Diodes Incorporated AP1084K25L-13

Overview

AP1084K25L-13 from Diodes Incorporated is a 5A low-dropout linear regulator in TO263-3L package, fixed 2.5V output, with 1.4V max dropout at full load, ±2% output voltage tolerance, and integrated thermal shutdown and current limiting. It delivers stable 2.5V/5A power for high-speed bus termination and VGA card logic supplies.

For engineers reviewing the AP1084K25L-13 datasheet, AP1084K25L-13 pinout, AP1084K25L-13 application, or AP1084K25L-13 equivalent, key selection factors include dropout voltage under 5A load, thermal resistance (θJC = 3.5°C/W), fixed-output accuracy, stability with ≥10µF output capacitor, and TO263-3L thermal pad mounting requirements.

Technical Context

The AP1084K25L-13 operates as a fixed-output LDO with internal 1.25V reference and precision resistor divider network, enabling 2.5V output with ±2% initial tolerance across temperature and load. Its control loop maintains regulation with ≤1.4V VIN–VOUT differential at 5A, supporting input ranges from 4V to 12V.

It integrates protection circuitry including foldback current limiting (5.1A typical) and thermal shutdown at 150°C junction temperature. Stability relies on ≥10µF output capacitance (ESR 0.15–20Ω), and layout requires direct thermal tab connection to PCB copper for θJA = 60°C/W performance.

Key Specifications

Pinout & Package

AP1084K25L-13 uses the TO263-3L (D²PAK) thermally enhanced surface-mount package with exposed thermal pad. The case (tab) is electrically connected to VOUT and must be soldered to a large PCB copper area for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1084K25L-13, AP1084K25G-13 offers identical performance with halogen-free packaging, while TLV1117-25CDCYR trades 5A capability and TO263 thermal efficiency for smaller footprint and lower cost in sub-3A designs.

Availability

AP1084K25L-13 is available at Aetrix Electronics and suitable for VGA graphics cards, FPGA I/O power, high-speed bus termination, and industrial camera sensor interfaces requiring stable component supply and long-term manufacturability.

Supply support for AP1084K25L-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 linear regulation for demanding point-of-load applications where switching noise is unacceptable and thermal efficiency is critical.

FAQ

What is the minimum input voltage required for AP1084K25L-13 to regulate at full 5A load?

The AP1084K25L-13 requires VIN ≥ VOUT + 1.4V = 3.9V to maintain regulation at 5A. Operation below this differential causes dropout, resulting in unregulated output proportional to (VIN – 1.4V). Input must be ≥4V for guaranteed 2.5V/5A output.

Can AP1084K25L-13 be used in adjustable mode?

No - AP1084K25L-13 is factory-configured as a fixed 2.5V output device. The "K25" suffix denotes fixed 2.5V; adjustable versions use blank suffix (e.g., AP1084K-13) and require external R1/R2 resistors. Pin 1 (Adj/GND) is internally grounded and must not be connected externally.

What is the recommended PCB layout for thermal performance?

Maximize thermal performance by soldering the exposed thermal tab (pin 2/VOUT) to ≥4 cm² of 2oz copper on an inner layer, using ≥4 thermal vias (0.3mm diameter) to inner ground plane. Keep input/output capacitors within 5mm of respective pins and route high-current paths with ≥1mm trace width.

Does AP1084K25L-13 require an input capacitor?

Yes - a minimum 10µF aluminum or tantalum capacitor (low ESR) is recommended between VIN and GND, placed within 10mm of the device. This prevents input voltage sag during load transients and reduces noise coupling from upstream supplies, especially when fed from switchers.