6A step-down power supply voltage regulator technology based on SiC414 design - News - Global IC Trade Starts Here Free Join

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SiC414 integrates 5V/200mA LDO 6A step-down power supply regulator with switching frequency up to 1MHz, all using ceramic capacitors. Continuous output current up to 6A, efficiency greater than 95%, internal soft start and soft shutdown, mainly used in notebook computers , desktop and server, digital HDTV and consumer electronics, networking and communications equipment, printers, DSL and STB, embedded applications and point load power supplies. This article describes the main features of SiC414, functional block diagrams, typical application circuit diagrams and SiC414 evaluation board circuit diagrams. And a bill of materials (BOM).

The Vishay Siliconix SiC414 is an advanced stand-alone synchronous buck regulator featuring integrated power MOSFETs, bootstrap diode, and an internal 5 V LDO in a space-saving MLPQ 4 x 4 - 28 pin package.

The DRAM414 is 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 softstart, under-voltage Protection, programmable over-current protection, soft shutdown and selectable power-save. The Vishay Siliconix SiC414 also provides an enable input and a power good output.

Main features of SiC414:

• High efficiency > 95 %

• 6 A continuous output current capability

• Integrated bootstrap switch

• Integrated 5 V/200 mA LDO with bypass logic

• Temperature compensated current limit

• 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

SiC414 application:

• Notebook, desktop and server computers

• Digital HDTV and digital consumer applications

• Networking and telecommunication equipment

• Printers, DSL and STB applications

• Embedded applications

• Point of load power supplies

Figure 1. Functional block diagram of SiC414

Figure 2. Typical application circuit diagram of SiC414