Diodes Incorporated AZ1085S-ADJTRE1

Overview

AZ1085S-ADJTRE1 from BCD Semiconductor Manufacturing Limited is an adjustable 3A low-dropout linear regulator in TO-263-3 package, featuring 1.3V typical dropout at full load, on-chip thermal shutdown, and ±1.5% output voltage accuracy over 0–125°C junction temperature. It delivers stable post-regulation for switching supplies and microprocessor core rails where precision and thermal robustness are critical.

For engineers reviewing the AZ1085S-ADJTRE1 datasheet, AZ1085S-ADJTRE1 pinout, AZ1085S-ADJTRE1 application, or AZ1085S-ADJTRE1 equivalent, key selection criteria include dropout voltage at 3A, thermal resistance (θ_JC = 4.15°C/W), adjustable output configuration via two external resistors, and RoHS-compliant lead-free packaging (E1 suffix).

Technical Context

The AZ1085S-ADJTRE1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, with integrated current limiting (4.5A typical) and thermal protection circuitry. Its architecture supports adjustable output voltages from 1.238V to 10V using R1/R2 feedback network.

Designed for high-current linear regulation, it maintains 0.1% typical load regulation and 0.015% typical line regulation across its operating range. The device operates with input voltages up to 12V and requires minimum 3mA load current for stability in adjustable mode.

Key Specifications

Pinout & Package

Package: TO-263-3 (D²PAK), surface-mount, thermally enhanced with exposed tab connected to OUTPUT pin. Pin 2 (tab) serves as primary heat path and output terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1963AEST-3.3#TRPBF and TPS7A8300RGRT, the AZ1085S-ADJTRE1 offers broader output adjustability and simpler external component requirements at the expense of higher dropout and noise-making it optimal for cost-sensitive, thermally constrained 3A applications where moderate PSRR suffices.

Availability

AZ1085S-ADJTRE1 is available at Aetrix Electronics and suitable for telecom line cards, DVD player AV subsystems, battery charger modules, and industrial microprocessor power supplies requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AZ1085S-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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog IC foundry and fabless designer specializing in high-voltage, high-current power management solutions for industrial, computing, and consumer markets.

The AZ1085 series targets cost-effective, thermally robust linear regulation in space-constrained applications-designed specifically for post-regulation, battery charging, and microprocessor core supply where simplicity, reliability, and thermal performance outweigh ultra-low-noise requirements.

FAQ

What is the minimum load current required for stable operation of AZ1085S-ADJTRE1?

The AZ1085S-ADJTRE1 requires a minimum load current of 3mA at 10V input to maintain regulation stability in adjustable mode. This is specified in the Electrical Characteristics table (I_LOAD(MIN) = 3–10mA). Below this threshold, output voltage may drift or oscillate due to insufficient biasing of the internal bandgap reference and error amplifier.

Can AZ1085S-ADJTRE1 be used with ceramic output capacitors?

Yes-AZ1085S-ADJTRE1 is stable with 10µF to 22µF ceramic output capacitors and does not require minimum ESR. The datasheet explicitly lists ceramic and tantalum types in Typical Applications (Figure 18), confirming compatibility without external compensation components.

How does the ADJ pin current affect output voltage accuracy?

Adjust pin current (I_ADJ = 55–120µA, ∆I_ADJ ≤ 5µA over load/temperature) introduces a small offset error in the feedback network: V_OUT = V_REF(1 + R2/R1) + I_ADJR2. For R2 = 150Ω (typical), this adds ≤18mV error-accounted for in the ±1.5% total output tolerance specification.

Is thermal shutdown latched or auto-recovering?

Thermal shutdown is auto-recovering: the device disables the pass transistor when junction temperature exceeds ~150°C (T_J(max)), cools passively, and resumes regulation once T_J falls below the hysteresis threshold (~140°C). This behavior is confirmed by functional block diagram (Figure 3) and Absolute Maximum Ratings table.