepts 4.5–76V; powers internal 14V LDO and amplifier stages; may be tied to monitored rail to eliminate auxiliary supply. |
| 3 - NC | No connection | Not internally bonded; must remain floating per TI design guidelines to avoid parasitic coupling. |
| 4 - GND | Ground reference | Analog ground return; separate from power ground in layout to minimize noise injection into sensitive inputs. |
| 5 - VOUT | Voltage output | Buffered rail-to-rail capable output (3mV min, VCC–230mV max); drives 100kΩ loads with <0.1Ω output impedance. |
| 6 - REFB | Reference voltage "B" input | One leg of internal 100kΩ resistor divider; sets output zero point when paired with REFA (e.g., grounded for unidirectional mode). |
| 7 - REFA | Reference voltage "A" input | Second leg of internal 100kΩ divider; configures bidirectional offset (e.g., tied to VCC for VCC/2 zero point). |
| 8 - RSN | Negative current sense input | Connects to low-side of shunt; maintains >4V above GND for valid operation; same voltage rating as RSP. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing support | REFA/REFB pins enable programmable zero-reference output (GND, VCC/2, or external VREF/2), allowing accurate current direction detection in H-bridge motor drivers. |
| Supply-common-mode independence | VCC can be 4.5V while monitoring 76V load-eliminates need for isolated DC-DC converter or charge pump in high-voltage systems. |
| High-accuracy fixed gain | ±0.1% gain accuracy at 25°C and ±0.8% over full temperature range reduces calibration burden in production test and field firmware. |
| Low input bias current | 7 µA max per input minimizes error from shunt resistor parallel leakage, especially critical with high-value (>100mΩ) sense resistors. |
| Robust ESD protection | ±2000V HBM rating ensures reliability during PCB handling and system integration without additional TVS components. |
Applications
| Vehicle Battery Monitoring | Telecom Power Supply Sensing |
|---|---|
|
Use Scenario: Real-time measurement of charge/discharge current in 12V/48V automotive battery systems with cold-cranking and load-dump transients. IC Role / Device Role / Timing Role: High-side current sense amplifier converting mV-level shunt voltage to calibrated 0–3V analog output for MCU ADC sampling at 10kHz. Use Value: ±80µV offset and 124dB CMRR reject alternator ripple and ignition noise, enabling sub-1% current accuracy across –40°C to 125°C. |
Use Scenario: Input/output current monitoring in -48V telecom rectifier modules and distributed power architectures. IC Role / Device Role / Timing Role: Bidirectional current sensor interfacing with isolated ADC via REFA/REFB-referenced output aligned to system VREF. Use Value: 4.0–76V common-mode range accommodates wide input voltage swings; 270kHz bandwidth captures fast overcurrent events before protection triggers. |
| Motor Phase Current Feedback | Solar Panel String Monitoring |
|
Use Scenario: Closed-loop current control in BLDC motor inverters where phase current direction determines commutation timing. IC Role / Device Role / Timing Role: High-side sense amplifier with VCC/2 zero reference feeding analog input of motor control MCU for real-time torque regulation. Use Value: Bidirectional capability enables precise zero-crossing detection; 5mA output drive eliminates need for op-amp buffers in noisy motor drive environments. |
Use Scenario: Per-string current measurement in photovoltaic combiner boxes to detect partial shading or panel failure. IC Role / Device Role / Timing Role: Unidirectional current monitor (REFB grounded, REFA = GND) reporting string current to central controller via isolated RS-485 interface. Use Value: <100µA quiescent current extends daytime-only monitoring runtime; 76V common-mode rating covers open-circuit voltage of 60-cell strings. |
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 |
|---|---|---|---|
| MAX4081ASA+T | 60V/V gain, ±200µV offset, 150kHz bandwidth, no REFA/REFB pins - unidirectional only. | Lacks bidirectional zero-reference flexibility; requires external op-amp for mid-scale offset if used in H-bridge feedback. | Select when cost sensitivity outweighs need for programmable reference and higher bandwidth is not required. |
| INA240A1D | 20V/V gain, ±20µV offset, 400kHz bandwidth, integrated 2.5V reference, no REFA/REFB - unidirectional with internal reference. | Fixed 2.5V reference limits output swing range; higher bandwidth but lower gain necessitates larger shunt for same resolution. | Select when ultra-low offset dominates design priority and bidirectional sensing is unnecessary. |
Compared with MAX4081ASA+T and INA240A1D, the LMP8481MME-S/NOPB uniquely combines 60V/V gain, bidirectional reference configurability, and 270kHz bandwidth in a single VSSOP-8 package-making it optimal for space-constrained, multi-mode current sensing where output zero-point adaptability is essential.
