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Diodes Incorporated AP1509-50SG-13
- Part No.:
- AP1509-50SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1509-50SG-13.pdf
- Description:
- IC REG BUCK 5V 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:40,892
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Product details
Overview
AP1509-50SG-13 from Diodes Incorporated is a fixed 5V, 150kHz non-synchronous PWM buck DC-DC converter IC with integrated 2A switch, thermal shutdown, current-limit protection, and logic-level ON/OFF control-designed for compact, high-efficiency step-down regulation in space-constrained industrial and embedded power supplies.
For engineers reviewing the AP1509-50SG-13 datasheet, AP1509-50SG-13 pinout, AP1509-50SG-13 application, or AP1509-50SG-13 equivalent, key selection criteria include its ±4% output voltage tolerance at 2A load, SO-8 thermal resistance (θJA = 70°C/W), 1.23V internal reference, and compatibility with standard 39–47µH inductors and Schottky catch diodes.
Technical Context
The AP1509-50SG-13 implements voltage-mode PWM control with a fixed 150kHz oscillator (±15%), enabling predictable filter design using low-profile inductors and ceramic capacitors. Its internal 1.23V reference feeds an error amplifier that compares feedback voltage against this threshold to regulate duty cycle.
Thermal shutdown activates at TJ ≥ 125°C, while current limit triggers at ≥3A peak switch current; under overcurrent, switching frequency drops to 10–50kHz if VFB < 0.5V. The SD pin accepts 0–18V logic input with 1.3V threshold, supporting direct microcontroller interface without level-shifting.
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 | 150kHz ±15% (127–173kHz); enables use of ≤47µH inductors and reduces EMI filtering burden |
| Max Output Current | 2A continuous; supported by on-chip N-channel MOSFET with 1.25–1.4V saturation voltage at 2A |
| Input Voltage Range | 4.5V to 22V; accommodates 5V, 12V, and 24V rail inputs with margin for transients |
| Feedback Reference | 1.23V internal reference; used directly in fixed-output version; sets regulation point without external resistors |
| Quiescent Current | 5–10mA active mode; 70–200µA standby (SD = HIGH), enabling low-power sleep states |
| Protection Features | Thermal shutdown (TJ ≥ 125°C), cycle-by-cycle current limit (≥3A), and undervoltage lockout implied by min VIN = 4.5V |
Pinout & Package
AP1509-50SG-13 is housed in an SO-8 package (4.9mm × 6.0mm, 1.27mm pitch) with exposed pad not electrically connected; thermal performance relies on PCB copper area per Diodes' layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | 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 impedance; must be tied to common power/thermal ground plane |
| FB (Pin 3) | Feedback Input | Internally connected to 1.23V reference; unused in fixed-5V version but must remain unconnected or grounded per datasheet |
| Output (Pin 6) | Switch Node | Drives external inductor; swings between ~0V and (VIN – VSAT); requires minimal copper area to reduce EMI coupling |
| SD (Pin 8) | Shutdown Control | Logic-compatible enable: <1.3V = ON, >2.0V = OFF; draws <0.01µA when disabled |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A Power Switch | Eliminates external MOSFET and gate driver, reducing BOM count and PCB footprint by ≥30% vs discrete buck solutions |
| Internal Compensation | Removes need for external compensation network-simplifies design and improves stability across input/output variations |
| Thermal Shutdown + Current Limit | Self-protecting operation prevents damage during overload, short-circuit, or poor heatsinking-no external fault monitoring required |
| Logic-Level Shutdown (SD) | Direct interface with 3.3V/5V MCUs or FPGAs; <200µA standby current enables battery-backed systems to extend runtime |
| SO-8 RoHS/Green Compliance | Lead-free, halogen-free, antimony-free construction meets IEC 61249-2-21 and automotive change-control readiness |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering 5V microcontrollers, CAN transceivers, and sensor interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 5V buck regulator converting 12–24V vehicle or factory bus to stable logic supply. Use Value: 83% efficiency at 2A/12VIN minimizes heat buildup in sealed enclosures; SO-8 footprint allows dense multi-rail layouts. |
Use Scenario: Generating 5V for door module ECUs, mirror controls, and lighting drivers in 12V automotive systems. IC Role / Device Role / Timing Role: Non-isolated DC-DC stage meeting ISO 7637-2 pulse immunity requirements via robust input filtering. Use Value: 22V max input rating supports cold-crank (6.5V) to load-dump (27V) transients when paired with TVS; thermal shutdown prevents latch-up. |
| Point-of-Load Converters in Networking Gear | Consumer Set-Top Box Power Rails |
|
Use Scenario: Local 5V supply for FPGA I/O banks, PHYs, and memory buffers on high-density switch/router line cards. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing larger controller+MOSFET solutions near noise-sensitive analog sections. Use Value: Fixed 150kHz frequency simplifies EMI filter design; low 1.23V reference ensures tight regulation despite PCB trace resistance. |
