High efficiency linear and switching solutions for splitting a digital supply
Dave Dwelley and Gary Maulding
Abstract
This Design Note presents two methods of creating a split supply in a digital system that can provide good transient response while conserving supply current. The LT1118 specialized linear regulator, designed to source or sink current as necessary to keep its output in regulation, and the LTC1504 synchronized switching regulator are used in the examples given.
Keywords
Supply splitting
LT1118
LTC1504
It can be inconvenient to generate a split supply in a typical digital system. The classic solution is to use a pair of resistors between 5V and GND to create a 2.5V “ground” for analog circuitry (Figure 167.1 ...
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