Availability
LMP8481MME-S/NOPB is available at Aetrix Electronics and suitable for vehicle battery monitoring, telecom power supply sensing, and motor phase current feedback requiring stable component supply across automotive, industrial, and renewable energy programs.
Supply support for LMP8481MME-S/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 signal conditioning and high-reliability power management ICs.
The LMP8481MME-S/NOPB belongs to TI's LMP848x family of high-voltage current sense amplifiers, engineered specifically for accurate, robust, and flexible current measurement in automotive, telecom, and industrial systems where supply and common-mode voltages exceed standard op-amp limits.
FAQ
What is the maximum common-mode voltage the LMP8481MME-S/NOPB can handle?
The LMP8481MME-S/NOPB supports a common-mode input voltage range of 4.0 V to 76 V, with absolute maximum ratings up to 85 V on RSP and RSN pins. This allows direct connection to high-voltage rails such as 48V telecom systems or 72V EV battery packs without external level-shifting circuitry. Operation remains valid across the full –40°C to 125°C temperature range within these limits.
Can the LMP8481MME-S/NOPB be used for bidirectional current sensing?
Yes-the LMP8481MME-S/NOPB is explicitly designed for bidirectional sensing via its REFA and REFB pins. When configured with appropriate reference voltages (e.g., REFA = VCC, REFB = GND), the output centers at VCC/2, enabling positive current to produce output above mid-scale and negative current below it. This functionality is intrinsic to the LMP8481MME-S/NOPB and distinguishes it from unidirectional variants like the LMP8480.
What is the purpose of the REFA and REFB pins on the LMP8481MME-S/NOPB?
The REFA and REFB pins on the LMP8481MME-S/NOPB form an internal resistor divider that sets the output zero-reference voltage. Their configuration determines whether the output is ground-referenced (both pins grounded), mid-scale referenced (REFA = VCC, REFB = GND), or externally referenced (both tied to VREF). This enables flexible interfacing with ADCs, comparators, or microcontrollers requiring specific input voltage ranges-without external op-amps or level-shifters.
Does the LMP8481MME-S/NOPB require an external power supply separate from the monitored rail?
No-the LMP8481MME-S/NOPB operates from a supply voltage range of 4.5 V to 76 V, fully overlapping its 4.0–76 V common-mode input range. It can therefore be powered directly from the same rail being monitored (e.g., VCC tied to battery voltage), eliminating the need for auxiliary supplies, isolated DC-DC converters, or charge pumps-reducing BOM count and board area in high-voltage applications.
How does the LMP8481MME-S/NOPB compare to the LMP8480 series in terms of functionality?
The LMP8481MME-S/NOPB adds bidirectional sensing capability via REFA/REFB pins, whereas the LMP8480 series has those pins internally grounded and supports only unidirectional operation. Both share identical gain options (20/60/100 V/V), offset, bandwidth, and package-but only the LMP8481MME-S/NOPB enables programmable zero-reference output, making it suitable for H-bridge motor control, regenerative braking, and other polarity-sensitive current measurements.
LMP8481MME-S/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
LMP8481MME-S/NOPB FAQ
1.How can I place an order for LMP8481MME-S/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8481MME-S/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 LMP8481MME-S/NOPB reliable?
The price and inventory of LMP8481MME-S/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8481MME-S/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8481MME-S/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8481MME-S/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8481MME-S/NOPB?
LMP8481MME-S/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8481MME-S/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 LMP8481MME-S/NOPB?
For technical support, including LMP8481MME-S/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8481MME-S/NOPB requirements.
6.How does Aetrix verify that LMP8481MME-S/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8481MME-S/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 LMP8481MME-S/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8481MME-S/NOPB?
All LMP8481MME-S/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8481MME-S/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 LMP8481MME-S/NOPB part is unused and in its original packaging.
Return procedure for LMP8481MME-S/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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