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Diodes Incorporated AP1184T5-L-U
- Part No.:
- AP1184T5-L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-5
- Datasheet:
-
AP1184T5-L-U.pdf
- Description:
- IC REG LINEAR POS ADJ 4A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,835
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Product details
Overview
AP1184T5-L-U from Diodes Incorporated is a 4A ultra-low dropout positive voltage regulator in TO220-5L package, configurable as adjustable or fixed-output (1.5V/1.8V/2.5V/3.3V/5.0V), with 0.85V max dropout at 4A, built-in thermal shutdown and current limiting, designed for GPU core power delivery from 3.3V ATX rails.
For engineers reviewing the AP1184T5-L-U datasheet, AP1184T5-L-U pinout, AP1184T5-L-U application, or AP1184T5-L-U equivalent, key selection criteria include dropout voltage under 4A load, remote sensing capability via Vsense pin, Vctrl biasing requirements, and thermal resistance (θJA = 31°C/W) for TO220-5L mounting on 3in² copper.
Technical Context
The AP1184 employs an NPN pass transistor with externally biased Vctrl pin-separate from Vin-to achieve PNP-class dropout without base-current losses. Its dual-input architecture enables regulation from 3.3V input to 2.5V output while maintaining >60dB ripple rejection at 120Hz.
True remote sensing is implemented via dedicated Vsense pin, enabling load-regulation compensation across PCB trace resistance. The device requires minimum 100µF output capacitance and 100µF Vctrl bypass capacitance for stability under fast 0–4A transients (≤500ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous-supports GPU core loads without derating at TA ≤ 45°C with proper heatsinking. |
| Max Dropout (Vin–Vout) | 0.85V at 4A-enables 2.5V output from 3.3V rail with <1.7W dissipation at full load. |
| Reference Voltage | 1.25V ±2.5%-sets precision of adjustable output via R1/R2 divider; supports 1.25V–15.5V range. |
| Ripple Rejection | 60–70dB at 120Hz-rejects ATX supply ripple without additional filtering stages. |
| Thermal Shutdown | Active above 125°C junction-prevents latch-up during transient overload or inadequate heatsinking. |
| Load Regulation | ≤25mV for 2.5V fixed version (0–4A)-ensures stable GPU VDDQ under dynamic current steps. |
| Control Pin Current | 6–70mA depending on load-dictates minimum Vctrl bypass capacitor (100µF) and routing impedance. |
Pinout & Package
AP1184T5-L-U uses TO220-5L package with exposed tab electrically connected to Vout. Mounting requires isolation from heatsink unless Vout is chassis-ground referenced.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vin | Main power input | Must exceed Vout by ≥0.85V; connects to 3.3V/5V ATX rail; requires ≥1µF local ceramic bypass. |
| Vctrl | Control circuit supply | Must be ≥Vout + 0.5V; supplies base drive for NPN pass transistor; requires 100µF low-ESR capacitor to ground. |
| Vout | Regulated output | Tab-connected output; delivers up to 4A; connects directly to GPU VDDQ rail and bulk capacitance. |
| Vsense | Remote sense input | Connects to load point (e.g., GPU VRM feedback node); compensates for IR drop in PCB traces. |
| Adj (GND) | Adjust reference / GND | Grounded in fixed-mode; connects to resistor divider in adjustable mode; draws 50–150µA. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 0.85V at 4A enables high-efficiency linear regulation from 3.3V to 2.5V without switching noise. |
| True remote sensing | Dedicated Vsense pin eliminates voltage error from PCB trace resistance-critical for GPU core accuracy. |
| Fast transient response | Stable under 0–4A load steps in ≤500ns-meets graphics chipset dynamic current demands. |
| Thermal & current protection | Integrated shutdown at 125°C junction and current limit at 4.2A prevent damage during fault conditions. |
| Flexible biasing | Separate Vctrl pin allows independent 5V supply-decouples control circuitry from noisy Vin rail. |
Applications
| GPU Core Power Supply | ATX Motherboard VRM Auxiliary Rail |
|---|---|
|
Use Scenario: Delivering 2.5V/4A to modern discrete GPU cores from 3.3V ATX auxiliary rail. IC Role / Device Role / Timing Role: Primary linear post-regulator providing low-noise, fast-response DC power with remote sensing. Use Value: Eliminates need for complex multi-phase buck converters while meeting tight ±2% output tolerance under 300ns load transients. |
Use Scenario: Generating 1.8V auxiliary rail for chipset I/O buffers on ATX-compliant motherboards. IC Role / Device Role / Timing Role: Fixed-output LDO supplying stable voltage to memory controllers and PCIe interface logic. Use Value: Achieves <15mV load regulation over 0–4A range, reducing need for large output capacitance and board space. |
| Industrial FPGA I/O Bank Regulator | Test Equipment Precision Analog Supply |
|
