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Diodes Incorporated AP1509-50SL-13
- Part No.:
- AP1509-50SL-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1509-50SL-13.pdf
- Description:
- IC REG BUCK 5V 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,478
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Product details
Overview
AP1509-50SL-13 from Diodes Incorporated is a monolithic 150 kHz, 2A non-synchronous PWM buck DC-DC converter with integrated power switch, fixed 5V output, ±4% output voltage tolerance at full load, thermal shutdown and current-limit protection, and logic-level ON/OFF shutdown control - used in compact on-card power supplies for industrial and embedded systems.
For engineers reviewing the AP1509-50SL-13 datasheet, AP1509-50SL-13 pinout, AP1509-50SL-13 application, or AP1509-50SL-13 equivalent, key selection criteria include guaranteed 5V ±4% output accuracy across 0.2–2A load, 150 kHz ±15% switching frequency enabling small external inductors (e.g., 39 µH), SO-8 thermal resistance (θJA = 70°C/W), and standby current of 70–150 µA under VIN = 22V.
Technical Context
The AP1509-50SL-13 implements voltage-mode PWM control with an internal 1.23V reference and error amplifier, operating at a fixed 150 kHz oscillator frequency that reduces filter component size versus lower-frequency regulators. Its non-synchronous architecture uses an internal N-channel MOSFET switch and requires an external Schottky catch diode.
Protection functions include cycle-by-cycle current limiting (trip threshold ≥3A) and thermal shutdown (TJ > 125°C). When current limit activates and VFB falls below 0.5V, switching frequency drops to 10–50 kHz to reduce power dissipation during overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% (4.8–5.25V) across 0.2–2A load and 7–22V input |
| Switching Frequency | 150 kHz ±15% (127–173 kHz); enables use of ≤47 µH inductors in space-constrained designs |
| Max Output Current | 2A continuous; limited by internal switch RDS(on) and thermal design in SO-8 package |
| Feedback Reference | 1.23V ±2.5% internal reference; sets regulation point for fixed-output variants |
| Shutdown Quiescent Current | 70–150 µA at VIN = 22V; supports low-power standby modes in battery-backed systems |
| Thermal Shutdown Threshold | 125°C junction temperature; protects device during sustained overload or poor PCB heatsinking |
| Input Voltage Range | 4.5V to 22V; supports 5V, 12V, and 24V rail inputs without external regulators |
Pinout & Package
The AP1509-50SL-13 is housed in a standard lead-free SO-8 package (4.90 × 6.00 mm, 1.27 mm pitch) with exposed pad not electrically connected. Thermal performance relies on PCB copper area (θJA = 70°C/W typical with 3 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 4.5–22V DC; requires local 10–100 µF low-ESR input capacitor to suppress switching transients |
| GND (Pins 2, 4, 5, 7) | Ground reference | Four dedicated ground pins minimize ground impedance and improve noise immunity and thermal conduction |
| FB (Pin 3) | Feedback sense | Monitors output via resistive divider; internally biased to 1.23V reference for regulation |
| Output (Pin 6) | Internal switch drain | Switches between VIN–VSAT (~21.5V max) and ~–0.5V; connects to inductor and catch diode anode |
| SD (Pin 8) | Shutdown control | Logic-compatible input: <1.3V = ON, >2.0V = OFF; draws <0.1 µA when active, supports direct MCU GPIO drive |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A power switch | Eliminates external MOSFET, reducing BOM count and layout area in 5V step-down applications |
| Fixed 5V output with ±4% tolerance | Meets tight regulation requirements for microcontroller I/O rails and analog subsystems without trimming |
| 150 kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing across production batches |
| Thermal shutdown + current limit | Provides self-protection during short-circuit, overtemperature, or excessive load conditions |
| Logic-level ON/OFF control | Supports direct interface with 3.3V/5V MCUs without level-shifting circuitry |
Applications
| Industrial PLC I/O Modules | Embedded Network Interface Cards |
|---|---|
|
Use Scenario: Powering isolated digital I/O channels in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying FPGA configuration logic, optocoupler drivers, and RS-485 transceivers. Use Value: Delivers stable 5V at up to 2A with <±4% tolerance across –20°C to +85°C ambient, ensuring reliable logic-level compatibility and signal integrity. |
Use Scenario: Local 5V supply for Ethernet PHY, MAC controller, and flash memory on PCIe-based network adapters. IC Role / Device Role / Timing Role: Non-isolated point-of-load converter stepping down 12V backplane voltage to clean 5V domain. Use Value: 150 kHz switching allows compact 39 µH shielded inductor and low-profile ceramic output capacitors, fitting tight card-edge height constraints. |
| Automotive Body Control Modules | Smart Sensor Hub Power Rails |
|
