Step-down controller claims widest input range

Edited by the Electronicstalk editorial team Sep 25, 2007

Dual-output buck controller runs from the industry's widest input voltage range, accepting inputs from 3.3 to 25V, and producing outputs from +0.6 to +5.0V.

Intersil's ISL6228 high-performance dual-output buck controller for notebook peripheral computing applications is capable of operating over the industry's widest input voltage range (3.3 to 25V) and has a highly flexible output voltage range from +0.6 to +5.0V.

These broad voltage ranges, combined with dual independent switchers, make this controller the ideal choice for notebook peripheral applications, as well as a host of general purpose communications, storage, security and industrial automation applications.

Intersil's R3 (robust ripple regulator) technology provides the dynamic response to input voltage and output load transients required by today's faster, more powerful notebook processors.

Thus the controller provides unmatched transient response, switching efficiency and design flexibility.

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 200 and 600kHz based on the requirement of the load transient.

This programmable PWM delivers superior switching efficiency and enhanced design flexibility.

Efficiency is further maximised 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 multifunction power-good pin.

With integrated MOSFET drivers 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.