Buck regulator offers switching frequencies to 1.5MHz

10th March 2014

Vishay

Staff Reporter

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Datasheet

A 4A synchronous buck regulator has been introduced by Vishay Intertechnology, expanding their microBUCK family of integrated synchronous buck regulators. The 4A device offering high programmable switching frequencies of up to 1.5 MHz and a wide input voltage range of 4.5V to 15V. The Vishay Siliconix SiP12109 features integrated high- and low-side power MOSFETs in the space-saving 3 mm by 3 mm QFN-16 package, providing designers with a complete high-current solution in only 180 mm².

The high switching frequencies of the SiP12109 enable a compact design with minimal components, making the device ideal for point of load regulation and 5 V and 12 V rails in a wide range of space-constrained computing, consumer electronics, telecom, and industrial applications. Typical end products will include network processors, DSPs, FPGAs, ASICs, high-density storage cards, TVs, set-top boxes, distributed power systems, servers, and more.

The device released today provides an adjustable output voltage down to 0.6 V with ± 1 % accuracy. The integrated MOSFETs offer peak efficiency of up to 95 % while a power-saving mode improves light load efficiency, enabling high efficiencies over the entire load range. The SiP12109'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 architecture ensures that the regulator is stable with any capacitor type and doesn't require an ESR network for loop stability.

The SiP12109 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. Vishay's free PowerCAD online simulation tool provides designers with a fast and convenient way to test and optimize circuits utilizing the SiP12109 or any other product in the microBUCK DC/DC family.

Samples and production quantities of the RoHS-compliant, halogen-free SiP12109 regulator are available now, with lead times of 12 weeks for larger orders.