INTEGRATED BUCK REGULATOR WITH PROGRAMMABLE LDO

The Vishay Siliconix SiC402B an advanced stand-alone synchronous buck regulator featuring integrated power MOSFETs, bootstrap switch, and a programmable LDO in a space-saving PowerPAK MLP55-32L pin packages.The SiC402B are capable of operating with all ceramic solutions and switching frequencies up to 1 MHz. The programmable frequency, synchronous operation and selectable power-save allow operation at high efficiency across the full range of load current. The internal LDO may be used to supply 5 V for the gate drive circuits or it may be bypassed with an external 5 V for optimum efficiency and used to drive external n-channel MOSFETs or other loads. Additional features include cycle-by-cycle current limit, voltage soft-start, under-voltage protection, programmable over-current protection, soft shutdown and selectable power-save. The Vishay Siliconix SiC402B also provides an enable input and a power good output.

• High efficiency > 95 %
• 10 A continuous output current capability
• Integrated bootstrap switch
• Programmable 200 mA LDO with bypass logic
• Temperature compensated current limit
• All ceramic solution enabled
• Pseudo fixed-frequency adaptive on-time control
• Programmable input UVLO threshold
• Independent enable pin for switcher and LDO
• Selectable ultra-sonic power-save mode (SiC402A)
• Selectable power-save mode (SiC402B)
• Programmable soft-start and soft-shutdown
• 1 % internal reference voltage
• Power good output
• Over-voltage and under-voltage protections