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Diodes Incorporated AP1512A-12K5L-U
- Part No.:
- AP1512A-12K5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1512A-12K5L-U.pdf
- Description:
- IC REG BUCK 12V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,182
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Product details
Overview
AP1512A-12K5L-U from Diodes Incorporated is a monolithic 50 kHz non-synchronous PWM buck DC/DC converter with integrated 3 A switch, fixed 12 V output, TO263-5L package, and thermal/current protection. It operates from 4.5–60 V input, delivers ±4% output voltage accuracy at full load, and supports logic-level ON/OFF shutdown for low-power standby mode in industrial power rails.
For engineers reviewing the AP1512A-12K5L-U datasheet, AP1512A-12K5L-U pinout, AP1512A-12K5L-U application, or AP1512A-12K5L-U equivalent, key selection criteria include its 3 A continuous output capability, 50 kHz fixed-frequency operation enabling compact magnetics, internal compensation eliminating external loop components, and thermal shutdown with junction-to-case resistance of 3.5 °C/W.
Technical Context
The AP1512A-12K5L-U implements voltage-mode PWM control with a built-in 1.235 V reference and error amplifier, using feedback from the FB pin to regulate output via duty-cycle adjustment. Its oscillator runs at 50 kHz ±15%, and the internal power switch features 1.3–1.5 V saturation voltage at 3 A peak current.
Thermal shutdown activates above +125 °C junction temperature, and cycle-by-cycle current limiting triggers at 3.2–6 A (typ. 4 A) to protect against overloads. The SD pin accepts logic-level signals (VIL ≤ 0.6 V, VIH ≥ 2.0 V) to disable switching and reduce quiescent current to 350 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% across 0.2–3 A load and 15–60 V input - ensures stable rail for industrial sensors and actuators without external resistor divider. |
| Switching Frequency | 50 kHz ±15% - enables use of smaller, lower-cost inductors (e.g., 33–47 µH) and reduces EMI filtering complexity versus 25–100 kHz alternatives. |
| Continuous Output Current | 3 A - supports higher-power loads than 2 A variants (e.g., AP1512), reducing need for parallel regulators in 12 V distributed power systems. |
| Input Voltage Range | 4.5 V to 60 V - accommodates wide-input applications including automotive battery (12 V/24 V), telecom (-48 V derived), and industrial 24–48 V buses. |
| Thermal Resistance θJC | 3.5 °C/W - requires ≥0.4 in² copper pad under metal tab for safe operation at full load; junction temp rise ~10.5 °C/W at 3 A with typical PCB layout. |
| Shutdown Quiescent Current | 350 µA at VIN = 60 V - enables ultra-low-power sleep modes in battery-backed or energy-harvesting systems without auxiliary LDOs. |
| Feedback Reference Voltage | 1.235 V - sets regulation point for adjustable versions; unused in fixed-12 V variant but retained for internal error amplifier biasing. |
Pinout & Package
AP1512A-12K5L-U uses the TO263-5L surface-mount package with exposed metal tab (GND-connected) for thermal dissipation. The 5-pin layout places GND on both Pin 3 and the tab, minimizing ground impedance and improving thermal transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Positive input supply | Accepts 4.5–60 V; requires local 1 µF ceramic bypass capacitor to suppress switching transients and supply peak gate drive current. |
| OUTPUT (Pin 2) | Internal power switch drain | Swings between VIN − VSAT (~1.5 V drop) and −0.5 V; connects to inductor input - minimize copper area here to reduce EMI coupling. |
| GND (Pin 3) | Power and signal ground reference | Low-impedance return path for switch current and IC bias; must be tied directly to large copper pour under metal tab for thermal performance. |
| FB (Pin 4) | Output voltage feedback input | Internally compared to 1.235 V reference; open-circuited in fixed-12 V version - no external resistors required. |
| SD (Pin 5) | Logic-level shutdown control | Pull ≤0.6 V to enable regulator; pull ≥2.0 V to disable (quiescent current drops to 350 µA); floating or grounded = always ON. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3 A power switch | Eliminates external MOSFET and driver, reducing BOM count and board space - ideal for cost-sensitive industrial modules with 12 V/3 A requirements. |
| Internal compensation network | Enables stable regulation with only input/output capacitors and inductor - no external compensation components needed for standard buck configurations. |
| Thermal shutdown + current limit | Protects against sustained overload or poor heatsinking: trips at TJ > +125 °C and limits peak switch current to 4 A (typ.), preventing device destruction. |
| Logic-compatible ON/OFF control | SD pin accepts standard CMOS/TTL levels (0–5 V), allowing direct interface with microcontrollers or system power sequencers without level-shifting circuitry. |
| Lead-free, RoHS-compliant packaging | TO263-5L package with matte tin finish meets EU Directive 2002/95/EC - suitable for lead-free reflow assembly and environmentally regulated end equipment. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Providing isolated 12 V power to analog sensor inputs and digital outputs in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V bus to clean, regulated 12 V for signal conditioning circuitry and optocoupler drivers. Use Value: 3 A output headroom supports up to eight 12 V solenoid drivers simultaneously; thermal shutdown prevents latch-up during short-circuit faults on field wiring. |
Use Scenario: Generating 12 V rail for interior lighting controllers, window lift ECUs, and door module logic from vehicle battery (12 V nominal, 6–16 V transient range). IC Role / Device Role / Timing Role: Non-isolated buck converter supplying regulated 12 V to MCU, CAN transceivers, and LED drivers in body electronics nodes. Use Value: 4.5–60 V input range handles cold-crank (6 V) and load-dump (60 V) events; 50 kHz frequency avoids AM radio band interference. |
