Linear Technology DC2157A Demo Manual

Description
Demonstration circuit 2157A features the
the high efficiency, high density, dual 18A, switch mode
step-down power module regulator with ±0.8% total DC
output accuracy. The input voltage is from 4.5V to 15V.
The output voltage is programmable from 0.6V to 1.8V.
DC2157A can deliver up to 18A maximum in each channel.
With the help of external compensation, ±3% transient ac-
curacy can be achieved with 25% load step. As explained
in the data sheet, output current derating is necessary
for certain V , V , and thermal conditions. The board
IN OUT
operates in continuous conduction mode in heavy load
conditions. For high efficiency at low load currents, the
MODE jumper (JP1) selects pulse-skipping mode for noise
sensitive applications or Burst Mode
noise sensitive applications. Two outputs can be connected
in parallel for a single 36A output solution with optional
jumper resistors. The board allows the user to program
BoarD photo
DEMO MANUAL DC2157A
Dual 18A or Single 36A µModule
Regulator with ±0.8% DC and 3%
LTM 4630EY-1, how its output ramps up and down through the TRACK/
®
SS pin. The output can be set up to either coincidentally or
ratiometrically track with another supply's output. Remote
output voltage sensing is available for improved output
voltage regulation at the load point. These features and
the availability of the LTM4630-1 in a compact 16mm ×
16mm × 5.01mm BGA package make it ideal for use in
many high density point-of-load regulation applications.
The LTM4630-1 data sheet must be read in conjunction
with this demo manual for working on or modifying the
demo circuit DC2157A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2157A
operation in less
®
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
LTM4630-1
Transient Accuracy
®
dc2157afc
1