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Diodes Incorporated AP66300FVBW-13
- Part No.:
- AP66300FVBW-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 16-UQFN Exposed Pad
- Datasheet:
-
AP66300FVBW-13.pdf
- Description:
- IC REG BUCK ADJ 3A U-QFN4040-16
- Quantity:
- Payment:
- Shipping:
Inventory:2,694
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Product details
Overview
AP66300FVBW-13 from Diodes Incorporated is a 3.8V–60V input, 3A synchronous buck DC-DC converter with integrated 120mΩ high-side and 55mΩ low-side MOSFETs, 500kHz default switching frequency, 0.8V feedback reference, and internal compensation-designed for point-of-load power in telecom and FPGA supply rails.
For engineers reviewing the AP66300FVBW-13 datasheet, AP66300FVBW-13 pinout, AP66300FVBW-13 application, or AP66300FVBW-13 equivalent, key selection criteria include input voltage range (3.8–60V), output current capability (3A continuous), adjustable output (0.8–50V), low quiescent current (43μA typ), and thermal protection with 125°C junction limit.
Technical Context
The AP66300FVBW-13 employs current-mode control with internal loop compensation, enabling stable operation across wide output capacitance ranges and fast transient response. Its dual-MOSFET architecture supports both PFM and forced PWM modes via MSYNC pin, with zero-cross detection and hiccup-mode overcurrent protection.
It integrates an internal 4.8V LDO regulator powered from VIN or BIAS (≥4.5V), reducing system power loss. The device supports pre-biased start-up, external soft-start/tracking (SS/TR), and programmable switching frequency (300kHz–2.5MHz) via FS resistor, while maintaining ±5% power-good accuracy with internal 5MΩ pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.8V to 60V - supports wide-input industrial, telecom, and battery-derived supplies without external pre-regulation. |
| IOUT Max | 3A continuous - delivers full rated load at ambient up to +85°C with standard PCB layout and thermal vias. |
| VFB Reference | 0.800V ±8mV - enables precise output regulation from 0.8V to 50V using standard resistive divider. |
| fSW Default | 500kHz (±12%) - balances efficiency and size; adjustable to 300kHz–2.5MHz for EMI or efficiency optimization. |
| IQ | 43μA typical - ensures ultra-low standby power in always-on systems such as network management controllers. |
| RDS(ON) HS/Low-Side | 120mΩ / 55mΩ - minimizes conduction loss at 3A, supporting >95% peak efficiency in enhanced bias mode. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor heatsinking without latch-off. |
Pinout & Package
The AP66300FVBW-13 is housed in a Green U-QFN4040-16/SWP (Type UXB) package with 0.4mm pitch, exposed thermal pad (EPAD), and wettable flank leads for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Bias supply input | Switches internal LDO sourcing from VIN to BIAS when ≥4.5V, improving efficiency in 5–15V output designs. |
| VCC (2) | Internal LDO output | Requires 1μF ceramic bypass to PGND; powers gate drivers and control circuitry; inactive when EN = low. |
| VIN (3,4) | Main power input | Accepts 3.8–60V; must be bypassed with bulk capacitor; feeds both power switches and internal regulator. |
| BST (5) | Bootstrap supply | Connects 0.1μF+ capacitor between BST and SW to generate gate drive voltage for high-side N-FET. |
| SW (6,7) | Switching node | Drives external LC filter; high di/dt node requiring tight layout and Kelvin connection to BST capacitor. |
| PGND (8,9) | Power ground | Must be connected to EPAD via multiple thermal vias; separates high-current return path from analog ground. |
| EN (10) | Enable control | Logic-level input (1.38–1.52V threshold); ties to VIN for automatic startup; 40MΩ internal pull-down. |
| FS (11) | Frequency select | Resistor-to-GND sets fSW; open or tied to VCC yields 500kHz default; supports EMI spread-spectrum tuning. |
| MSYNC (12) | Mode/sync control | GND = PFM; VCC = forced PWM; external clock input enables synchronization to system master clock. |
| PG (13) | Power-good flag | Open-drain output with internal 5MΩ pull-up; asserts low during soft-start or ±5% VOUT deviation. |
| SS/TR (14) | Soft-start/tracking | Capacitor-to-GND sets ramp time; tied to VCC enables 1.7ms internal soft-start; supports ratiometric sequencing. |
| FB (15) | Feedback input | Senses output via resistive divider; 0.8V reference enables accurate regulation independent of temperature or line variation. |
| GND (16) | Analog ground | Single-point tie to EPAD; isolates noise-sensitive control circuitry from high-current PGND paths. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Efficiency Mode with Bias | Enables >95% peak efficiency by routing internal LDO current from BIAS instead of VIN when output ≥5V. |
| Pre-biased Output Startup | Allows safe turn-on into pre-charged output capacitors without reverse inductor current or output overshoot. |
| External Soft-Start & Tracking | Supports sequential, ratiometric, or absolute voltage ramping across multiple rails using shared SS/TR networks. |
| Hiccup-Mode Overcurrent Protection | Enters auto-retry shutdown on overcurrent, limiting average power dissipation and preventing thermal runaway. |
| Integrated Power MOSFETs | Eliminates external high-side/low-side FETs and drivers, reducing BOM count, footprint, and layout complexity. |
Applications
| Telecom Point-of-Load | FPGA Core Supply |
|---|---|
