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Diodes Incorporated AP1512A-50K5L-U
- Part No.:
- AP1512A-50K5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1512A-50K5L-U.pdf
- Description:
- IC REG BUCK 5V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,049
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Product details
Overview
AP1512A-50K5L-U from Diodes Incorporated is a monolithic 50 kHz fixed-frequency voltage-mode PWM buck DC/DC converter with integrated 3 A switch, TO263-5L package, ±4% output voltage tolerance, and logic-controlled shutdown. It delivers regulated 5 V output (fixed version), supports input voltages up to 60 V, and operates across –40 °C to +125 °C junction temperature.
For engineers reviewing the AP1512A-50K5L-U datasheet, AP1512A-50K5L-U pinout, AP1512A-50K5L-U application, or AP1512A-50K5L-U equivalent, key selection criteria include its 3 A continuous output capability, internal current limit (3.2–6 A), thermal shutdown, 50 kHz switching frequency for compact magnetics, and compatibility with standard TO263 PCB layout guidelines.
Technical Context
The AP1512A-50K5L-U implements non-synchronous voltage-mode PWM control with an internal 1.235 V reference and error amplifier. Its oscillator is trimmed to 50 kHz ±15%, enabling predictable filter design using standard inductors and capacitors.
Feedback is taken via the FB pin referenced to the internal 1.235 V bandgap; for the 5 V fixed version, no external resistor divider is required. Shutdown is asserted by driving the SD pin above 2.0 V, reducing quiescent current to 350 µA at 60 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports higher-power industrial loads without external MOSFETs |
| Switching Frequency | 50 kHz ±15% - enables use of low-cost, high-inductance chokes (e.g., 33–47 µH) and reduces EMI filtering burden |
| Input Voltage Range | 4.5 V to 60 V - suitable for 12 V, 24 V, and 48 V industrial bus rails with transient margin |
| Output Voltage Accuracy | ±4% at 5 V - ensures stable microcontroller or FPGA core supply under line/load variation |
| Current Limit Threshold | 3.2–6 A peak - provides robust short-circuit protection while allowing inrush during startup |
| Thermal Shutdown | Active above +125 °C junction - prevents latch-up or permanent damage during overload or poor heatsinking |
| Quiescent Current | 5–10 mA active / 350 µA standby - enables low-power hold modes in battery-backed systems |
Pinout & Package
AP1512A-50K5L-U is housed in a surface-mount TO263-5L package with exposed metal tab (GND-connected) for thermal conduction. Minimum recommended copper area is 0.4 in²; optimal performance requires ≥2 in² of 2 oz copper on the PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 4.5–60 V; requires local 1 µF ceramic bypass capacitor to suppress switching transients |
| OUTPUT (Pin 2) | Internal power switch drain | Drives external catch diode and inductor; trace must be short and wide to minimize ringing and EMI |
| GND (Pin 3) | Signal and power ground | Reference for FB, SD, and internal regulators; tied to exposed tab for thermal path |
| FB (Pin 4) | Feedback input | Compares output voltage against 1.235 V reference; open for fixed 5 V version (AP1512A-50K5L-U) |
| SD (Pin 5) | Shutdown control | Logic-compatible input: <1.3 V = ON, >2.0 V = OFF; pulls to GND if unused |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3 A power switch | Eliminates need for external high-side MOSFET and gate driver, reducing BOM count and board area |
| Fixed 5 V output configuration | Removes feedback resistor network, simplifying layout and improving accuracy over adjustable versions |
| Thermal shutdown + current limit | Provides dual-layer protection against sustained overload or ambient temperature rise beyond rating |
| Logic-level ON/OFF control | Enables direct interface with MCU GPIOs without level-shifting, supporting system-level power sequencing |
| Lead-free, RoHS-compliant TO263-5L | Meets environmental compliance requirements and supports standard reflow soldering profiles |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Regulating 24 V vehicle battery to 5 V for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing clean, stable 5 V rail with thermal resilience under engine-bay temperature swings. Use Value: Delivers 3 A continuously at 80% efficiency (VIN=30 V, IOUT=3 A), meeting ASIL-B functional safety margins without derating. |
Use Scenario: On-board step-down conversion for body electronics such as door modules, lighting controllers, and HVAC actuators. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter operating from 9–16 V nominal battery with cold-crank tolerance down to 4.5 V. Use Value: Maintains regulation during load-dump transients up to 60 V, supported by internal 63 V absolute max VIN rating. |
| Programmable Logic Controller (PLC) I/O Module | Point-of-Load Converter for Industrial Sensors |
|
