Analog Devices Inc. LT1999MPMS8-10#PBF

Overview

LT1999MPMS8-10#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 10V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and ±0.5% gain accuracy - designed for precision H-bridge motor control, battery charge/discharge monitoring, and high-side solenoid current sensing in extended-temperature industrial and automotive systems.

For engineers reviewing the LT1999MPMS8-10#PBF datasheet, LT1999MPMS8-10#PBF pinout, LT1999MPMS8-10#PBF application, or LT1999MPMS8-10#PBF equivalent, this page delivers verified electrical parameters, FMEA-optimized MSOP-8 pin mapping, MP-grade (–55°C to 150°C) thermal performance data, and real-world design context for high-reliability current measurement under extreme voltage transients.

Technical Context

The LT1999MPMS8-10#PBF uses a matched-resistor transconductance architecture with internal 4kΩ differential input impedance and 40kΩ gain-setting resistor (RG), enabling accurate VOUT = 10 × (V+IN – V–IN) + VREF output scaling. Its dual-path biasing (D1-assisted below V+, passive above V+) ensures smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.

It features an integrated 2µA SHDN pull-up, 0.8µs common-mode step recovery (±50V), and REF pin with 60kΩ–100kΩ input impedance - allowing flexible mid-supply or external reference level setting while maintaining ≤±3.5mV input-referred offset over –55°C to 150°C.

Key Specifications

Pinout & Package

LT1999MPMS8-10#PBF is housed in an 8-lead plastic MSOP package (3mm × 3mm, 0.65mm pitch) with FMEA-optimized pinout - relocating NC to Pin 3 to prevent misconnection-induced fault propagation in safety-critical systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999MPMS8-10#PBF uniquely combines MP-grade temperature range, FMEA-optimized MSOP-8 pinout, and guaranteed 2MHz bandwidth with 0.8µs common-mode recovery - making it the only option qualified for safety-critical 80V systems requiring continuous operation from –55°C to 150°C.

Availability

LT1999MPMS8-10#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery management systems, solenoid actuator monitoring, and high-voltage power supply current sensing requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LT1999MPMS8-10#PBF 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LT1999 product line delivers high-voltage, high-accuracy current sensing for safety-critical power systems - engineered specifically for automotive AEC-Q100 H-grade and extended-temperature MP-grade applications demanding robustness under voltage transients and thermal stress.

FAQ

What is the maximum common mode voltage the LT1999MPMS8-10#PBF can handle?

The LT1999MPMS8-10#PBF supports a continuous input common mode voltage range of –5V to 80V, verified across its full –55°C to 150°C operating temperature range. This allows direct high-side sensing in 48V, 60V, and 80V industrial and automotive power rails without external level-shifting circuitry. Absolute maximum ratings permit brief (10ms) exposure to ±60V differential and –5.25V to 88V common mode.

Does the LT1999MPMS8-10#PBF require external resistors for gain setting?

No, the LT1999MPMS8-10#PBF has a fixed 10V/V gain implemented with laser-trimmed on-chip resistors - including a nominal 40kΩ RG and matched 4kΩ RIN network. No external gain-setting components are needed, eliminating drift, layout sensitivity, and BOM overhead. The REF pin may be left floating (defaults to 2.5V) or driven externally for custom output common-mode levels.

How does the FMEA-optimized pinout of the LT1999MPMS8-10#PBF improve system reliability?

Unlike the original MSOP pinout, the LT1999MPMS8-10#PBF places NC on Pin 3 - physically separating +IN (Pin 1) and –IN (Pin 2) from adjacent pins. This prevents accidental solder bridging or connector misalignment from shorting the sense inputs, a failure mode that could cause catastrophic overcurrent in motor or power supply applications. It directly supports ISO 26262 ASIL-B hardware fault tolerance requirements.

Can the LT1999MPMS8-10#PBF operate from a 3.3V supply?

No - the LT1999MPMS8-10#PBF requires a 4.5V to 5.5V supply (V+), with typical operation at 5V. Operation below 4.5V is possible but not characterized or guaranteed; performance parameters such as bandwidth, CMRR, and output swing degrade outside the specified range. For 3.3V systems, consider alternatives like MAX40056 or AD8418, which are explicitly rated for lower supply voltages.

What is the purpose of the REF pin on the LT1999MPMS8-10#PBF, and how should it be used?

The REF pin on the LT1999MPMS8-10#PBF sets the output common-mode voltage - VOUT = 10 × (V+IN – V–IN) + VREF. It can be left floating (internal 160k/160k divider sets it to 2.5V), tied to mid-supply, or driven by an external voltage source (1.5V to V+–1.25V). This flexibility enables ratiometric ADC interfacing, level-shifting for single-supply systems, or synchronization with other analog blocks sharing a common reference plane.