Texas Instruments LMP8480MM-T/NOPB

Overview

LMP8480MM-T/NOPB from Texas Instruments is a unidirectional high-side current sense amplifier with 20V/V fixed gain, 4.0V–76V common-mode input range, ±80µV offset, 270kHz bandwidth, and VSSOP-8 package. It enables precision current monitoring in automotive battery management, telecom power supplies, and industrial motor drives where supply voltage matches monitored rail.

For engineers reviewing the LMP8480MM-T/NOPB datasheet, LMP8480MM-T/NOPB pinout, LMP8480MM-T/NOPB application, or LMP8480MM-T/NOPB equivalent, key selection criteria include unidirectional sensing capability, 20× gain accuracy (±0.6% at 25°C), output drive >5mA, PSRR of 122dB, and compatibility with 4.5V–76V single-supply operation without intermediate rails.

Technical Context

The LMP8480MM-T/NOPB implements a two-stage architecture: first, a precision thin-film resistor-based voltage-to-current converter referenced to input common-mode voltage; second, a differential amplifier with ×5 gain and level-shifting output stage powered by an internal 14V LDO. Its input stage uses matched RGP/RGN resistors (98.38kΩ for 20× gain) and VCM-sense resistors to reject common-mode variations.

Unlike bidirectional variants, the LMP8480MM-T/NOPB internally grounds both VREF pins, fixing output zero at GND-eliminating external reference components and simplifying unidirectional designs. Its supply voltage (4.5V–76V) operates independently of input common-mode range (4.0V–76V), enabling direct connection to the monitored rail.

Key Specifications

Pinout & Package

Package: VSSOP-8 (3.00mm × 3.00mm), thermally enhanced for high-voltage industrial use.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current sensing applications.

Compared with MAX4080TASA+ and LMP8601QMA/NOPB, the LMP8480MM-T/NOPB delivers superior input offset (±80µV vs ±100/150µV) and higher CMRR (124dB), making it optimal for precision industrial and telecom current sensing where low-error baseline performance is critical.

Availability

LMP8480MM-T/NOPB is available at Aetrix Electronics and suitable for automotive battery monitoring, telecom power supply sensing, and industrial motor drive feedback requiring stable component supply across extended temperature ranges and high-voltage operation.

Supply support for LMP8480MM-T/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 for industrial, automotive, and communications markets.

The LMP8480MM-T/NOPB belongs to TI's precision current sense amplifier product line, engineered specifically for high-voltage, high-accuracy unidirectional current monitoring in safety-critical power systems.

FAQ

What is the maximum common-mode voltage supported by the LMP8480MM-T/NOPB?

The LMP8480MM-T/NOPB supports a common-mode input voltage range of 4.0V to 76V. This allows it to accurately monitor current on 12V, 24V, 48V, and 72V power rails-including automotive cold-crank and telecom surge conditions-without external level-shifting circuitry. The device remains functional even when the input common-mode voltage exceeds the supply voltage (VCC), provided VCC stays within its 4.5V–76V rating.

Does the LMP8480MM-T/NOPB support bidirectional current sensing?

No, the LMP8480MM-T/NOPB is strictly unidirectional. Its internal VREF pins are grounded, fixing the output zero point at GND. For bidirectional applications requiring positive/negative current indication (e.g., regenerative braking), the LMP8481 variant must be used instead. Attempting to force bidirectional behavior on the LMP8480MM-T/NOPB will result in clipped negative output and measurement errors.

What is the gain accuracy specification for the LMP8480MM-T/NOPB over temperature?

The LMP8480MM-T/NOPB has a gain accuracy of ±0.6% at TA = 25°C and ±0.8% over the full –40°C to +125°C operating temperature range. This tight tolerance is achieved through laser-trimmed thin-film resistors and is specified for the 20V/V gain version (denoted by "T" suffix). It ensures consistent scaling from shunt voltage to output across automotive and industrial thermal environments.

Can the LMP8480MM-T/NOPB be powered directly from the monitored voltage rail?

Yes-the LMP8480MM-T/NOPB supports supply voltages from 4.5V to 76V, fully overlapping its 4.0V–76V common-mode input range. This allows VCC to be connected directly to the same rail being sensed (e.g., 48V battery bus), eliminating the need for an auxiliary supply and reducing system complexity, component count, and board space-especially valuable in compact power modules.

What is the purpose of the NC pins (pins 3, 6, and 7) on the LMP8480MM-T/NOPB?

Pins 3 (NC), 6 (NC), and 7 (NC) on the LMP8480MM-T/NOPB are not internally connected and must remain unconnected in the PCB layout. Pin 6 and pin 7 correspond to REFB and REFA on the pin-compatible LMP8481-but are permanently grounded inside the LMP8480MM-T/NOPB die. Leaving them floating avoids unintended coupling or ESD paths, and aligns with TI's recommended layout practices for VSSOP-8 current sense amplifiers.