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Diodes Incorporated AP1501-50K5G-U
- Part No.:
- AP1501-50K5G-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1501-50K5G-U.pdf
- Description:
- IC REG BUCK 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,681
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Product details
Overview
AP1501-50K5G-U from Diodes Incorporated is a fixed-output 5.0V, 3A non-synchronous PWM buck DC/DC converter in TO263-5 package, operating at 150kHz ±15%, with integrated power switch, thermal shutdown, and ON/OFF control. It delivers regulated 5V output across 7–40V input range and supports industrial power rails in embedded systems requiring compact, cost-effective step-down conversion.
For engineers reviewing the AP1501-50K5G-U datasheet, AP1501-50K5G-U pinout, AP1501-50K5G-U application, or AP1501-50K5G-U equivalent, key selection criteria include its 5V fixed output tolerance (±4%), 3A continuous load capability, 150kHz switching frequency for low EMI filter design, and thermal protection under sustained 3A operation in TO263-5 with θJA = 37°C/W.
Technical Context
The AP1501-50K5G-U implements voltage-mode PWM control with internal 1.235V reference and fixed 150kHz oscillator, enabling stable regulation without external compensation. Its non-synchronous architecture uses an integrated N-channel MOSFET switch and requires an external Schottky catch diode (e.g., B340A) to complete the buck topology.
Feedback is implemented via direct connection of the FB pin to output for fixed versions-no resistor divider needed-while shutdown is asserted by pulling SD pin above 2.0V (logic high), reducing quiescent current to 150–250µA. Thermal shutdown activates at TJ ≥ +150°C, and current limit triggers at 3.6–5.5A peak switch current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over 0.2–3A load and −20°C to +85°C ambient |
| Switching Frequency | 150kHz ±15%; enables use of standard 33–47µH inductors and reduces EMI filtering complexity |
| Max Output Current | 3A continuous; limited by internal switch saturation voltage (1.3–1.5V @ 3A) and thermal design |
| Input Voltage Range | 7V to 40V; supports wide industrial DC bus inputs including 12V, 24V, and 36V systems |
| Efficiency | 80% at VIN = 12V, VOUT = 5V, IOUT = 3A; optimized for mid-load efficiency in distributed power |
| Quiescent Current | 5–10mA in active mode; drops to 150–250µA in shutdown-critical for standby power budgeting |
| Thermal Resistance | θJA = 37°C/W (TO263-5, 3in² copper); requires ≥0.4in² PCB copper pad for safe 3A operation |
Pinout & Package
AP1501-50K5G-U is housed in a RoHS-compliant, halogen-free TO263-5 surface-mount package with exposed metal tab electrically connected to GND for thermal conduction and mechanical anchoring. The tab must be soldered to ≥0.4in² of 2oz copper on the PCB to meet thermal requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply rail | Accepts 7–40V DC; requires local 100µF+ low-ESR input capacitor to suppress switching transients |
| 2 - Output | Internal power switch drain | Swings between ~VIN–1.4V (ON) and ~−0.5V (OFF); connects to inductor and catch diode anode |
| 3 - Gnd | Power and signal ground reference | Common return for VIN, FB, SD, and thermal tab; must be low-impedance, star-connected to minimize noise |
| 4 - FB | Output voltage feedback node | Internally tied to 5V output for fixed version; no external divider required-simplifies layout |
| 5 - SD | Shutdown logic input | Active-high enable: <1.3V = ON, >2.0V = OFF; open or grounded = default ON; 15–25µA input current |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A Power Switch | Eliminates external MOSFET driver and gate drive components-reduces BOM count and layout area |
| Fixed 5V Output with ±4% Tolerance | Guaranteed accuracy across full temperature and load range-enables direct powering of 5V logic without post-regulation |
| 150kHz Fixed-Frequency PWM | Predictable EMI profile and simplified LC filter design using off-the-shelf 33–47µH shielded inductors |
| Thermal Shutdown + Current Limit | Protects against sustained overload or poor heatsinking-prevents latch-up or permanent damage during fault conditions |
| Low Standby Quiescent Current | 250µA max in shutdown-supports battery-backed or energy-sensitive applications requiring ultra-low idle draw |
Applications
| Industrial PLC I/O Module Power | Embedded Controller Core Supply |
|---|---|
|
Use Scenario: Providing isolated 5V rail for digital I/O expansion cards in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V to clean, regulated 5V for microcontroller, optocouplers, and level-shifters. Use Value: Delivers 3A continuously with 80% efficiency at 24V→5V, minimizing heat buildup in confined DIN-rail enclosures without forced airflow. |
Use Scenario: Generating main 5V supply for ARM Cortex-M7-based edge gateway with multiple peripherals and USB interface. IC Role / Device Role / Timing Role: Non-synchronous buck converter supplying core logic voltage; synchronized externally via system clock if needed. Use Value: Fixed 5V output eliminates feedback resistor tuning; TO263-5 package allows dense layout while maintaining thermal margin at 3A load. |
| Point-of-Load Telecom Board | Automotive Body Control Module (BCM) |
