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Diodes Incorporated AP1520SG-13
- Part No.:
- AP1520SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1520SG-13.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
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Product details
Overview
AP1520SG-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, and internal compensation. It delivers low-ripple output (e.g., <5mV at 2A) across 3.6–23V input, supports microprocessor core supply and LCD monitor power rails, and features enable, overcurrent, short-circuit, and thermal shutdown protections.
For engineers reviewing the AP1520SG-13 datasheet, AP1520SG-13 pinout, AP1520SG-13 application, or AP1520SG-13 equivalent, key selection considerations include its SO-8 package footprint, FB-based adjustable output (0.8V to VCC), OCSET-configurable current limit, EN-controlled startup, and discontinuation status requiring legacy design support or migration planning.
Technical Context
The AP1520SG-13 implements a voltage-mode PWM controller with internal 0.8V reference and error amplifier, regulating output via feedback at the FB pin. Its oscillator operates at 300kHz (240–360kHz range), dropping to 10kHz during overcurrent or short-circuit events to reduce stress and heat.
It integrates a 70–150mΩ P-channel MOSFET (RDS(ON)), supports soft-start (0.3–2ms), and includes under-voltage lockout (UVLO: 3.3V turn-off, 3.5V turn-on). Current limiting is set externally via ROCSET using a 90µA sink current at OCSET, enabling precise IOUT(MAX) configuration per application load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 23V - Supports wide-input applications including AC adapter-derived rails and industrial 12–24V systems. |
| Output Voltage Range | 0.8V to VCC - Adjustable via external resistor divider on FB pin; enables 1.2V, 1.8V, 3.3V, 5V, or custom core/logic supplies. |
| Switching Frequency | 300kHz typical (240–360kHz) - Balances EMI, inductor size (22–33µH typical), and efficiency for compact PCB layouts. |
| Max Output Current | 2A continuous - Limited by internal MOSFET RDS(ON) and thermal resistance (θJA = 134°C/W in SO-8). |
| Feedback Reference | 0.8V ±2% - High-accuracy reference enables tight output regulation (±0.2% load, ±1% line regulation). |
| Efficiency | 92% at 12VIN/5VOUT/2A - Achieved via low-RDS(ON) P-MOS and optimized gate drive minimizing switching losses. |
| Thermal Shutdown | +150°C threshold with +55°C hysteresis - Prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
AP1520SG-13 uses the SO-8 surface-mount package (4.9mm × 6.0mm, 1.27mm pitch), with dual output pins (5 & 6) and dual ground pins (7 & 8) internally bonded to the die pad for enhanced thermal and current handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider output; regulates VOUT to 0.8V at this node - requires short, noise-immune trace routing away from inductors. |
| 2 EN | Enable control | High (≥2.0V) enables regulation; low (≤0.8V) disables all circuitry - used for sequencing, standby, or system-level power control. |
| 3 OCSET | Overcurrent threshold set | Sink pin biased by external ROCSET; sets current limit via 90µA typical current - determines peak switch current before foldback. |
| 4 VCC | IC bias supply | Powers internal circuitry; must be decoupled with ≥0.1µF ceramic capacitor close to pin - also supplies ROCSET network. |
| 5, 6 Output | Switch node | Connects to inductor and external Schottky diode anode; high di/dt path - minimize loop area to suppress EMI and voltage spikes. |
| 7, 8 VSS | Power ground | Return path for IC bias, feedback, and switch current; dual pins reduce ground impedance and improve thermal conduction to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET | RDS(ON) = 70–150mΩ at 12VIN - eliminates external high-side switch, reduces BOM count, and simplifies layout for buck topology. |
| Internal compensation | No external compensation components required - reduces solution size and eliminates tuning effort while maintaining stability across 0.1–2A loads. |
| Programmable current limit | Set via single external resistor (ROCSET) using 90µA sink - enables precise IPEAK control without current-sense resistors or amplifiers. |
| Frequency foldback under fault | Switches from 300kHz → 10kHz during OCP/SCP - lowers power dissipation and thermal stress during sustained overload or shorted output. |
| SO-8 thermal design | Dual Output and VSS pins connected to die pad - allows direct thermal coupling to large PCB copper areas, improving θJA beyond standard SO-8 limits. |
Applications
| PC Motherboard Power | LCD Monitor Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 1.2V/1.8V core voltage to Intel/AMD chipset VRM controllers or memory interface logic. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable low-voltage rail with fast transient response to handle burst current demands. Use Value: Internal 0.8V reference and 92% efficiency minimize heat generation near sensitive analog sections and reduce cooling requirements. |
