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microBUCK regulators increase power density and transient response

Vishay Intertechnology has broadened its offering of microBUCK synchronous buck regulators with a new family of 15 A, 25 A, and 40 A devices featuring input voltages from 4.5 V to 20 V in the thermally enhanced 5 mm by 7 mm PowerPAK® MLP34-57 package.

Delivering increased power density and transient response compared to previous-generation devices, the Siliconix SiC45x family regulators offer PMBus 1.3 compliance for power system telemetry.

The high power density of the devices is made possible by co-packaging high performance n-channel trench MOSFETs with a PWM controller in a compact package. The regulators offer low operating current in idle mode, enabling peak efficiency up to 98% and reducing power losses. Intended to simplify the design of high performance point of load (POL) converters, the integrated devices require minimal external components for configuration and loop compensation.

SiC45x family regulators are internally compensated over the entire VIN and VOUT range of operation. Highly configurable, the devices combine their wide input voltage range with an adjustable output voltage from 0.3 V to 12 V. Extremely versatile these regulators are suitable for a wide range of applications, including POL converters in cloud computing, enterprise servers, and industrial computers, in addition to networking, telecom, and storage systems.

The regulators feature programmable switching frequencies from 300 kHz to 1.5 MHz and three operating modes: forced continuous conduction, power save, or ultrasonic.

The regulators' constant on-time (COT) architecture delivers ultrafast transient response with minimum output capacitance and tight ripple regulation over a broad load range. It also enables loop stability regardless of the type of output capacitor used.

Reliable operation is guaranteed with the integration of a robust set of protection and monitoring features, including output over- and under-voltage protection (OVP / UVP), overcurrent protection (OCP) in pulse by pulse mode, differential output remote sensing, and over temperature protection (OTP) with hysteresis.

Neil Tyler

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