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LTM4619
APPLICATIONS INFORMATION
t SOFT-START =
V SLAVE = ? 1 +
? ? V TRACK
Soft-StartandTracking
The LTM4619 has the ability to either soft-start by itself
with a capacitor or track the output of another channel or
external supply. When one particular channel is configured
to soft-start by itself, a capacitor should be connected to
its TK/SS pin. This channel is in the shutdown state if its
RUN pin voltage is below 1.2V. Its TK/SS pin is actively
pulled to ground in this shutdown state.
Once the RUN pin voltage is above 1.2V, the channel pow-
ers up. A soft-start current of 1.3μA then starts to charge
its soft-start capacitor. Note that soft-start or tracking is
achieved not by limiting the maximum output current of
the controller but by controlling the output ramp voltage
according to the ramp rate on the TK/SS pin. Current
foldback is disabled during this phase to ensure smooth
soft-start or tracking. The soft-start or tracking range is
defined to be the voltage range from 0V to 0.8V on the
TK/SS pin. The total soft-start time can be calculated as:
0.8V ?C SS
1.3μA
Output voltage tracking can be programmed externally
using the TK/SS pin. The master channel is divided down
with an external resistor divider that is the same as the
slave channel’s feedback divider to implement coincident
tracking. The LTM4619 uses an accurate 60.4k resistor
internally for the top feedback resistor. Figure 3 shows an
example of coincident tracking. Figure 4 shows the output
voltages with coincident tracking.
? R1 ?
? R2 ?
V TRACK is the track ramp applied to the slave’s TK/SS2
pin. V TRACK has a control range of 0V to 0.8V. When the
master’s output is divided down with the same resistor
values used to set the slave’s output, then the slave will
coincident track with the master until it reaches its final
value. The master will continue to its final value from the
slave’s regulation point.
Ratiometric modes of tracking can be achieved by select-
ing different divider resistors values to change the output
tracking ratio. The master output must be greater than the
slave output for the tracking to work. Master and slave
data inputs can be used to implement the correct resistors
values for coincident or ratiometric tracking.
V IN
5.5V TO
28V
V OUT1
3.3V
C IN
C OUT1
R3
19.1k
C1
0.1μF
C2
22pF
MODE/PLLIN INTV CC
V IN FREQ/PLLFLTR
V FB1 V FB2
COMP1 COMP2
V OUT1 LTM4619 V OUT2
TK/SS1 TK/SS2
RUN1 RUN2
PGOOD EXTV CC
C3
22pF
V OUT1
R4
28k
C OUT2
V OUT2
2.5V
OUTPUT
VOLTAGE
MASTER OUTPUT
SLAVE OUTPUT
SGND
PGND
4619 F03
R1
60.4k
R2
28k
TIME
4619 F04
Figure 3. Example of Coincident Tracking
Figure 4. Coincident Tracking
4619fb
For more information www.linear.com/LTM4619
11
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