Analog Devices Inc. LT6118IDCB#TRPBF

Overview

LT6118IDCB#TRPBF from Analog Devices (formerly Linear Technology) is a high-side current sense amplifier with integrated 400mV precision reference and latching comparator, designed for overcurrent fault detection in industrial and automotive power systems. It delivers 200µV max input offset, 0.2% max gain error, 1MHz bandwidth, and 1.4µs total propagation delay - enabling fast-acting protection in motor control and battery monitoring.

For engineers reviewing the LT6118IDCB#TRPBF datasheet, LT6118IDCB#TRPBF pinout, LT6118IDCB#TRPBF application, or LT6118IDCB#TRPBF equivalent, key selection criteria include its –40°C to 85°C operating range, 2.7V–60V supply capability, independent comparator input/output, and DFN-8 (2mm × 3mm) package with exposed V– pad for thermal management.

Technical Context

The LT6118IDCB#TRPBF integrates a precision current-sense amplifier that forces SENSEHI to match SENSELO potential via internal feedback, generating an output current I_OUTA = V_SENSE/R_IN. Its comparator uses a trimmed 400mV internal reference with ±1.25% total threshold error and 10mV hysteresis, configurable for power-on reset (POR) and latch enable/disable via the LE pin.

Signal path separation ensures the comparator's INC input and open-drain OUTC output operate independently from the amplifier's OUTA current output. Propagation delay remains ≤1.4µs across temperature, and the device maintains 110dB CMRR at 60V common-mode voltage - critical for accurate sensing in noisy high-voltage rails.

Key Specifications

Pinout & Package

LT6118IDCB#TRPBF is housed in an 8-lead (2mm × 3mm) plastic DFN package with exposed pad (Pin 9) connected internally to V–. The exposed pad may be left unconnected or soldered to a V– copper plane to improve thermal performance in high-power applications. Pin 1 is SENSELO; pin numbering follows standard DFN top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX40056ATA+T and INA301A3IDBVR, LT6118IDCB#TRPBF uniquely combines wide 2.7V–60V operation, user-configurable 400mV-referenced comparator with latch/POR, and 1.4µs fault response - making it the only option suitable for robust overcurrent protection in high-voltage industrial and automotive subsystems.

Availability

LT6118IDCB#TRPBF is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LT6118IDCB#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LT6118 product line was developed by Linear Technology (acquired by ADI in 2017) specifically for high-accuracy, high-speed high-side current sensing with integrated fault detection - targeting applications where reliability, speed, and integration reduce system complexity.

FAQ

What is the maximum common-mode voltage supported by the LT6118IDCB#TRPBF?

The LT6118IDCB#TRPBF supports a maximum common-mode voltage of 60V between V+ and V–. Its SENSEHI and SENSELO pins tolerate up to V+ + 1V, and the absolute maximum V+ – (SENSELO or SENSEHI) is 33V. This allows direct high-side sensing on 48V industrial buses and 12V/24V automotive rails with margin. The device maintains 110dB CMRR at full 60V common-mode, ensuring accuracy in noisy environments.

Does the LT6118IDCB#TRPBF require external resistors to set gain and threshold?

Yes, the LT6118IDCB#TRPBF requires external resistors: R_IN between V+ and SENSEHI sets amplifier gain (I_OUTA = V_SENSE/R_IN), and R_OUT from OUTA to V– converts output current to voltage. The comparator threshold is set by applying a voltage to INC - typically via a resistor divider from OUTA - since the internal 400mV reference connects to the non-inverting input. No resistors are needed for basic reference use, but configuration requires external components.

Can the LT6118IDCB#TRPBF operate with a 3.3V supply rail?

Yes, the LT6118IDCB#TRPBF operates from 2.7V to 60V, so 3.3V is fully supported. At 3.3V, supply current is 450µA typical, input offset remains ±200µV max, and amplifier bandwidth drops to ~140kHz (vs. 1MHz at higher supplies). The comparator retains full functionality, including POR and latch, and OUTC remains compatible with 3.3V logic pull-ups. Ensure V+ ≥ 3.3V and V– = 0V for proper operation.

How does the LE pin affect comparator behavior in the LT6118IDCB#TRPBF?

When LE is high, the LT6118IDCB#TRPBF comparator output (OUTC) latches low upon trip and remains latched until power cycle or LE is pulled low to reset. When LE is low, OUTC operates transparently - returning high immediately when V_INC falls below the hysteresis-adjusted threshold. This dual-mode operation allows flexible fault handling: latched mode for persistent fault indication, transparent mode for continuous monitoring with automatic recovery.

Is the exposed pad on the LT6118IDCB#TRPBF package required to be connected?

No, the exposed pad (Pin 9) on the LT6118IDCB#TRPBF DFN package is internally connected to V– but may be left unconnected. However, soldering it to a V– copper pour significantly improves thermal performance - reducing θ_JA from 64°C/W to lower effective values - which is recommended for applications drawing >1mA supply current or operating near +85°C ambient. It must never serve as the sole V– connection; dedicated Pin 4 must carry all return current.