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Diodes Incorporated AP1084DL-13
- Part No.:
- AP1084DL-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AP1084DL-13.pdf
- Description:
- IC REG LINEAR POS ADJ 5A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,974
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Product details
Overview
AP1084DL-13 from Diodes Incorporated is a 5A low-dropout positive adjustable or fixed-mode linear regulator in TO252-3L package, featuring 1.4V maximum dropout at full load, ±1.5% output voltage accuracy (3.3V fixed version), thermal shutdown, and current limiting. It delivers stable 3.3V/5A output from 4.8–12V input and is used in high-speed bus termination and VGA card power supplies.
For engineers reviewing the AP1084DL-13 datasheet, AP1084DL-13 pinout, AP1084DL-13 application, or AP1084DL-13 equivalent, key selection criteria include dropout voltage under 5A load, thermal resistance (θJA = 73°C/W), minimum 10µF output capacitance requirement, and fixed 3.3V output configuration with adjustable mode compatibility via external resistors.
Technical Context
The AP1084DL-13 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling precise 3.3V regulation with 1.25V internal reference and 55µA adjust-pin bias current. Its architecture supports both fixed-output operation (no external resistors) and adjustable mode (via R1/R2 divider), with fast transient response optimized for digital IC supply rails.
Thermal protection activates at 150°C junction temperature, and internal current limiting ensures safe operation up to 5.1A peak. Stability is maintained using ≥10µF output capacitor (ESR 0.15–20Ω), with layout-critical low-inductance VOUT routing recommended to suppress high-frequency oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% at 10mA, 25°C; maintains regulation across 0–5A load range |
| Dropout Voltage | 1.4V max at 5A load; enables 3.3V output from as low as 4.7V input supply |
| Load Regulation | ±26 to ±33mV over 0–5A; critical for maintaining logic-level compliance during CPU/GPU load transients |
| Thermal Resistance θJA | 73°C/W (TO252-3L); requires minimal heatsinking for ≤2W dissipation at 5A with 5V input |
| Reference Voltage | 1.25V typical (1.225–1.275V); sets precision of adjustable mode and defines feedback ratio tolerance |
| Current Limit | 5.1A minimum; protects against short-circuit faults while supporting brief 5A continuous operation |
| Operating Junction Temp | 0–125°C; validated for industrial ambient environments without derating below 100°C |
Pinout & Package
AP1084DL-13 uses the TO252-3L (DPAK) surface-mount package with exposed thermal tab electrically connected to VOUT. The tab must be soldered to a large copper pour for thermal performance and electrical grounding of the output node.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Adjust reference node / Ground return (fixed mode) | In fixed 3.3V mode, this pin is internally tied to GND; in adjustable mode, connects to resistor divider to set output voltage |
| 2 (VOUT) | Regulated output terminal | Primary power output; tab is electrically connected to this pin-must be routed to ground plane for thermal and EMI control |
| 3 (VIN) | Unregulated input supply | Requires ≥1.4V above VOUT to maintain regulation; input capacitor placement directly at this pin minimizes line impedance |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | ≤50µs recovery from 0→5A load step; reduces required bulk capacitance on 3.3V rail by up to 30% |
| Low-noise regulation | Typical PSRR >60dB at 1kHz; suppresses switching noise from upstream DC/DC converters feeding VIN |
| Lead-free & green compound | RoHS-compliant (EU 2002/95/EC), halogen-free molding compound; meets IPC-J-STD-020 moisture sensitivity level 3 |
| Integrated protection | Thermal shutdown + current limiting active simultaneously; prevents latch-up during overload or poor heatsinking |
| Stable with ceramic capacitors | Compatible with ≥10µF X5R/X7R MLCCs (ESR ≥0.15Ω); eliminates need for aluminum electrolytic in space-constrained designs |
Applications
| PCI Express Bus Termination | VGA Graphics Card Core Supply |
|---|---|
|
Use Scenario: Providing stable 3.3V termination voltage for PCIe Gen1/Gen2 differential pairs on motherboard backplanes. IC Role / Device Role / Timing Role: Fixed-output LDO delivering low-noise, low-impedance 3.3V reference to parallel termination resistors. Use Value: Maintains signal integrity with <±33mV load regulation across 0–5A, meeting PCIe spec margin for VTT stability. |
Use Scenario: Powering GPU core logic and memory interface circuitry requiring clean 3.3V at up to 5A peak current. IC Role / Device Role / Timing Role: Primary analog supply regulator for graphics processor I/O banks and display controller subsystems. Use Value: 1.4V dropout enables use of 5V system rail, eliminating need for intermediate 4.5V stage and reducing BOM count. |
| Industrial PLC I/O Module | Network Switch PHY Interface |
|
Use Scenario: Generating isolated 3.3V for digital isolator side and microcontroller peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Secondary regulated supply derived from 5V or 12V field bus, hardened against thermal stress in enclosed enclosures. Use Value: 73°C/W θJA allows operation at full 5A load in 70°C ambient with standard 2oz copper PCB heatsinking-no external heatsink required. |