Use Scenario: Generating 3.3V or 5V backlight and logic supply in flat-panel LCD monitors powered from 12V or 19V adapters. IC Role / Device Role / Timing Role: Main DC/DC converter converting unregulated adapter output into tightly regulated display subsystem rails. Use Value: 3.6–23V input range accommodates variable adapter voltages; low ripple (<5mV) prevents visible screen noise or flicker. |
| Graphic Card Auxiliary Rail | Networking Power Supply |
|
Use Scenario: Supplying 1.0V–1.5V auxiliary voltage to GPU memory buffers or PCIe interface circuitry in discrete graphics cards. IC Role / Device Role / Timing Role: Secondary buck regulator supporting non-core functions where space and thermal constraints limit use of larger solutions. Use Value: SO-8 footprint and internal MOSFET allow compact placement near target loads; EN pin enables dynamic rail enable/disable during GPU power states. |
Use Scenario: Delivering 3.3V or 5V to Ethernet PHYs, switch controllers, or PoE interface ICs in enterprise switches and routers. IC Role / Device Role / Timing Role: Point-of-load regulator converting mid-rail (e.g., 12V backplane) to low-voltage digital logic supplies. Use Value: Built-in OCP and thermal shutdown ensure robust operation in fanless or high-ambient networking enclosures without external protection circuitry. |
Availability
AP1520SG-13 is available at Aetrix Electronics and suitable for legacy PC motherboard power, LCD monitor supply, and graphic card auxiliary rail designs requiring stable component supply despite end-of-life status.
Supply support for AP1520SG-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 devices for industrial, computing, and consumer markets.
The AP1520 belongs to Diodes' legacy DC/DC converter product line, designed specifically for cost-sensitive, space-constrained portable and peripheral equipment requiring integrated-PFET buck regulation with minimal external components.
FAQ
Is AP1520SG-13 still in production?
No - AP1520SG-13 is officially obsolete and discontinued by Diodes Incorporated, with no replacement part offered. Aetrix Electronics maintains limited legacy stock for last-time buys and repair programs, but no new manufacturing is planned. Customers should initiate migration to active alternatives such as the AP6320x or DIODES AP65350 series for new designs.
What is the function of the OCSET pin?
The OCSET pin sinks a precise 90µA (typical) current to set the overcurrent threshold. An external resistor (ROCSET) between VCC and OCSET establishes a voltage threshold; when the switch-node voltage drops below that level during conduction, overcurrent protection activates and reduces switching frequency to 10kHz. This enables accurate, resistor-programmable current limiting without sense resistors.
Can AP1520SG-13 operate without an external diode?
No - AP1520SG-13 integrates only a P-channel high-side MOSFET and requires an external Schottky diode connected from the Output pins (5 & 6) to VSS to provide the freewheeling path during MOSFET off-time. Unlike synchronous buck converters, it lacks a low-side switch, so the diode is mandatory for proper buck operation and energy transfer.
Why does AP1520SG-13 use two VSS and two Output pins?
The dual VSS (pins 7 & 8) and dual Output (pins 5 & 6) are internally connected to the same die pad in the SO-8 package. This design reduces thermal resistance (θJA) and current path impedance, improving power dissipation and EMI performance. PCB layout must tie both VSS pins to a common ground plane and both Output pins to the inductor with minimal trace length and area.
AP1520SG-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:
- 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
AP1520SG-13 FAQ
1.How can I place an order for AP1520SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1520SG-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 AP1520SG-13 reliable?
The price and inventory of AP1520SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1520SG-13 is usually 5 days.
3.What payment methods are accepted for AP1520SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1520SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1520SG-13?
AP1520SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1520SG-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 AP1520SG-13?
For technical support, including AP1520SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1520SG-13 requirements.
6.How does Aetrix verify that AP1520SG-13 is sourced from the original manufacturer or authorized distributors?
All AP1520SG-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 AP1520SG-13 meets industry standards.
7.What is the process for return or replacement of AP1520SG-13?
All AP1520SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1520SG-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 AP1520SG-13 part is unused and in its original packaging.
Return procedure for AP1520SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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