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Diodes Incorporated AP1084K18L-13
- Part No.:
- AP1084K18L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
AP1084K18L-13.pdf
- Description:
- IC REG LINEAR 1.8V 5A TO263-2
- Quantity:
- Payment:
- Shipping:
Inventory:1,264
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Product details
Overview
AP1084K18L-13 from Diodes Incorporated is a 5A low-dropout positive fixed-mode voltage regulator with 1.8V output, TO263-3L package, 1.4V max dropout at full load, built-in thermal shutdown and current limiting, designed for high-speed bus termination and low-current 3.3V logic supply in VGA cards and embedded power rails.
For engineers reviewing the AP1084K18L-13 datasheet, AP1084K18L-13 pinout, AP1084K18L-13 application, or AP1084K18L-13 equivalent, key selection criteria include dropout voltage under 5A load, thermal resistance (θJC = 3.5°C/W), output stability with ≥10µF capacitor (ESR 0.15–20Ω), and fixed 1.8V output tolerance of ±2% over temperature and line/load variation.
Technical Context
The AP1084K18L-13 implements a three-terminal LDO architecture with internal 1.25V reference and error amplifier driving a PNP pass transistor. It regulates by maintaining 1.25V between VOUT and ADJ pins - in fixed-mode, ADJ is internally connected to GND, eliminating external resistors.
Its fast transient response stems from optimized internal compensation and low-output-impedance design, enabling stable operation with only 10µF output capacitance. Thermal shutdown activates at 150°C junction temperature, and current limiting engages at ≥5.1A when VIN–VOUT = 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.800 V ±2% (1.764–1.836 V) at 10mA, 25°C, VIN ≥ 3.3V |
| Max Dropout Voltage | 1.4 V at 5A load (ΔVOUT = 1% of 1.8V), enabling 1.8V output from 3.2V input |
| Output Current | 5.0 A continuous; current limit ≥5.1 A ensures safe overload handling |
| Thermal Resistance θJC | 3.5°C/W (TO263-3L case-to-junction), enabling efficient heatsink coupling |
| Load Regulation | 15–18 mV (0–5A), critical for stable core voltage under dynamic CPU/GPU loads |
| Line Regulation | 0.2% (3.3V ≤ VIN ≤ 12V), minimizing output drift across input rail variations |
| Reference Voltage | 1.250 V typical (1.225–1.275 V), basis for precision feedback in adjustable variants |
Pinout & Package
AP1084K18L-13 uses the TO263-3L (D²PAK) thermally enhanced surface-mount package with exposed thermal pad (Tab = VOUT). The 3-pin configuration supports high-current delivery and PCB-level heat dissipation via the tab soldered to a copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj / GND) | Adjust / Ground terminal | In fixed 1.8V mode, internally tied to GND; no external connection required |
| 2 (VOUT) | Regulated output | Tab is electrically connected to VOUT; must be soldered to large copper area for thermal management |
| 3 (VIN) | Input supply | Accepts 3.3–12V DC; requires ≥10µF input capacitor near pin to prevent sag during transients |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout at full load | 1.4V max dropout enables 1.8V output from 3.2V input - ideal for post-regulation from 3.3V rails |
| Integrated protection | Thermal shutdown (150°C) + current limiting (≥5.1A) eliminate need for external fault circuitry |
| Stability with minimal capacitance | Guaranteed stable with ≥10µF aluminum/tantalum output cap (ESR 0.15–20Ω), reducing BOM count |
| Fast transient response | Sub-100µs recovery from 0→5A load step minimizes voltage droop in GPU/VGA memory interfaces |
| RoHS-compliant & green packaging | Lead-free (L suffix) and halogen-free (G suffix) TO263-3L meets IPC-1752 and EU Directive 2002/95/EC |
Applications
| VGA Graphics Card Power | PCIe Slot Termination |
|---|---|
|
Use Scenario: Providing clean 1.8V supply to DDR2/DDR3 memory buffers and TMDS transmitters on discrete graphics cards. IC Role / Device Role / Timing Role: Primary 1.8V LDO regulator delivering up to 5A with <100mV droop during GPU memory bursts. Use Value: Meets Intel VRE specification (±100mV total deviation) without additional output capacitors, reducing board area and cost. |
Use Scenario: Supplying stable 1.8V termination voltage to PCIe Gen2/Gen3 reference clock lines and receiver inputs. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source ensuring signal integrity on high-speed differential pairs. Use Value: 0.2% line regulation and <20mV load regulation maintain timing margin under varying slot loading conditions. |
| Embedded FPGA I/O Bank | Industrial Camera Sensor Interface |
|
Use Scenario: Powering 1.8V I/O banks of Xilinx Spartan-6 or Intel MAX 10 FPGAs in industrial control modules. IC Role / Device Role / Timing Role: Fixed-output LDO supplying configurable I/O voltage with tight initial accuracy and thermal stability. Use Value: ±2% output tolerance over –40°C to +125°C junction range ensures reliable LVCMOS18 signaling across environmental extremes. |
