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Diodes Incorporated AP6508FE-13
- Part No.:
- AP6508FE-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 14-UFDFN Exposed Pad
- Datasheet:
-
AP6508FE-13.pdf
- Description:
- IC REG BUCK CONV DFN4030-14
- Quantity:
- Payment:
- Shipping:
Inventory:4,490
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Product details
Overview
AP6508FE-13 from Diodes Incorporated is a 500 kHz, 4.5–21 V input, 3 A synchronous buck DC/DC converter with integrated high- and low-side MOSFETs (RDS(ON) = 120 mΩ / 20 mΩ), internal compensation, and Power Good output. It delivers up to 93% efficiency at 12 VIN/5 VOUT, supports adjustable output down to 0.807 V, and is used in TV sets, gaming consoles, and distributed power systems.
For engineers reviewing the AP6508FE-13 datasheet, AP6508FE-13 pinout, AP6508FE-13 application, or AP6508FE-13 equivalent, key selection criteria include its current-mode control architecture, external soft-start programmability, thermal shutdown (140 °C), 500 kHz fixed-frequency operation, and DFN4030-14 exposed-pad package for thermal management.
Technical Context
The AP6508FE-13 implements peak-current-mode control with built-in slope compensation to suppress subharmonic oscillation at half-switching frequency. Its error amplifier features internal 200 kΩ/50 pF compensation, clamped output (2.1 V max), and 0.807 V reference with ±13 mV tolerance over –40 °C to +85 °C.
It integrates a 5 V bias regulator (±5% line regulation), cycle-by-cycle overcurrent protection with fold-back frequency reduction (to 150 kHz at VFB ≤ 300 mV), and UVLO with 4.2 V rising threshold and 200 mV hysteresis. The open-drain PG pin asserts high after soft-start when VFB reaches 90% of target and de-asserts at 70%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 21 V - supports 5 V, 12 V, and 19 V rails common in consumer power systems |
| Output Current | 3 A continuous - sufficient for core logic rails in set-top boxes and audio amplifiers |
| Switching Frequency | 500 kHz (±150 kHz) - enables compact magnetics (e.g., 3.3 µH) and balances EMI vs. efficiency |
| Feedback Reference | 0.807 V (±13 mV) - sets precise output voltage via resistor divider; enables 1.2 V to 5 V outputs with <1% error |
| High-Side RDS(ON) | 120 mΩ - limits conduction loss at 3 A (0.36 W dissipation), supporting >90% efficiency at mid-load |
| Low-Side RDS(ON) | 20 mΩ - reduces synchronous rectification loss, critical for light-load efficiency and thermal performance |
| Thermal Shutdown | 140 °C with 20 °C hysteresis - protects die during sustained overload or poor PCB heatsinking |
| Power Good Threshold | Rising at 0.9 × VFB, falling at 0.7 × VFB - enables reliable power sequencing with 20 µs delay and 4 mA sink capability |
Pinout & Package
The AP6508FE-13 is housed in a RoHS-compliant, thermally enhanced Green DFN4030-14 package with an exposed pad (EP) that must be soldered to a PCB ground plane for optimal θJA = 52 °C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply rail | Accepts 4.5–21 V; requires local 22 µF ceramic decoupling; wide trace mandatory |
| 2–5 SW | Switch node | Drives external inductor; carries high di/dt; shared pins reduce parasitic inductance |
| 6 BST | Bootstrap supply | Connects to SW via 0.1 µF ceramic capacitor to bias high-side driver |
| 7 EN | Enable control | Active-high; 1.3 V typical threshold with 0.4 V hysteresis; supports resistor-divider startup |
| 8 FB | Voltage feedback input | Senses resistor divider output; 10–50 nA bias current affects high-R divider accuracy |
| 9 PG | Power Good indicator | Open-drain output; pulled high externally; asserts after soft-start when VOUT ≥ 90% target |
| 10 SS | Soft-start timing | Sinks 10.5 µA; external capacitor extends default 2 ms ramp time linearly |
| 11 VCC | Bias regulator output | 5 V internal supply; requires 0.1–0.22 µF ceramic decoupling; max 0.22 µF capacitance |
| 12–13 GND | Power ground | Primary return for switch current; must connect to solid ground plane with multiple vias |
| 14 AGND | Analog ground | Reference for FB, PG, SS; isolated from noisy GND paths to minimize sensing error |
| EP | Exposed thermal pad | No internal connection; must be soldered to GND plane for thermal conduction and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | Eliminates external high- and low-side switches; reduces BOM count and layout complexity for 3 A designs |
| Internal Compensation | 200 kΩ/50 pF network enables stable loop response without external components-reduces design iteration time |
| Current-Mode Control | Provides inherent line/load regulation and fast transient response (<100 µs recovery from 1.5 A → 3 A step) |
| Programmable Soft-Start | 10.5 µA constant-current source allows precise control of inrush current and output voltage ramp rate |
| Power Good Output | Enables safe power sequencing in multi-rail systems (e.g., SoC core + I/O voltage ramps) |
| Thermal & OCP Protection | Combines cycle-by-cycle current limiting (5.8 A trip) with 140 °C thermal shutdown and automatic hysteresis recovery |
Applications
| Gaming Console Core Rail | TV Mainboard Power |
|---|---|
