Analog Devices Inc. LT1074HVIT#06PBF

Overview

LT1074HVIT#06PBF from Analog Devices (formerly Linear Technology) is a high-voltage 5A monolithic bipolar buck switching regulator with integrated power switch, oscillator, current limit, and analog multiplier feedback control. It operates from 8V to 60V input, delivers adjustable output from 2.5V to 50V, switches at 100kHz, and supports tapped-inductor configurations for 10A output at 5V in industrial power supplies.

For engineers reviewing the LT1074HVIT#06PBF datasheet, LT1074HVIT#06PBF pinout, LT1074HVIT#06PBF application, or LT1074HVIT#06PBF equivalent, key selection criteria include its 60V max input rating, 5A onboard switch, programmable current limit via ILIM pin, micropower shutdown mode (140µA), and true analog multiplier loop for input-voltage-independent gain and fast line transient response.

Technical Context

The LT1074HVIT#06PBF implements a classic positive buck topology enhanced with a true analog multiplier in the feedback path-multiplying error amplifier output by a reference and dividing by VIN-ensuring loop gain stability across input voltage variations. Its Darlington NPN switch can swing 40V below ground, enabling positive-to-negative and tapped-inductor converter topologies.

On-chip pulse-by-pulse current limiting responds within ≈600ns, and frequency downshifting (100kHz → 20kHz) activates when FB drops below 1.3V to maintain control under short-circuit conditions. Shutdown is controlled via a dedicated SHDN pin with dual thresholds: ~2.45V for duty-cycle halt and <0.3V for full micropower mode.

Key Specifications

Pinout & Package

LT1074HVIT#06PBF is supplied in a 7-lead plastic TO-220 package (T7) with formed leads (Flow 06), tab connected to GND. The package provides low thermal resistance (θ_JA = 35°C/W) and mechanical robustness for high-current industrial power stages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3775 and LM5088MHX/NOPB, the LT1074HVIT#06PBF delivers superior line transient response due to its analog multiplier architecture, integrates the power switch to reduce component count, and supports unique topologies like tapped-inductor buck-making it optimal for cost-sensitive, high-dynamic industrial power supplies.

Availability

LT1074HVIT#06PBF is available at Aetrix Electronics and suitable for industrial power supplies, PLC I/O modules, telecom line cards, and factory automation equipment requiring stable component supply, long-term lifecycle support, and high-voltage DC-DC conversion.

Supply support for LT1074HVIT#06PBF 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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1074 family.

The LT1074HVIT#06PBF belongs to Linear's high-voltage monolithic switching regulator product line, designed specifically for rugged industrial and telecom power applications demanding wide input range, integrated protection, and topology flexibility beyond basic buck conversion.

FAQ

What is the maximum input voltage rating for the LT1074HVIT#06PBF?

The LT1074HVIT#06PBF has an absolute maximum input voltage rating of 60V, with guaranteed operation from 8V to 60V. This HV variant exceeds the standard LT1074 (45V max) and supports 48V industrial and telecom systems without external clamping or pre-regulation. Always observe the 64V absolute max switch-to-input voltage rating in all operating conditions.

Can the LT1074HVIT#06PBF be used in a positive-to-negative converter configuration?

Yes, the LT1074HVIT#06PBF supports positive-to-negative conversion due to its VSW pin's ability to swing 40V below ground. When configured as an inverting buck-boost, it generates regulated negative outputs (e.g., –5V from +24V) using standard passive components. Application Note AN44 provides verified schematics and layout guidelines for this topology.

How is current limit set on the LT1074HVIT#06PBF, and what is the default value?

The LT1074HVIT#06PBF's current limit defaults to 6.5A when the ILIM pin is left open. It is programmable downward using an external resistor from ILIM to GND: RLIM = ILIM × 2kΩ + 1kΩ (e.g., 7kΩ sets ~3A). The 7-pin T7 package enables this adjustment; the 5-pin variant does not expose ILIM.

Does the LT1074HVIT#06PBF include built-in protection features?

Yes, the LT1074HVIT#06PBF integrates pulse-by-pulse current limiting (response <600ns), thermal shutdown, undervoltage lockout (startup threshold ~3.5V), and frequency downshifting during overload. Its analog multiplier loop also inherently improves line transient immunity. No external protection ICs are needed for basic overcurrent or input surge events.

What package type and thermal performance does the LT1074HVIT#06PBF use?

The LT1074HVIT#06PBF uses a 7-lead plastic TO-220 package (T7) with formed leads (Flow 06) and GND-connected tab. Its thermal resistance is θ_JA = 35°C/W (with 0.5 in² copper pad), enabling 5A operation at up to 85°C ambient without forced airflow. Derating curves in the datasheet specify safe operating area versus temperature.