Diodes Incorporated AZ1084CS2-ADJTRE1

Overview

AZ1084CS2-ADJTRE1 from Diodes Incorporated is an adjustable 5A low-dropout linear regulator in TO252-2 (3) package, delivering stable output voltage via external resistor divider with 1.225V reference and 1.35V typical dropout at full load. It integrates thermal shutdown, current limiting (6.5A), and supports ceramic output capacitors for high-efficiency post-regulation in microprocessor supplies and battery chargers.

For engineers reviewing the AZ1084CS2-ADJTRE1 datasheet, AZ1084CS2-ADJTRE1 pinout, AZ1084CS2-ADJTRE1 application, or AZ1084CS2-ADJTRE1 equivalent, key selection criteria include dropout voltage at 5A, adjust-pin current stability over temperature, line/load regulation performance, thermal resistance (θJC = 7.36°C/W), and compatibility with low-ESR ceramic capacitors in compact PCB layouts.

Technical Context

The AZ1084CS2-ADJTRE1 uses a trimmed bandgap reference (1.225V typ) and internal current-limiting circuitry to maintain regulation under overload while preventing thermal runaway. Its dropout behavior is characterized across junction temperature (0°C to +125°C) and load current (0–5A), with guaranteed 1.5V max dropout at 5A.

It operates with input voltages up to 12V and requires only two external resistors for output voltage setting (VOUT = VREF × (1 + R2/R1) + IADJ × R2). The ADJ pin draws 55–120µA with ±5µA variation over load and dropout range, enabling precise feedback design without significant error contribution.

Key Specifications

Pinout & Package

Package: TO252-2 (3), surface-mount, thermally enhanced DPAK variant with exposed drain pad (pin 2) for efficient heat transfer to PCB copper.

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 AZ1084CS2-ADJTRE1 uniquely balances 5A adjustability, TO252 thermal performance, and cost-effective ceramic-capacitor compatibility-making it optimal for high-current, field-programmable power rails where both headroom and layout simplicity matter.

Availability

AZ1084CS2-ADJTRE1 is available at Aetrix Electronics and suitable for microprocessor core supplies, battery charger post-regulation, and industrial PLC I/O power requiring stable component supply, long-term lifecycle assurance, and RoHS/Green compliance.

Supply support for AZ1084CS2-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AZ1084C series targets high-current linear regulation in space-constrained, thermally demanding environments-designed specifically for post-regulation, battery charging, and processor supply applications where low dropout and robust thermal protection are mandatory.

FAQ

What is the minimum required output capacitance for stability?

The AZ1084CS2-ADJTRE1 is stable with ≥22µF ceramic output capacitance (X5R/X7R, 10V rating) and ESR ≤10mΩ. Lower values risk oscillation under transient load; adding a 10µF tantalum in parallel improves surge immunity but is not required for basic stability.

Can this device replace fixed-output variants like AZ1084C-3.3 in existing designs?

No-AZ1084CS2-ADJTRE1 is adjustable-only and requires external resistors to set output voltage. Fixed versions integrate internal dividers; substituting requires redesigning feedback network and verifying loop stability, load regulation, and thermal performance at the new VOUT.

How does thermal shutdown behave during overload?

When junction temperature reaches +150°C, the device enters thermal shutdown, disabling output. It remains latched off until TJ drops below +135°C (typical hysteresis), then resumes regulation automatically-no external reset or power cycle is needed.

Is the ADJ pin compatible with remote sensing configurations?

Yes-the ADJ pin supports Kelvin sensing: connect ADJ directly to the load-side of the output capacitor using separate traces, while routing OUTPUT to the capacitor's source-side. This compensates for PCB trace resistance, maintaining ±0.1% regulation accuracy under high-current conditions.