Use Scenario: Powers GPU or CPU core voltage (1.2 V @ 2.5 A) in compact handheld or console designs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated core supply with fast load-step response. Use Value: 93% efficiency at 12 VIN/1.2 VOUT minimizes heat in sealed enclosures; 500 kHz switching enables small 3.3 µH inductor footprint. | Use Scenario: Generates 3.3 V or 5 V main logic rail for TV SoCs and display controllers. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with Power Good signaling for system reset coordination. Use Value: PG output ensures downstream logic only initializes after stable 3.3 V rail; DFN4030-14 package fits tight board spacing near HDMI/USB interfaces. |
| Set-Top Box DC Distribution | Home Audio DSP Supply |
Use Scenario: Provides 1.8 V or 2.5 V supply to demodulator and video decoder ICs in cable/satellite receivers. IC Role / Device Role / Timing Role: Secondary buck stage in distributed power architecture, fed from 12 V intermediate bus. Use Value: Wide 4.5–21 V input range accommodates aging 12 V wall adapters; UVLO (4.2 V) prevents brownout operation during line dips. | Use Scenario: Supplies clean 1.2 V rail to digital signal processors in premium soundbars and AV receivers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck regulator with analog ground separation to preserve audio SNR. Use Value: Dedicated AGND pin and internal 50 pF compensation reduce output ripple to <10 mVpp, avoiding audible artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 4.5–24 V input, 3 A, 500 kHz, no PG output, 120/25 mΩ MOSFETs | Lacks Power Good and analog ground separation; simpler sequencing but less system-level control | Preferred where cost and minimal feature set outweigh need for rail monitoring |
| TPS54331DR | 3.5–28 V input, 3 A, 570 kHz, external compensation, 105/55 mΩ MOSFETs | Requires external RC compensation and boot capacitor; higher RDS(ON) increases conduction loss at 3 A | Chosen when design flexibility (e.g., variable frequency, custom loop tuning) is prioritized over integration |
Compared with MP2315DJ-LF-Z and TPS54331DR, the AP6508FE-13 offers superior thermal performance (lower RDS(ON) pair), integrated PG and AGND for noise-sensitive systems, and factory-compensated stability-reducing validation effort for consumer-grade 3 A loads.
Availability
AP6508FE-13 is available at Aetrix Electronics and suitable for TV sets, gaming consoles, and set-top boxes requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AP6508FE-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 high-efficiency power management solutions for consumer, computing, and industrial markets.
The AP6508 belongs to Diodes' high-integration synchronous buck converter product line, designed specifically for space-constrained, cost-sensitive consumer electronics needing minimal external components and robust protection.
FAQ
What is the minimum recommended input capacitance for AP6508FE-13?
A 22 µF X5R/X7R ceramic capacitor placed adjacent to the IN and GND pins is required to handle RMS input ripple current and suppress high-frequency switching noise. Larger values (e.g., 47 µF) improve hold-up during line transients but are not mandatory for basic operation.
How does the AP6508FE-13 implement current limit fold-back?
When FB voltage drops to 300 mV (indicating overload or short), the oscillator frequency reduces from 500 kHz to 150 kHz, lowering peak inductor current by ~30%. This prevents thermal runaway while maintaining regulation under fault conditions until shutdown activates.
Can the AP6508FE-13 operate with an input voltage below 4.5 V?
No. The absolute minimum operating input is 4.5 V per specification; operation below this triggers UVLO (rising threshold 4.2 V). Below 4.5 V, the internal 5 V bias regulator cannot sustain proper gate drive, causing erratic switching or complete disable.
What is the purpose of the separate AGND pin on the AP6508FE-13?
The AGND pin provides a dedicated low-noise reference for the feedback amplifier, Power Good comparator, and soft-start circuit. Routing sensitive analog signals through AGND-separate from high-current power GND-reduces offset errors and improves output voltage accuracy to ±1.6% over temperature.
AP6508FE-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- 14-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN4030-14
AP6508FE-13 FAQ
1.How can I place an order for AP6508FE-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP6508FE-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 AP6508FE-13 reliable?
The price and inventory of AP6508FE-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP6508FE-13 is usually 5 days.
3.What payment methods are accepted for AP6508FE-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP6508FE-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP6508FE-13?
AP6508FE-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP6508FE-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 AP6508FE-13?
For technical support, including AP6508FE-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP6508FE-13 requirements.
6.How does Aetrix verify that AP6508FE-13 is sourced from the original manufacturer or authorized distributors?
All AP6508FE-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 AP6508FE-13 meets industry standards.
7.What is the process for return or replacement of AP6508FE-13?
All AP6508FE-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP6508FE-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 AP6508FE-13 part is unused and in its original packaging.
Return procedure for AP6508FE-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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