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How to convert 3.6v to Transducer excitation 21 volts

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suncq

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I have a project about battery powered telemetry unit now. Battery is 3.6 voltage. I need to convert this voltage to Transducer excitation 21 volts (@ 200mA).Because It will be into ADC channel. the ripple voltage need be as little as possible.
any tip? thanks in advance!
suncq@126.com
 

blueroomelectronics

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200ma at 21volts will require more than 1.4A from the 3.6V battery since any voltage multiplier will not be 100% efficient. Better have some pretty hefty batteries.
 

blueroomelectronics

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National Semiconductor make boost ICs. Make sure it's rated for at least 2Amps
Usually it's an IC, powerfet, diode & Inductor.
 

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