Use Scenario: Powering FPGA I/O banks requiring 3.3V/4A with minimal voltage droop during configuration bursts. IC Role / Device Role / Timing Role: Adjustable-mode regulator configured to 3.3V with external resistors and remote sensing. Use Value: Maintains <±0.5% output accuracy across temperature via 1.25V reference and low-drift resistor network. |
Use Scenario: Providing ultra-low-noise 5.0V supply for high-resolution ADC reference circuits in benchtop instruments. IC Role / Device Role / Timing Role: Fixed 5.0V LDO with 70dB ripple rejection suppressing switching noise from upstream DC/DC converters. Use Value: Enables <1 LSB error in 16-bit ADC systems by limiting output ripple to <10µVpp at 120Hz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1963AET-2.5#PBF | 2.5V fixed, 1.5A max, 340mV dropout at 1.5A, no Vctrl pin, higher PSRR (75dB) | Limited to ≤1.5A; lacks remote sensing and dual-input flexibility for ATX 3.3V→2.5V conversion | Select when lower current and superior noise performance outweigh need for 4A capacity and remote sensing. |
| TPS7A8300RGRT | Adjustable, 3A max, 110mV dropout at 3A, integrated PMOS pass element, no separate Vctrl | Cannot support 4A GPU loads; simpler biasing but no true remote sensing-only feedforward compensation | Prefer for compact 3A applications where board space is constrained and Vctrl complexity is undesirable. |
Compared with LT1963AET-2.5#PBF and TPS7A8300RGRT, AP1184T5-L-U uniquely supports 4A output with true remote sensing and dual-rail biasing-making it irreplaceable for legacy ATX GPU power designs requiring 2.5V/4A from 3.3V input.
Availability
AP1184T5-L-U is available at Aetrix Electronics and suitable for GPU power delivery, ATX motherboard auxiliary rails, industrial FPGA I/O regulation, and test equipment analog supply requiring stable component supply with long-lifecycle support.
Supply support for AP1184T5-L-U 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 and manufacturing operations across Asia and the Americas.
The AP1184 belongs to Diodes' high-current LDO regulator product line, engineered specifically for graphics processing unit (GPU) and chipset power delivery in ATX-compliant computing platforms.
FAQ
What is the minimum required capacitor on the Vctrl pin?
A minimum 100µF low-ESR aluminum electrolytic capacitor is required between Vctrl and ground to ensure loop stability under full 4A load transients. This value is derived from empirical testing in the datasheet's stability section and cannot be reduced without risking oscillation during fast load steps.
Can AP1184T5-L-U operate with Vin = Vout?
No. The device requires a minimum headroom: Vin must exceed Vout by at least 0.26V (at 1.5A) to 0.85V (at 4A) to maintain regulation. Operation at Vin = Vout violates the absolute maximum rating and will cause unregulated output or thermal shutdown.
Is remote sensing mandatory for stable operation?
No-remote sensing is optional but strongly recommended for loads >2A or PCB trace lengths >2cm. When Vsense is tied to Vout, the regulator operates in local-sense mode with degraded load regulation (e.g., ±25mV vs ±5mV with remote sense for 2.5V version).
Why does AP1184 require a separate Vctrl supply?
The Vctrl pin powers the internal control circuitry and provides base drive to the NPN pass transistor. Separating it from Vin avoids injecting switching noise into the control loop and enables use of a cleaner 5V rail-improving PSRR and transient immunity compared to single-supply LDOs.
AP1184T5-L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 15.5V
- Voltage Dropout (Max):
- 0.85V @ 4A
- Current - Output:
- 4A
- Current - Quiescent (Iq):
- 25 mA
- Current - Supply (Max):
- 70 mA
- PSRR:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
AP1184T5-L-U FAQ
1.How can I place an order for AP1184T5-L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1184T5-L-U 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 AP1184T5-L-U reliable?
The price and inventory of AP1184T5-L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1184T5-L-U is usually 5 days.
3.What payment methods are accepted for AP1184T5-L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1184T5-L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1184T5-L-U?
AP1184T5-L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1184T5-L-U 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 AP1184T5-L-U?
For technical support, including AP1184T5-L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1184T5-L-U requirements.
6.How does Aetrix verify that AP1184T5-L-U is sourced from the original manufacturer or authorized distributors?
All AP1184T5-L-U 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 AP1184T5-L-U meets industry standards.
7.What is the process for return or replacement of AP1184T5-L-U?
All AP1184T5-L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1184T5-L-U, 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 AP1184T5-L-U part is unused and in its original packaging.
Return procedure for AP1184T5-L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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