|
Use Scenario: Local 5V conversion on telecom line card where space and component count are constrained. IC Role / Device Role / Timing Role: Compact DC/DC stage replacing linear regulators to reduce thermal dissipation in multi-rail backplanes. Use Value: 150kHz switching enables small 33µH inductor and ceramic output capacitors-cutting board area by >40% vs. 500kHz alternatives. |
Use Scenario: Powering microcontroller and CAN transceiver in 12V automotive BCM with cold-crank immunity down to 6V. IC Role / Device Role / Timing Role: Input-stage buck converter handling wide 7–40V input range including load-dump transients up to 40V. Use Value: Absolute maximum VIN = +45V and built-in current limit protect against ISO 7637-2 pulse 5a/b-no external TVS required for basic compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z (Monolithic Power) | 40V max VIN, 3A, adjustable only; requires external feedback resistors; 1.5MHz switching | Higher frequency demands smaller magnetics but increases EMI filtering burden and gate drive losses | Choose when board space is critical and 1.5MHz EMI can be managed; avoid if fixed 5V simplicity is prioritized |
| LM2596S-5.0 (Texas Instruments) | 40V max VIN, 3A, fixed 5V; TO263-5; 150kHz; no SD pin; higher IQ (5mA typical) | Lacks ON/OFF control-requires external FET for true shutdown; less suitable for low-power sleep modes | Prefer when shutdown functionality is unnecessary and TI qualification or long-term availability is required |
Compared with MP1584EN-LF-Z and LM2596S-5.0, the AP1501-50K5G-U uniquely combines fixed 5V output, integrated shutdown control, and proven thermal performance in TO263-5-making it optimal for industrial designs needing reliability, simplicity, and standby power control without redesign overhead.
Availability
AP1501-50K5G-U is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded controller core rails, telecom point-of-load converters, and automotive body control modules requiring stable component supply with guaranteed green (halogen/antimony-free) compliance.
Supply support for AP1501-50K5G-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, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.
The AP1501 belongs to Diodes' legacy high-current buck converter product line, designed specifically for cost-sensitive, thermally constrained applications requiring simple, robust, fixed-output DC/DC conversion without external compensation.
FAQ
What is the minimum input voltage required for AP1501-50K5G-U to regulate 5V output?
The AP1501-50K5G-U requires a minimum input voltage of 7V to maintain 5V regulation across its full 0.2–3A load range and −20°C to +85°C ambient temperature. Below 7V, dropout occurs due to internal switch saturation voltage (~1.4V) and feedback reference headroom, causing unregulated output collapse.
Can AP1501-50K5G-U be used without an external catch diode?
No. The AP1501-50K5G-U is a non-synchronous buck converter and requires an external Schottky diode (e.g., B340A or PDS340 series) connected from Output to GND. Omitting this diode prevents inductor current freewheeling, causing catastrophic switch failure and loss of regulation.
How does the ON/OFF (SD) pin behave when left unconnected?
When the SD pin is left floating or tied to GND, the AP1501-50K5G-U remains enabled and operational. The device interprets SD < 1.3V as "ON"; only voltages >2.0V (up to 40V) force shutdown. No pull-up or pull-down resistor is required for default operation.
Is AP1501-50K5G-U pin-compatible with other AP1501 variants in TO263-5?
Yes-all AP1501 variants (3.3V, 5V, 12V, adjustable) in TO263-5 package share identical pinout, footprint, and thermal pad layout. Only the internal feedback network differs; no PCB redesign is needed when swapping between fixed-output versions.
AP1501-50K5G-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1501-50K5G-U FAQ
1.How can I place an order for AP1501-50K5G-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1501-50K5G-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 AP1501-50K5G-U reliable?
The price and inventory of AP1501-50K5G-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1501-50K5G-U is usually 5 days.
3.What payment methods are accepted for AP1501-50K5G-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1501-50K5G-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1501-50K5G-U?
AP1501-50K5G-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1501-50K5G-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 AP1501-50K5G-U?
For technical support, including AP1501-50K5G-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1501-50K5G-U requirements.
6.How does Aetrix verify that AP1501-50K5G-U is sourced from the original manufacturer or authorized distributors?
All AP1501-50K5G-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 AP1501-50K5G-U meets industry standards.
7.What is the process for return or replacement of AP1501-50K5G-U?
All AP1501-50K5G-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1501-50K5G-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 AP1501-50K5G-U part is unused and in its original packaging.
Return procedure for AP1501-50K5G-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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