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Diodes Incorporated AP1084D18L-13
- Part No.:
- AP1084D18L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AP1084D18L-13.pdf
- Description:
- IC REG LINEAR 1.8V 5A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,733
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Product details
Overview
AP1084D18L-13 from Diodes Incorporated is a 5A low-dropout linear regulator in TO252-3L package, delivering fixed 1.8V output with ≤1.4V dropout at full load, ±1.5% initial output tolerance, and built-in thermal shutdown and current limiting. It powers high-speed bus termination and low-current 3.3V logic supplies in VGA cards and embedded systems requiring stable low-voltage regulation from 3.3V–12V input.
For engineers reviewing the AP1084D18L-13 datasheet, AP1084D18L-13 pinout, AP1084D18L-13 application, or AP1084D18L-13 equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and confirmed alternative parts with functional trade-offs.
Technical Context
The AP1084D18L-13 operates as a fixed-output LDO with internal 1.25V reference and precision error amplifier. Its architecture supports fast transient response (≤100μs recovery from 0→5A step) and maintains regulation with only 1.4V VIN–VOUT differential at 5A load.
It integrates overcurrent protection triggering at ≥5.1A and thermal shutdown at 150°C junction temperature. Output stability requires ≥10μF capacitor with ESR between 0.15Ω and 20Ω, directly connected to VOUT and GND per layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.800V ±1.5% at 10mA, 25°C - ensures compatibility with 1.8V core logic rails without external resistors. |
| Dropout Voltage | 1.4V max at 5A load - enables stable 1.8V output from as low as 3.2V input supply (e.g., single-cell Li-ion + LDO). |
| Output Current | 5.0A continuous - supports high-current FPGA I/O banks or GPU memory interfaces without derating. |
| Line Regulation | 0.2% typical - limits output drift to ±3.6mV across 3.3V–12V input range, critical for noise-sensitive analog subsystems. |
| Load Regulation | 15–18mV over 0–5A - guarantees ≤1% output deviation under full dynamic load, meeting Intel VRE-compliant transient specs. |
| Thermal Resistance θJA | 73°C/W (TO252-3L, FR-4, 2oz Cu) - dictates minimum heatsink area required to maintain Tj <125°C at 5A with 5V input. |
| Reference Voltage | 1.250V ±2% - sets accuracy baseline for all fixed outputs; used internally to derive 1.8V via trimmed resistor network. |
Pinout & Package
AP1084D18L-13 uses the TO252-3L (DPAK) surface-mount package with exposed thermal pad (Tab = VOUT). The 3-pin configuration supports compact PCB layout and efficient heat transfer to copper planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Adj (GND) | Ground reference / adjust node | Internally tied to GND in fixed-mode; serves as feedback reference point-must be connected to system ground plane with low-inductance path. |
| Pin 2: VOUT | Regulated output | Delivers 1.8V; Tab is electrically connected to this pin-requires direct low-ESR capacitor (≥10μF) mounted within 5mm for stability. |
| Pin 3: VIN | Input supply | Accepts 3.3V–12V input; must remain ≥3.2V (1.8V + 1.4V dropout) under worst-case 5A load to avoid dropout mode. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within ≤100μs after 0→5A load step-reduces required bulk capacitance by up to 50% vs. slower LDOs. |
| Built-in thermal shutdown | Activates at 150°C junction temperature-prevents permanent damage during sustained overload or inadequate heatsinking. |
| Current limiting | Clamps output at ≥5.1A-protects upstream power sources and prevents catastrophic failure during short-circuit events. |
| Low-noise operation | High PSRR (>60dB at 1kHz) and tight load/line regulation-eliminates need for post-regulator filtering in ADC reference supplies. |
| Lead-free & RoHS compliant | Meets EU Directive 2002/95/EC with green molding compound (no Br/Sb)-supports environmentally compliant industrial and consumer designs. |
Applications
| VGA Graphics Card Power | FPGA Core Voltage Supply |
|---|---|
|
Use Scenario: Providing clean 1.8V rail to GPU memory interface and pixel processing units on discrete graphics cards. IC Role / Device Role / Timing Role: Primary voltage regulator converting 5V or 12V board supply into stable 1.8V for high-speed DDR memory and logic blocks. Use Value: 5A capability and <100μs transient response prevent voltage droop during burst pixel rendering, avoiding frame corruption or timing violations. |
Use Scenario: Delivering regulated 1.8V to FPGA I/O banks supporting LVDS, SSTL, or HSTL signaling standards. IC Role / Device Role / Timing Role: Fixed-output LDO ensuring precise voltage margin for I/O transceivers operating at >200MHz data rates. Use Value: ±1.5% output tolerance and 15mV load regulation guarantee signal integrity margins are maintained across process/voltage/temperature corners. |
| Industrial Embedded Controller | Automotive Infotainment Module |
|
