Analog Devices Inc. LT3092EDD#TRPBF

Overview

LT3092EDD#TRPBF from Analog Devices is a 2-terminal programmable current source IC requiring only two external resistors to set output current from 0.5mA to 200mA. It operates across 1.2V–40V input range, delivers <0.001%/V line regulation, and features reverse-voltage/reverse-current protection - ideal for intrinsic safety circuits, remote sensor biasing, and precision current limiting in industrial loop-powered systems.

For engineers reviewing the LT3092EDD#TRPBF datasheet, LT3092EDD#TRPBF pinout, LT3092EDD#TRPBF application, or LT3092EDD#TRPBF equivalent, key selection considerations include its resistor-ratio-based programming architecture, 10µA ±1% SET pin reference accuracy, dropout voltage behavior (1.22V @10mA), thermal shutdown with hysteresis, and DFN-8 (3mm × 3mm) package compatibility with high-density PCB layouts.

Technical Context

The LT3092EDD#TRPBF implements a precision 10µA zero-TC reference current source feeding the noninverting input of a power operational amplifier, enabling Kelvin-sensed current regulation. Its architecture eliminates need for input/output capacitors while maintaining >100dB AC impedance above 10kHz.

It supports both floating and ground-referred configurations, with internal protection including reverse-battery tolerance (±40V on IN relative to OUT), current limiting (200mA min), and thermal shutdown at 125°C junction temperature. The exposed pad (Pin 9) is electrically tied to OUT and must be soldered to PCB copper for thermal management.

Key Specifications

Pinout & Package

LT3092EDD#TRPBF uses an 8-lead 3mm × 3mm plastic DFN package (DD) with exposed pad (Pin 9) electrically connected to OUT. The package provides θJA = 28°C/W and requires soldering the exposed pad to PCB copper for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-terminal current source applications.

Compared with LM334Z/NOPB and MAX40007AUT+T, the LT3092EDD#TRPBF uniquely combines 200mA capability, ±40V reverse tolerance, capacitor-free stability, and AEC-Q100 qualification - making it the only option qualified for certified intrinsic safety and automotive-grade 4–20mA transmitter designs.

Availability

LT3092EDD#TRPBF is available at Aetrix Electronics and suitable for industrial 4–20mA transmitters, intrinsic safety barriers, and precision current limiting applications requiring stable component supply across extended temperature ranges (–40°C to 125°C).

Supply support for LT3092EDD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LT3092EDD#TRPBF belongs to Analog Devices' Linear Technology precision current source product line, designed specifically for robust, maintenance-free current regulation in safety-critical and loop-powered systems.

FAQ

What is the minimum load current required for LT3092EDD#TRPBF to regulate properly?

The LT3092EDD#TRPBF requires a minimum load current of 0.5mA to maintain regulation - below this threshold, the device enters dropout and cannot sustain programmed output current. This value is specified in the Electrical Characteristics table as "Minimum Load Current" and is independent of input voltage within the 1.2V–40V operating range. Designers must ensure ROUT is sized so that even at lowest expected VSET, the resulting IOUT remains ≥0.5mA.

Can LT3092EDD#TRPBF operate without input or output capacitors?

Yes, LT3092EDD#TRPBF is explicitly designed for capacitor-free operation - its internal architecture provides inherent stability without requiring input or output bypass capacitors. This feature is critical for intrinsic safety compliance, where stored energy in capacitors could cause sparking. However, if CSET is added across RSET for noise reduction, external frequency compensation (e.g., series RC network) becomes necessary to maintain loop stability.

How does the SET pin leakage affect LT3092EDD#TRPBF accuracy?

Leakage into or out of the SET pin directly introduces error in the 10µA reference current - 10nA of leakage causes ~0.1% output current error. To mitigate this, the LT3092EDD#TRPBF datasheet mandates guarding the SET node with a guard ring tied to OUT, using high-quality insulation (e.g., Teflon), and cleaning flux residues. Layout best practices include double-sided guarding and avoiding conformal coating near the SET trace to prevent moisture-induced drift.

What is the role of the exposed pad (Pin 9) on the LT3092EDD#TRPBF DFN package?

The exposed pad (Pin 9) on the LT3092EDD#TRPBF is electrically connected to the OUT terminal and serves as the primary thermal conduction path. It must be soldered to a dedicated PCB copper pour tied to the OUT net - not left floating or grounded. Proper connection reduces θJA from 28°C/W to ≤15°C/W in typical layouts, preventing thermal shutdown during 200mA operation and improving long-term reliability under continuous load.

Does LT3092EDD#TRPBF support paralleling for higher output current?

Yes, LT3092EDD#TRPBF supports paralleling - two or more devices can be connected with shared IN and SET nodes and individual ballast resistors (e.g., 40mΩ PC traces) on each OUT path to achieve current sharing within ±20%. The worst-case SET–OUT offset of ±2mV enables effective balancing without precision resistors. Paralleling increases total output capacity to 400mA+ while distributing thermal load across multiple packages.