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dc2194af
DEMO MANUAL DC2194A
Description
LTM4642IY
20V
IN
, DUAL 4A or SINGLE 8A
DC/DC µMODULE REGULATOR
Demonstration circuit of DC2194A features the
, the wide input voltage, high efficiency and
power density, dual 4A or single 8A DC/DC step-down
µModule regulator. The step-down regulator operates
from an input voltage range of 4.5V to 20V (or 2.5V min.
with 5V external bias voltage at CPWR) and provides an
adjustable output voltage range from 0.6V to 5V at 4A load
current per channel. The part is capable of operating in
dual phase single output, delivers up to 8A load current
with interleaved two phases at 180 degrees. Differential
output voltage sensing is available on Channel 1 for ap-
plications requiring more accurate output load regulation.
A user-selectable mode input is provided to allow users to
trade off ripple noise for light load efficiency: Discontinu-
ous Mode (DCM) of operation delivers higher efficiency
at light load while Continuous Conduction Mode (CCM) is
BoarD photo
preferred for noise sensitive applications. The mode pin
can also be used to sync the switching frequency to an
external clock. Programmable switching frequency range
is from 600kHz to 1400kHz with a ±30% synchronization
capture range. Constant on time, valley current mode
control architecture and integrated internal control loop
compensation allow very fast transient response to line
and load changes while maintaining loop stability.
It is recommended to read the data sheet and demo
manual of LTM4642 prior using or making any changes
to DC2194A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2194A
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
