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Diodes Incorporated AP1513SG-13
- Part No.:
- AP1513SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1513SG-13.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,893
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Product details
Overview
AP1513SG-13 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 voltage. It delivers high efficiency (92% at 5V/2A), low ripple, soft-start, over-current and short-circuit protection, and thermal shutdown - used in PC motherboard VRMs and LCD monitor power rails.
For engineers reviewing the AP1513SG-13 datasheet, AP1513SG-13 pinout, AP1513SG-13 application, or AP1513SG-13 equivalent, key selection criteria include internal PMOS RDS(ON) (70–150 mΩ), OCSET current-sensing interface, SO-8 thermal resistance (θJA = 134°C/W), enable logic polarity, and feedback reference accuracy (±2% over temp).
Technical Context
The AP1513SG-13 implements a fixed-frequency PWM control architecture with linear duty-cycle adjustment (0–100%), internal 0.8V reference, and error amplifier for closed-loop regulation. Its oscillator operates at 300kHz typ (240–400kHz range), with frequency reduction to 30kHz during over-current or short-circuit events.
It integrates a P-channel high-side switch, soft-start circuit (0.3–5ms), under-voltage lockout (UVLO active below 3.3V), and internal compensation - eliminating need for external loop compensation components. Current limiting is set via external resistor on OCSET pin using 90µA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 18V - supports AC adapter inputs and wide-input industrial rails without pre-regulation. |
| Output Current | 2A continuous - sufficient for microprocessor core supplies and graphics card auxiliary rails. |
| Switching Frequency | 300kHz typical - balances EMI performance and inductor size; drops to 30kHz during fault conditions for safe current limiting. |
| Feedback Reference | 0.8V ±2% - enables precise output setting down to 0.8V with external resistor divider (e.g., 3.3V @ RA/RB = 3.125). |
| RDS(ON) | 70–150 mΩ (at VIN = 12V) - defines conduction loss and thermal rise in high-current buck stages. |
| Soft-Start Time | 0.3–5ms - prevents output overshoot and inrush current during power-up of sensitive loads. |
| Efficiency | 92% at VIN = 12V, VOUT = 5V, IOUT = 2A - reduces thermal load and improves battery runtime in portable systems. |
Pinout & Package
AP1513SG-13 is housed in an SO-8 mini package with exposed thermal pad (dual Output and VSS pins internally connected to die pad). The package supports 134°C/W junction-to-ambient thermal resistance on standard 2oz FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider; regulates output by comparing against 0.8V internal reference. |
| 2 EN | Enable control | High = normal operation; Low = full shutdown (10µA quiescent); TTL-compatible threshold (VSH = 2.0V, VSL = 0.8V). |
| 3 OCSET | Over-current sense | Sink current (90µA typ) flows through external ROCSET to set current limit threshold per design equation. |
| 4 VCC | IC supply input | Powers internal circuitry; requires local 0.1µF + 470µF low-ESR decoupling near pins 4/7/8. |
| 5, 6 Output | Switch node | Drives external inductor/diode; dual pins minimize trace inductance and EMI; connect to thermal pad for heat dissipation. |
| 7, 8 VSS | Ground return | Power ground; dual pins reduce impedance; must tie directly to low-impedance ground plane near input/output capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET | Eliminates need for external high-side switch; RDS(ON) optimized for 2A load with minimal BOM count. |
| Internal compensation network | Removes requirement for external Type-II/III compensation components - simplifies layout and validation. |
| Programmable over-current protection | ROCSET resistor sets peak current limit independent of input voltage and inductor value - enables robust fault handling. |
| Thermal shutdown + UVLO | Protects IC under overload or low-VIN; resumes operation only after VCC > 3.5V and die temperature falls below trip point. |
| SO-8 Green package | Lead-free, halogen-free, antimony-free construction compliant with RoHS 2 and JEDEC MSL-1 standards. |
Applications
| PC Motherboard VRM | LCD Monitor Power Supply |
|---|---|
|
Use Scenario: Regulating +5V or +3.3V rails for chipset I/O and display interface logic. IC Role / Device Role / Timing Role: Primary synchronous buck controller supplying stable low-noise power to timing-critical display controllers. Use Value: Soft-start prevents reset glitches during system boot; 92% efficiency reduces board-level heat near sensitive analog video circuits. |
Use Scenario: Generating +5V/2A for backlight inverter control and panel logic in 15–24" LCD monitors. IC Role / Device Role / Timing Role: High-efficiency step-down regulator interfacing with AC adapter input (12–19V) and driving constant-current LED drivers. Use Value: 300kHz switching enables compact 22–33µH inductors; OCSET programmability allows precise current limiting for inverter startup surge protection. |
| Graphics Card Auxiliary Rail | Networking Power Supply |
|
