APPLICATION NOTE 1162

A 3.3V Input Step-Down Converter for CPU Cores


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).

A 3.3V Input Step-Down Converter for CPU Cores
3.3V to 1.8V @ 4A


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APP 1162:
APPLICATION NOTE 1162,AN1162, AN 1162, APP1162, Appnote1162, Appnote 1162