Power Management Design Guide for Altera® FPGAs and CPLDs ...
Power Management Design Guide for Altera® FPGAs and CPLDs ...
Power Management Design Guide for Altera® FPGAs and CPLDs ...
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Reference designs<br />
Cyclone <strong>FPGAs</strong><br />
This complete reference design<br />
is based on National’s smallest<br />
new switching regulators. The<br />
LM2734 features up to 1A<br />
I OUT from a tiny Thin SOT-23<br />
package, while the LM3671<br />
(also in SOT-23) provides onboard<br />
synchronous rectification<br />
<strong>for</strong> maximum efficiency <strong>and</strong><br />
the least number of external<br />
components. Both devices are<br />
available in high switching<br />
frequencies <strong>for</strong> small designs<br />
using tiny, passive elements.<br />
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Cyclone Complete <strong>Power</strong> Supply Reference <strong>Design</strong><br />
(3.3V in, 1.5V @ 1A <strong>and</strong> 1.8V @ 600 mA out)<br />
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Cyclone Complete <strong>Power</strong> Supply Reference <strong>Design</strong><br />
(5V in, 1.5V @ 1.5A <strong>and</strong> 2.5V @ 600 mA out)<br />
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This complete reference design<br />
<strong>for</strong> Cyclone <strong>FPGAs</strong> utilizes the<br />
LM3671 <strong>and</strong> LM2651. Both<br />
synchronous buck switching<br />
regulators provide ultrahigh<br />
efficiency <strong>and</strong> require<br />
minimal external components.<br />
By changing R5, V CCIO can<br />
be adjusted to fit different<br />
requirements than 2.5V I/O<br />
st<strong>and</strong>ards.<br />
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This complete reference design<br />
can be used <strong>for</strong> virtually any<br />
Cyclone FPGA. The wide V IN<br />
range (8V to 40V) allows the<br />
use of many industrial rails (12V,<br />
24V, 36V) as well as unregulated<br />
“wall warts.” Based on National’s<br />
SIMPLE SWITCHER ® regulator<br />
family, the LM267x provides 5A<br />
<strong>and</strong> 3A, while other members of<br />
the family have output currents<br />
of 2A, 1A, <strong>and</strong> 0.5A. The<br />
LM267x family is available in<br />
LLP packaging <strong>and</strong> WEBENCH<br />
design tools are available.<br />
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Cyclone Complete <strong>Power</strong> Supply Reference <strong>Design</strong><br />
(12V in, 1.5V @ 5A <strong>and</strong> 3.3V @ 3A out)<br />
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