Use Scenario: Supplying 3.3V to Ethernet PHY transceivers (e.g., Broadcom BCM5461) in managed gigabit switches. IC Role / Device Role / Timing Role: Low-noise, high-current analog supply for PHY analog front-end and clock recovery circuits. Use Value: >60dB PSRR at 1MHz rejects noise from adjacent 25MHz/125MHz clocks, preventing bit-error-rate degradation. |
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 |
|---|---|---|---|
| AP1084K-33L-13 | Same silicon, TO263-3L package (θJA = 60°C/W); larger thermal pad, higher mounting reliability | Better suited for high-reliability industrial systems requiring enhanced thermal margin and mechanical robustness | Select when board space permits larger footprint and long-term thermal cycling reliability is prioritized over cost |
| LD1085V33TR | STMicroelectronics part; 3A rated, 1.3V dropout, TO220 package; lower current, higher θJA (78°C/W) | Acceptable only for ≤3A loads; requires heatsink above 1.5A in ambient >50°C | Choose only for legacy redesigns where TO220 footprint is locked and 3A capacity suffices |
Compared with AP1084DL-13, the TO263 variant offers superior thermal performance for sustained 5A operation, while the LD1085V33TR trades current capability and thermal efficiency for broader distributor availability and mature qualification history in automotive-adjacent industrial use.
Availability
AP1084DL-13 is available at Aetrix Electronics and suitable for PCI Express termination, VGA graphics card power, and industrial PLC I/O modules requiring stable component supply with lead-free compliance and production-ready tape-and-reel packaging.
Supply support for AP1084DL-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
The AP1084 belongs to Diodes' high-current LDO regulator product line, engineered specifically for low-voltage, high-current digital IC supply applications including bus termination, graphics cards, and FPGA auxiliary rails.
FAQ
What is the minimum output capacitance required for AP1084DL-13 stability?
The AP1084DL-13 requires a minimum 10µF output capacitor with ESR between 0.15Ω and 20Ω. Aluminum electrolytic, tantalum, or X5R/X7R ceramic capacitors meeting these specifications ensure loop stability and optimal transient response. Lower ESR values improve ripple rejection but may require series resistance to maintain phase margin.
Can AP1084DL-13 operate in adjustable mode despite being a fixed 3.3V part?
Yes-AP1084DL-13 contains the same internal circuitry as the adjustable AP1084, with the 3.3V feedback network integrated on-die. The ADJ pin is internally connected to ground, but external resistors can override this connection to reconfigure the output voltage within 1.25V to (VIN – 1.4V), provided minimum load current (10mA) is maintained.
Is thermal shutdown latching or auto-recovering?
Thermal shutdown is auto-recovering: when junction temperature exceeds 150°C, the device disables output and remains off until temperature drops ~15°C below threshold (~135°C), then resumes regulation. This behavior prevents thermal runaway during intermittent overload but requires adequate PCB copper area to ensure timely cooldown.
Does AP1084DL-13 support reverse-voltage protection?
No-AP1084DL-13 lacks intrinsic reverse-voltage protection. If VIN falls below VOUT (e.g., during input brownout or hot-swap), reverse current flows from VOUT to VIN through the internal pass transistor's parasitic body diode, potentially damaging upstream circuitry. An external Schottky diode in series with VIN is required for reverse-polarity or back-drive protection.
AP1084DL-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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 10.6V
- 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
AP1084DL-13 FAQ
1.How can I place an order for AP1084DL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1084DL-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 AP1084DL-13 reliable?
The price and inventory of AP1084DL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1084DL-13 is usually 5 days.
3.What payment methods are accepted for AP1084DL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1084DL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1084DL-13?
AP1084DL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1084DL-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 AP1084DL-13?
For technical support, including AP1084DL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1084DL-13 requirements.
6.How does Aetrix verify that AP1084DL-13 is sourced from the original manufacturer or authorized distributors?
All AP1084DL-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 AP1084DL-13 meets industry standards.
7.What is the process for return or replacement of AP1084DL-13?
All AP1084DL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1084DL-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 AP1084DL-13 part is unused and in its original packaging.
Return procedure for AP1084DL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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