The Diodes Incorporated AP63300WU-7 is a compact, high-efficiency 3A synchronous step-down DC/DC converter designed for applications requiring a wide input-voltage range, low standby power consumption and reduced electromagnetic interference.
The device operates from a wide 3.8V to 32V input voltage range and provides up to 3A continuous output current, making it suitable for converting common 5V, 12V and 24V power buses to lower regulated supply rails. Its adjustable output is based on an accurate 0.8V ±1% reference voltage.
AP63300 integrates both power MOSFETs required for synchronous buck conversion. The internal high-side MOSFET has a typical 75mΩ RDS(on), while the low-side MOSFET is approximately 40mΩ, reducing external component count and helping improve conversion efficiency.
A major advantage of the AP63300 is its low-power performance. In Pulse Frequency Modulation operation, typical quiescent current is only 22uA, while typical shutdown current is approximately 1uA. This makes the device suitable for battery-powered, standby-sensitive and always-on power systems.
The converter operates at a typical 500kHz switching frequency and uses peak current-mode control together with an integrated loop-compensation network. This architecture simplifies external circuit design and reduces the number of components required for a complete step-down power supply.
The AP63300 is specifically optimized for improved EMI performance. Its proprietary gate-driver architecture helps suppress switching-node ringing, while Frequency Spread Spectrum (FSS) spreads switching energy across a wider frequency range to reduce concentrated EMI emissions. The AP63300 also supports PFM/PWM operation, allowing improved efficiency at light loads.
Additional functions include low-dropout mode, precision Enable control, adjustable undervoltage lockout, output overvoltage protection, cycle-by-cycle peak current limiting and thermal shutdown, providing a practical combination of efficiency, control and protection for compact power systems.
The specific AP63300WU-7 ordering code uses a compact TSOT26 / TSOT-23-6 surface-mount package. The -7 suffix indicates tape-and-reel packaging, with a standard full-reel quantity of 3,000 pieces. DigiKey currently lists this part as Active.
Key Features
- Manufacturer: Diodes Incorporated
- Part Number: AP63300WU-7
- Product Type: Synchronous Buck Converter
- Topology: Step-Down / Buck
- Number of Outputs: 1
- Input Voltage Range: 3.8V to 32V
- Continuous Output Current: 3A
- Minimum Adjustable Output Voltage: 0.8V
- Reference Voltage: 0.8V ±1%
- Typical Quiescent Current: 22uA
- Typical Shutdown Current: 1uA
- Typical Switching Frequency: 500kHz
- High-Side MOSFET RDS(on): 75mΩ
- Low-Side MOSFET RDS(on): 40mΩ
- Synchronous Rectification
- Peak Current-Mode Control
- Integrated Loop Compensation
- PFM / PWM Operation
- Light-Load High-Efficiency Mode
- Frequency Spread Spectrum (FSS)
- Enhanced EMI Reduction
- Low-Dropout Mode
- Precision Enable
- Adjustable UVLO
- Output Overvoltage Protection
- Cycle-by-Cycle Peak Current Limit
- Thermal Shutdown Protection
- Fixed Soft-Start
- Operating Ambient Temperature: -40°C to +85°C
- Package: TSOT26 / TSOT-23-6
- Package Code: WU
- Mounting Type: Surface Mount / SMD
- Packaging: Tape & Reel
- Standard Reel Quantity: 3,000 pcs
- Product Status: Active
Typical Applications
- 5V Distributed Power Supplies
- 12V Power Bus Conversion
- 24V Power Bus Conversion
- Point-of-Load Power Supplies
- Flat-Screen TVs and Monitors
- Power Tools
- Laser Printers
- White Goods
- Small Home Appliances
- FPGA Power Supplies
- DSP Power Supplies
- ASIC Power Supplies
- Home Audio Equipment
- Network Systems
- Gaming Consoles
- Consumer Electronics
- Industrial Electronics
- Embedded Power Systems
The AP63300WU-7 is well suited for designs requiring a compact 32V-input, 3A synchronous buck converter with low quiescent current, integrated MOSFETs and enhanced EMI performance.
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