Analog Devices Inc. LT1999MPS8-20#PBF

Overview

LT1999MPS8-20#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 20V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and ±0.5% gain accuracy. It operates from a 4.5V–5.5V supply, draws 1.55mA, and supports high-side or low-side sensing in H-bridge motor control and battery charge monitoring.

For engineers reviewing the LT1999MPS8-20#PBF datasheet, LT1999MPS8-20#PBF pinout, LT1999MPS8-20#PBF application, or LT1999MPS8-20#PBF equivalent, this page delivers verified specifications, FMEA-optimized SO-8 package details, automotive-grade temperature support (–55°C to 150°C), and real-world design context for precision current measurement in harsh voltage environments.

Technical Context

The LT1999MPS8-20#PBF uses matched on-chip resistive sensing (4kΩ differential input) and transconductance-based signal conversion to achieve smooth, continuous operation across its full –5V to 80V common mode range-without gain or offset discontinuity at V_CM = V₊. Its internal 160kΩ/160kΩ REF divider sets mid-supply output reference by default.

It integrates a shutdown pin (SHDN) with <10µA quiescent current, supports external REF biasing for custom output common-mode levels, and features 4kV HBM ESD tolerance. The device maintains >80dB AC CMRR at 100kHz and exhibits 0.8µs common-mode step recovery for fast PWM current sampling.

Key Specifications

Pinout & Package

LT1999MPS8-20#PBF is housed in an 8-lead plastic SO (narrow) package (S8), RoHS-compliant, with lead-free finish and moisture sensitivity level 1. Pinout matches standard SO-8 footprint and is compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ASA+T, the LT1999MPS8-20#PBF uniquely combines MP-grade temperature range (–55°C to 150°C), FMEA-optimized SO-8 pinout, and seamless –5V to 80V common-mode operation-making it the only choice for automotive under-hood and high-reliability industrial current sensing where environmental robustness is non-negotiable.

Availability

LT1999MPS8-20#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery management systems, and industrial power supply designs requiring stable component supply, long lifecycle assurance, and automotive-grade qualification.

Supply support for LT1999MPS8-20#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 precision, high-voltage current sensing for safety-critical and high-reliability applications-including automotive electrification, industrial motor drives, and energy infrastructure-where wide common-mode range and guaranteed performance over extreme temperatures are mandatory.

FAQ

What is the maximum common mode voltage the LT1999MPS8-20#PBF can handle?

The LT1999MPS8-20#PBF supports an input common mode voltage range of –5V to 80V, verified per datasheet Rev. E. This allows direct high-side sensing in 48V and 60V systems, including transient overvoltage conditions up to 88V on +IN/–IN pins without clamp activation. Operation remains linear and accurate across the full range, with no discontinuity at V_CM = V₊.

Does the LT1999MPS8-20#PBF require external components for basic operation?

Yes-the LT1999MPS8-20#PBF requires two 0.1µF bypass capacitors (V+ to GND) and optionally a 160kΩ/160kΩ divider on the REF pin if external biasing is not used. The internal REF divider provides mid-supply default, but external drive is supported. No gain-setting resistors are needed since gain is fixed at 20V/V. SHDN may be left floating for always-on operation.

Is the LT1999MPS8-20#PBF pin-compatible with other LT1999 variants?

Yes-LT1999MPS8-20#PBF shares identical SO-8 (S8) pinout and footprint with all LT1999-x variants in the MPS8 package family (e.g., LT1999MPS8-10#PBF, LT1999MPS8-50#PBF). Gain differences are internal and do not affect pin function, allowing drop-in replacement when gain requirements change-provided system-level gain calibration is updated accordingly.

What is the shutdown current consumption of the LT1999MPS8-20#PBF?

In shutdown mode (SHDN ≤ 0.5V), the LT1999MPS8-20#PBF draws less than 10µA typical supply current, as specified in the Electrical Characteristics table (Rev. E, page 7). This ultra-low quiescent state enables energy-efficient operation in battery-powered or intermittently active systems without compromising wake-up speed-turn-on time is just 1µs.

How does the LT1999MPS8-20#PBF handle common-mode transients in PWM applications?

The LT1999MPS8-20#PBF achieves 0.8µs common-mode step recovery time for ±50V transitions (20ns edge), enabling accurate current sampling within one microsecond after a PWM edge. Its >80dB AC CMRR at 100kHz and internal architecture ensure minimal gain/offset perturbation-critical for maintaining control loop stability in high-frequency motor drives and SMPS where V_CM swings rapidly.