Use Scenario: Regulating 5V for LIN transceivers, EEPROM, and LED drivers in door module ECUs. IC Role / Device Role / Timing Role: Input-supervised buck converter accepting wide 7–18V automotive battery range with built-in overvoltage clamp. Use Value: Standby current of 70–150 µA enables low-quiescent operation during vehicle sleep mode, meeting OEM battery drain limits. |
Use Scenario: Powering multi-sensor fusion nodes (accelerometer, gyroscope, temperature) in IoT edge devices. IC Role / Device Role / Timing Role: Primary 5V source feeding low-noise LDOs and ADC reference circuits. Use Value: Internal compensation eliminates external loop components, simplifying layout while maintaining >75% efficiency at 100 mA–2A loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z (Monolithic Power) | 1.5 MHz switching frequency, adjustable output, higher IQ (2.5 mA), no internal compensation | Requires external compensation network; better suited for ultra-compact designs needing <10 µH inductors | Select when board space is critical and higher-frequency EMI filtering is acceptable |
| LM2678SX-5.0/NOPB (TI) | 63 kHz frequency, 5A rating, external MOSFET required, wider input (8–40V) | Needs discrete high-side switch and gate driver; better for high-current, high-input-voltage industrial supplies | Select when >2A load or >22V input is required and thermal headroom permits larger layout |
Compared with MP1584EN-LF-Z and LM2678SX-5.0/NOPB, the AP1509-50SL-13 offers lowest system complexity for 2A, 5V, 150 kHz applications - integrating switch, compensation, and protection without external components beyond inductor/diode/capacitors.
Availability
AP1509-50SL-13 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded network interface cards, automotive body control units, and smart sensor hub power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AP1509-50SL-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 ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.
The AP1509 series belongs to Diodes' DC-DC converter product line, designed specifically for cost-sensitive, space-constrained step-down applications requiring integrated switch, fixed output, and robust protection - targeting industrial control, embedded systems, and automotive body electronics.
FAQ
What is the minimum input voltage required for stable 5V output at 2A?
The AP1509-50SL-13 requires a minimum input voltage of 7V to maintain regulated 5V output at full 2A load, per its recommended operating condition (7V ≤ VIN ≤ 22V). Below 7V, dropout occurs due to internal switch saturation voltage (~1.4V) and feedback loop limitations, causing output collapse.
Can the AP1509-50SL-13 be used without the external Schottky diode?
No - the AP1509-50SL-13 is a non-synchronous buck converter and requires an external Schottky diode (e.g., SB560, SS34) connected from the Output pin to GND to provide the freewheeling path during switch-off periods. Omitting it causes catastrophic failure due to inductive kickback and lack of current continuity.
How does the current-limit protection behave during sustained overload?
Under sustained overload, the AP1509-50SL-13 enters hiccup mode: when VFB drops below 0.5V during current-limit activation, oscillator frequency reduces to 10–50 kHz, lowering average power dissipation. After thermal recovery, normal 150 kHz operation resumes - preventing latch-up and enabling self-recovery without external reset.
Is the SO-8 package thermally adequate for 2A continuous operation at 22V input?
Yes, but only with proper PCB thermal design: ≥3 in² of 2-oz copper connected to all four GND pins, minimal copper on the Output pin, and airflow >0.5 m/s. At 22V/5V/2A (75% duty cycle), junction temperature rise is ~55°C above ambient with θJA = 70°C/W - keeping TJ < 125°C up to 70°C ambient.
AP1509-50SL-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):
- 5V
- 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
AP1509-50SL-13 FAQ
1.How can I place an order for AP1509-50SL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1509-50SL-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 AP1509-50SL-13 reliable?
The price and inventory of AP1509-50SL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1509-50SL-13 is usually 5 days.
3.What payment methods are accepted for AP1509-50SL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1509-50SL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1509-50SL-13?
AP1509-50SL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1509-50SL-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 AP1509-50SL-13?
For technical support, including AP1509-50SL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1509-50SL-13 requirements.
6.How does Aetrix verify that AP1509-50SL-13 is sourced from the original manufacturer or authorized distributors?
All AP1509-50SL-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 AP1509-50SL-13 meets industry standards.
7.What is the process for return or replacement of AP1509-50SL-13?
All AP1509-50SL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1509-50SL-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 AP1509-50SL-13 part is unused and in its original packaging.
Return procedure for AP1509-50SL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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