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Power Electronics Europe News
Synchronous buck regulators step-down rails to PoL

The ISL8018 delivers up to 8A of continuous output current from a 2.7 to 5.5V input supply, while offering up to 97% efficiency. A sync in and sync out feature connects and synchronises multiple regulators at the same switching frequency in a master/slave configuration using a phase shifting time delay. This prevents on time overlapping and reduces RMS current, ripple and input capacitance requirements to improve EMI and efficiency. The VSET feature allows the voltage output margining to be set at ±10% to compensate for output voltage IR drop. The ISET feature provides programmable output current limits to support 8.0, 5.0 and 3.0A applications. This allows customers to leverage one design with smaller inductors for reduced costs and board area. The programmable switching frequency from 500kHz up to 4MHz enables the use of smaller passive components for faster transient response and further board space savings, says the company.

The 2 x 2mm ISL8003x family delivers up to 3A of continuous output current from a the same input supply and offers up to 95% peak efficiency for delivering general PoL conversions in telecomms, cloud computing, industrial, instrumentation and medical equipment.

The ISL80030, ISL80030A, ISL80031, and ISL80031A are pin-compatible and integrate very low RDS(ON) high-side PMOS and low-side NMOS MOSFETs, which reduces external component count and power losses. With low die temperatures, these buck regulators allow the system to operate without cooling fans or heatsinks while delivering a continuous 3A to the load to increase reliability. They also offer internal compensation, which eliminates additional external components to reduce design complexity. The complete converter occupies less than 64mm2 of board space. The ISL80031 and ISL80031A offer a light load mode to improve efficiency over all load currents when the system switches to a low power state.

The ISL8018 8A synchronous buck regulator is available now in a 3 x 4mm, 20-lead QFN package. A ISL8018DEMO1Z demonstration board is also available. The ISL80030, ISL80030A, ISL80031 and ISL80031A synchronous buck regulators are available now in 2 x 2mm, 8pin DFN packages.


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