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Buck controller touts fast transient response

Posted: 02 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:dual-output buck controller? notebook peripheral computing? MOSFET driver?

ISL6228

Intersil Corp. has released the ISL6228 dual-output buck controller designed for notebook peripheral computing applications. Through the use of patented R3 Technology, this controller provides fast transient response, switching efficiency and design flexibility, said Intersil.

The ISL6228 operates over the industry's widest input voltage range (3.3V to 25V) and has a highly flexible output voltage range from 0.6 to 5V. These broad voltage ranges, combined with dual independent switchers, make the controller well suited for notebook peripheral applications and general purpose communications, storage, security and industrial automation applications.

Intersil's R3 (Robust Ripple Regulator) Technology provides dynamic response to input voltage and output load transients required by today's faster, more powerful notebook processors. The R3 Technology represents a hybrid of fixed-frequency PWM control and variable-frequency hysteretic control to produce the industry's fastest transient response.

The ISL6228 features a self-adjusting PWM that sets to the most efficient switching frequency between 200kHz and 600kHz based on the requirement of the load transient. This programmable PWM delivers superior switching efficiency and enhanced design flexibility. Efficiency is further maximized by automatic switching between continuous-conduction-mode (CCM) and diode-emulation-mode (DEM) during light loads.

The ISL6228 features enhanced fault protection against undervoltage, overvoltage, overcurrent and overtemperature. The device also has a DCR inductor and fault ID, all of which are monitored through a multi-function PGOOD pin.

With an integrated MOSFET driver and bootstrap diode, the ISL6228 further eliminates the need for external components, lowering BOM and saving board space for designs.

The ISL6228 is available now in a 28-lead TQFN package and is priced at $2.20 per unit in 1,000-unit quantities for bulk packaging and $2.25 per unit for tape-and-reel packaging.




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