Texas Instruments LMP8603QMM/NOPB

Overview

LMP8603QMM/NOPB from Texas Instruments is a precision bidirectional current-sense amplifier with fixed 100× gain, –22V to +60V input common-mode voltage range at 5V supply, 90dB minimum CMRR, ±1mV max input offset voltage, and in-line filter capability via A1/A2 pins for signal conditioning in high-noise industrial power systems.

For engineers reviewing the LMP8603QMM/NOPB datasheet, LMP8603QMM/NOPB pinout, LMP8603QMM/NOPB application, or LMP8603QMM/NOPB equivalent, key selection criteria include single-supply bidirectional operation, ±10μV/°C TCVOS, 60kHz bandwidth, 0.83V/μs slew rate, and compatibility with shunt-based current monitoring in DC/DC converters, motor drives, and server power supplies.

Technical Context

The LMP8603QMM/NOPB implements a two-stage architecture: a chopping-level-shift preamplifier (gain = 10×, ±1mV V_OS, 100kΩ internal R_F-INT) followed by a buffered output stage (gain = 10×), enabling precise amplification of millivolt-level shunt voltages under extreme common-mode conditions. Its input resistors protect against large differential fault voltages while maintaining high impedance (≥500kΩ differential, ≥250kΩ common-mode).

Operation supports both unidirectional and bidirectional sensing via the OFFSET pin, which sets output mid-scale for bipolar current flow. The A1 and A2 terminals provide direct access to the preamplifier output and buffer input, allowing external RC filtering or gain adjustment without compromising accuracy or stability.

Key Specifications

Pinout & Package

DGK package: 8-pin VSSOP, 3.00mm × 4.90mm body, exposed thermal pad (not electrically connected), RoHS-compliant, lead-free (NOPB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA240A1QDGKRQ1 and MAX40056ATA+T, the LMP8603QMM/NOPB uniquely provides 100× fixed gain with accessible A1/A2 nodes for custom filtering and true single-supply bidirectional sensing-critical for server VRM telemetry and precision motion control where gain accuracy and signal conditioning flexibility outweigh raw noise performance.

Availability

LMP8603QMM/NOPB is available at Aetrix Electronics and suitable for DC/DC converter monitoring, Intel server VRM current sensing, linear motor power stage control, field transmitter diagnostics, and scientific instrumentation requiring stable component supply and long-term production continuity.

Supply support for LMP8603QMM/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 amplifiers and power management ICs.

The LMP860x family was designed specifically for high-accuracy, high-common-mode current sensing in industrial, computing, and automotive power systems-emphasizing robustness, low drift, and flexible signal conditioning.

FAQ

What is the maximum common-mode voltage supported by the LMP8603QMM/NOPB?

The LMP8603QMM/NOPB supports a –22V to +60V input common-mode voltage range when operated from a 5V supply, and –4V to +27V at 3.3V supply. This enables direct high-side or negative-rail current sensing in demanding power architectures without external level-shifting circuitry.

How does the OFFSET pin function in the LMP8603QMM/NOPB?

The OFFSET pin on the LMP8603QMM/NOPB sets the output DC bias point to enable bidirectional current measurement. When driven to VS/2 (e.g., 2.5V at 5V supply), the output centers at mid-scale, allowing positive and negative shunt voltages to produce corresponding above- and below-mid-scale outputs-essential for motor control and 4–20mA loop diagnostics.

Can the LMP8603QMM/NOPB be used with a 3.3V supply?

Yes, the LMP8603QMM/NOPB operates from a 3.3V supply with a –4V to +27V common-mode input range, 100× gain, and full functionality including OFFSET pin control and A1/A2 filter access. Supply current remains within 0.45–1.3mA across –40°C to +125°C, making it suitable for low-power industrial sensors.

What is the purpose of the A1 and A2 pins on the LMP8603QMM/NOPB?

The A1 pin outputs the 10× preamplified signal; the A2 pin feeds that signal into the 10× output buffer. This two-stage architecture allows external RC filters or gain-setting resistors to be inserted between A1 and A2-enabling application-specific noise suppression or fine gain tuning without affecting the core amplifier's DC accuracy or stability.

Does the LMP8603QMM/NOPB require external compensation components?

No, the LMP8603QMM/NOPB is internally compensated and stable driving capacitive loads up to 100pF. Its 60kHz bandwidth and 0.83V/μs slew rate are specified with no external components. However, if additional filtering is added between A1 and A2, stability analysis is recommended per TI's application notes for the LMP860x family.