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Diodes Incorporated AP1186K5-25G-13
- Part No.:
- AP1186K5-25G-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1186K5-25G-13.pdf
- Description:
- IC REG LINEAR 2.5V 1.5A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,849
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Product details
Overview
AP1186K5-25G-13 from Diodes Incorporated is a 1.5A ultra-low dropout positive voltage regulator in TO263-5L package, fixed at 2.5V output, with 0.38V max dropout at 1.5A load, built-in thermal shutdown and current limiting, designed for GPU core supply in ATX-based motherboards requiring stable 2.4–2.7V rails.
For engineers reviewing the AP1186K5-25G-13 datasheet, AP1186K5-25G-13 pinout, AP1186K5-25G-13 application, or AP1186K5-25G-13 equivalent, key selection criteria include dropout voltage under full load, remote sensing capability via Vsense pin, thermal resistance (2.5°C/W junction-to-case), control pin (Vctrl) biasing requirements, and minimum output capacitance (100µF).
Technical Context
The AP1186K5-25G-13 uses an NPN pass transistor architecture with externally biased Vctrl pin-enabling lower dropout than PNP regulators while avoiding base-current-related inefficiency. Its separate Vsense and Vout pins support true remote sensing to compensate for PCB trace IR drop.
It delivers fast transient response (300–500ns current step handling) and 70dB ripple rejection at 120Hz, meeting tight voltage tolerance requirements of graphics processors. The device operates with Vin ≥ 3.0V and requires Vctrl > Vout by ≥1V for regulation stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% (2.45–2.55V), verified at 10mA load and 25°C. |
| Max Dropout Voltage | 0.38V at 1.5A load, enabling regulation from 3.3V input down to 2.5V output with margin. |
| Load Regulation | 20–25mV over 0–1.5A load range, critical for GPU dynamic current steps. |
| Ripple Rejection | 70dB at 120Hz, suppressing ATX supply noise before sensitive logic cores. |
| Thermal Resistance θJC | 2.5°C/W (junction-to-case), enabling direct heatsink mounting on TO263 tab (Vout-connected). |
| Control Pin (Vctrl) Requirement | Vctrl must exceed Vout by ≥1V (e.g., 5V supply for 2.5V output), powering internal bias and NPN base drive. |
| Stability Capacitance | Minimum 100µF aluminum electrolytic at Vout, with ESR 50–100mΩ, ensures loop stability and transient response. |
Pinout & Package
AP1186K5-25G-13 is housed in a surface-mount TO263-5L package with exposed metal tab electrically connected to Vout for thermal conduction and low-inductance output path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vout (Pin 1 & Tab) | Regulated output terminal | Primary power delivery node; tab is electrically tied to Pin 1 and serves as thermal interface and low-impedance return path. |
| Vsense (Pin 2) | Remote sense input | Connects directly to load point to compensate for PCB trace voltage drop; enables ±0.5% load regulation accuracy at point-of-load. |
| Adj (GND) (Pin 3) | Reference ground / adjust node | Ground reference for internal 1.25V bandgap; shorted to GND in fixed-mode variants (not used for voltage setting in AP1186K5-25G-13). |
| Vctrl (Pin 4) | Internal control circuit supply | Bias source for internal error amplifier and NPN base drive; must be ≥1V above Vout and decoupled with ≥100µF capacitor. |
| Vin (Pin 5) | Main input supply | High-side input from ATX 3.3V rail; must remain > Vout + dropout (≥2.88V) during transients to avoid dropout. |
Key Features
| Feature | Design Value |
|---|---|
| True remote sensing | Vsense pin enables <0.5% load regulation error at point-of-load, eliminating PCB trace IR drop impact on GPU core voltage. |
| Ultra-low dropout architecture | 0.38V max (Vin–Vout) at 1.5A allows efficient 3.3V→2.5V conversion without switching losses or EMI. |
| Dual-input flexibility | Vctrl pin accepts independent 5V supply (e.g., ATX 5V rail), decoupling control bias from main input and improving PSRR. |
| Fast transient response | Supports 300–500ns current steps typical of GPU core switching, reducing required bulk capacitance at load. |
| Integrated protection | Thermal shutdown triggers at ~150°C junction; current limit activates at 1.6A, preventing damage during overload or short-circuit. |
Applications
| GPU Core Power Supply | ATX Motherboard VRM Auxiliary Rail |
|---|---|
|
Use Scenario: Providing tightly regulated 2.5V supply to discrete graphics processor cores on PCIe-based motherboards using ATX 3.3V/5V rails. IC Role / Device Role / Timing Role: Primary linear regulator delivering low-noise, fast-response DC power; Vsense pin monitors voltage directly at GPU package balls. Use Value: Eliminates need for complex multi-phase buck converters for auxiliary rails, reducing BOM cost and layout area while meeting ±2% transient tolerance. |
Use Scenario: Generating stable 2.5V for memory I/O buffers or chipset southbridge peripherals where ATX 3.3V rail exhibits ripple or sag. IC Role / Device Role / Timing Role: Low-noise post-regulator correcting ATX rail imperfections; Vctrl pin powered from cleaner 5V rail improves PSRR. Use Value: Achieves 70dB ripple rejection and <25mV load regulation across temperature, ensuring signal integrity in high-speed interfaces. |
| Industrial FPGA I/O Bank Regulator | Test Equipment Precision Reference Rail |
|
