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Diodes Incorporated AP1539SDPG-13
- Part No.:
- AP1539SDPG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1539SDPG-13.pdf
- Description:
- IC REG BUCK ADJ 4A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
AP1539SDPG-13 from Diodes Incorporated is a synchronous step-down DC/DC converter IC with integrated P-channel MOSFET, 300 kHz fixed-frequency PWM control, 3.6–18 V input range, 0.8–VCC adjustable output, and 4 A continuous output current capability. It delivers low-ripple power for microprocessor core supplies in PC motherboards and graphic cards.
For engineers reviewing the AP1539SDPG-13 datasheet, AP1539SDPG-13 pinout, AP1539SDPG-13 application, or AP1539SDPG-13 equivalent, key selection considerations include internal PMOS RDS(ON) (50 mΩ @ 12 V), thermal shutdown threshold (+150 °C), soft-start function, OCSET-adjustable current limit, and SOP-8L-DEP dual-exposed-pad thermal performance.
Technical Context
The AP1539SDPG-13 implements a voltage-mode PWM controller with internal reference (0.8 V ±2%), error amplifier, and oscillator generating 300 kHz (240–400 kHz) switching frequency. Its duty cycle linearly adjusts from 0% to 99% based on feedback error and load conditions.
Current limiting is set externally via ROCSET resistor (e.g., 6.8 kΩ for ~4 A at 12 V input), triggering frequency foldback to 50 kHz during overcurrent or short-circuit events. Thermal shutdown activates at +150 °C with +55 °C hysteresis, and under-voltage lockout disables operation below 3.3 V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6 V to 18 V - supports AC adapter input and wide industrial supply rails |
| Output Voltage Range | 0.8 V to VCC - enables core voltage regulation down to sub-1 V with external resistor divider |
| Max Output Current | 4 A continuous - sustained delivery with thermal management via dual-exposed pads |
| Switching Frequency | 300 kHz typical (240–400 kHz) - balances EMI, inductor size, and efficiency |
| RDS(ON) (P-MOS) | 50 mΩ @ VIN = 12 V - reduces conduction loss and improves full-load efficiency to 92% |
| Feedback Voltage | 0.8 V ±2% - sets precise output regulation accuracy independent of temperature and line variation |
| Thermal Shutdown | +150 °C with +55 °C hysteresis - prevents permanent junction damage during overload or poor heatsinking |
Pinout & Package
SOP-8L-DEP (Dual Exposed Pads) package with 1.27 mm pitch, 5.9–6.1 mm width, and thermally enhanced layout: exposed pad 1 connected to VSS, exposed pad 2 connected to Output (SW) node for optimal power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Monitors output voltage via resistor divider; regulates output to 0.8 V reference |
| EN (Pin 2) | Enable control | High (>2.0 V) enables operation; low (<0.8 V) shuts down all circuitry with 10 µA standby current |
| OCSET (Pin 3) | Overcurrent threshold setting | External resistor to VCC sets peak current limit; 90 µA sink current defines trip point |
| VCC (Pin 4) | Bias supply input | Powers internal circuitry; requires local 0.1 µF ceramic capacitor to VSS |
| Output (Pin 5 & 6) | Switch node (SW) | Drives external inductor/diode; dual pins reduce trace inductance and EMI; connected to exposed pad 2 |
| VSS (Pin 7 & 8) | Ground return | Power and signal ground; dual pins lower impedance; connected to exposed pad 1 |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET | Eliminates need for external high-side switch; RDS(ON) = 50 mΩ @ 12 V enables compact 4 A design |
| Internal compensation network | Reduces external component count to only inductor, input/output capacitors, diode, and feedback resistors |
| Soft-start circuit | Prevents output overshoot at startup by gradually ramping duty cycle; no external capacitor required |
| Frequency foldback protection | Switches from 300 kHz to 50 kHz during OCP/SCP events to limit power dissipation and improve fault recovery |
| Green package compliance | SOP-8L-DEP with halogen/antimony-free molding compound, lead-free terminations, and RoHS 3 compliance |
Applications
| PC Motherboard VRM | LCD Monitor Power Supply |
|---|---|
|
Use Scenario: Regulating 1.2 V CPU core voltage from 12 V rail on ATX motherboard. IC Role / Device Role / Timing Role: Primary buck controller delivering stable, low-noise core power with fast transient response. Use Value: Internal 50 mΩ PMOS and 0.8 V reference enable ±2% output accuracy and <10 mV ripple at 4 A load. |
Use Scenario: Generating 3.3 V logic supply for LCD timing controller and interface ICs. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter operating from 12 V adapter input. Use Value: 92% efficiency at 4 A and 300 kHz switching minimizes heat buildup in space-constrained display enclosures. |
| Graphic Card GPU Core Supply | ADSL Modem System Rail |
|
Use Scenario: Providing dynamic 0.8–1.1 V GPU core voltage with load-step response under gaming workloads. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with EN-controlled power sequencing and OCSET-based current limiting. Use Value: Soft-start and 50 kHz foldback protect GPU during sudden current surges and prevent thermal runaway. |
