Texas Instruments LMP8601QMA/NOPB

Overview

LMP8601QMA/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 maximum input offset voltage. It enables high-accuracy shunt-based current monitoring in industrial power supplies, server VRMs, and motor control systems where wide common-mode rejection and in-line filtering are required.

For engineers reviewing the LMP8601QMA/NOPB datasheet, LMP8601QMA/NOPB pinout, LMP8601QMA/NOPB application, or LMP8601QMA/NOPB equivalent, this page delivers verified electrical specifications, SOIC-8 package layout, real-world use cases in DC/DC converters and field transmitters, and validated alternative parts for design flexibility and supply continuity.

Technical Context

The LMP8601QMA/NOPB implements a two-stage architecture: a chopper-stabilized preamplifier (gain = 10×, 100kΩ output impedance) followed by a buffered output stage (gain = 2×), with A1 and A2 pins enabling external filter insertion or gain adjustment. Its level-shift input stage withstands large differential fault voltages while maintaining low TCVOS (±10μV/°C) and high PSRR (≥90dB).

Operating from a single 5V supply, it supports bidirectional sensing via the OFFSET pin referenced to VS or GND, delivers 60kHz bandwidth, 0.83V/μs slew rate, and drives up to 100pF load without oscillation-making it suitable for direct interface with 12-bit to 16-bit ADCs in high-noise industrial environments.

Key Specifications

Pinout & Package

Package: SOIC-8 (D package), 4.90mm × 6.00mm body, surface-mount, RoHS-compliant, lead-free (NOPB suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX4080TASA+, the LMP8601QMA/NOPB offers superior thermal drift performance (±10μV/°C vs. ±25μV/°C) and dedicated A1/A2 filter access-making it optimal for precision lab instrumentation and industrial DC/DC converters where long-term DC stability outweighs ultra-high bandwidth needs.

Availability

LMP8601QMA/NOPB is available at Aetrix Electronics and suitable for DC/DC converter monitoring, Intel server VRM sensing, linear motor power stages, and field transmitter & sensor applications requiring stable component supply, long-lifecycle support, and automotive-grade traceability.

Supply support for LMP8601QMA/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 product line was designed specifically for high-accuracy, wide common-mode current sensing in industrial power systems, server infrastructure, and motor control-emphasizing low drift, robust fault tolerance, and flexible signal conditioning via exposed gain nodes.

FAQ

What is the maximum common-mode voltage supported by the LMP8601QMA/NOPB?

The LMP8601QMA/NOPB supports a maximum input common-mode voltage range of –22V to +60V when operating from a 5V supply, and –4V to +27V at 3.3V supply. This wide range enables direct high-side sensing in 48V battery systems and industrial 24V/48V rails without external level-shifting circuitry. The device maintains specified performance-including CMRR ≥90dB and gain error ≤±0.5%-across this full range.

How does the A1 and A2 pin functionality enable in-line filtering in the LMP8601QMA/NOPB?

The LMP8601QMA/NOPB exposes its internal preamplifier output at the A1 pin (10× gain, 100kΩ series impedance) and feeds that signal into the output buffer via the A2 pin. By inserting an RC network between A1 and A2, designers implement a first-order low-pass filter that attenuates high-frequency PWM noise while preserving DC and low-frequency current information. This architecture avoids loading the sensitive preamp output and maintains system accuracy-unlike post-output filtering which degrades step response.

Can the LMP8601QMA/NOPB perform true bidirectional current sensing, and how is it configured?

Yes, the LMP8601QMA/NOPB supports true bidirectional current sensing via its dedicated OFFSET pin. When OFFSET is tied to GND, the output centers at ~0.2V for zero current; when tied to VS (5V), it centers at ~4.8V. For symmetric ±2.5V output swing around 2.5V, OFFSET is connected to a precision 2.5V reference. This configuration enables accurate measurement of both sourcing and sinking current in H-bridge motor drivers and regenerative power supplies without polarity reversal circuitry.

What is the significance of the ±10μV/°C TCVOS specification for the LMP8601QMA/NOPB in practical designs?

The ±10μV/°C TCVOS specification means the input-referred offset voltage changes by no more than ±10 microvolts per degree Celsius temperature change. Over a –40°C to +125°C operating range, this results in ≤±1.65mV total drift. With a 50mΩ shunt and 20× gain, that translates to <±1.65A error-critical for applications like server VRMs and lab power supplies where current accuracy must remain within ±0.5% across full temperature range without active calibration.

Does the LMP8601QMA/NOPB require external compensation components for stability?

No, the LMP8601QMA/NOPB is internally compensated and drives capacitive loads up to 100pF without oscillation or peaking, as verified in TI's SLVSJ15 datasheet Figure 5-34 and 5-35. This eliminates need for external compensation networks in standard PCB layouts. However, when using the A1/A2 filter path, designers must ensure added capacitance at A2 does not exceed the buffer's 100pF limit-typically achieved with RC values yielding <100kHz cutoff to maintain phase margin.