Stepdown Regulators Integrate Low-R_DS(ON) Switches

Dec 12, 2007 4:29 PM

Maxim Integrated Products’ MAX8833/MAX8855 are stepdown regulators that operate from 3.3-V or 2.5-V inputs, provide dual 3-A or dual 5-A outputs (respectively), and integrate low R_DS(ON) internal MOSFETs (49 mΩ and 37 mΩ, respectively). The internal MOSFETs provide much better performance in low-voltage applications compared to their discrete counterparts, which require higher voltages for full enhancement.

The devices can provide efficiencies on the order of 95% while switching above 1 MHz. To increase design flexibility, each device provides a programmable frequency up to 2 MHz and an external frequency-synchronization input. Each device is available in a 5-mm x 5-mm, 32-pin TQFN package to allow interchangeability as current requirements change. Pricing starts at $2.59 for the MAX8833 and $3.41 for the MAX8855, both for 10,000 pieces.

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