Diodes Inc. AP63300WU-7 DC-DC Step-Down Regulator, Adjustable, 3.8-32V In, 3A,

The Diodes Inc. AP63300WU-7 is a highly efficient, synchronous step-down (buck) DC-DC converter. This compact, surface-mount regulator is designed to deliver a robust 3A of continuous output current from a wide input voltage range of 3.8V to 32V, making it exceptionally versatile for a broad array of applications.

Engineered with electromagnetic interference (EMI) reduction as a priority, it incorporates a proprietary gate driver scheme that minimises switching node ringing without compromising MOSFET performance, thereby reducing high-frequency radiated noise. Further enhancing its EMI performance is a frequency spread spectrum (FSS) feature with ±6% switching frequency jitter, which disperses emitted energy across a band to prevent concentration at any single frequency.

The device is highly integrated, featuring fully internal 75mΩ high-side and 40mΩ low-side power MOSFETs for high-efficiency power conversion. It offers comprehensive protection features including undervoltage lockout (UVLO), output overvoltage protection (OVP), cycle-by-cycle peak current limiting, and thermal shutdown. Its precision enable threshold allows for adjustable UVLO, and it supports both PFM (Pulse Frequency Modulation) and PWM (Pulse Width Modulation) operation modes for optimal efficiency across different load conditions. In shutdown mode, it draws a typical supply current of just 1µA.

Key Features & Specifications

• Topology: Synchronous Buck (Step-Down)
• Input Voltage Range: 3.8V to 32V
• Adjustable Output Voltage: 0.8V to 31V
• Continuous Output Current: 3A
• Switching Frequency: 500kHz (typical)
• High Efficiency: Up to 88%
• Package: TSOT-26 (6-pin)
• Protection Features: UVLO, OVP, peak current limit, thermal shutdown
• Special Features: Proprietary low-EMI gate driver, Frequency Spread Spectrum (FSS), PFM/PWM mode operation