Power Supply Isolation Controller Simplifies Hot Swapping the
CompactPCI Bus for 5V-/3.3-Only Applications – Design Note 253
Andy Gardner
and extraction and reports on the state of the supply
voltages via the HEALTHY# signal. Although В±12V supplies are provided on the CompactPCI
backplanes, many plug-in boards only require 5V and
3.3V. The LTC В®1646 is the ideal power supply isolation
controller for these applications. LTC1646 Feature Summary
The LTC1646 features can be summarized as follows: The LTC1646 Hot Swapв„ў controller is designed to
meet the power supply isolation requirements found
in the CompactPCI hot swap specification PICMG 2.1
for plug-in boards requiring 5V and/or 3.3V supplies.
The chip will turn a board’s supply voltages on and
off in a controlled manner, allowing the card to be
safely inserted or removed without causing glitches
on the power supplies and causing other boards in the
system to reset. It also protects against short circuits,
precharges the bus I/O connector pins during insertion
COMPACT PCI
CIRCUIT CARD
CONNECTOR
(FEMALE) Dual level, programmable circuit breakers: this feature is enabled after power-up is complete. If either
supply exceeds current limit for more than 20Ојs, …