Use Scenario: Regulating 48V backplane to 1.2V/3A for FPGA core logic in 5G baseband units. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering tightly regulated, low-noise core voltage with fast transient response. Use Value: Internal compensation and current-mode control maintain stability with minimal output capacitance, reducing board area and cost. | Use Scenario: Generating 0.85V @ 3A for ASIC I/O banks in network switch line cards. IC Role / Device Role / Timing Role: Adjustable-output buck converter with precise 0.8V reference and ±5% PG accuracy for rail monitoring. Use Value: Pre-biased startup prevents output collapse during hot-swap events, ensuring uninterrupted link training. |
| Distributed Power System | Home Audio DSP Supply |
Use Scenario: Converting 24V intermediate bus to 5V/3A for microcontroller and interface ICs in industrial gateways. IC Role / Device Role / Timing Role: High-voltage input buck regulator with wide VIN range and integrated MOSFETs for compact local regulation. Use Value: 60V max input withstands load-dump transients in 24V systems without external TVS clamping. | Use Scenario: Providing clean 3.3V/2A supply to audio DSP and ADC in premium soundbars. IC Role / Device Role / Timing Role: Low-IQ (43μA) buck converter operating in PFM mode during idle periods to minimize standby power. Use Value: 95% peak efficiency and <20mV ripple at 3A reduce thermal load and audible switching noise in sensitive analog sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 3.3–36V input, 0.8V ref, 2A output, fixed 520kHz fSW, no BIAS pin or PFM mode. | Limited to lower input voltage; lacks bias efficiency boost and soft-start tracking capability. | Select when input ≤36V and design prioritizes simplicity over wide-VIN flexibility and sequencing. |
| TPS54332DR | 3.5–28V input, 0.8V ref, 3A output, adjustable fSW (200–2500kHz), external compensation required. | Requires external loop compensation components; no integrated BIAS path or hiccup OCP. | Choose when full loop tuning is needed and thermal derating above 28V is acceptable. |
Compared with MP2451DT-LF-Z and TPS54332DR, the AP66300FVBW-13 uniquely combines 60V input tolerance, internal compensation, BIAS-enabled efficiency, and multi-rail tracking-making it optimal for high-reliability distributed power where input transients and rail coordination matter.
Availability
AP66300FVBW-13 is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA power delivery, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP66300FVBW-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The AP66300 belongs to Diodes' high-voltage synchronous buck converter product line, engineered for robust point-of-load conversion in telecom, industrial, and consumer systems demanding wide input range and minimal external components.
FAQ
What is the minimum recommended input voltage for reliable operation?
The AP66300FVBW-13 requires a minimum input voltage of 3.8V to ensure proper UVLO release and stable gate drive for both MOSFETs. Below this, the internal 4.8V LDO cannot regulate, causing erratic switching or shutdown. Operation at exactly 3.8V is validated across temperature and load, but margin should be maintained for line drop in real systems.
How does the BIAS pin improve efficiency in 5V output designs?
When BIAS is connected to VOUT (5V–15V), the internal LDO draws current from BIAS instead of VIN, bypassing the higher-drop path through the input supply. This reduces power loss in the LDO stage-verified to increase peak efficiency by up to 2.5% at 12VIN/5VOUT compared to VIN-only operation.
Can the AP66300FVBW-13 safely start into a pre-biased output?
Yes-the AP66300FVBW-13 supports pre-biased start-up by disabling the low-side MOSFET during soft-start, preventing reverse inductor current and output voltage collapse. This behavior is inherent to its current-mode architecture and requires no external circuitry or configuration.
What thermal performance can be expected on a standard 2-layer FR-4 board?
On a 1" square, 2oz copper FR-4 board per JEDEC standards, the AP66300FVBW-13 achieves θJA = 46°C/W. At 3A load and 24VIN/5VOUT, junction temperature rise is ~65°C above ambient-keeping TJ within the 125°C operating limit at +60°C ambient, provided the EPAD is connected with ≥6 thermal vias.
AP66300FVBW-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-UQFN Exposed Pad
- 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):
- 3.8V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 50V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- U-QFN4040-16/SWP (Type UXB)
AP66300FVBW-13 FAQ
1.How can I place an order for AP66300FVBW-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP66300FVBW-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 AP66300FVBW-13 reliable?
The price and inventory of AP66300FVBW-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP66300FVBW-13 is usually 5 days.
3.What payment methods are accepted for AP66300FVBW-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP66300FVBW-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP66300FVBW-13?
AP66300FVBW-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP66300FVBW-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 AP66300FVBW-13?
For technical support, including AP66300FVBW-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP66300FVBW-13 requirements.
6.How does Aetrix verify that AP66300FVBW-13 is sourced from the original manufacturer or authorized distributors?
All AP66300FVBW-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 AP66300FVBW-13 meets industry standards.
7.What is the process for return or replacement of AP66300FVBW-13?
All AP66300FVBW-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP66300FVBW-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 AP66300FVBW-13 part is unused and in its original packaging.
Return procedure for AP66300FVBW-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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