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Intersil has launched a dual-channel step-down regulator that reduces component count and optimises design flexibility in high-power density industrial, communications and consumer electronics.

The ISL85033 integrates two high-side Mosfets that can source 3A per channel or current-share 6A on a single two-phase output.

A 4.5V to 28V input voltage range is said to make it an ideal choice for intermediate bus generation and point-of-load (PoL) regulation.

The ISL85033 includes features that maximise performance and efficiency while reducing external component count and improving design flexibility.

These include low-resistance power Mosfets optimised for thermal performance up to 3A of output current per channel.

In addition, a precision internal reference supports output voltages down to 0.8V.

The PWM regulator switches at a default frequency of 500kHz and can be user-programmed or synchronised over a 300kHz to 2MHz range, allowing user optimisation of conversion efficiency versus inductor size.

Sync-In and Sync-Out signals allow synchronising multiple ICs without the need for a system clock.

The regulator enables smooth and monotonic start-up by allowing users to select either internal or externally adjustable soft-start, along with independent, sequential, ratiometric or absolute tracking between outputs.

Independent ‘power-good’ and ‘enable’ signals provide flexible monitoring and sequencing capabilities.

User-selectable in-phase or out-of-phase switching provides flexibility to optimise input filter requirements over a range of input and output voltage combinations.

The ISL85033 can be configured in various operating modes such as a dual 3A step-down regulator, single 6A current-share step-down regulator and negative output buck-boost regulator, making it an ideal fit for a range of system requirements.

To ensure system reliability, the ISL85033 includes over-current, under-voltage lockout and thermal overload protection.

It is available in a compact 28-lead TQFN package.

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