Regulator circuit generates both 3.3V and 5V outputs from 3.3V or 5V to run computers and RS232
David Dinsmore and Richard Markell
Abstract
Regulator circuits to generate both 3.3V and 5V outputs from 3.3V or 5V to run computers and RS232 are described.
Keywords
Voltage conversion
LT1111
LT1157
RS232 operation
LT1330
Many portable microprocessor-based systems use a mix of 3.3V and 5V circuits. Some are still using only 5V and inevitably some systems will end up being solely 3.3V based. If accessories are to be plugged into, or connected to, any of these systems, a voltage conversion/power generation problem presents itself. The circuit shown in Figure 22.1 addresses the situation where either 5V or 3.3V power is available ...
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