Analog Devices Inc. LT1076CR-5#TRPBF

Overview

LT1076CR-5#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 5V fixed-output buck switching regulator with integrated 2A bipolar power switch, 100kHz oscillator, and on-chip current limiting. It operates from 8V–60V input in buck mode and supports tapped-inductor configurations delivering up to 4A at 5V. Used in industrial power supplies requiring stable low-noise 5V rails.

For engineers reviewing the LT1076CR-5#TRPBF datasheet, LT1076CR-5#TRPBF pinout, LT1076CR-5#TRPBF application, or LT1076CR-5#TRPBF equivalent, key selection criteria include its 2% output voltage tolerance over temperature, true analog multiplier feedback for fast line transient response, and −40°C to 85°C operating range in TO-220-5 package.

Technical Context

The LT1076CR-5#TRPBF implements a classic positive buck topology with design innovations enabling reconfiguration as a positive-to-negative converter, negative boost, or flyback converter. Its switch output swings 40V below ground, supporting tapped-inductor operation.

It uses a true analog multiplier in the feedback loop-making loop gain independent of input voltage and enabling near-instantaneous response to VIN fluctuations. Pulse-by-pulse current limiting ensures robustness against output shorts and overloads.

Key Specifications

Pinout & Package

LT1076CR-5#TRPBF is housed in a 5-lead plastic TO-220 package (T package), with tab connected to GND for thermal dissipation and mechanical mounting. The lead form is standard straight leads (Flow 06).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output buck regulator applications.

Compared with LT1076CR-5#TRPBF, LT1074CT#TRPBF delivers higher output current in a surface-mount package but forfeits sub-8V startup capability, while LT3430EDD#TRPBF offers higher frequency and smaller footprint at the cost of added external components and no factory-trimmed 5V output.

Availability

LT1076CR-5#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, POS terminal designs, test equipment auxiliary rails, and legacy controller retrofits requiring stable component supply and long-term lifecycle support.

Supply support for LT1076CR-5#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 high-reliability analog and power management portfolio for industrial, automotive, and communications markets.

The LT1076 family was designed as monolithic bipolar switching regulators targeting cost-sensitive, high-reliability industrial power conversion-emphasizing integration, ruggedness, and multi-topology flexibility without external current-sense resistors.

FAQ

What is the maximum input voltage for LT1076CR-5#TRPBF in buck configuration?

The LT1076CR-5#TRPBF supports an input voltage range of 8V to 60V in standard buck operation. Absolute maximum input voltage is 45V per absolute ratings, but sustained operation above 40V requires careful thermal design due to increased power dissipation in the internal switch. For reliable long-term use, 60V is specified only under transient conditions per datasheet Note 7.

Does LT1076CR-5#TRPBF require external feedback resistors to set the 5V output?

No, the LT1076CR-5#TRPBF has a factory-trimmed internal 5.0V reference and fixed feedback network-no external resistors are needed to achieve its nominal 5V output. The SENSE pin connects directly to the output (or through optional RC filter), eliminating resistor tolerance errors and simplifying layout for fixed-output applications.

Can LT1076CR-5#TRPBF be used in a positive-to-negative converter configuration?

Yes, the LT1076CR-5#TRPBF is explicitly designed for multi-topology operation including positive-to-negative conversion. Its switch output is rated to swing 40V below ground, enabling direct drive of inverting configurations. Application Note 44 provides verified schematics and component selection guidelines for this mode.

What is the thermal resistance (θJA) of the LT1076CR-5#TRPBF package?

The LT1076CR-5#TRPBF uses a 5-lead plastic TO-220 (T package) with θJA = 50°C/W under standard JEDEC 2S2P test conditions. This value assumes a 1-inch² copper pad on the PCB connected to the GND tab. Actual thermal performance improves significantly with larger copper areas or external heatsinking-critical for >1.5A continuous loads at elevated ambient temperatures.

Is LT1076CR-5#TRPBF RoHS compliant and lead-free?

Yes, the "#PBF" suffix in LT1076CR-5#TRPBF indicates it is lead-free and RoHS compliant. The part uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3). Tape-and-reel packaging (#TRPBF) ensures compatibility with automated SMT assembly processes.