Regulators offer higher power density, better transient response

March 29, 2021 // By Jean-Pierre Joosting
Regulators offer higher power density, better transient response
Synchronous buck regulators deliver output current up to 40 A in a compact 5- x 7-mm package and feature PMBus 1.3 compliance for power system telemetry.

Vishay Intertechnology has launched a new family of microBUCK® synchronous buck regulators comprising 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, Vishay Siliconix SiC45x family regulators offer PMBus 1.3 compliance for power system telemetry.

The high power density 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. Typical applications include POL converters in cloud computing, enterprise servers, and industrial computers, in addition to networking, telecom, and storage systems.

All SiC45x family devices share the same footprint to provide designers with a scalable solution offering a cost and performance optimization while accelerating design time. 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 undervoltage protection (OVP / UVP), overcurrent protection (OCP) in pulse by pulse mode, differential output remote sensing, and over temperature protection (OTP) with hysteresis.

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