Use Scenario: Delivering regulated 1.8V to CMOS image sensor analog front-end (AFE) and column ADC circuitry. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source preserving SNR in high-resolution (12+ bit) imaging pipelines. Use Value: Good noise rejection and fast transient response suppress switching noise from adjacent digital subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP1084K18G-13 | Same electrical specs; "G" suffix denotes halogen-free (green) molding compound, while "L" is lead-free only | No functional difference in thermal or electrical performance; green compound preferred for strict environmental compliance programs | Select G-suffix if RoHS + halogen-free certification (e.g., IPC-1752 Class 2) is mandated |
| TLV1117-18CDCYR | Lower 800mA output, higher 1.2V dropout, SOT-223 package, no thermal shutdown latch | Suitable only for low-power microcontroller I/O or sensor biasing - not for 5A VGA or FPGA use | Use only for space-constrained, sub-1A applications where thermal mass and peak current are non-critical |
Compared with AP1084K18L-13, the AP1084K18G-13 offers identical regulation and thermal performance with added halogen-free assurance, while TLV1117-18CDCYR serves only low-current roles due to its 800mA limit and higher dropout - making it unsuitable for high-power graphics or FPGA applications.
Availability
AP1084K18L-13 is available at Aetrix Electronics and suitable for VGA graphics card power, PCIe slot termination, and embedded FPGA I/O bank designs requiring stable component supply with guaranteed 5A output and thermal robustness.
Supply support for AP1084K18L-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 high-reliability 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 conversion - specifically engineered for graphics, memory interface, and FPGA I/O supply where thermal efficiency and transient response are critical.
FAQ
Is AP1084K18L-13 pin-compatible with other AP1084 fixed-voltage variants?
Yes - all AP1084 fixed-output versions (1.5V, 1.8V, 2.5V, 3.3V, 5.0V) share identical TO263-3L pinout and thermal pad layout. Only the output voltage differs; no changes to PCB footprint or external components are needed when swapping between fixed variants.
What is the minimum output capacitance required for stability?
The AP1084K18L-13 requires a minimum 10µF aluminum or tantalum capacitor at the VOUT pin with ESR between 0.15Ω and 20Ω. Ceramic capacitors alone are insufficient due to ultra-low ESR; a parallel RC network or polymer capacitor may be used if ceramic is preferred.
Can AP1084K18L-13 be used in adjustable mode?
No - the "K18" suffix indicates factory-trimmed fixed 1.8V output. Internally, the ADJ pin is connected to GND. To use adjustable mode, select AP1084K-13 (blank VOUT code) and add R1/R2 per the formula VOUT = 1.25(1 + R2/R1) + 55µA·R2.
Does AP1084K18L-13 require a heatsink in 5A operation?
Yes - with θJA = 60°C/W (TO263-3L on FR-4, 2oz copper), 5A operation at 3.3V input yields ~7.5W dissipation, raising junction temperature ~450°C above ambient. A heatsink or large copper pour (≥4 cm²) is mandatory to keep TJ ≤ 125°C under continuous load.
AP1084K18L-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263
AP1084K18L-13 FAQ
1.How can I place an order for AP1084K18L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1084K18L-13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AP1084K18L-13 reliable?
The price and inventory of AP1084K18L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1084K18L-13 is usually 5 days.
3.What payment methods are accepted for AP1084K18L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1084K18L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1084K18L-13?
AP1084K18L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1084K18L-13 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AP1084K18L-13?
For technical support, including AP1084K18L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1084K18L-13 requirements.
6.How does Aetrix verify that AP1084K18L-13 is sourced from the original manufacturer or authorized distributors?
All AP1084K18L-13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP1084K18L-13 meets industry standards.
7.What is the process for return or replacement of AP1084K18L-13?
All AP1084K18L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1084K18L-13, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AP1084K18L-13 part is unused and in its original packaging.
Return procedure for AP1084K18L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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