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Diodes Incorporated AP1501A-50K5G-U
- Part No.:
- AP1501A-50K5G-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1501A-50K5G-U.pdf
- Description:
- IC REG BUCK 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,931
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Product details
Overview
AP1501A-50K5G-U from Diodes Incorporated is a monolithic 150kHz, 5A non-synchronous PWM buck DC/DC converter with fixed 5V output, integrated power switch, thermal shutdown, and current-limit protection. It operates from 4.5V to 40V input, delivers ±4% output voltage accuracy at 5V under full load, and uses TO263-5 surface-mount packaging for high-power density in industrial and embedded power supplies.
For engineers reviewing the AP1501A-50K5G-U datasheet, AP1501A-50K5G-U pinout, AP1501A-50K5G-U application, or AP1501A-50K5G-U equivalent, key selection criteria include its 5A continuous output capability, internal switch saturation voltage (1.5–1.7V), ON/OFF logic-controlled shutdown, built-in compensation, and thermal resistance (θJA = 37°C/W) in TO263-5 package.
Technical Context
The AP1501A-50K5G-U implements voltage-mode PWM control with a fixed 150kHz ±15% oscillator, enabling compact external LC filter design. Its feedback loop references a 1.23V internal bandgap and requires no external compensation components due to on-chip frequency compensation.
It integrates a 5A N-channel MOSFET switch with 1.5–1.7V saturation voltage at full load, supports logic-level shutdown via the SD pin (1.3V threshold), and includes cycle-by-cycle current limiting (5.5–6.5A peak) and thermal shutdown activation above +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% across 0.2–5A load and 8–40V input - ensures stable rail for microcontrollers and logic without external resistor network. |
| Switching Frequency | 150kHz ±15% - enables use of smaller, lower-cost inductors (e.g., 22µH) and reduces EMI compared to sub-100kHz regulators. |
| Max Output Current | 5A continuous - supports high-current loads like FPGA I/O banks or motor drivers without external pass devices. |
| Input Voltage Range | 4.5V to 40V - accommodates wide-input industrial supplies, automotive battery transients, and 24V/36V systems. |
| Quiescent Current | 5–10mA operating / 150–250µA standby - minimizes no-load power loss in always-on applications. |
| Thermal Resistance | θJA = 37°C/W (TO263-5, 3in² copper) - defines PCB copper area requirement for safe operation at 5A under +85°C ambient. |
| Protection Features | Thermal shutdown (>125°C), cycle-by-cycle current limit (6.0A typ), and undervoltage lockout - prevents damage during overload, short-circuit, or startup faults. |
Pinout & Package
AP1501A-50K5G-U is housed in a thermally enhanced TO263-5 (D²PAK) surface-mount package with exposed metal tab soldered to PCB ground plane for heat dissipation. The metal tab is electrically connected to Pin 3 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input supply | Accepts 4.5–40V DC; requires low-ESR input capacitor to handle 5A switching ripple and minimize voltage sag. |
| 2 Output | Switch node | Drives external Schottky catch diode and inductor; swings between VIN–VSAT (~1.6V drop) and ~–0.5V during freewheeling. |
| 3 GND | Ground reference | Common return for power, feedback, and shutdown; metal tab is internally tied to this pin for thermal conduction. |
| 4 FB | Feedback input | Monitors output via resistive divider (not used in fixed 5V version); open for 5V operation per datasheet configuration. |
| 5 SD | Shutdown control | Logic-compatible input: <1.3V = ON, >2.0V = OFF; sinks ≤25µA when pulled high to disable regulator and reduce IQ to 250µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A Power Switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and layout complexity in space-constrained designs. |
| Internal Compensation | Enables stable regulation with only input/output capacitors and inductor - no external compensation network required for standard configurations. |
| Logic-Level Shutdown | SD pin accepts 0–40V logic signals, allowing direct interface with MCU GPIO or system power sequencers without level-shifting circuitry. |
| Fixed 5V Output Accuracy | ±4% tolerance over full temperature and load range ensures reliable operation of 5V-tolerant peripherals without post-regulation trimming. |
| RoHS/Green Compliant | Fully lead-free, halogen- and antimony-free construction meets EU Directive 2011/65/EU and environmental compliance requirements for industrial equipment. |
Applications
| Industrial PLC I/O Power | Embedded System Core Rail |
|---|---|
Use Scenario: Providing regulated 5V power to digital I/O modules in programmable logic controllers operating from 24V DC field buses. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24V bus to clean 5V for optocoupler drivers, level translators, and sensor interfaces. Use Value: Delivers 5A continuous current with thermal shutdown protection, ensuring reliability during sustained I/O activation and transient overloads. | Use Scenario: Generating main 5V supply for ARM Cortex-M7 microcontrollers and peripheral ICs on compact edge-node PCBs. IC Role / Device Role / Timing Role: High-efficiency buck converter powering CPU core, USB PHY, and Ethernet MAC with minimal external components. Use Value: Achieves 78% efficiency at 12V input/5A load, reducing thermal load and enabling fanless operation in sealed enclosures. |
