Analog Devices Inc. LT6100HMS8#TRPBF

Overview

LT6100HMS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision, micropower, high-side current sense amplifier with pin-selectable gain (10–50 V/V), 4.1V–48V input common-mode range, and ±300µV max input offset voltage over –40°C to 125°C. It monitors unidirectional load currents via an external sense resistor in battery protection, fuse monitoring, and industrial power systems.

For engineers reviewing the LT6100HMS8#TRPBF datasheet, LT6100HMS8#TRPBF pinout, LT6100HMS8#TRPBF application, or LT6100HMS8#TRPBF equivalent, key selection criteria include guaranteed 125°C operation, reverse-battery tolerance to –48V, 60µA supply current, 0.5% gain accuracy, and MSOP-8 package compatibility with Kelvin-sense layouts.

Technical Context

The LT6100HMS8#TRPBF uses Over-The-Top® input topology to maintain functionality at VS+ up to 48V while operating from a separate 2.7V–36V VCC supply. Its two-stage architecture first level-shifts and amplifies VSENSE by 10× via internal resistors RG1/RG2, then applies programmable gain (1.0–5.0×) through op amp A2 controlled by pins A2 and A4.

Gain selection is implemented via strapping A2 (Pin 6) and A4 (Pin 7) to VEE or leaving them open, enabling six discrete gains without external components. The FIL pin provides a single-capacitor low-pass filter path (f_–3dB = 1/(2π × 60kΩ × C)) for noise rejection in high-ripple environments.

Key Specifications

Pinout & Package

LT6100HMS8#TRPBF is housed in an 8-lead plastic MSOP (MS8) package with exposed pad soldered to PCB ground for thermal performance (θ_JA = 250°C/W). Pin 1 is marked by a dot or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDGKRQ1 and MAX40056ATA+T, the LT6100HMS8#TRPBF uniquely combines pin-selectable gain, –48V reverse-battery tolerance, and a dedicated FIL filter node - making it optimal for cost-sensitive, thermally demanding industrial and telecom power systems where layout simplicity and transient robustness are critical.

Availability

LT6100HMS8#TRPBF is available at Aetrix Electronics and suitable for battery protection, fuse monitoring, and industrial motor drive applications requiring stable component supply across extended temperature ranges.

Supply support for LT6100HMS8#TRPBF 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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, including high-performance current sense amplifiers optimized for signal integrity and rugged operation.

The LT6100 product line delivers micropower, high-voltage, high-accuracy current sensing for safety-critical power monitoring in automotive, industrial, and telecom infrastructure - emphasizing reliability under reverse polarity, wide temperature, and high dv/dt conditions.

FAQ

What is the maximum common-mode voltage the LT6100HMS8#TRPBF can handle on its sense inputs?

The LT6100HMS8#TRPBF supports a differential sense voltage of ±48V and a total VS+/VS– to VEE voltage of 48V. Its sense inputs operate from 4.1V to 48V common-mode and withstand reverse-battery conditions down to –48V when VCC is unpowered - confirmed in Absolute Maximum Ratings and Applications Information sections of the datasheet.

How does the LT6100HMS8#TRPBF achieve gain selection without external resistors?

The LT6100HMS8#TRPBF implements gain selection using two dedicated pins (A2 and A4) that connect to internal resistor networks. Strapping either or both pins to VEE (or leaving them open) configures six precise gains: 10, 12.5, 20, 25, 40, or 50 V/V - eliminating external gain-setting components and reducing board space and calibration complexity for the LT6100HMS8#TRPBF.

Can the LT6100HMS8#TRPBF be used in a system where the monitored supply may collapse to 0V?

Yes. The LT6100HMS8#TRPBF remains functional even if VS+ or VS– collapses to 0V - such as during fuse blow events - because its Over-The-Top® input stage maintains accuracy across the full 4.1V–48V common-mode range and tolerates differential collapse without phase inversion or latch-up, as verified in Figure 3 and Applications Information.

What is the purpose of the FIL pin on the LT6100HMS8#TRPBF, and how is it used?

The FIL pin on the LT6100HMS8#TRPBF connects internally to resistors RE and RO to form a programmable low-pass filter. Adding an external capacitor between FIL and VEE sets the –3dB frequency (f_–3dB = 1/(2π × 60kΩ × C)); for example, 220pF yields 12kHz rolloff - effectively suppressing PWM ripple and high-frequency noise before amplification in the LT6100HMS8#TRPBF.

Does the LT6100HMS8#TRPBF draw current from the monitored circuit when VCC is powered down?

No. When VCC = 0V, the LT6100HMS8#TRPBF sense inputs enter high-impedance state with total input current ≤1nA (typical), as specified in Electrical Characteristics and confirmed in Figure 8 ("Input Remains Hi-Z when LT6100 is Powered Down"). This prevents loading of battery or fuse circuits during standby - a key advantage of the LT6100HMS8#TRPBF's Over-The-Top® architecture.