DC/DC converters for portable computers
Steve Pietkiewicz and Jim Williams
Abstract
DC/DC converters for portable computers are discussed.
Keywords
DC/DC converter
LT1073
LT1173
LT1072
Portable computers require simple and efficient converters for 5V power and display driving. A regulated 5V supply can be generated from two AA cells using the circuit shown in Figure 161.1. U1, an LT1073-5 micropower DC/DC converter, is arranged as a step-up, or “boost” converter. The 5V output, monitored by U1’s SENSE pin, is internally divided down and compared to a 212mV reference voltage inside the device. U1’s oscillator turns on when the output drops below 5V, cycling the switch on and off at a 19kHz rate. This action alternately causes ...
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