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LDO controllers offer 'digital-enable' feature

Posted: 28 Jan 2008     Print Version  Bookmark and Share

Keywords:LDO  buck controller  power saving 

Intersil Corp. has released a new family of triple sync buck PWM and LDO controller designed to be extremely flexible, operating in a wide input voltage range of 4.5V to 24V.

The ISL9440, ISL9440A and ISL9441 offer an independent "digital enable" feature that allows designers to save power and board space. The digital enable feature on the controllers affords "green" power savings by offering the ability to shut down device rails that are not in use. The digital enable features on the ISL9440, ISL9440A and ISL9441 controllers can also be logic-driven for sequencing to avoid using additional chips, saving cost and board space. In addition, the digital enable feature provides better control for sequencing on power rails than standard analog soft-start.

All three members of this new family of triple sync buck controllers help control noise within the system by offering out-of-phase switching to minimise spikes.

For system and data safety, the ISL9440 and ISL9440A feature an "Early Warning" VIN detection feature that allows 5.5µs for the system to perform functions like writing key registers to memory before the system loses power completely. For customers with certain specific 5V applications, the ISL9441 without "Early Warning" VIN can be selected.

The ISL9440, ISL9440A and ISL9441 are available in 32-ld QFN package for at Rs.184.36 ($4.67) each in 1,000-unit quantities.

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