Diodes Incorporated AZ2117H-ADJTRG1

Overview

AZ2117H-ADJTRG1 from Diodes Incorporated is an adjustable low-dropout linear regulator optimized for low-voltage, high-transient-response applications with ±1% output voltage accuracy, 1.35A typical current limit, and thermal shutdown protection. It operates from −40°C to +125°C junction temperature and supports output voltage setting via two external resistors - used in USB devices, PC motherboards, and add-on cards where stable, low-noise power delivery is critical.

For engineers reviewing the AZ2117H-ADJTRG1 datasheet, AZ2117H-ADJTRG1 pinout, AZ2117H-ADJTRG1 application, or AZ2117H-ADJTRG1 equivalent, key selection criteria include dropout voltage (1.3V typ at 1A), PSRR (60dB at 120Hz), output noise (0.003% of VOUT), quiescent current (≤1mA), and SOT223 package compatibility with low-ESR ceramic capacitors.

Technical Context

The AZ2117H-ADJTRG1 employs an internal trimmed bandgap reference and PNP pass transistor architecture to achieve low dropout and high line/load regulation. Its feedback loop uses the ADJ pin to sense output voltage through an external resistor divider, enabling precise output adjustment across a wide range.

Thermal protection is implemented via on-chip sensing with +170°C shutdown threshold and +20°C hysteresis. The device maintains stability with ≥1µF ceramic output capacitance (ESR < 20Ω) and requires no minimum load for ADJ version operation above 0.3mA.

Key Specifications

Pinout & Package

The AZ2117H-ADJTRG1 is housed in an industry-standard SOT223 surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin 1 is INPUT, Pin 2 is OUTPUT, Pin 3 is ADJ/GND - the ADJ pin serves as feedback reference node for adjustable output configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3302E/MB and TLV1117-ADJ, the AZ2117H-ADJTRG1 delivers superior noise performance (0.003% vs. ≥0.01%), tighter reference accuracy (±1% vs. ±2%), and better thermal robustness (+170°C shutdown), making it optimal for high-fidelity power domains.

Availability

AZ2117H-ADJTRG1 is available at Aetrix Electronics and suitable for USB device power, PC motherboard auxiliary rails, and add-on card voltage regulation requiring stable component supply, RoHS-compliant packaging, and industrial temperature range support.

Supply support for AZ2117H-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 for industrial, computing, and consumer markets.

The AZ2117 series belongs to Diodes' precision LDO portfolio, engineered specifically for low-voltage, low-noise, high-transient-response applications where input headroom and output stability are constrained.

FAQ

What is the minimum output capacitor required for stable operation?

The AZ2117H-ADJTRG1 requires a minimum 1µF ceramic output capacitor with ESR below 20Ω. This value ensures phase margin and transient stability across the full operating temperature range. Larger values (e.g., 10µF) further improve load-step response but are not mandatory for basic regulation.

Can the AZ2117H-ADJTRG1 be used with input voltages above 15V?

No. The absolute maximum input voltage is 18V, but the recommended operating condition limits VIN to ≤15V. Exceeding 15V risks exceeding power dissipation limits and triggering thermal shutdown, especially at high load currents or elevated ambient temperatures.

How does the ADJ pin function in the feedback network?

The ADJ pin connects to the midpoint of an external resistor divider between VOUT and GND. It references the internal 1.250V bandgap, so VOUT = 1.250V × (1 + R1/R2). The ADJ pin draws only 7–10µA, minimizing divider current error and enabling high-resistance networks for low quiescent power.

Is the SOT223 package thermally adequate for 1.35A continuous operation?

With proper PCB layout - including a 100mm² copper pour connected to the exposed thermal pad via ≥8 vias - the SOT223 achieves θJA ≈ 100°C/W. At 1.35A and 1.3V dropout (1.76W dissipation), junction temperature rise is ~176°C above ambient; thus, operation above 25°C ambient requires derating or heatsinking to stay within the +125°C limit.