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dc1245afa
DEMO MANUAL DC1245A
Description
LTM4616
Dual 2.7V
IN(MIN)
, 8A Step-Down
µModule Regulator
Demonstration circuit 1245A features the
LTM
®
4616
, the
high efficiency, high density, dual output switch mode
power module. The rated load current is 8A for each chan-
nel, while derating is necessary for certain V
IN
, V
OUT
, and
thermal conditions. By applying a clock signal to the CLKIN
pin, the module’s switching frequency may be synchronized
from 0.75MHz to 2.25MHz. The same clock frequency is
available at the CLKOUT pin with the phase relationship
between CLKIN and CLKOUT determined by the PHMODE
pin. This feature can be used not only to reduce undesirable
L
, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
perForMAnce sUMMArY
BoArD photo
frequency harmonics but also to parallel the two channels
of LTM4616 or even multiple LTM4616s and LTM4608s to
provide higher output currents. The LTM4616 data sheet
must be read in conjunction with this demo manual prior
to working on or modifying demo circuit DC1245A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1245A
(T
A
= 25°C)
PARAMETER
CONDITIONS
VALUE
Input Voltage Range
2.7V to 5.5V
Output Voltage V
OUT1
V
OUT2
V
IN
= 3.3V, I
OUT1
= 8A
I
OUT2
= 8A
1.8 ±2%
1.2 ±2%
Maximum Continuous Output Current
Derating Is Necessary for Certain V
IN
, V
OUT
, and Thermal
Conditions, See Data Sheet for Details
8A
DC
Each Channel
Default Operating Frequency
1.5MHz
Efficiency
V
IN
= 5V, V
OUT1
= 1.8V, V
OUT2
= 1.2V, 8A Per Channel
77.5%, See Figure 3 for More Information
Load Transient
V
IN
= 3.3V, V
OUT1
=1.8V; V
OUT2
= 1.2V
See Figures 4 and 5 for Details
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