Abstract: As I/O moves from 5V to 3.3V in microprocessor systems, there is a need for power conversion from 3.3V to a lower core voltage such as 1.8V at appreciable current. Without a higher voltage available, this requires a controller that will operate on less than 3.3V and FETs that are specified at a sub-logic-level gate voltage.
As I/O moves from 5V to 3.3V in microprocessor systems, there is a need for power conversion from 3.3V to a lower core voltage such as 1.8V at appreciable current. Without a higher voltage available, this requires a controller that will operate on less than 3.3V and FETs that are specified at a sub-logic-level gate voltage.
The MAX1637 step-down controller (shown below) is guaranteed to operate with Vcc from 3.15V to 5.5V. The IRF7401 is specified with Vgs = 2.7V. In addition, the inductor is the tallest part at 4.5mm (max).
Automatic Updates
Would you like to be automatically notified when new application notes are published in your areas of interest? Sign up for EE-Mail™.
Download, PDF Format
