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Diodes Incorporated AP1513SG-U
- Part No.:
- AP1513SG-U
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1513SG-U.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,335
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Product details
Overview
AP1513SG-U from Diodes Incorporated is a PWM-controlled 2A step-down DC/DC converter with integrated P-channel MOSFET, 300kHz fixed-frequency operation, 3.6V–18V input range, and adjustable 0.8V–VCC output. It delivers high efficiency (92% at 5V/2A), low-ripple power, and built-in soft-start, over-current, short-circuit, and thermal shutdown protection - ideal for microprocessor core supplies and portable device power rails.
For engineers reviewing the AP1513SG-U datasheet, AP1513SG-U pinout, AP1513SG-U application, or AP1513SG-U equivalent, key selection considerations include its internal PMOS switch, OCSET current-limit programming, FB voltage accuracy (±2%), SO-8 thermal performance (θJA = 134°C/W), and enable-controlled startup sequencing in space-constrained PCB layouts.
Technical Context
The AP1513SG-U implements a fixed-frequency PWM control architecture with linear duty-cycle modulation (0–100%) and an internal 0.8V reference. Its error amplifier compares FB voltage against this reference to regulate output, while the oscillator generates a stable 300kHz switching signal independent of load or input variation.
Current limiting is externally programmable via ROCSET connected to VCC and OCSET, where a 90µA internal sink current sets the threshold. Under over-current or short-circuit conditions, the device reduces switching frequency from 300kHz to 30kHz to limit power dissipation and maintain safe operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 18V - supports AC adapter inputs and wide-battery-range systems without external pre-regulation. |
| Output Current | Up to 2A continuous - sufficient for CPU/GPU core rails and FPGA I/O banks in embedded and telecom equipment. |
| Feedback Voltage | 0.8V ±2% - enables precise output regulation down to 0.8V with minimal external resistor tolerance impact. |
| Switching Frequency | 300kHz typical - balances EMI control, inductor size (22–33µH), and efficiency across load conditions. |
| RDS(ON) | 70–150mΩ (VIN = 12V) - defines conduction loss and thermal rise in the integrated P-MOSFET under full load. |
| Soft-Start Time | 0.3–5ms - prevents input surge and output overshoot during power-up in sensitive digital systems. |
| Efficiency | 92% at VIN = 12V, VOUT = 5V, IOUT = 2A - reduces thermal load and extends battery life in portable applications. |
Pinout & Package
AP1513SG-U is housed in a thermally enhanced SO-8 package with dual output pins (5 & 6) and dual ground pins (7 & 8) internally bonded to the die pad for improved heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider to set output voltage; high-impedance (0.1µA bias) for minimal loading error. |
| 2 EN | Enable control | Active-high logic input; <20µA leakage ensures low quiescent current when disabled. |
| 3 OCSET | Over-current threshold setting | Accepts external resistor to program current limit; 90µA internal sink enables accurate IOUT(MAX) calibration. |
| 4 VCC | IC supply input | Power source for internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor near pin. |
| 5, 6 Output | Switch node | Drives external inductor/diode; dual-pin layout minimizes trace inductance and EMI radiation. |
| 7, 8 VSS | Ground reference | Dual GND pins reduce ground bounce and improve stability; connect directly to large copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET | Eliminates external high-side switch, reducing BOM count and PCB area while maintaining 2A capability. |
| Programmable over-current protection | ROCSET resistor allows precise current limit tuning across input voltage and temperature variations. |
| Frequency foldback under fault | Reduces switching frequency to 30kHz during OCP/SCP, lowering power dissipation and enabling safe fault recovery. |
| Internal compensation network | Minimizes external components - only FB divider, input/output capacitors, inductor, and Schottky diode required. |
| SO-8 thermal design | Dual output and ground pins tied to die pad support >2A operation with standard FR-4 PCB layout (2oz copper). |
Applications
| Microprocessor Core Supply | PC Motherboard VRM |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/2A power to ARM Cortex-A series SoCs in industrial gateways. IC Role / Device Role / Timing Role: Primary buck regulator delivering dynamically scaled core voltage with fast transient response. Use Value: Soft-start and 0.8V FB reference enable sub-1.2V core rail generation; 92% efficiency reduces thermal stress on dense PCBs. |
Use Scenario: Generating +3.3V/2A auxiliary rail for chipset I/O and PCIe slot power on ATX motherboards. IC Role / Device Role / Timing Role: Secondary buck converter supporting standby and active-state power domains. Use Value: Enable pin allows synchronized power sequencing with main CPU VRM; SO-8 footprint simplifies layout near VRM controller. |
| LCD Monitor Power | Networking Power Supply |
