Analog Devices Inc. LT6100HMS8#PBF

Overview

LT6100HMS8#PBF from Analog Devices (acquired Linear Technology) is a precision, gain-selectable high-side current sense amplifier for unidirectional monitoring via external shunt resistors. It delivers 0.5% gain accuracy across six pin-configurable gains (10–50V/V), 300µV max input offset, 105dB CMRR/PSRR, and operates from 4.1V to 48V common-mode input with 2.7V–36V supply. Used in battery/fuse monitoring and portable power systems requiring stable current measurement at –40°C to 125°C.

For engineers reviewing the LT6100HMS8#PBF datasheet, LT6100HMS8#PBF pinout, LT6100HMS8#PBF application, or LT6100HMS8#PBF equivalent, key selection criteria include its wide input common-mode range, reverse-battery protection to –48V, 60µA quiescent current, power-down input leakage <1nA, and MSOP-8 package compatibility with high-temperature industrial designs.

Technical Context

The LT6100HMS8#PBF employs an Over-The-Top® input topology enabling operation with VS+ up to 48V while VCC is as low as 2.7V. Its two-stage architecture first level-shifts and amplifies VSENSE by fixed 10V/V (A1 stage), then applies programmable gain (A2 stage) via A2/A4 pins to achieve total gains of 10, 12.5, 20, 25, 40, or 50V/V.

It integrates a dedicated filter pin (FIL) connected to internal 60kΩ resistance, allowing single-capacitor low-pass filtering (e.g., 220pF → 12kHz rolloff). Input biasing remains functional down to 4.1V common mode, and reverse-battery tolerance (–48V on VS+/VS–) is achieved without external components.

Key Specifications

Pinout & Package

LT6100HMS8#PBF is housed in an 8-lead plastic MSOP package (3mm × 3mm footprint, 1.1mm height), rated for –40°C to 125°C operation. Exposed pad not present; standard MSOP thermal performance applies (θJA = 250°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4080TASA+ and INA240A1QDRQ1, LT6100HMS8#PBF uniquely combines wide VCC range (2.7V–36V), pin-selectable gain, and guaranteed 125°C operation - making it optimal for industrial and high-temperature embedded systems requiring analog flexibility and robustness.

Availability

LT6100HMS8#PBF is available at Aetrix Electronics and suitable for battery management, fuse monitoring, portable test equipment, and industrial motor drive applications requiring stable component supply across extended temperature ranges.

Supply support for LT6100HMS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through acquisition of Linear Technology in 2017.

The LT6100 product line was designed by Linear Technology specifically for precision high-side current sensing in space-constrained, high-reliability applications - emphasizing low offset, wide common-mode range, and robust power-down behavior.

FAQ

What is the maximum common-mode voltage supported by LT6100HMS8#PBF?

The LT6100HMS8#PBF supports a differential sense voltage of ±48V and a total VS+, VS– to VEE voltage of 48V. Its common-mode input range extends from 4.1V to 48V, enabling direct monitoring of 12V, 24V, and 48V power rails without attenuation or level-shifting networks. This specification is guaranteed over the full –40°C to 125°C operating temperature range for the LT6100H grade.

How does LT6100HMS8#PBF achieve gain selection without external resistors?

The LT6100HMS8#PBF uses two dedicated gain-select pins (A2 and A4) that are strapped to VEE or left floating to configure six precise gains: 10, 12.5, 20, 25, 40, and 50V/V. Internally, the device implements a two-stage architecture where the first stage provides fixed 10V/V gain, and the second stage (op amp A2) applies programmable multiplication (1× to 5×). This eliminates external gain-setting components and maintains 0.5% accuracy across all settings in LT6100HMS8#PBF.

Can LT6100HMS8#PBF operate with VCC disconnected while monitoring a live battery?

Yes. When VCC is powered down, the LT6100HMS8#PBF's sense inputs (VS+ and VS–) remain high-impedance with leakage current <1nA, thanks to its Over-The-Top® input architecture. This allows permanent connection to battery terminals - including reverse-battery conditions down to –48V - without loading the source or risking damage. The LT6100HMS8#PBF resumes normal operation immediately upon VCC restoration.

What is the purpose of the FIL pin on LT6100HMS8#PBF?

The FIL pin on LT6100HMS8#PBF connects internally to a 60kΩ resistor network and serves as a dedicated node for adding an external capacitor to implement a single-pole low-pass filter. For example, a 220pF capacitor yields a 12kHz –3dB corner frequency, effectively attenuating high-frequency ripple and switching noise from the sense resistor before amplification. This reduces post-processing burden and improves measurement fidelity in noisy power systems.

Does LT6100HMS8#PBF support bidirectional current sensing?

No. The LT6100HMS8#PBF is explicitly designed for unidirectional current sensing only. Its architecture produces a positive output voltage proportional to current flow from VS+ to VS–, with no capability to resolve direction reversal. For bidirectional applications, alternative devices such as the INA240 or MAX4081 series must be selected. The LT6100HMS8#PBF datasheet confirms this limitation in the "Description" and "Applications" sections.