The SiC414 from Vishay Siliconix is an advanced standalone synchronous buck regulator that features integrated power MOSFETs, a bootstrap diode, and an internal 5V LDO within a compact MLPQ 4x4 - 28 pin package. It supports switching frequencies up to 1MHz and can operate with all-ceramic solutions, making it highly efficient across the entire load current range. The device includes programmable frequency, synchronous operation, and selectable power-save modes, allowing it to maintain high efficiency under various conditions. The internal LDO can either supply 5V for gate drive circuits or be bypassed externally for optimal efficiency, driving external n-channel MOSFETs or other loads. Additional features include cycle-by-cycle current limiting, voltage soft-start, under-voltage protection, programmable overcurrent protection, soft shutdown, and selectable ultra-sonic power-save modes.

The SiC414 offers several key advantages, including:

• High efficiency exceeding 95%
• Continuous output current capability up to 6A
• Integrated bootstrap switch
• Integrated 5V/200mA LDO with bypass logic
• Temperature-compensated current limiting
• Pseudo fixed-frequency adaptive on-time control
• All-ceramic solution enabled
• Programmable input UVLO threshold
• Independent enable pin for switcher and LDO
• Selectable ultra-sonic power-save mode
• Internal soft-start and soft-shutdown
• 1% internal reference voltage
• Power good output and over-voltage protection
• Halogen-free according to IEC 61249-2-21 definition
• Compliant to RoHS directive 2002/95/EC

The SiC414 finds application in a variety of devices, such as:

• Notebook, desktop, and server computers
• Digital HDTVs and digital consumer electronics
• Networking and telecommunication equipment
• Printers, DSL modems, and set-top boxes
• Embedded systems
• Point-of-load power supplies

Figure 1. Functional block diagram of SiC414

Figure 2. Typical application circuit diagram of SiC414