Diodes Incorporated AZ1084CS-ADJTRG1

Overview

AZ1084CS-ADJTRG1 from Diodes Incorporated is an adjustable 5A low-dropout linear regulator in TO252-2 (3) package, delivering 1.225V to 12V output via external resistors, with 1.35V typical dropout at full load and integrated thermal shutdown and current limiting. It serves as a post-regulator for switch-mode supplies and powers microprocessor cores in embedded systems requiring stable, low-noise DC voltage.

For engineers reviewing the AZ1084CS-ADJTRG1 datasheet, AZ1084CS-ADJTRG1 pinout, AZ1084CS-ADJTRG1 application, or AZ1084CS-ADJTRG1 equivalent, key selection criteria include dropout voltage at 5A, adjust pin current stability over temperature, compatibility with ceramic output capacitors, and thermal resistance (θJC = 7.36°C/W) for PCB heatsink design.

Technical Context

The AZ1084CS-ADJTRG1 uses a trimmed bandgap reference (1.225–1.270V) and internal current-limiting circuitry to maintain regulation under overload. Its feedback loop accepts voltage division from two external resistors connected to the ADJ pin, enabling precise output setting across 1.225V–12V range while maintaining 0.1% typical load regulation.

Thermal protection activates when junction temperature exceeds +150°C, and the device operates continuously from 0°C to +125°C junction temperature. It supports low-ESR ceramic capacitors (≥10µF input, ≥22µF output) and achieves 72dB PSRR at 120Hz with 5A load and 3V headroom.

Key Specifications

Pinout & Package

Package: TO252-2 (3), surface-mount, single-gate thermally enhanced DPAK variant with exposed drain pad for PCB heatsinking. Dimensions: 10.4 × 6.7 × 2.38 mm (L × W × H); weight ≈ 0.312 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1963AEST-ADJ#TRPBF and TPS75733KTTR, the AZ1084CS-ADJTRG1 uniquely combines 5A adjustability, TO252 thermal performance, and 1.35V dropout - making it the only option for compact, high-current, programmable LDO designs where both current and voltage flexibility are mandatory.

Availability

AZ1084CS-ADJTRG1 is available at Aetrix Electronics and suitable for battery charger post-regulation, microprocessor core supply, and SMPS post-regulation requiring stable component supply, long-lifecycle assurance, and RoHS 3–compliant sourcing.

Supply support for AZ1084CS-ADJTRG1 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The AZ1084C series belongs to Diodes' high-current LDO product line, engineered specifically for post-regulation in power-constrained embedded and computing systems where thermal efficiency, noise immunity, and design flexibility are critical.

FAQ

What is the minimum required output capacitance for stable operation?

The AZ1084CS-ADJTRG1 requires ≥22µF ceramic output capacitance with ESR ≤10mΩ for guaranteed stability across all operating conditions. Lower values may cause oscillation under heavy load transients. The datasheet validates performance with 22µF X7R 1206 or larger case size.

Can this regulator be used with input voltages below 3V?

No. The absolute minimum input voltage is 2.85V per the recommended operating conditions, and the device requires ≥1.35V headroom above the desired output to maintain regulation at 5A. For 1.2V output, VIN must be ≥2.55V - but functional margin and startup behavior are not characterized below 2.85V.

How does the ADJ pin current affect output voltage accuracy?

Adjust pin current (55–120µA) flows through the lower resistor (R1) in the feedback divider, introducing a voltage error equal to I_ADJ × R1. To limit this error to <0.5%, R1 should be ≤10kΩ when using the typical 1.25V reference. Higher R1 values degrade accuracy and increase temperature drift.

Is thermal pad soldering required for rated 5A operation?

Yes. The exposed thermal pad (Pin 2 tab) must be soldered to ≥4 cm² of 2-oz copper with ≥4 thermal vias to internal ground planes. Without this, θJA rises from ~60°C/W to >100°C/W, causing thermal shutdown at <3A continuous load per datasheet thermal characterization.