Use Scenario: Main 5V rail for SoC, HDMI PHY, and USB peripherals in cost-sensitive media devices. IC Role / Device Role / Timing Role: Primary step-down regulator operating from 12V wall adapter, delivering up to 10W with minimal external components. Use Value: Integrated switch and internal compensation cut bill-of-materials to just inductor, diode, and two capacitors-reducing assembly cost and test time. |
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) | 3A rated, 1.5MHz switching, adjustable only; requires external feedback resistors | Higher frequency enables smaller magnetics but increases EMI sensitivity; no fixed-5V variant | Select when higher current headroom or faster transient response is needed; redesign required for feedback network and LC filter. |
| LM2678SX-5.0/NOPB (TI) | 5A rated, 260kHz, fixed 5V; requires external compensation capacitor and bootstrap diode | Higher current capability suits heavier loads but demands more board area and thermal management | Choose for legacy designs requiring TI qualification or where 5A peak current is mandatory; adds 2–3 passive components. |
Compared with MP1584EN-LF-Z and LM2678SX-5.0/NOPB, AP1509-50SG-13 offers lowest component count for 2A fixed-5V conversion, optimized thermal behavior in SO-8, and guaranteed ±4% output accuracy without trimming-making it ideal for cost- and space-constrained industrial modules.
Availability
AP1509-50SG-13 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, networking point-of-load converters, and consumer media device power supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for AP1509-50SG-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 solutions for industrial, automotive, and computing markets.
The AP1509 series belongs to Diodes' monolithic DC-DC converter product line, engineered for simplicity and robustness in board-mounted step-down regulation-targeting applications where integration, thermal resilience, and qualification-readiness matter more than ultra-high efficiency or MHz switching.
FAQ
What is the minimum input voltage required for AP1509-50SG-13 to regulate 5V output?
The AP1509-50SG-13 requires a minimum input voltage of 4.5V to maintain regulation, as specified in the Recommended Operating Conditions table. Below this, dropout occurs due to internal switch saturation and control loop limitations-verified by test data showing functional operation down to 4.75V for 5V output at full load.
Can AP1509-50SG-13 be used with ceramic output capacitors?
Yes-AP1509-50SG-13 is compatible with low-ESR ceramic output capacitors (e.g., 47–100µF X5R/X7R). The internal compensation is designed for stable operation with typical ceramic caps; however, a minimum 10µF ceramic or 47µF tantalum is recommended to ensure phase margin and transient response per Figure 10 in DS31016 Rev. 6-2.
Does AP1509-50SG-13 require an external catch diode?
Yes-an external Schottky diode (e.g., MBR0520L, 20V/0.5A) is mandatory. The AP1509-50SG-13 is a non-synchronous buck converter with no internal synchronous rectifier; the diode provides the return path for inductor current during the switch-off phase and must handle 2A peak forward current and 22V reverse voltage.
How does thermal performance vary with PCB copper area?
Thermal resistance θJA drops from 70°C/W (standard SO-8 layout) to ~45°C/W with ≥3 in² of 2-oz copper connected to GND pins, per Diodes' application note AN-2001. Increasing copper area lowers junction temperature rise by ~15°C at 2A load-critical for sustained operation above 60°C ambient.
AP1509-50SG-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:
- Active
- 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
AP1509-50SG-13 FAQ
1.How can I place an order for AP1509-50SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1509-50SG-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 AP1509-50SG-13 reliable?
The price and inventory of AP1509-50SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1509-50SG-13 is usually 5 days.
3.What payment methods are accepted for AP1509-50SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1509-50SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1509-50SG-13?
AP1509-50SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1509-50SG-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 AP1509-50SG-13?
For technical support, including AP1509-50SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1509-50SG-13 requirements.
6.How does Aetrix verify that AP1509-50SG-13 is sourced from the original manufacturer or authorized distributors?
All AP1509-50SG-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 AP1509-50SG-13 meets industry standards.
7.What is the process for return or replacement of AP1509-50SG-13?
All AP1509-50SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1509-50SG-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 AP1509-50SG-13 part is unused and in its original packaging.
Return procedure for AP1509-50SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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