| Automotive Body Control Module | Test Equipment Power Supply |
Use Scenario: Regulating 5V rail for microcontroller, CAN transceiver, and LED drivers in 12V vehicle body electronics. IC Role / Device Role / Timing Role: Input-transient-tolerant buck regulator handling cold-crank (4.5V) and load-dump (40V) conditions per ISO 7637-2. Use Value: Wide 4.5–40V input range and built-in current/thermal protection eliminate need for pre-regulator stages in automotive-grade designs. | Use Scenario: Serving as adjustable bench supply channel in portable test instrumentation requiring stable 5V/5A output. IC Role / Device Role / Timing Role: Fixed-output DC/DC stage delivering precise 5V to DUTs, with shutdown control enabling remote power cycling via host MCU. Use Value: Logic-compatible SD pin allows synchronized power sequencing with measurement firmware, improving repeatability and safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-5.0/NOPB | 3A rated, 150kHz, TO263-5, ±2% output tolerance, no integrated thermal shutdown | Limited to 3A loads; requires external thermal pad management and external current limiting | Select if lower cost and tighter 5V tolerance are prioritized over 5A capability and integrated protection. |
| MP1584EN-LF-Z | 3A rated, 1.5MHz, SOIC-8, ±1.5% output tolerance, integrated soft-start and light-load efficiency mode | Higher frequency enables smaller magnetics but lower max current; unsuitable for 5A continuous loads | Prefer for compact, low-profile layouts where 3A suffices and higher switching frequency reduces inductor size. |
Compared with LM2596S-5.0/NOPB and MP1584EN-LF-Z, AP1501A-50K5G-U uniquely delivers 5A output with integrated thermal/current protection in TO263-5, making it optimal for high-current industrial rails where reliability under sustained load is critical.
Availability
AP1501A-50K5G-U is available at Aetrix Electronics and suitable for industrial PLC I/O power, embedded system core rails, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for AP1501A-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 and automotive markets.
The AP1501A series belongs to Diodes' high-current monolithic buck regulator product line, designed specifically for cost-sensitive, high-power-density DC/DC conversion in industrial automation and embedded systems where external component count must be minimized.
FAQ
What is the maximum recommended PCB copper area for thermal performance of AP1501A-50K5G-U?
The datasheet specifies a minimum 0.8 inch² copper area for the TO263-5 thermal pad, with ideal performance achieved using ≥2 inch² of 2 oz copper. Larger areas beyond ~6 inch² yield diminishing returns. Copper must be solidly soldered to the exposed tab (Pin 3/GND) and avoid excessive thermal relief on vias to maintain low θJA.
Can AP1501A-50K5G-U operate with an input voltage below 4.5V?
No - the absolute minimum operating input voltage is 4.5V per the Recommended Operating Conditions table. Below this, the internal bias circuitry cannot sustain regulation, and output voltage collapses. For sub-4.5V inputs, consider a different regulator architecture such as a low-dropout buck-boost or specialized ultra-low-VIN controller.
Is an external Schottky diode mandatory for AP1501A-50K5G-U operation?
Yes - the AP1501A-50K5G-U is a non-synchronous buck converter and requires an external Schottky catch diode (e.g., SB560, SS34) connected between Output and GND. This diode provides the freewheeling path during the switch-off phase; omitting it causes catastrophic failure due to inductive kickback and reverse voltage stress.
Does AP1501A-50K5G-U require an external feedback resistor network for 5V output?
No - the "-50" suffix denotes the fixed 5V output version. The FB pin is internally connected to the 1.23V reference and should be left unconnected (open) per the datasheet. External resistors are only required for the adjustable version (AP1501A-K5G-U) to set VOUT = 1.23V × (1 + R2/R1).
AP1501A-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
AP1501A-50K5G-U FAQ
1.How can I place an order for AP1501A-50K5G-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1501A-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 AP1501A-50K5G-U reliable?
The price and inventory of AP1501A-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 AP1501A-50K5G-U is usually 5 days.
3.What payment methods are accepted for AP1501A-50K5G-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1501A-50K5G-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1501A-50K5G-U?
AP1501A-50K5G-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1501A-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 AP1501A-50K5G-U?
For technical support, including AP1501A-50K5G-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1501A-50K5G-U requirements.
6.How does Aetrix verify that AP1501A-50K5G-U is sourced from the original manufacturer or authorized distributors?
All AP1501A-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 AP1501A-50K5G-U meets industry standards.
7.What is the process for return or replacement of AP1501A-50K5G-U?
All AP1501A-50K5G-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1501A-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 AP1501A-50K5G-U part is unused and in its original packaging.
Return procedure for AP1501A-50K5G-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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