Texas Instruments LMP8603MA/NOPB

Overview

LMP8603MA/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), ±1mV max input offset voltage, and 90dB minimum CMRR. It enables high-accuracy shunt-based current monitoring in industrial power supplies and server VRMs where wide common-mode rejection and in-line signal conditioning are required.

For engineers reviewing the LMP8603MA/NOPB datasheet, LMP8603MA/NOPB pinout, LMP8603MA/NOPB application, or LMP8603MA/NOPB equivalent, key selection criteria include its 100× fixed gain architecture, dual-stage internal amplification (10× preamp + 10× buffer), A1/A2 filter-access pins, ±10μV/°C TCVOS, and SOIC-8 package compatibility with high-voltage DC/DC converter feedback loops.

Technical Context

The LMP8603MA/NOPB implements a proprietary chopping level-shift input stage that translates high common-mode signals into the supply rail range before amplification, enabling operation at –22V to +60V V_CM with a single 5V supply. Its two-stage gain architecture separates preamplification (10×, output on A1) from final buffering (10×, output on OUT), with the A1–A2 path explicitly designed for external RC filtering or gain modification.

This architecture delivers 90dB minimum CMRR at DC and 83dB at 10kHz (VS = 5V), ±1mV input offset voltage over –40°C to +125°C, and 60kHz bandwidth while maintaining 0.83V/μs slew rate. The OFFSET pin provides DC bias control for true bidirectional sensing without external level-shifting circuitry.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX40056ASA+T, the LMP8603MA/NOPB uniquely provides dual-access A1/A2 nodes for configurable filtering and maintains ±10μV/°C TCVOS at 100× gain - critical for temperature-stable high-accuracy current measurement in server and industrial power systems.

Availability

LMP8603MA/NOPB is available at Aetrix Electronics and suitable for server VRM current monitoring, industrial DC/DC converter feedback, linear motor power stages, and field transmitter & sensor loop applications requiring stable component supply and long-term manufacturability.

Supply support for LMP8603MA/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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers and power management ICs.

The LMP860x family was designed specifically for high-accuracy, high-common-mode current sensing in unidirectional and bidirectional power conversion systems - targeting server, industrial, and automotive applications demanding low drift and robust fault tolerance.

FAQ

What is the maximum common-mode voltage supported by the LMP8603MA/NOPB?

The LMP8603MA/NOPB supports –22V to +60V input common-mode voltage when operating from a 5V supply, and –4V to +27V when operating from a 3.3V supply. This enables direct connection to high-side shunts in 48V systems and negative-rail motor drivers without external level-shifting circuitry. Absolute maximum ratings allow –25V to +65V on input pins under fault conditions.

How does the A1 and A2 pin configuration enable signal conditioning in the LMP8603MA/NOPB?

The LMP8603MA/NOPB exposes the 10× preamplifier output on A1 and the 10× buffer input on A2, allowing insertion of external RC networks between them. This enables user-defined low-pass filtering to suppress EMI or adjust bandwidth without affecting gain accuracy - a capability absent in most monolithic current-sense amplifiers. The internal 100kΩ A1 resistor ensures stable interface impedance.

Can the LMP8603MA/NOPB be used for bidirectional current sensing with a single supply?

Yes. The LMP8603MA/NOPB supports true bidirectional sensing using its dedicated OFFSET pin, which accepts a DC voltage (0V to VS) to set the output zero point. When OFFSET = VS/2, the output centers at mid-supply, enabling positive and negative current measurements on a single 3.3V or 5V rail - eliminating need for dual supplies or external op-amps in applications like motor control and regenerative braking.

What is the typical gain error and drift specification for the LMP8603MA/NOPB?

The LMP8603MA/NOPB has ±0.5% maximum gain error and ±2.8 ppm/°C maximum gain error drift over –40°C to +125°C. At 100× gain, this translates to <±0.05% full-scale error contribution from gain variation across temperature - critical for high-accuracy power metering and closed-loop current control where calibration stability is essential.

Does the LMP8603MA/NOPB require external components for basic operation?

No. The LMP8603MA/NOPB operates with only bypass capacitors on VS and GND for stable operation. The OFFSET pin may be tied directly to VS/2 (via resistor divider) or to an external reference for bidirectional sensing. External components are optional - used only when leveraging A1/A2 for filtering or modifying effective gain; the core 100× amplification functions autonomously.