Buck regulator offers switching frequencies to 4 MHz

17th December 2013

Vishay

Staff Reporter

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Datasheet

Offering high programmable switching frequencies to 4 MHz, the Siliconix SiP12108 signals an expansion of the exisiting microBUCK family of integrated synchronous buck regulators from Vishay. Providing designers with a complete high-current solution in only 180 mm², the regulator features high- and low-side power MOSFETs in a space-saving 3 mm by 3 mm QFN-16 package.

Designed for PoL regulation and 3.3V and 5V rails, the high switching frequencies of the SiP12108 enable a compact design with minimal components. Suitable for a wide range of space-constrained applications, typical end products include low-power processors, network processors, DSPs, FPGAs, ASICs, high-density storage cards, set-top boxes, DVRs, LAN/WAN equipment, and more. The device provides an input voltage range of 2.8 V to 5.5 V and adjustable output voltage down to 0.6 V with ± 1 % accuracy while a selectable power-saving mode enables efficiency to 95 % across the full range of load current. The SiP12108's current-mode constant on-time (CM-COT) architecture delivers ultra-fast transient response with minimum output capacitance and tight ripple regulation at very light loads.

The regulator offers a full protection feature set, including output undervoltage and overvoltage protection, thermal shutdown, input undervoltage lockout, internal soft start, and a power good indicator. An "A" version of the device, the SiP12108A, is available with the output undervoltage protection feature disabled. To simplify designs, the RoHS-compliant, halogen-free regulator is stable with any capacitor type and doesn't require an ESR network for loop stability.

The SiP12108 is footprint-compatible with Vishay's 3 A SiP12107, thereby offering an easy migration path to higher currents. Vishay's free PowerCAD online simulation tool provides designers with a way to test and optimize circuits utilizing the SiP12107, SiP12108, SiP12108A, or any other product in the microBUCK DC/DC family.

Suitable for a wide range of space-constrained applications, typical end products include low-power processors, network processors, DSPs, FPGAs, ASICs, high-density storage cards, set-top boxes, DVRs, LAN/WAN equipment, and more.