LTM4616 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTM4616' PDF : 30 Pages View PDF
LTM4616
Applications Information
0
+120
CLKIN CLKOUT
120
+120
CLKIN CLKOUT
240
+180
CLKIN CLKOUT
(420)
60
CLKIN CLKOUT
+120
180
+120
CLKIN CLKOUT
300
CLKIN CLKOUT
PHMODE
PHASE 1
PHMODE
PHASE 3
SVIN PHMODE
PHASE 5
PHMODE
PHASE 2
PHMODE
PHASE 4
PHMODE
PHASE 6
4616 F02
Figure 2. 6-Phase Operation
0
+120
CLKIN CLKOUT
120
+120
CLKIN CLKOUT
240
+180
CLKIN CLKOUT
(420)
60
CLKIN CLKOUT
+120
180
+120
CLKIN CLKOUT
300
CLKIN CLKOUT
PHMODE
PHASE 1
PHMODE
PHASE 5
SVIN PHMODE
PHASE 9
PHMODE
PHASE 3
PHMODE
PHASE 7
PHMODE
PHASE 11
VIN
OUT1
LTC6908-2
OUT2
90
+120
CLKIN CLKOUT
210
+120
CLKIN CLKOUT
330
+180
CLKIN CLKOUT
(510)
150
CLKIN CLKOUT
+120
270
+120
CLKIN CLKOUT
(390)
30
CLKIN CLKOUT
PHMODE
PHASE 4
PHMODE
PHASE 8
SVIN PHMODE
PHASE 12
PHMODE
PHASE 6
Figure 3. 12-Phase Operation
PHMODE
PHASE 10
PHMODE
PHASE 2
4616 F03
The LTM4616 device is an inherently current mode con-
trolled device, so parallel modules will have very good cur-
rent sharing. This will balance the thermals on the design.
Tie the ITH pins of each LTM4616 together to share the
current. Current sharing is inherently guaranteed by the
current mode operation of the LTM4616’s DC/DC regula-
tors. Moreover, the accuracy of current sharing between
the two outputs is approximately ±15%. To reduce ground
potential noise, tie the ITHM pins of all LTM4616s together
and then connect to the SGND of the master at the point it
connects to the output capacitor GND. See layout guideline
in Figure 17. Figure 19 shows a schematic of the parallel
design. The FB pins of the parallel module are tied together.
Input RMS Ripple Current Cancellation
Application Note 77 provides a detailed explanation of
multiphase operation. The input RMS ripple current can-
cellation mathematical derivations are presented, and a
graph is displayed representing the RMS ripple current
reduction as a function of the number of interleaved phases.
Figure 4 shows this graph.
4616ff
14
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