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Diodes Incorporated AP1509-12SL-13
- Part No.:
- AP1509-12SL-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1509-12SL-13.pdf
- Description:
- IC REG BUCK 12V 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,630
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Product details
Overview
AP1509-12SL-13 from Diodes Incorporated is a monolithic 150kHz, 2A non-synchronous PWM buck DC-DC converter with fixed 12V output, integrated power switch, internal compensation, and thermal/current protection. It operates from 4.5V to 22V input, delivers ±4% output voltage accuracy at 2A load, and uses an SO-8 package for space-constrained industrial power rails.
For engineers reviewing the AP1509-12SL-13 datasheet, AP1509-12SL-13 pinout, AP1509-12SL-13 application, or AP1509-12SL-13 equivalent, key selection criteria include its fixed 12V output tolerance, 150kHz switching frequency enabling compact LC filtering, ON/OFF logic-controlled shutdown, and built-in current limit with frequency foldback under overload.
Technical Context
The AP1509-12SL-13 implements voltage-mode PWM control with a 1.23V internal reference and feedback amplifier. Its oscillator runs at 150kHz ±15%, and the internal 2A N-channel MOSFET switch features 1.25V typical saturation voltage at full load, enabling high-efficiency step-down conversion without external transistors.
Protection functions include thermal shutdown (TJ > 125°C) and peak current limiting (3A typical), with automatic frequency reduction to ~30kHz when VFB drops below 0.5V during overcurrent events. The SD pin accepts logic-level shutdown (VIL ≤ 0.6V ON, VIH ≥ 2.0V OFF), drawing only 70–150µA in standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% (11.52V–12.48V) under 0.2–2A load and 15–22V input - ensures stable rail for 12V logic or analog subsystems. |
| Switching Frequency | 150kHz ±15% (127–173kHz) - enables use of smaller 39–47µH inductors and low-ESR electrolytic/MLCC output capacitors. |
| Max Output Current | 2A continuous - supports mid-power applications like FPGA I/O banks or motor driver logic supplies without heatsink under moderate ambient. |
| Input Voltage Range | 4.5V to 22V - accommodates wide-input industrial 12V/24V bus systems with transient headroom. |
| Feedback Reference | 1.23V internal reference - sets regulation point for fixed-output variants; used with external resistors in adjustable versions. |
| Shutdown Quiescent Current | 70–150µA at VIN = 22V - minimizes system standby power in battery-backed or energy-sensitive designs. |
| Thermal Protection | Junction shutdown at TJ ≥ 125°C - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
AP1509-12SL-13 is housed in an SO-8 (Small Outline-8) package with exposed pad not electrically connected. Thermal resistance is θJA = 70°C/W (junction-to-ambient) and θJC = 15°C/W (junction-to-case) with standard PCB copper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Positive input supply | Accepts 4.5–22V DC; requires local 10–100µF low-ESR input capacitor to suppress switching transients. |
| GND (Pins 2, 4, 5, 7) | Ground reference | Four dedicated ground pins minimize ground bounce; must be tied to common power ground plane with short traces. |
| FB (Pin 3) | Feedback input | Monitors output via resistor divider; internally biased to 1.23V reference - unused in fixed-12V version but must be left open. |
| Output (Pin 6) | Internal switch drain | Swings between VIN–VSAT (~10.75V at 2A) and –0.5V; connects to inductor input - keep trace short and narrow to reduce EMI. |
| SD (Pin 8) | Shutdown control | Logic-compatible enable: <0.6V = ON, >2.0V = OFF; pull to GND if always active; series resistor recommended for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A power switch | Eliminates external MOSFET and gate driver, reducing BOM count and PCB area by >30% vs discrete buck solutions. |
| Internal compensation network | Enables stable regulation with no external compensation components - simplifies design and improves production yield. |
| Current-limit foldback | Reduces switching frequency to ~30kHz when overload occurs and VFB < 0.5V - limits power dissipation during fault conditions. |
| +4% output voltage tolerance | Guaranteed across temperature (-20°C to +85°C ambient) and load (0.2–2A), meeting tight regulation needs for 12V analog sensors or interface ICs. |
| Lead-free & halogen-free SO-8 | RoHS 3 compliant (≤900ppm Br/Cl, ≤1000ppm Sb); suitable for automotive and industrial applications requiring green material declarations. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Providing regulated 12V rail for digital I/O expansion cards in programmable logic controllers operating in factory environments with 24V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 24V bus to clean 12V for optocoupler drivers and level-shifters. Use Value: Delivers 2A continuously with ±4% output stability across -20°C to +85°C ambient, eliminating need for post-regulation LDOs. |
Use Scenario: Generating 12V supply for microcontroller peripherals and CAN transceivers in body control units powered from vehicle battery (9–16V). IC Role / Device Role / Timing Role: Main 12V DC-DC converter with logic-controlled shutdown for sleep/wake cycles. Use Value: 70–150µA standby current extends battery life during vehicle off-state; thermal shutdown protects against under-hood overheating. |
