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Diodes Incorporated AP1520SL-13
- Part No.:
- AP1520SL-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1520SL-13.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,396
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Product details
Overview
AP1520SL-13 from Diodes Incorporated is a discontinued 2A synchronous step-down DC/DC converter with integrated P-channel MOSFET, PWM control (0–100% duty), 300kHz fixed-frequency operation, 3.6–23V input range, and adjustable 0.8V–VCC output. It delivers high efficiency (92% @12V→5V/2A), low-ripple power, and built-in protections including overcurrent, short-circuit, thermal shutdown, and enable control - used in PC motherboards, LCD monitors, and microprocessor core supplies.
For engineers reviewing the AP1520SL-13 datasheet, AP1520SL-13 pinout, AP1520SL-13 application, or AP1520SL-13 equivalent, key selection considerations include its SO-8 package with dual output pins, internal compensation, OCSET current-limit programming, FB voltage accuracy (±2%), and reduced 30kHz foldback frequency under fault conditions.
Technical Context
The AP1520SL-13 implements a fixed-frequency PWM-controlled buck topology with an internal P-channel high-side switch and external diode/inductor. Its error amplifier compares FB voltage against a 0.8V reference to regulate output, while the OCSET pin sets current limit via external resistor using a 90µA sink current.
Under overcurrent or short-circuit events, the IC reduces switching frequency from 300kHz to 30kHz for thermal management; under-voltage lockout disables operation below 3.3V VCC, re-enabling above 3.5V. Soft-start time is 0.3–2ms, and thermal shutdown triggers at +150°C with +55°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 23V - supports AC adapter input and wide industrial supply rails |
| Output Voltage Range | 0.8V to VCC - programmable via FB resistor divider for core or I/O rail regulation |
| Switching Frequency | 300kHz typical - enables compact magnetics and predictable EMI profile |
| Max Output Current | 2A continuous - limited by internal MOSFET RDS(ON) (70–150mΩ) and thermal design |
| Feedback Voltage | 0.8V ±2% - determines output accuracy and load/line regulation performance |
| Efficiency | 92% @12V→5V/2A - reflects conduction and switching losses under typical load |
| Thermal Shutdown | +150°C with +55°C hysteresis - prevents permanent junction damage during overload |
Pinout & Package
AP1520SL-13 uses the SO-8 surface-mount package with exposed thermal pad (dual output and ground pins internally bonded to die pad). Pin assignments are validated per Diodes DS31174 Rev. 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider; regulates output by comparing to 0.8V internal reference |
| 2 EN | Enable control | High = normal operation; Low = full shutdown (10µA quiescent current) |
| 3 OCSET | Overcurrent threshold set | 90µA sink current flows through external ROCSET to set peak current limit |
| 4 VCC | IC power supply | Bias supply for internal circuitry; must be decoupled near pin with low-ESR capacitor |
| 5,6 Output | Switch node | Drives external inductor/diode; minimize trace area to reduce EMI and switching losses |
| 7,8 VSS | Ground return | Dual GND pins tied to die pad; require solid copper pour for thermal and noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET | Eliminates need for external high-side switch; RDS(ON) 70–150mΩ reduces BOM count and layout complexity |
| Internal compensation | Reduces external components to only inductor, input/output capacitors, feedback resistors, and ROCSET |
| Programmable overcurrent protection | ROCSET resistor sets precise current limit without external sense resistor or op-amp |
| Frequency foldback under fault | Switches from 300kHz → 30kHz during OCP/SCP to lower power dissipation and improve thermal margin |
| SO-8 thermal pad design | Dual Output and VSS pins connected to die pad enable effective heat transfer to PCB copper |
Applications
| PC Motherboard Power | LCD Monitor Supply |
|---|---|
|
Use Scenario: Regulating +5V or +3.3V rails for chipset, USB controllers, and memory interfaces on ATX-compatible motherboards. IC Role / Device Role / Timing Role: Primary step-down regulator with enable control synchronized to system power sequencing. Use Value: Delivers stable low-noise output with <0.5% load regulation and 1% line regulation across 3.6–23V input swing. |
Use Scenario: Generating bias voltages for LCD panel logic, backlight drivers, and HDMI interface circuitry. IC Role / Device Role / Timing Role: Fixed-frequency PWM buck converter providing ripple-sensitive analog and digital supply domains. Use Value: Achieves <50mVpp output ripple with standard 470µF/low-ESR input and 680µF output capacitors. |
| Graphics Card Core Supply | Networking Power Supply |
|
Use Scenario: Providing tightly regulated 1.2V–1.8V core voltage for GPU memory and logic subsystems in discrete graphics cards. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with fast transient response for dynamic GPU load changes. Use Value: Maintains ±1% output accuracy under 2A step-load transients due to internal error amplifier bandwidth and soft-start control. |
Use Scenario: Powering Ethernet PHYs, switch controllers, and PoE interface circuitry in enterprise switches and routers. IC Role / Device Role / Timing Role: Robust DC/DC converter with thermal shutdown and foldback protection for unattended operation. Use Value: Survives sustained overloads via 30kHz foldback mode and recovers automatically when fault clears. |
Availability
AP1520SL-13 is available at Aetrix Electronics and suitable for PC motherboard power, LCD monitor supply, graphics card core supply, and networking power supply requiring stable component supply despite end-of-life status.
Supply support for AP1520SL-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP1520 belongs to Diodes' legacy DC/DC converter product line, designed for cost-sensitive, space-constrained applications requiring integrated high-side FETs and minimal external components.
FAQ
Is AP1520SL-13 still in production?
No. Diodes Incorporated has officially discontinued the AP1520SL-13 with no replacement part offered. The device remains available as last-time-buy inventory with full traceability, but no future manufacturing is planned. Customers should evaluate migration paths for new designs.
What is the purpose of the OCSET pin?
The OCSET pin accepts an external resistor (ROCSET) connected between VCC and OCSET to program overcurrent protection. A 90µA internal sink current develops a voltage across ROCSET; when the switch-node voltage drops below that level during conduction, the IC triggers foldback mode at 30kHz.
Can AP1520SL-13 operate without an external diode?
No. The AP1520SL-13 integrates only a P-channel high-side MOSFET, not a synchronous rectifier. An external Schottky diode is mandatory for the freewheeling path. Using a synchronous MOSFET instead requires redesigning the control logic and gate drive - not supported by this IC.
Why does AP1520SL-13 use a P-channel MOSFET instead of N-channel?
A P-channel high-side switch eliminates the need for a floating gate driver or charge pump, simplifying design and reducing component count. This architecture trades slightly higher RDS(ON) for lower system-level complexity - ideal for cost-driven, medium-current applications like peripherals and displays.
AP1520SL-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:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 23V
- Current - Output:
- 2A
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
AP1520SL-13 FAQ
1.How can I place an order for AP1520SL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1520SL-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 AP1520SL-13 reliable?
The price and inventory of AP1520SL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1520SL-13 is usually 5 days.
3.What payment methods are accepted for AP1520SL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1520SL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1520SL-13?
AP1520SL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1520SL-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 AP1520SL-13?
For technical support, including AP1520SL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1520SL-13 requirements.
6.How does Aetrix verify that AP1520SL-13 is sourced from the original manufacturer or authorized distributors?
All AP1520SL-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 AP1520SL-13 meets industry standards.
7.What is the process for return or replacement of AP1520SL-13?
All AP1520SL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1520SL-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 AP1520SL-13 part is unused and in its original packaging.
Return procedure for AP1520SL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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