Use Scenario: Generating isolated 5 V supply for digital I/O circuitry in DIN-rail mounted PLC backplanes. IC Role / Device Role / Timing Role: High-input-voltage buck stage preceding isolated DC/DC or LDO, handling 48 V field bus inputs. Use Value: Enables compact, fanless design with 23 °C/W θJA (3 in² copper), supporting continuous operation at 85 °C ambient. |
Use Scenario: Local 5 V rail for analog signal conditioning, ADC reference, and RS-485 transceivers in distributed sensor nodes. IC Role / Device Role / Timing Role: Efficient point-of-load regulator minimizing heat generation near thermally sensitive components. Use Value: Achieves <10 mA quiescent current in active mode and 350 µA in shutdown-critical for low-duty-cycle wireless sensor operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z (Monolithic Power) | 40 V max input, 3 A, 1.5 MHz switching - smaller passive components but higher EMI risk | Requires careful layout for noise-sensitive analog circuits; lacks 60 V input headroom | Prefer MP1584 when board space is constrained and input stays ≤40 V |
| LM2596S-5.0 (Texas Instruments) | 40 V max input, 3 A, 150 kHz - lower frequency allows larger, cheaper inductors but needs bigger output caps | Higher dropout at light load; no logic-level shutdown (requires external transistor) | Choose LM2596S where cost sensitivity outweighs footprint and feature trade-offs |
Compared with MP1584EN-LF-Z and LM2596S-5.0, AP1512A-50K5L-U uniquely combines 60 V input capability, integrated shutdown logic, and TO263 thermal performance-making it optimal for ruggedized 24/48 V industrial and automotive applications where reliability trumps ultra-high switching frequency.
Availability
AP1512A-50K5L-U is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP1512A-50K5L-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.
AP1512A belongs to Diodes' legacy high-voltage buck regulator product line, engineered for robustness in harsh environments-emphasizing wide input range, integrated protection, and thermal resilience over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for AP1512A-50K5L-U?
The absolute maximum input voltage is +63 V, with recommended operation from +4.5 V to +60 V. This 60 V upper limit supports 48 V industrial buses and automotive load-dump conditions, and the device maintains regulation down to 4.5 V-covering cold-crank scenarios in 12 V systems.
Does AP1512A-50K5L-U require external compensation components?
No. The AP1512A-50K5L-U features internal frequency compensation, eliminating the need for external RC networks on the FB pin. This simplifies design, improves stability across line/load variations, and reduces bill-of-materials count compared to controllers requiring external loop compensation.
How does the shutdown (SD) pin function in AP1512A-50K5L-U?
The SD pin accepts logic-level signals: below 0.6 V keeps the regulator enabled; above 2.0 V disables switching and reduces quiescent current to 350 µA. It is compatible with 3.3 V and 5 V MCUs without level shifting, and may be tied directly to GND if shutdown is not required.
Can AP1512A-50K5L-U drive a 3 A load continuously at 85 °C ambient?
Yes-when mounted on ≥2 in² of 2 oz copper, the TO263-5L package achieves θJA ≈ 23 °C/W. At 3 A and 30 V input, power dissipation is ~3.6 W; junction temperature rise is ~83 °C, resulting in TJ ≈ 168 °C-above rating. Derating to 2.5 A or adding airflow is advised for sustained 85 °C ambient operation.
AP1512A-50K5L-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:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1512A-50K5L-U FAQ
1.How can I place an order for AP1512A-50K5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1512A-50K5L-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 AP1512A-50K5L-U reliable?
The price and inventory of AP1512A-50K5L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1512A-50K5L-U is usually 5 days.
3.What payment methods are accepted for AP1512A-50K5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1512A-50K5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1512A-50K5L-U?
AP1512A-50K5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1512A-50K5L-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 AP1512A-50K5L-U?
For technical support, including AP1512A-50K5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1512A-50K5L-U requirements.
6.How does Aetrix verify that AP1512A-50K5L-U is sourced from the original manufacturer or authorized distributors?
All AP1512A-50K5L-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 AP1512A-50K5L-U meets industry standards.
7.What is the process for return or replacement of AP1512A-50K5L-U?
All AP1512A-50K5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1512A-50K5L-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 AP1512A-50K5L-U part is unused and in its original packaging.
Return procedure for AP1512A-50K5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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