Use Scenario: Providing +2.5V or +1.8V for GPU memory interface buffers and PCIe PHY circuitry. IC Role / Device Role / Timing Role: Secondary buck stage delivering low-noise, fast-transient power adjacent to high-speed digital ICs. Use Value: Excellent load regulation (±0.5%) ensures signal integrity across PCIe lanes; dual VSS pins minimize ground bounce during burst-mode GPU activity. |
Use Scenario: Powering Ethernet PHYs, PoE controllers, and management microcontrollers in enterprise switches and routers. IC Role / Device Role / Timing Role: Input-flexible DC/DC converter accepting 12V or 48V-derived intermediate bus (via pre-regulator) and delivering isolated logic rails. Use Value: Wide 3.6–18V input accommodates varied intermediate bus voltages; thermal shutdown prevents latch-up during PoE cable fault conditions. |
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 1.5MHz switching frequency; external N-MOSFET; no integrated OCSET current sensing. | Requires external current-sense resistor and gate driver; better suited for space-constrained designs needing smaller inductors. | Select when board area is critical and design team has experience implementing external current sensing. |
| LM2678SD-ADJ/NOPB (TI) | 5A rating; 260kHz fixed frequency; external N-MOSFET; no soft-start or OCSET pin. | Lacks programmable over-current protection and integrated soft-start; requires external RC soft-start network. | Prefer when higher output current is required and fault protection can be implemented externally. |
Compared with MP1584EN-LF-Z and LM2678SD-ADJ/NOPB, AP1513SG-13 provides plug-and-play current limiting via OCSET, eliminates external gate drive complexity, and delivers verified 2A performance in SO-8 - reducing design cycle time for mid-power industrial and computing applications.
Availability
AP1513SG-13 is available at Aetrix Electronics and suitable for PC motherboard VRMs, LCD monitor power supplies, and networking equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant green packaging.
Supply support for AP1513SG-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 AP1513 belongs to Diodes' PWM step-down converter product line, engineered for cost-sensitive, medium-current applications where integration, thermal reliability, and ease of use outweigh ultra-high-frequency or multi-rail flexibility.
FAQ
What is the recommended inductor value for AP1513SG-13 at 5V/2A output?
For 5V/2A operation with 12V input, Diodes recommends a 33µH inductor with 2.15A DC rating and low DCR. Inductor ripple current should be ~0.3A (15% of 2A), and saturation current must exceed peak switch current (≥2.5A). Standard shielded drum-core types like TDK VLS201610HBX-330M meet these requirements.
How does the OCSET pin set over-current protection threshold?
The OCSET pin sinks a precise 90µA (typ) current. Connecting ROCSET from VCC to OCSET sets VOCSET = IOCSET × ROCSET. When the voltage drop across the internal MOSFET's RDS(ON) exceeds VOCSET, over-current protection activates. For 2A limit at 12V input, ROCSET ≈ 10kΩ yields ~0.9V threshold.
Can AP1513SG-13 operate with input voltage below 3.6V?
No - the under-voltage lockout (UVLO) disables operation below 3.3V and prevents restart until VCC rises above 3.5V. Operation below 3.6V violates the Recommended Operating Conditions and risks unstable regulation or uncontrolled switching. Use a different regulator (e.g., AP3418) for sub-3.6V inputs.
Is thermal pad connection required for SO-8 package reliability?
Yes - the SO-8 package's exposed thermal pad (connected internally to pins 5, 6, 7, 8) must be soldered to a minimum 100mm² copper pour on the PCB. Without this, θJA degrades beyond 134°C/W, risking thermal shutdown at ≤1.2A load. Diodes' recommended pad layout specifies 4.612mm × 6.50mm stencil opening.
AP1513SG-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:
- 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-13 FAQ
1.How can I place an order for AP1513SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1513SG-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 AP1513SG-13 reliable?
The price and inventory of AP1513SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1513SG-13 is usually 5 days.
3.What payment methods are accepted for AP1513SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1513SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1513SG-13?
AP1513SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1513SG-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 AP1513SG-13?
For technical support, including AP1513SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1513SG-13 requirements.
6.How does Aetrix verify that AP1513SG-13 is sourced from the original manufacturer or authorized distributors?
All AP1513SG-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 AP1513SG-13 meets industry standards.
7.What is the process for return or replacement of AP1513SG-13?
All AP1513SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1513SG-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 AP1513SG-13 part is unused and in its original packaging.
Return procedure for AP1513SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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