Use Scenario: Powering ARM Cortex-M7 microcontroller cores and peripheral interfaces in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Main system regulator supplying 1.8V to MCU core and USB PHY, interfacing with 3.3V/5V backplane. Use Value: Thermal shutdown and current limiting enable reliable operation in unventilated enclosures with ambient temperatures up to 85°C. |
Use Scenario: Generating 1.8V for display driver ICs and audio codec digital cores in head-unit infotainment systems. IC Role / Device Role / Timing Role: Secondary LDO downstream of buck converter, providing isolated low-noise rail for sensitive mixed-signal circuits. Use Value: High PSRR and low output noise (<50μVRMS) prevent audible artifacts in Class-D amplifier outputs and visual noise on TFT displays. |
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 |
|---|---|---|---|
| AP1084K18L-13 | Same electrical specs, TO263-3L (D2PAK) package with lower θJA (60°C/W) and larger thermal pad. | Better thermal performance in high-power-density layouts; requires larger PCB footprint and different reflow profile. | Select when junction temperature exceeds 110°C in TO252 layout or when forced-air cooling is unavailable. |
| TLV1117-18CDCYR | 1A rated, SOT-223 package, 1.2V dropout at 1A, ±2% output tolerance, no integrated current limit. | Suitable only for low-current peripherals (e.g., sensors, UARTs); lacks thermal shutdown and 5A capability. | Use only in space-constrained, sub-1A applications where cost is prioritized over robustness and power density. |
Compared with AP1084D18L-13, AP1084K18L-13 offers superior thermal management in thermally limited environments, while TLV1117-18CDCYR provides a smaller, lower-cost option strictly for ≤1A loads-neither matches the 5A/1.4V-dropout combination in the same TO252 footprint.
Availability
AP1084D18L-13 is available at Aetrix Electronics and suitable for VGA graphics cards, FPGA power delivery, industrial PLCs, and automotive infotainment modules requiring stable component supply with full production traceability and long-term lifecycle support.
Supply support for AP1084D18L-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 automotive markets.
The AP1084 series belongs to Diodes' high-current LDO portfolio, engineered specifically for low-voltage, high-current applications such as bus termination, logic supply, and graphics subsystems where dropout voltage and transient response are critical.
FAQ
What is the minimum input voltage required for AP1084D18L-13 to regulate at full 5A load?
The device requires VIN ≥ VOUT + dropout voltage. With a maximum dropout of 1.4V at 5A, the minimum input is 1.8V + 1.4V = 3.2V. Operation below this causes dropout mode and unregulated output. Input must also meet datasheet's absolute maximum rating (≤12V) and recommended operating range (≥3.3V for 1.8V fixed version).
Can AP1084D18L-13 be used in adjustable mode?
No. AP1084D18L-13 is factory-trimmed for fixed 1.8V output. The "D" prefix denotes TO252-3L package and "18" specifies 1.8V fixed mode; the ADJ pin is internally connected to GND. For adjustable operation, select AP1084DxxL-13 with blank suffix (e.g., AP1084DL-13) and use external R1/R2 divider.
What output capacitor is required for stability?
A minimum 10μF aluminum or tantalum capacitor with ESR between 0.15Ω and 20Ω must be placed directly between VOUT and GND, within 5mm of the pins. Ceramic capacitors alone are insufficient due to ultra-low ESR; a parallel RC network or polymer capacitor may be used if aluminum/tantalum is unavailable.
Is AP1084D18L-13 suitable for automotive applications?
While not AEC-Q200 qualified, AP1084D18L-13 meets key automotive requirements: -40°C to +125°C operating junction range, thermal shutdown, current limiting, and RoHS compliance. It is deployed in infotainment modules but requires external qualification testing for safety-critical systems per ISO 26262.
AP1084D18L-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-252-3
AP1084D18L-13 FAQ
1.How can I place an order for AP1084D18L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1084D18L-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 AP1084D18L-13 reliable?
The price and inventory of AP1084D18L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1084D18L-13 is usually 5 days.
3.What payment methods are accepted for AP1084D18L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1084D18L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1084D18L-13?
AP1084D18L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1084D18L-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 AP1084D18L-13?
For technical support, including AP1084D18L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1084D18L-13 requirements.
6.How does Aetrix verify that AP1084D18L-13 is sourced from the original manufacturer or authorized distributors?
All AP1084D18L-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 AP1084D18L-13 meets industry standards.
7.What is the process for return or replacement of AP1084D18L-13?
All AP1084D18L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1084D18L-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 AP1084D18L-13 part is unused and in its original packaging.
Return procedure for AP1084D18L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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