Use Scenario: Supplying +5V/2A to LED backlight drivers and TCON logic in 24-inch commercial displays. IC Role / Device Role / Timing Role: Main DC/DC stage converting 12V adapter input to stable display subsystem rail. Use Value: 300kHz switching enables compact 33µH inductor; low ripple (<50mV p-p) prevents visible flicker in high-brightness modes. |
Use Scenario: Delivering +3.3V/2A to Ethernet PHYs and packet processors in managed switches. IC Role / Device Role / Timing Role: Point-of-load regulator meeting IEEE 802.3af power integrity requirements. Use Value: Built-in thermal shutdown and current limit ensure reliable operation under PoE-induced ambient temperature spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z (Monolithic Power) | Higher 1.5A rated current, 1.5MHz switching, requires external N-MOSFET and compensation. | Better suited for ultra-compact designs needing smaller inductors; lacks integrated PMOS and OCSET programming. | Select when board space is critical and higher frequency trade-offs (EMI, efficiency drop at light load) are acceptable. |
| TPS54202DRCT (Texas Instruments) | 2A synchronous buck, 4.5–17V input, 0.8V reference, but no OCSET pin - uses internal current sense. | Offers better light-load efficiency via Eco-mode; lacks programmable over-current threshold for custom fault thresholds. | Prefer when precise current-limit customization is unnecessary and integrated FETs with synchronous rectification are required. |
Compared with MP1584EN-LF-Z and TPS54202DRCT, AP1513SG-U provides unique OCSET-based current limit tuning and integrated P-MOSFET simplicity, making it optimal for cost-sensitive, thermally constrained, and fault-programmable 2A buck applications where 300kHz operation meets EMI targets.
Availability
AP1513SG-U is available at Aetrix Electronics and suitable for PC motherboard VRMs, LCD monitor power stages, and networking PoE subsystems requiring stable component supply, long-lifecycle availability, and RoHS-compliant green packaging.
Supply support for AP1513SG-U 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 AP1513SG-U belongs to Diodes' PWM-controlled DC/DC converter product line, designed specifically for cost-effective, thermally robust, and easy-to-implement point-of-load regulation in space-constrained applications.
FAQ
What is the minimum recommended input capacitor value for AP1513SG-U?
A 470µF low-ESR aluminum electrolytic capacitor is recommended for most applications, placed close to the VCC and VSS pins. This value satisfies RMS current rating (≈1A) and provides adequate hold-up during transients. For high-reliability designs, parallel 0.1µF ceramic improves high-frequency decoupling.
How does the OCSET pin set over-current threshold?
The OCSET pin sinks a precise 90µA current. When an external resistor (ROCSET) connects VCC to OCSET, the resulting voltage sets the current limit threshold. The peak inductor current at which OCP triggers follows IPEAK ≈ (VOCSET × RDS(ON)) / (2 × ΔIL), where ΔIL depends on L and fSW.
Can AP1513SG-U operate with input voltage below 3.6V?
No - the under-voltage lockout (UVLO) disables operation below 3.3V and re-enables only above 3.5V. Operation below 3.6V violates the recommended operating condition and risks unstable regulation or uncontrolled shutdown. For sub-3.6V inputs, consider a different regulator such as AP3418.
Is thermal derating required for AP1513SG-U at 85°C ambient?
Yes - at TA = 85°C, maximum output current must be reduced due to θJA = 134°C/W. With 1.5W dissipation (at 2A, 12V→5V), junction temperature rises ~200°C above ambient, exceeding 125°C TJMAX. Derate to ≤1.2A or enhance PCB copper area and airflow to maintain safe TJ.
AP1513SG-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 2A
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
AP1513SG-U FAQ
1.How can I place an order for AP1513SG-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1513SG-U 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 AP1513SG-U reliable?
The price and inventory of AP1513SG-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1513SG-U is usually 5 days.
3.What payment methods are accepted for AP1513SG-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1513SG-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1513SG-U?
AP1513SG-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1513SG-U 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 AP1513SG-U?
For technical support, including AP1513SG-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1513SG-U requirements.
6.How does Aetrix verify that AP1513SG-U is sourced from the original manufacturer or authorized distributors?
All AP1513SG-U 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 AP1513SG-U meets industry standards.
7.What is the process for return or replacement of AP1513SG-U?
All AP1513SG-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1513SG-U, 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 AP1513SG-U part is unused and in its original packaging.
Return procedure for AP1513SG-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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