Diodes Incorporated AZ1084D-ADJTRE1

Overview

AZ1084D-ADJTRE1 from Diodes Incorporated is an adjustable 5A low-dropout linear regulator in TO-252-2 (3) package, delivering 1.225V to 1.270V reference voltage, 1.3V typical dropout at 5A load, and ±0.1% load regulation. It integrates thermal shutdown, current limiting (6.5A), and operates from 0°C to +125°C junction temperature-used for post-regulation after switching supplies in embedded microprocessor power rails.

For engineers reviewing the AZ1084D-ADJTRE1 datasheet, AZ1084D-ADJTRE1 pinout, AZ1084D-ADJTRE1 application, or AZ1084D-ADJTRE1 equivalent, key selection criteria include dropout voltage under full 5A load, adjust-pin current stability across temperature, thermal resistance of the TO-252-2 (3) package, and compatibility with external resistor networks for precise output voltage setting.

Technical Context

The AZ1084D-ADJTRE1 implements a trimmed band-gap reference with internal current limiting and on-chip thermal protection circuitry. Its feedback loop uses an ADJ pin referenced to a stable 1.225–1.270V internal reference, enabling output voltage adjustment via two external resistors per V_OUT = V_REF × (1 + R2/R1) + I_ADJ × R2.

It operates with input voltages up to 12V and requires minimum load current of 3mA at 125°C. The device exhibits 72dB PSRR at 120Hz with 25µF tantalum output capacitance and maintains line regulation of 0.015% (typical) over 2.85–10V input range.

Key Specifications

Pinout & Package

Package: TO-252-2 (3), surface-mount, lead-free, RoHS-compliant, with exposed thermal pad connected to GND/ADJ terminal.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable 5A LDO applications.

Compared with LT1963AEST-3.3#TRPBF and TPS75733KTTT, AZ1084D-ADJTRE1 uniquely supports 5A adjustable output with 1.3V dropout and TO-252-2 (3) thermal performance-making it the only option for high-current, programmable post-regulation where board space and heatsink constraints apply.

Availability

AZ1084D-ADJTRE1 is available at Aetrix Electronics and suitable for microprocessor core supply, battery charger post-regulation, and industrial FPGA I/O bank supply requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AZ1084D-ADJTRE1 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AZ1084 series belongs to Diodes' high-current LDO product line, engineered specifically for post-regulation in power systems where low dropout, thermal robustness, and adjustable output are essential for embedded and computing applications.

FAQ

What is the recommended input-to-output voltage differential for stable operation?

The AZ1084D-ADJTRE1 requires a minimum VIN–VOUT differential of 1.5V to guarantee 5A output across temperature and load. At 25°C and 5A, 1.3V dropout is typical-but design margin must accommodate worst-case 1.5V dropout and thermal derating. Input voltage must not exceed 12V absolute maximum.

Can ceramic capacitors be used for input and output filtering?

Yes-ceramic capacitors are fully supported. A minimum 10µF X5R/X7R ceramic capacitor is required at the INPUT pin, and ≥22µF low-ESR ceramic (e.g., 1206 22µF/10V) is recommended at OUTPUT. No series resistor or ESR requirement applies, unlike older LDO architectures.

How does the ADJ pin current affect output voltage accuracy?

I_ADJ ranges from 55µA to 120µA and flows through R2 in the feedback divider, contributing error term I_ADJ × R2. To hold this error ≤1%, R2 should be ≤1.2kΩ when V_REF = 1.25V and target V_OUT = 3.3V. Higher R2 values degrade accuracy but reduce divider power loss.

Is AZ1084D-ADJTRE1 still in active production?

No-AZ1084D-ADJTRE1 is marked obsolete by Diodes Incorporated (DS36598 Rev. 4, Nov 2021). The recommended replacement is AZ1084C-series (e.g., AZ1084CD-ADJTRE1), which maintains pin compatibility, identical electrical specs, and enhanced process reliability while retaining TO-252-2 (3) packaging.