| Point-of-Load for FPGAs | Smart Sensor Hub Power |
|
Use Scenario: Local 12V supply for FPGA configuration circuitry and auxiliary I/O banks on embedded vision processing boards. IC Role / Device Role / Timing Role: Compact, self-contained buck stage placed near FPGA power pins to minimize IR drop and noise coupling. Use Value: 150kHz switching allows use of small 39µH shielded inductors and ceramic output caps, fitting within tight board real estate. |
Use Scenario: Powering multi-sensor nodes (temperature, humidity, motion) in building automation gateways with 12V wall adapter input. IC Role / Device Role / Timing Role: Efficient step-down regulator feeding isolated DC-DC modules and sensor signal chains. Use Value: 90% efficiency at 2A (VIN=15V) reduces thermal load in sealed enclosures; internal current limit prevents damage during sensor short-circuits. |
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) | 1.5MHz switching frequency, 3A rating, adjustable-only output - requires external resistors for 12V setting. | Better suited for ultra-compact designs needing smaller magnetics; lacks fixed-12V variant and integrated feedback divider. | Select when board space is critical and higher-frequency operation is acceptable; verify loop stability with external compensation. |
| LM2596S-12 (Texas Instruments) | 150kHz frequency, 3A rating, fixed 12V output - larger TO-220-5 package with higher thermal resistance (θJA ≈ 65°C/W). | Requires heatsink above ~1.5A in enclosed environments; less suitable for dense SMT layouts than SO-8. | Prefer when legacy compatibility or higher current margin is needed; accept larger footprint and thermal management overhead. |
Compared with MP1584EN-LF-Z and LM2596S-12, AP1509-12SL-13 offers optimal balance of SO-8 footprint, fixed 12V accuracy, and proven thermal performance up to 2A without external heatsink in standard FR4 layouts.
Availability
AP1509-12SL-13 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, FPGA point-of-load supplies, and smart sensor hubs requiring stable component supply and long-term manufacturability.
Supply support for AP1509-12SL-13 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 devices for industrial, automotive, and computing markets.
The AP1509 series belongs to Diodes' standard DC-DC converter product line, designed specifically for cost-sensitive, medium-current step-down applications where integration, thermal robustness, and RoHS compliance are essential.
FAQ
What is the minimum input voltage required for AP1509-12SL-13 to regulate 12V output?
The AP1509-12SL-13 requires a minimum input voltage of 4.5V to initiate switching, but stable 12V regulation at full 2A load demands VIN ≥ 15V per datasheet specifications. Below 15V, dropout occurs due to internal switch saturation voltage (1.25V typ), causing output collapse under heavy load.
Can the FB pin be left unconnected on the AP1509-12SL-13?
Yes - the AP1509-12SL-13 is a fixed-output variant with internal feedback divider; the FB pin (Pin 3) has no connection to the internal regulation circuit and must remain unconnected (open). Connecting it externally will disrupt regulation or cause malfunction.
Does AP1509-12SL-13 support synchronous rectification?
No - the AP1509-12SL-13 uses a non-synchronous architecture with an internal N-channel MOSFET switch and requires an external Schottky catch diode (e.g., SB560) in the buck topology. It lacks a second switch or gate drive for synchronous rectification.
Is AP1509-12SL-13 qualified for automotive applications per AEC-Q100?
No - the AP1509-12SL-13 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-qualified versions require separate PPAP-capable part numbers (e.g., AP1509-12Qxxx); this part is rated for industrial temperature range (-20°C to +85°C ambient) only.
AP1509-12SL-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 22V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
AP1509-12SL-13 FAQ
1.How can I place an order for AP1509-12SL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1509-12SL-13 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 AP1509-12SL-13 reliable?
The price and inventory of AP1509-12SL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1509-12SL-13 is usually 5 days.
3.What payment methods are accepted for AP1509-12SL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1509-12SL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1509-12SL-13?
AP1509-12SL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1509-12SL-13 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 AP1509-12SL-13?
For technical support, including AP1509-12SL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1509-12SL-13 requirements.
6.How does Aetrix verify that AP1509-12SL-13 is sourced from the original manufacturer or authorized distributors?
All AP1509-12SL-13 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 AP1509-12SL-13 meets industry standards.
7.What is the process for return or replacement of AP1509-12SL-13?
All AP1509-12SL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1509-12SL-13, 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 AP1509-12SL-13 part is unused and in its original packaging.
Return procedure for AP1509-12SL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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