Diodes Incorporated AZ1086S-ADJTRE1

Overview

AZ1086S-ADJTRE1 from BCD Semiconductor Manufacturing Limited is an adjustable 1.5A low-dropout linear regulator in TO-263-3 package, featuring 1.3V typical dropout at full load, on-chip thermal shutdown, and ±1.2% reference voltage accuracy (1.225–1.270V). It delivers stable post-regulation for switching supplies and microprocessor core rails in telecom equipment and set-top boxes.

For engineers reviewing the AZ1086S-ADJTRE1 datasheet, AZ1086S-ADJTRE1 pinout, AZ1086S-ADJTRE1 application, or AZ1086S-ADJTRE1 equivalent, this part supports design of high-efficiency LDO systems requiring precise output adjustability via two external resistors, thermal robustness up to 125°C junction temperature, and ripple rejection of 60–75dB at 120Hz.

Technical Context

The AZ1086S-ADJTRE1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, with internal current limiting (2.3A) and thermal protection that activates at 165°C junction temperature and releases at 135°C. Its architecture enables stable operation with minimum 10μF output capacitance and supports input voltages up to 15V.

Unlike fixed-output variants, the ADJ version uses an external resistor divider between ADJ and GND to set V_OUT = V_REF(1 + R2/R1) + I_ADJR2, where I_ADJ is tightly controlled (60–120μA) and exhibits only 0.2–5μA variation across load and input conditions.

Key Specifications

Pinout & Package

Package: TO-263-3 (D²PAK), surface-mount, thermally enhanced with exposed tab tied to output (pin 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU and LT1963AES8-3.3, AZ1086S-ADJTRE1 offers optimal balance of adjustability, thermal capability (θ_JA = 60°C/W), and cost for mid-power embedded systems-enabling single-BOM flexibility across multiple voltage requirements without sacrificing reliability.

Availability

AZ1086S-ADJTRE1 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial gateways, and consumer STB designs requiring stable component supply with lead-free (RoHS-compliant) packaging and tape-and-reel delivery.

Supply support for AZ1086S-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 power management, LED drivers, and mixed-signal solutions for industrial and consumer markets.

The AZ1086 series targets cost-sensitive, high-reliability linear regulation needs in telecom, computing, and broadband equipment-designed for robust thermal performance and ease of layout in multi-rail power systems.

FAQ

What is the minimum load current required for stable operation of AZ1086S-ADJTRE1?

The AZ1086S-ADJTRE1 specifies a minimum load current of 2–5mA across the full junction temperature range (0–125°C), verified in datasheet Figure 12. This ensures proper biasing of the internal bandgap reference and error amplifier. Below this threshold, output voltage may drift or oscillate, especially with light loads and high-output-capacitance configurations.

Can AZ1086S-ADJTRE1 be used with ceramic output capacitors?

Yes, the AZ1086S-ADJTRE1 is stable with ceramic output capacitors ≥10μF, as confirmed by transient response testing in Figures 13–14. Unlike older LDOs, it does not require ESR-based damping; however, a 10nF ceramic capacitor across the ADJ–GND pins is recommended when using remote sensing to suppress high-frequency noise coupling.

How does thermal shutdown hysteresis affect system recovery behavior?

Thermal shutdown activates at 165°C junction temperature and releases at 135°C (30°C hysteresis), per datasheet page 8. This prevents rapid cycling during overload events. Recovery requires both die cooling below 135°C and sustained input voltage-no external reset is needed, but system firmware should monitor output collapse as an indicator of thermal stress.

What is the impact of adjust pin current (I_ADJ) on output voltage accuracy?

I_ADJ ranges from 60–120μA (typical 90μA) and contributes directly to output error via the term I_ADJ × R2 in V_OUT = V_REF(1 + R2/R1) + I_ADJR2. For R2 = 150Ω (per Figure 12), this adds 9–18mV offset. Using lower R2 values reduces this error but increases power loss and sensitivity to resistor tolerance.