Analog Devices Inc. LT6100CDD#TRPBF

Overview

LT6100CDD#TRPBF from Analog Devices (formerly Linear Technology) is a precision, gain-selectable high-side current sense amplifier designed for unidirectional monitoring of load currents via an external sense resistor. It delivers 0.5% gain accuracy across six pin-selectable gains (10–50V/V), operates with sense inputs up to 48V, and features 300µV max input offset voltage, 105dB CMRR, and 60µA supply current - enabling accurate battery, fuse, and portable power system monitoring.

For engineers reviewing the LT6100CDD#TRPBF datasheet, LT6100CDD#TRPBF pinout, LT6100CDD#TRPBF application, or LT6100CDD#TRPBF equivalent, key selection criteria include its 4.1V–48V common-mode input range, reverse-battery protection to –48V, power-down input leakage <1nA, DFN-8 package thermal performance (θJA = 43°C/W), and compatibility with low-value sense resistors down to 3mΩ in 0°C–70°C industrial applications.

Technical Context

The LT6100CDD#TRPBF uses an Over-The-Top® front-end architecture to maintain functionality at VS+ inputs as low as 4.1V (1.4V above VCC) and as high as 48V, while rejecting common-mode variations via >105dB CMRR. Its dual-stage gain structure fixes the first stage at 10V/V and configures the second stage (A2 op amp) via A2/A4 pins to achieve total gains of 10, 12.5, 20, 25, 40, or 50V/V.

Signal integrity is preserved by a dedicated FIL pin enabling single-capacitor low-pass filtering (e.g., 220pF → 12kHz rolloff), and output buffering ensures stable driving of capacitive loads up to 1000pF. Power-down behavior isolates sense inputs (IS+, IS– < 1nA at VCC = 0V), preventing circuit loading during standby.

Key Specifications

Pinout & Package

The LT6100CDD#TRPBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed thermal pad (Pin 9 = VEE), requiring soldering to PCB for thermal performance (θJA = 43°C/W). Pin 1 is marked by top-side notch or dot.

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 INA240A1DGNR, the LT6100CDD#TRPBF uniquely combines pin-selectable gain, sub-1nA power-down leakage, and Over-The-Top® input operation - making it optimal for compact, battery-sensitive, and flexible-gain industrial monitoring where input isolation and wide common-mode range are mandatory.

Availability

LT6100CDD#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, fuse monitoring, and portable test equipment requiring stable component supply, RoHS-compliant packaging, and guaranteed 0°C–70°C performance.

Supply support for LT6100CDD#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 legacy of high-performance analog ICs for precision signal conditioning and power management.

The LT6100 product line delivers micropower, high-voltage-capable current sensing for industrial, automotive, and portable systems - emphasizing accuracy, robustness, and ease of integration without external gain components.

FAQ

What is the maximum sense voltage range supported by the LT6100CDD#TRPBF?

The LT6100CDD#TRPBF supports a differential sense voltage (VSENSE = VS+ – VS–) up to ±300mV at VCC = 5V, with full-scale operation verified from 110mV to 300mV depending on gain and supply conditions. This range enables accurate current measurement across shunt resistors from 3mΩ to 100mΩ while maintaining linearity and avoiding saturation.

How does the LT6100CDD#TRPBF handle reverse battery conditions?

The LT6100CDD#TRPBF withstands reverse battery conditions down to –48V on both VS+ and VS– inputs without damage or latch-up. This is achieved through internal protection circuitry that blocks reverse conduction paths, eliminating the need for external series diodes in automotive or backup power applications where polarity reversal is possible.

Can the LT6100CDD#TRPBF operate with a 3V supply and still monitor 48V bus voltages?

Yes - the LT6100CDD#TRPBF's Over-The-Top® input architecture allows it to monitor sense inputs up to 48V even when VCC is as low as 2.7V. At VCC = 3V, the minimum functional VS+ voltage is 4.1V (1.4V above VCC), ensuring reliable operation across the full 4.1V–48V common-mode range without auxiliary supplies.

What is the purpose of the FIL pin on the LT6100CDD#TRPBF?

The FIL pin on the LT6100CDD#TRPBF connects internally to a 60kΩ resistor network and enables simple single-capacitor low-pass filtering of the sensed signal. Adding a capacitor (e.g., 220pF) between FIL and VEE creates a 12kHz cutoff frequency, suppressing high-frequency noise from switching regulators or motor commutation without affecting DC accuracy.

Does the LT6100CDD#TRPBF require external components for basic operation?

No - the LT6100CDD#TRPBF requires only an external sense resistor and optional FIL capacitor for basic operation. Gain is set entirely by strapping A2/A4 pins to VEE or leaving them floating; no external gain resistors, compensation networks, or power supply sequencing circuitry are needed, reducing BOM count and layout complexity.