| Telecom Remote Radio Unit | Factory Automation HMI Panel |
|
Use Scenario: Converting -48 V telecom supply to +12 V for RF front-end biasing, FPGA configuration, and fan control in remote radio heads. IC Role / Device Role / Timing Role: High-input-voltage buck stage stepping down -48 V-derived positive rail (e.g., +54 V) to 12 V for analog subsystems. Use Value: 60 V absolute max input rating allows safe operation with 10% tolerance on rectified -48 V supplies; TO263 thermal pad enables conduction cooling in sealed enclosures. |
Use Scenario: Powering touch-screen controllers, backlight inverters, and Ethernet PHYs in ruggedized human-machine interface panels deployed on shop floors. IC Role / Device Role / Timing Role: Main 12 V DC/DC converter feeding downstream LDOs and isolated DC/DCs for noise-sensitive display and communication circuits. Use Value: Internal compensation simplifies layout in vibration-prone environments; 3.5 °C/W θJC supports reliable operation at 85 °C ambient with minimal heatsinking. |
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-12/NOPB | 3 A, 150 kHz switching, external compensation required, wider input (4.5–40 V), no integrated thermal shutdown. | Suitable for cost-sensitive consumer designs where layout space permits external compensation and thermal monitoring. | Select if higher frequency (smaller inductors) and TI ecosystem support are prioritized over integrated protection and simplified design. |
| MP1584EN-LF-Z | 3 A, 1.5 MHz switching, adjustable-only output, requires external feedback resistors, lower input max (28 V). | Better suited for compact portable devices needing high-frequency operation and tight board space constraints. | Choose when 1.5 MHz operation is mandatory and 12 V is generated via external resistor divider - not a drop-in replacement due to pinout and input voltage mismatch. |
Compared with LM2596S-12/NOPB and MP1584EN-LF-Z, AP1512A-12K5L-U offers integrated thermal/current protection and fixed 12 V output without external resistors - reducing design risk and component count in industrial 24–60 V input systems where reliability outweighs ultra-high switching frequency.
Availability
AP1512A-12K5L-U is available at Aetrix Electronics and suitable for industrial automation power supplies, automotive body electronics, telecom infrastructure, and factory HMI systems requiring stable component supply and long-term manufacturability.
Supply support for AP1512A-12K5L-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, automotive, and computing markets.
The AP1512/A series targets cost-effective, thermally robust DC/DC conversion in harsh-environment applications - designed to replace linear regulators and discrete buck controllers in 2–3 A, wide-input-voltage industrial power rails.
FAQ
What is the maximum input voltage the AP1512A-12K5L-U can safely handle?
The AP1512A-12K5L-U has an absolute maximum input voltage rating of +63 V, with recommended operating range of +4.5 V to +60 V. Sustained operation above 60 V risks exceeding internal transistor breakdown limits, while operation below 4.5 V prevents proper startup and regulation. Transient spikes beyond 63 V require external clamping.
Does the AP1512A-12K5L-U require external compensation components?
No - the AP1512A-12K5L-U integrates full frequency compensation, eliminating the need for external RC networks on the FB pin. This simplifies layout and improves stability across line/load variations without tuning. Only input/output capacitors and the power inductor are required for basic operation.
How does the thermal shutdown function operate, and what is its trip threshold?
Thermal shutdown activates when the internal junction temperature exceeds +125 °C, disabling the power switch until temperature falls below ~110 °C (typical hysteresis). The trip point is fixed and unadjustable; it protects against sustained overload, poor PCB copper, or high ambient conditions without external sensing components.
Can the AP1512A-12K5L-U be used in adjustable-output configurations?
No - the AP1512A-12K5L-U is a fixed 12 V output variant. Its FB pin is internally connected to the 12 V output node; external resistor dividers are not supported. For adjustable operation, select AP1512A-ADJK5L-U (with "ADJ" suffix) and use the specified feedback network per the datasheet.
AP1512A-12K5L-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):
- 12V
- 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-12K5L-U FAQ
1.How can I place an order for AP1512A-12K5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1512A-12K5L-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-12K5L-U reliable?
The price and inventory of AP1512A-12K5L-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-12K5L-U is usually 5 days.
3.What payment methods are accepted for AP1512A-12K5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1512A-12K5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1512A-12K5L-U?
AP1512A-12K5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1512A-12K5L-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-12K5L-U?
For technical support, including AP1512A-12K5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1512A-12K5L-U requirements.
6.How does Aetrix verify that AP1512A-12K5L-U is sourced from the original manufacturer or authorized distributors?
All AP1512A-12K5L-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-12K5L-U meets industry standards.
7.What is the process for return or replacement of AP1512A-12K5L-U?
All AP1512A-12K5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1512A-12K5L-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-12K5L-U part is unused and in its original packaging.
Return procedure for AP1512A-12K5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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