Use Scenario: Supplying configurable 2.5V I/O banks on Xilinx/Intel FPGAs in industrial controllers where switching noise must be avoided near analog sections. IC Role / Device Role / Timing Role: Fixed-output LDO with remote sensing, placed adjacent to FPGA BGA to minimize trace inductance. Use Value: Delivers <0.38V dropout and 2.5V ±2% accuracy without EMI from switching regulators, preserving ADC/DAC performance. |
Use Scenario: Generating clean 2.5V reference for 16-bit DACs or precision ADC front-ends in automated test equipment requiring low drift and noise. IC Role / Device Role / Timing Role: Low-noise, thermally stable voltage source; TO263 tab mounted to copper pour minimizes thermal gradient-induced drift. Use Value: 70dB ripple rejection and 0.02%/W thermal regulation enable sub-LSB accuracy in 16-bit systems over extended temperature ranges. |
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 |
|---|---|---|---|
| AP1186T5-25G-13 | Same die, TO220-5L package with through-hole mounting and higher θJA (45°C/W vs. 25°C/W for TO263). | Preferred for prototyping or legacy through-hole designs; less suitable for high-density SMT GPU boards. | Select when mechanical mounting constraints require through-hole or when board-level heatsinking is impractical. |
| TPS7A4700RGWR | 200mA, 1.2V–20V adjustable, 30µVRMS noise, 0.3V dropout at 150mA - not rated for 1.5A continuous. | Targeted at ultra-low-noise analog rails, not high-current digital loads like GPUs. | Only consider for low-current (<200mA), ultra-low-noise applications; insufficient current capability for AP1186K5-25G-13 use cases. |
Compared with AP1186T5-25G-13, the K5 variant offers superior thermal performance in space-constrained SMT layouts; versus TPS7A4700RGWR, it trades ultra-low noise for 7.5× higher output current and proven GPU transient handling-making it the only validated solution for 2.5V/1.5A ATX auxiliary rails.
Availability
AP1186K5-25G-13 is available at Aetrix Electronics and suitable for GPU core power supplies, ATX motherboard auxiliary rails, and industrial FPGA I/O bank regulation requiring stable component supply, RoHS-compliant packaging, and long-lifecycle availability.
Supply support for AP1186K5-25G-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 computing, industrial, and consumer markets.
The AP1186 product line was engineered specifically for high-current, ultra-low-dropout linear regulation in ATX-based computing platforms-addressing GPU and chipset voltage requirements where switching noise and complexity must be avoided.
FAQ
Can AP1186K5-25G-13 operate without the Vctrl pin connected?
No. Vctrl must be supplied with a voltage ≥1V above Vout (e.g., 5V for 2.5V output) and decoupled with ≥100µF capacitor. It powers the internal error amplifier and NPN base drive; omission causes immediate regulation failure and potential thermal runaway.
What is the minimum output capacitance required for stability?
A minimum of 100µF aluminum electrolytic capacitor with ESR between 50mΩ and 100mΩ is required at the Vout pin. Lower ESR or capacitance risks oscillation; ceramic capacitors alone are insufficient due to near-zero ESR violating compensation design.
Does the Vsense pin require external filtering or series resistance?
No external filtering or series resistance is recommended. Vsense must connect directly to the load point via dedicated traces; adding impedance degrades remote sensing accuracy. A 10µF capacitor is required from Vsense to GND solely for internal stability-not for filtering.
Is AP1186K5-25G-13 compatible with lead-free reflow profiles?
Yes. It is RoHS-compliant with lead-free finish (per EU Directive Annex Notes 5 and 7) and qualified for standard Pb-free reflow profiles up to peak temperatures of 260°C, matching IPC/JEDEC J-STD-020D requirements for TO263-5L packages.
AP1186K5-25G-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.38V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- 150 µA
- PSRR:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1186K5-25G-13 FAQ
1.How can I place an order for AP1186K5-25G-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1186K5-25G-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 AP1186K5-25G-13 reliable?
The price and inventory of AP1186K5-25G-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1186K5-25G-13 is usually 5 days.
3.What payment methods are accepted for AP1186K5-25G-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1186K5-25G-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1186K5-25G-13?
AP1186K5-25G-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1186K5-25G-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 AP1186K5-25G-13?
For technical support, including AP1186K5-25G-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1186K5-25G-13 requirements.
6.How does Aetrix verify that AP1186K5-25G-13 is sourced from the original manufacturer or authorized distributors?
All AP1186K5-25G-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 AP1186K5-25G-13 meets industry standards.
7.What is the process for return or replacement of AP1186K5-25G-13?
All AP1186K5-25G-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1186K5-25G-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 AP1186K5-25G-13 part is unused and in its original packaging.
Return procedure for AP1186K5-25G-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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