Diodes Incorporated AZ2185D-ADJTRG1

Overview

AZ2185D-ADJTRG1 from Diodes Incorporated is an adjustable 3A low-dropout linear regulator in TO252 package, featuring 1.3V typical dropout at full load, 1.225V to 1.275V reference voltage, and integrated thermal shutdown and current limiting. It delivers stable post-regulation for switching supplies and microprocessor core rails with ±0.1%/A load regulation and compatibility with low-ESR ceramic capacitors.

For engineers reviewing the AZ2185D-ADJTRG1 datasheet, AZ2185D-ADJTRG1 pinout, AZ2185D-ADJTRG1 application, or AZ2185D-ADJTRG1 equivalent, key selection criteria include adjustable output via external resistors, 4.5A current limit, -40°C to +125°C operating junction temperature, and RoHS/Green compliance for industrial and telecom power systems.

Technical Context

The AZ2185D-ADJTRG1 employs a band-gap reference with 6μA typical adjust pin current and supports output voltage setting via R1/R2 divider (VOUT = VREF × (1 + R2/R1) + IADJ × R2). Its internal current-limit circuit triggers at 4.5A and thermal shutdown activates at +150°C with +20°C hysteresis.

Designed for high-current linear regulation, it maintains 0.015%/V line regulation and 0.1%/A load regulation across temperature. The device requires ≥10μF output capacitance with ESR < 0.4Ω and operates with input up to 12V, making it suitable for battery-charger and motherboard supply applications where ripple rejection >50dB at 120Hz is critical.

Key Specifications

Pinout & Package

Package: TO252 (Standard), surface-mount, thermally enhanced with exposed drain pad (Pin 2). Thermal resistance θJC = 10°C/W enables high-power dissipation with proper PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2125K-ADJTRG1 and TLV1117-ADJ, the AZ2185D-ADJTRG1 uniquely combines 3A output, 1.3V dropout, and thermal hysteresis - enabling reliable operation in high-power, thermally constrained applications where sustained current delivery and self-protection are mandatory.

Availability

AZ2185D-ADJTRG1 is available at Aetrix Electronics and suitable for battery charger power stages, microprocessor core supplies, and telecom line card power requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AZ2185D-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, specializing in high-reliability power management, signal integrity, and protection solutions.

The AZ2185 series belongs to Diodes' high-current LDO portfolio, engineered specifically for post-regulation, battery charging, and microprocessor supply applications demanding low dropout, thermal resilience, and design simplicity.

FAQ

What is the minimum output capacitor value and ESR requirement for stable operation?

The AZ2185D-ADJTRG1 requires a minimum 10μF output capacitor with ESR below 0.4Ω. Ceramic capacitors meeting these specs ensure stability and optimal transient response. Using capacitors outside this range may cause oscillation or degraded load regulation.

How is the output voltage calculated for the adjustable version?

Output voltage is calculated as VOUT = VREF × (1 + R2/R1) + IADJ × R2, where VREF = 1.225V–1.275V and IADJ = 6μA typical. For example, with R1 = 1.2kΩ and R2 = 3.9kΩ, VOUT ≈ 5.2V. Precision resistors improve accuracy due to IADJ contribution.

Does the device require a minimum load current to maintain regulation?

Yes - a minimum load current of 0.3mA (typical) is required to maintain regulation. This ensures proper biasing of internal circuitry. Applications with intermittent or zero-load conditions should include a bleed resistor to meet this requirement.

What thermal derating applies above +125°C junction temperature?

The device shuts down at +150°C junction temperature with +20°C hysteresis, but its recommended operating range is -40°C to +125°C. Above +125°C, output current must be reduced per the power dissipation curve (max ~18W at 25°C ambient with adequate heatsinking); no guaranteed operation exists beyond TJ = +125°C.