Use Scenario: Converting 12 V wall adapter output to 5 V system rail for DSL PHY and microcontroller. IC Role / Device Role / Timing Role: Compact, cost-optimized DC/DC solution meeting telecom thermal and reliability requirements. Use Value: SOP-8L-DEP dual-exposed pads provide 26 °C/W θJC, enabling reliable 4 A operation without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | N-channel MOSFET driver; requires external high-side FET; 2 MHz switching; no integrated OCSET adjustment | Better suited for ultra-compact designs needing higher frequency and smaller inductors | Select when board area is constrained and external FET selection is acceptable |
| TPS54331DR | Adjustable frequency (100–2500 kHz); external compensation; no integrated PMOS; higher quiescent current (1.8 mA) | Preferred for designs requiring programmable soft-start, sync capability, or tighter light-load efficiency | Select when system-level timing synchronization or adaptive frequency control is required |
Compared with MP2315DJ-LF-Z and TPS54331DR, AP1539SDPG-13 offers lowest BOM count due to integrated P-MOS and OCSET-based current limit, but trades off frequency flexibility and sync capability for simplicity and thermal robustness in fixed-frequency 4 A applications.
Availability
AP1539SDPG-13 is available at Aetrix Electronics and suitable for PC motherboard VRMs, LCD monitor power supplies, and ADSL modem system rails requiring stable component supply, RoHS-compliant packaging, and thermal resilience in industrial ambient conditions.
Supply support for AP1539SDPG-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 AP1539 belongs to Diodes' high-current integrated buck converter product line, designed specifically for space-constrained, thermally demanding applications requiring minimal external components and robust overcurrent/thermal protection.
FAQ
What is the recommended minimum ROCSET value for 5 V output at 12 V input?
The datasheet specifies a 3.9 kΩ resistor for 5 V output with 12 V input. This sets the current limit threshold to approximately 4 A while maintaining stability across temperature and input variation. Using a lower resistance risks premature current limiting; higher values reduce available peak current headroom.
How does the SOP-8L-DEP package improve thermal performance compared to standard SOP-8?
The SOP-8L-DEP features two isolated exposed copper pads: one tied to VSS (Pin 7/8) and one to Output (Pin 5/6). This dual-thermal-path structure achieves 26 °C/W junction-to-case thermal resistance-nearly 40% lower than standard SOP-8-enabling full 4 A operation without additional heatsinking on 2 oz copper PCBs.
Can AP1539SDPG-13 operate with input voltage below 3.6 V?
No. The under-voltage lockout circuit disables operation below 3.3 V VCC, and the recommended minimum input is 3.6 V. At inputs near this threshold, maximum output current drops below 4 A due to reduced gate drive and increased RDS(ON); operation below 3.6 V is not characterized or guaranteed.
Is the AP1539SDPG-13 qualified for automotive applications?
AP1539SDPG-13 is not AEC-Q100 qualified. Diodes Incorporated states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing-contact Diodes directly for such variants. This part is intended for commercial/industrial use only.
AP1539SDPG-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:
- Not For New Designs
- 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:
- 4A
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
AP1539SDPG-13 FAQ
1.How can I place an order for AP1539SDPG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1539SDPG-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 AP1539SDPG-13 reliable?
The price and inventory of AP1539SDPG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1539SDPG-13 is usually 5 days.
3.What payment methods are accepted for AP1539SDPG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1539SDPG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1539SDPG-13?
AP1539SDPG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1539SDPG-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 AP1539SDPG-13?
For technical support, including AP1539SDPG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1539SDPG-13 requirements.
6.How does Aetrix verify that AP1539SDPG-13 is sourced from the original manufacturer or authorized distributors?
All AP1539SDPG-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 AP1539SDPG-13 meets industry standards.
7.What is the process for return or replacement of AP1539SDPG-13?
All AP1539SDPG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1539SDPG-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 AP1539SDPG-13 part is unused and in its original packaging.
Return procedure for AP1539SDPG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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