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LTM4627
APPLICATIONS INFORMATION
? 60.4k = R TB
t SOFT-START = 0.6V ? ?
R TA =
+ FB – TRACK
its final value from the slave’s regulation point. Voltage
tracking is disabled when V TRACK is more than 0.6V. R TA
in Figure 4 will be equal to the R FB for coincident tracking.
The TRACK/SS pin of the master can be controlled by an
external ramp or the soft-start function of that regulator
can be used to develop that master ramp. The LTM4627 can
be used as a master by setting the ramp rate on its track
pin using a soft-start capacitor. A 1.2μA current source
is used to charge the soft-start capacitor. The following
equation can be used:
? C SS ?
? 1.2μA ? ?
Ratiometric tracking can be achieved by a few simple
calculations and the slew rate value applied to the master’s
TRACK/SS pin. As mentioned above, the TRACK/SS pin
has a control range from 0V to 0.6V. The master’s TRACK/
SS pin slew rate is directly equal to the master’s output
slew rate in volts/time. The equation:
MR
SR
where MR is the master’s output slew rate and SR is the
slave’s output slew rate in volts/time. When coincident
tracking is desired, then MR and SR are equal, thus R TB
is equal to 60.4k. R TA is derived from equation:
0.6V
V FB V V
60.4k R FB R TB
where V FB is the feedback voltage reference of the regula-
tor, and V TRACK is 0.6V. Since R TB is equal to the 60.4k
V IN 6V
TO 16V
C7
22μF
16V
C9
22μF
16V
C10
22μF
16V
R2
10k
SOFT-START
CAPACITOR
C SS
150pF
R4
100k
V IN EXTV CC INTV CC PGOOD
COMP V OUT
TRACK/SS V OUT_LCL
LTM4627
RUN DIFF_OUT
f SET V OSNS+
MODE_PLLIN V OSNS–
+
82pF
C8
470μF
6.3V
C11
100μF
6.3V
V OUT2
1.5V AT 15A
SGND
GND
V FB
R FB1
40.2k
60.4k
V IN 6V
TO 16V
C3
22μF
16V
C1
22μF
16V
C2
22μF
16V
R1
10k
MASTER RAMP
OR OUTPUT 150pF
R TA R TB
60.4k
V IN EXTV CC INTV CC PGOOD
COMP V OUT
TRACK/SS V OUT_LCL
LTM4627
RUN DIFF_OUT
+
C4
470μF
6.3V
C6
100μF
6.3V
V OUT1
1.2V
15A
R3
100k
f SET
MODE_PLLIN
V OSNS+
V OSNS–
82pF
SGND
GND
V FB
R FB
60.4k
4627 F04
Figure 4. Dual Outputs (1.5V and 1.2V) with Coincident Tracking
4627fc
For more information www.linear.com/LTM4627
15
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