Analog Devices Inc. LT1076CR-5#PBF

Overview

LT1076CR-5#PBF from Analog Devices (formerly Linear Technology) is a monolithic 5V fixed-output buck switching regulator with an integrated 2A bipolar power switch, 100kHz switching frequency, ±2% output voltage tolerance over temperature, and operation from 8V to 60V input. It supports classic buck, positive-to-negative, and tapped-inductor configurations for up to 4A output in buck mode, used in industrial power supplies and embedded DC/DC conversion.

For engineers reviewing the LT1076CR-5#PBF datasheet, LT1076CR-5#PBF pinout, LT1076CR-5#PBF application, or LT1076CR-5#PBF equivalent, key selection factors include its 2A on-chip switch, true analog multiplier feedback loop for input-voltage-independent loop gain, pulse-by-pulse current limiting, 9.5mA quiescent current, and TO-220-5 package thermal performance (θJA = 50°C/W).

Technical Context

The LT1076CR-5#PBF implements a classic positive buck topology with design innovations enabling reconfiguration as a positive-to-negative or boost converter. Its switch output swings 40V below ground, supporting tapped-inductor operation at up to 4A output current.

It uses a true analog multiplier in the feedback path, delivering near-instantaneous response to input voltage fluctuations and eliminating input-voltage dependence in loop gain. On-chip pulse-by-pulse current limiting ensures robustness against output shorts and overloads without external sensing components.

Key Specifications

Pinout & Package

LT1076CR-5#PBF is housed in a 5-lead plastic TO-220 package (T package), with the metal tab electrically connected to GND and serving as the primary thermal path. The package has θJC = 4°C/W and θJA = 50°C/W, requiring mechanical mounting to a heatsink for continuous 2A operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1076CR-5#PBF, LT1074CN#PBF offers higher current but adds external sensing complexity, while LT3430EFE#PBF provides flexibility and efficiency at the cost of fixed-output convenience and thermal robustness in high-power industrial environments.

Availability

LT1076CR-5#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive subsystems, programmable logic controllers, and telecom line card designs requiring stable component supply, long-lifecycle support, and proven thermal performance in TO-220 packages.

Supply support for LT1076CR-5#PBF 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 portfolio of high-performance analog and power management ICs, emphasizing precision, reliability, and ruggedness for demanding applications.

The LT1076 family was designed as monolithic fixed-output switching regulators targeting industrial and automotive power conversion where simplicity, fault tolerance, and wide input range are critical - eliminating external switch drivers and complex compensation networks.

FAQ

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

The LT1076CR-5#PBF supports up to 60V input voltage in standard buck mode, with absolute maximum rating of 45V applied to the VIN pin. Operation above 45V risks permanent damage; for 60V operation, the LT1076HVCR-5 variant must be used. The device requires ≥8V after startup for regulation, though start-up can occur from as low as 5V in inverting or boost configurations.

Does LT1076CR-5#PBF require an external current-sense resistor?

No, LT1076CR-5#PBF does not require an external current-sense resistor. It features on-chip pulse-by-pulse current limiting with a typical 2.6A threshold when ILIM is left open. This internal protection eliminates the need for external sensing components, reducing BOM count and PCB area while maintaining robust short-circuit immunity.

Can LT1076CR-5#PBF generate negative output voltages?

Yes, LT1076CR-5#PBF can generate negative output voltages by configuring it as a positive-to-negative inverting converter. Its VSW pin is specified to swing 40V below ground, enabling direct connection to center-tapped inductors or transformer secondaries. This capability allows generation of –5V from a +12V or +24V input without additional active components.

What is the thermal resistance of LT1076CR-5#PBF in its TO-220-5 package?

The LT1076CR-5#PBF in the T-package (5-lead TO-220) has θJC = 4°C/W and θJA = 50°C/W under natural convection. These values assume proper mechanical mounting of the metal tab to a heatsink. For continuous 2A operation at elevated ambient temperatures, heatsink sizing must account for the 50°C/W junction-to-ambient rise to maintain TJ ≤ 125°C.

Is LT1076CR-5#PBF pin-compatible with other members of the LT1076 family?

LT1076CR-5#PBF shares the same 5-lead TO-220 pinout (VIN, VSW, GND, SENSE, VC) with LT1076CT-5 and LT1076HVCT-5, making them mechanically and electrically interchangeable in layouts designed for the T package. However, the HV variants support higher input voltage ratings and differ in absolute maximum ratings - substitution requires validation of input voltage stress margins.