Boost Converter Generates Three Analog Rails

a standard boost converter consisting of IC1, C1, L1, D1, and C2 generates, in addition to the main output, two auxiliary supply rails (10V and -5V) with the addition of some small and very low-cost extra components. Such rails are useful for the analog circuitry in small handheld instruments, which often require supply voltages in excess of the signal range.
Maxim > App Notes > A/D and D/A Conversion/Sampling Circuits

Keywords: boost converter, A/D, D/A conversion, sampling circuits May 13, 2003

APPLICATION NOTE 2026
Boost Converter Generates Three Analog Rails


In Figure 1, a standard boost converter consisting of IC1, C1, L1, D1, and C2 generates, in addition to the main
output, two auxiliary supply rails (10V and -5V) with the addition of some small and very low-cost extra
components. Such rails are useful for the analog circuitry in small handheld instruments, which often require
supply voltages in excess of the signal range.




Figure 1. Adding external charge pumps to this 5V boost converter produces auxiliary analog rails of 10V
and -5V.

The main regulated output of 5V ±2% is sustained by input