Texas Instruments LMP8601QMAX/NOPB

Overview

LMP8601QMAX/NOPB from Texas Instruments is a precision bidirectional current-sense amplifier with fixed 20× gain, –22V to +60V input common-mode voltage range (at 5V supply), 90dB minimum CMRR, and ±1mV max input offset voltage. It enables high-accuracy shunt-based current monitoring in industrial power supplies, server VRMs, and motor control stages where wide common-mode rejection and in-line filtering capability are required.

For engineers reviewing the LMP8601QMAX/NOPB datasheet, LMP8601QMAX/NOPB pinout, LMP8601QMAX/NOPB application, or LMP8601QMAX/NOPB equivalent, key selection criteria include its rail-to-rail output swing at 5V supply, ±10μV/°C TCVOS, dual-stage gain architecture (10× preamp + 2× buffer), A1/A2 filter interface, and SOIC-8 package compatibility with high-voltage PCB layouts.

Technical Context

The LMP8601QMAX/NOPB implements a proprietary chopping level-shift input stage that translates high common-mode signals into the supply rails before amplification, enabling operation beyond VS and GND. Its two-stage architecture separates preamplifier output (A1) and buffer input (A2), allowing external RC networks for noise suppression without affecting gain accuracy.

It supports single-supply bidirectional sensing via the OFFSET pin, which sets the output mid-scale reference point. The device achieves 60kHz bandwidth and 0.83V/µs slew rate at 5V supply while maintaining <±2.8ppm/°C gain drift and <±10μV/°C offset drift across –40°C to +125°C.

Key Specifications

Pinout & Package

The LMP8601QMAX/NOPB is housed in an 8-pin SOIC (D package), 4.90mm × 6.00mm body size, with standard lead pitch and creepage clearance suitable for 60V working voltage applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ASA+T, the LMP8601QMAX/NOPB uniquely combines accessible preamp output (A1), dedicated filter input (A2), and robust ±82V differential tolerance-enabling EMI-hardened designs without sacrificing DC accuracy or requiring layout rework.

Availability

LMP8601QMAX/NOPB is available at Aetrix Electronics and suitable for server VRMs, industrial DC/DC converters, and linear motor power stages requiring stable component supply, automotive-grade qualification (Q1), and long-term production continuity.

Supply support for LMP8601QMAX/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 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 fault resilience, thermal stability, and integration of filtering interfaces.

FAQ

What is the maximum common-mode voltage supported by the LMP8601QMAX/NOPB?

The LMP8601QMAX/NOPB supports a maximum input common-mode voltage range of –22V to +60V when operated from a 5V supply, as specified in the Absolute Maximum Ratings and Recommended Operating Conditions tables. This enables direct high-side sensing in 48V systems and battery stack monitoring without external level-shifting circuitry. Operation outside this range risks permanent damage or degraded performance.

How does the OFFSET pin function in bidirectional current sensing with the LMP8601QMAX/NOPB?

The OFFSET pin on the LMP8601QMAX/NOPB sets the output's zero-current reference point: applying 0V yields negative full-scale output for reverse current flow, while applying VS (5V) yields positive full-scale for forward current. This allows true bidirectional measurement using a single 5V supply and standard ADC, eliminating need for dual supplies or external level shifters. The LMP8601QMAX/NOPB's internal architecture ensures monotonic response across the entire OFFSET voltage range.

Can the LMP8601QMAX/NOPB be used with a 3.3V supply, and what changes occur?

Yes, the LMP8601QMAX/NOPB operates from 3V to 5.5V supply. At 3.3V, the common-mode input range narrows to –4V to +27V, bandwidth remains 60kHz, and output swing reduces to 3.25V (to VS) and 2mV (to GND). Input offset voltage and TCVOS remain unchanged, but PSRR degrades slightly (±320μV/V vs ±50μV/V at 3.3V). All other specifications-including gain accuracy, CMRR, and A1/A2 interface functionality-are preserved.

What is the purpose of the A1 and A2 pins on the LMP8601QMAX/NOPB, and how are they used?

The A1 pin outputs the 10× preamplified signal with a 100kΩ series impedance; the A2 pin feeds that signal into the 2× output buffer. This split-gain architecture allows insertion of passive RC filters between A1 and A2 to suppress high-frequency noise (e.g., switching EMI) without affecting DC gain accuracy or stability. The LMP8601QMAX/NOPB datasheet confirms this configuration supports standard low-pass filter design with predictable pole placement and no additional compensation.

Is the LMP8601QMAX/NOPB qualified for automotive applications, and what evidence supports this?

Yes, the LMP8601QMAX/NOPB carries Automotive Q1 qualification per AEC-Q100 Rev-G, confirmed by its "Q" suffix and packaging designation (SOIC-8 with enhanced moisture sensitivity level and extended temperature range –40°C to +125°C). Its electrical specifications-including ±10μV/°C TCVOS, 90dB CMRR, and –22V to +60V common-mode range-are tested and guaranteed across the full automotive temperature range, making it suitable for engine control units, battery management, and ADAS power stages.