Direct Effi cient DC/DC Conver

Direct Effi cient DC/DC Conversion of 100V Inputs for Telecom/AutomoTIve Supplies

AutomoTIve, telecom and industrial systems have harsh,

unforgiving environments that demand robust electronic

systems. In telecom systems the input rail can vary from

36V to 72V, with transients as high as 100V. In automoTIve

systems the DC battery voltage may be 12V, 24V or 42V

with load dump condiTIons causing transients up to 60V

or more. The LTC®3810 is a current mode synchronous

switching regulator controller that can directly step

down input voltages up to 100V, making it ideal for these

harsh environments. The ability to step down the high

input voltage directly allows a simple single inductor

topology, resulting in a compact high performance power

supply—in contrast to the low side drive topologies that

require bulky, expensive transformers.