Texas Instruments LMP8603QMA/NOPB

Overview

LMP8603QMA/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 LMP8603QMA/NOPB datasheet, LMP8603QMA/NOPB pinout, LMP8603QMA/NOPB application, or LMP8603QMA/NOPB equivalent, key selection criteria include its wide common-mode range for battery monitoring, low TCVOS (±10μV/°C) for thermal stability in motor drives, and dual-stage gain architecture enabling external filtering without sacrificing accuracy.

Technical Context

The LMP8603QMA/NOPB implements a proprietary chopping level-shift input stage that translates high common-mode signals into the supply rail domain before amplification, enabling robust operation under fault conditions where differential inputs exceed ±82V. Its two-stage architecture separates preamplification (10× gain, A1 output) from final buffering (10× gain, OUT), with a trimmed 100kΩ internal resistor defining A1's output impedance.

This architecture supports in-line RC filtering between A1 and A2 while preserving DC accuracy, and enables bidirectional sensing via the OFFSET pin referenced to VS or GND - critical for applications requiring zero-current output alignment across temperature and supply variation.

Key Specifications

Pinout & Package

The LMP8603QMA/NOPB is housed in an 8-pin VSSOP (DGK) package measuring 3.00mm × 4.90mm, optimized for space-constrained PCB layouts in server and industrial power modules.

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 LMP8603QMA/NOPB uniquely combines 100× gain, bidirectional OFFSET control, and accessible A1/A2 nodes for in-line filtering-making it optimal for thermally stable, noise-resilient current sensing where layout constraints prevent external filtering before the amplifier.

Availability

LMP8603QMA/NOPB is available at Aetrix Electronics and suitable for server power supplies, linear motor control systems, off-highway vehicle battery management, and field transmitter diagnostics requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for LMP8603QMA/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, automotive, and computing power systems-emphasizing robustness, thermal stability, and architectural flexibility for system-level noise mitigation.

FAQ

What is the maximum common-mode voltage the LMP8603QMA/NOPB supports at 5V supply?

The LMP8603QMA/NOPB supports a common-mode input voltage range of –22V to +60V when operated from a 5V supply, as specified in the absolute maximum and recommended operating conditions tables. This enables direct high-side or negative-rail current sensing in 48V systems without external level-shifting components. The device maintains functional performance across this full range under all specified temperature conditions.

How does the A1 and A2 pin interface enable in-line filtering in the LMP8603QMA/NOPB?

The LMP8603QMA/NOPB exposes its internal preamplifier output at the A1 pin (10× gain) and the buffer input at the A2 pin, separated by a trimmed 100kΩ resistor. This allows insertion of passive RC networks between A1 and A2 to attenuate high-frequency noise-such as PWM switching artifacts-without affecting DC gain accuracy or introducing additional offset. The LMP8603QMA/NOPB datasheet provides validated filter design guidelines for this configuration.

Can the LMP8603QMA/NOPB be used for bidirectional current sensing, and how is zero-current output set?

Yes, the LMP8603QMA/NOPB supports bidirectional current sensing via its dedicated OFFSET pin. When OFFSET is connected to VS/2 (e.g., 2.5V for 5V supply), the output centers at mid-supply (2.5V) for zero shunt voltage, enabling positive and negative current detection. This configuration is validated across –40°C to +125°C and maintains ≤±0.5mV output offset error, making the LMP8603QMA/NOPB suitable for motor H-bridge and regenerative braking applications.

What is the typical supply current and thermal performance of the LMP8603QMA/NOPB in VSSOP package?

The LMP8603QMA/NOPB draws 1.1mA typical supply current at 5V, with a maximum of 1.5mA over temperature. In its DGK (VSSOP-8) package, it exhibits a junction-to-ambient thermal resistance (RθJA) of 171.1°C/W. This allows operation up to +125°C ambient with appropriate PCB copper area, and its low quiescent current supports always-on monitoring in energy-sensitive applications like field transmitters and server standby power rails.

Does the LMP8603QMA/NOPB require external compensation or isolation resistors for stability?

No, the LMP8603QMA/NOPB is internally compensated and stable driving capacitive loads up to 100pF without external isolation resistors. The datasheet confirms no sustained oscillations occur under these conditions, and the output stage is characterized for rail-to-rail swing into 100kΩ loads. This eliminates the need for external compensation networks in standard current-sense configurations, simplifying layout and reducing BOM count for the LMP8603QMA/NOPB.