Diodes Incorporated AP1084K15G-13

Overview

AP1084K15G-13 from Diodes Incorporated is a 5A low-dropout positive fixed-mode voltage regulator delivering a precise 1.5V output with ≤1.4V dropout at full load, thermal shutdown, and output current limiting. It uses the TO263-3L package with VOUT-connected thermal tab and supports high-speed bus termination and low-current 3.3V logic supply applications.

For engineers reviewing the AP1084K15G-13 datasheet, AP1084K15G-13 pinout, AP1084K15G-13 application, or AP1084K15G-13 equivalent, key selection criteria include dropout voltage at 5A, thermal resistance (θJC = 3.5°C/W), fixed 1.5V output tolerance (±2%), minimum load current (10mA), and stability with ≥10µF output capacitor (ESR 0.15–20Ω).

Technical Context

The AP1084K15G-13 implements a three-terminal LDO architecture with internal 1.25V reference and precision error amplifier, enabling stable regulation across input voltages from 3.0V to 12V. Its dropout behavior is defined at ΔVOUT = 1% of nominal output, guaranteeing ≤1.4V differential for full 5A load.

Thermal protection activates at 150°C junction temperature, and the device requires no external compensation beyond a minimum 10µF output capacitor with specified ESR range. Load regulation is characterized at constant junction temperature using low-duty-cycle pulse testing to isolate heating effects.

Key Specifications

Pinout & Package

AP1084K15G-13 is housed in a TO263-3L (D²PAK) thermally enhanced surface-mount package with exposed copper thermal pad connected internally to the VOUT terminal. The package supports high-power dissipation and requires PCB copper area for heat spreading per Diodes Inc. AP02001 layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with AP1084K15G-13, AP1084K15L-13 offers identical regulation performance but lacks halogen-free qualification, while TLV1117-15CDCYR trades 5A capacity and TO263 thermal performance for smaller footprint-making the AP1084K15G-13 uniquely suited for high-current, thermally demanding 1.5V rail generation.

Availability

AP1084K15G-13 is available at Aetrix Electronics and suitable for high-speed bus termination, VGA card core supply, and FPGA I/O bank applications requiring stable component supply, long-term lifecycle assurance, and traceable green-material sourcing.

Supply support for AP1084K15G-13 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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP1084 product line delivers high-current, low-dropout regulation for demanding board-level power applications including graphics cards, server memory interfaces, and programmable logic systems-designed specifically to meet fast transient and tight tolerance requirements of modern digital ICs.

FAQ

What is the minimum input voltage required for AP1084K15G-13 to regulate at 5A?

The AP1084K15G-13 requires VIN ≥ 2.9V to maintain regulation at full 5A load, based on its guaranteed 1.4V maximum dropout voltage (1.5V + 1.4V = 2.9V). Operation below this voltage results in unregulated dropout mode with output collapsing linearly toward VIN.

Can AP1084K15G-13 be used in adjustable-output configuration?

No - AP1084K15G-13 is factory-trimmed for fixed 1.5V output. The "K15" suffix denotes TO263-3L package with 1.5V fixed output; adjustable versions use blank suffix (e.g., AP1084K-13) and require external R1/R2 resistors on the Adj pin.

Is an input capacitor required for stable operation?

While not mandatory for basic regulation, a ≥1µF ceramic input capacitor placed near the VIN pin is strongly recommended to suppress high-frequency noise and prevent input voltage sag during rapid 5A load transients, especially when sourced from long PCB traces or high-impedance DC/DC outputs.

How does the thermal tab connection affect PCB layout?

The TO263-3L thermal tab is electrically connected to VOUT, so the PCB copper pour must be tied exclusively to the 1.5V output net-not ground or any other potential. This avoids short circuits and ensures optimal thermal conduction to the heatsink or internal copper plane per Diodes Inc. AP02001 layout guidelines.