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LTM4608A
APPLICATIONS INFORMATION
provide more output current without increasing input and
output voltage ripple. The CLKIN pin allows the LTM4608A
to synchronize to an external clock (between 0.75MHz
and 2.25MHz) and the internal phase locked loop allows
the LTM4608A to lock onto CLKIN’s phase as well. The
CLKOUT signal can be connected to the CLKIN pin of the
following LTM4608A stage to line up both the frequency
and the phase of the entire system. Tying the PHMODE
pin to SV IN , SGND or SV IN /2 (floating) generates a phase
difference (between CLKIN and CLKOUT) of 180°, 120°
or 90° respectively, which corresponds to a 2-phase,
3-phase or 4-phase operation. A total of 6 phases can be
cascaded to run simultaneously with respect to each other
by programming the PHMODE pin of each LTM4608A to
different levels. For a 6-phase example in Figure 2, the
2nd stage that is 120° out of phase from the 1st stage
can generate a 240° (PHMODE = 0) CLKOUT signal for
the 3rd stage, which then can generate a CLKOUT signal
that’s 420°, or 60° (PHMODE = SV IN ) for the 4th stage.
With the 60° CLKIN input, the next two stages can shift
120° (PHMODE = 0) for each to generate a 300° signal
for the 6th stage. Finally, the signal with a 60° phase shift
on the 6th stage (PHMODE is floating) goes back to the
1st stage. Figure 3 shows the configuration for 12-phase
operation.
A multiphase power supply significantly reduces the
amount of ripple current in both the input and output
capacitors. The RMS input ripple current is reduced by,
and the effective ripple frequency is multiplied by, the
number of phases used (assuming that the input voltage
is greater than the number of phases used times the output
voltage). The output ripple amplitude is also reduced by
the number of phases used.
0
120
240
(420)
60
180
300
CLKIN CLKOUT
+120
CLKIN CLKOUT
+120
CLKIN CLKOUT
+180
CLKIN CLKOUT
+120
CLKIN CLKOUT
+120
CLKIN CLKOUT
PHMODE
PHASE 1
PHMODE
PHASE 3
S VIN
PHMODE
PHASE 5
PHMODE
PHASE 2
PHMODE
PHASE 4
PHMODE
PHASE 6
4608A F02
Figure 2. 6-Phase Operation
0
120
240
(420)
60
180
300
CLKIN CLKOUT
+120
CLKIN CLKOUT
+120
CLKIN CLKOUT
+180
CLKIN CLKOUT
+120
CLKIN CLKOUT
+120
CLKIN CLKOUT
PHMODE
PHMODE
S VIN
PHMODE
PHMODE
PHMODE
PHMODE
4608 F02
V +
OUT1
LTC6908-2
OUT2
PHASE 1
90
PHASE 5
210
PHASE 9
330
PHASE 3
(510)
150
PHASE 7
270
PHASE 11
(390)
30
CLKIN CLKOUT
+120
CLKIN CLKOUT
+120
CLKIN CLKOUT
+180
CLKIN CLKOUT
+120
CLKIN CLKOUT
+120
CLKIN CLKOUT
PHMODE
PHASE 4
PHMODE
PHASE 8
S VIN
PHMODE
PHASE 12
PHMODE
PHASE 6
PHMODE
PHASE 10
PHMODE
PHASE 2
4608A F03
Figure 3. 12-Phase Operation
4608afd
13
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