Texas Instruments LMP8601MA/NOPB

Overview

LMP8601MA/NOPB from Texas Instruments is a fixed-gain, bidirectional current-sense amplifier with 20× precision gain, –22V to +60V input common-mode voltage range (at 5V supply), ±1mV max input offset voltage, and 90dB minimum CMRR. It enables high-accuracy shunt-based current monitoring in DC/DC converters and industrial motor power stages where wide common-mode rejection and in-line filtering capability are required.

For engineers reviewing the LMP8601MA/NOPB datasheet, LMP8601MA/NOPB pinout, LMP8601MA/NOPB application, or LMP8601MA/NOPB equivalent, key selection criteria include its single-supply bidirectional operation, integrated preamplifier output (A1) for external filter insertion, ±10μV/°C TCVOS, and SOIC-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LMP8601MA/NOPB implements a two-stage architecture: a chopping-based level-shift preamplifier (gain = 10×, trimmed 100kΩ output impedance) followed by a buffered output stage (gain = 2×). The A1 and A2 pins expose the inter-stage node, enabling passive RC filtering or gain adjustment without affecting common-mode rejection.

Its proprietary input stage uses level-shift resistors to withstand large differential fault voltages while maintaining ±1mV offset and ±10μV/°C drift across –40°C to +125°C. CMRR remains ≥90dB over –20V to +60V VCM at 5V supply, supporting accurate sensing in noisy high-side or low-side configurations.

Key Specifications

Pinout & Package

Package: SOIC-8 (D package), 4.90mm × 6.00mm body size, standard JEDEC MS-012 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX4080TASA+, the LMP8601MA/NOPB uniquely provides accessible A1/A2 nodes for in-line filtering and an OFFSET pin for single-supply bidirectional operation-making it optimal for cost-sensitive industrial motor and DC/DC designs requiring configurable signal conditioning.

Availability

LMP8601MA/NOPB is available at Aetrix Electronics and suitable for DC/DC converter monitoring, linear motor power stage feedback, and Intel server VRM current telemetry requiring stable component supply and long-term industrial availability.

Supply support for LMP8601MA/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 broad portfolio coverage across industrial, automotive, and communications markets.

The LMP860x family is designed for high-accuracy unidirectional and bidirectional current sensing in power conversion and motor control systems where wide common-mode range and low drift are essential.

FAQ

What is the maximum common-mode voltage supported by the LMP8601MA/NOPB?

The LMP8601MA/NOPB supports a common-mode input voltage range of –22V to +60V when operated from a 5V supply, and –4V to +27V at 3.3V supply. This enables direct high-side sensing in 48V battery systems and industrial bus architectures without external level-shifting circuitry. The specification is validated per TI SLVSJ15 datasheet Section 5.6.

Does the LMP8601MA/NOPB support bidirectional current sensing with a single 5V supply?

Yes, the LMP8601MA/NOPB supports true bidirectional current sensing using its dedicated OFFSET pin. Applying a DC bias (e.g., 2.5V) to OFFSET sets the zero-current output level at mid-supply, allowing positive and negative current flow to produce corresponding above- and below-mid-scale output voltages-all with a single 5V rail. This functionality is confirmed in Section 6.3.1 of the LMP8601MA/NOPB datasheet.

What is the purpose of the A1 and A2 pins on the LMP8601MA/NOPB?

The A1 pin outputs the 10× preamplified signal with a 100kΩ source impedance, and the A2 pin feeds that signal into the 2× output buffer stage. This exposed inter-stage node allows designers to insert external RC filters between A1 and A2 for noise suppression or adjust gain using discrete resistors-without compromising the device's specified CMRR or offset performance. This architecture is detailed in Figure 6-2 and Section 6.1.1 of the LMP8601MA/NOPB datasheet.

What is the typical supply current consumption of the LMP8601MA/NOPB?

The LMP8601MA/NOPB draws 1.1mA typical supply current at 5V and 25°C, with a guaranteed range of 0.45mA to 1.5mA across –40°C to +125°C. This low quiescent current supports always-on current monitoring in energy-sensitive applications such as server VRMs and portable instrumentation, as specified in Section 5.6 Electrical Characteristics of the LMP8601MA/NOPB datasheet.

How does the LMP8601MA/NOPB achieve high common-mode rejection ratio (CMRR)?

The LMP8601MA/NOPB achieves ≥90dB minimum CMRR through a proprietary chopping-level-shift input architecture that actively manages common-mode voltage before amplification. This technique maintains high rejection across –20V to +60V VCM and over temperature, unlike conventional amplifiers whose CMRR degrades at extreme common-mode extremes. Measured data appears in Figures 5-12 and 5-13 of the LMP8601MA/NOPB datasheet.