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LTM4604
APPLICATIONS INFORMATION
Run Enable and Soft-Start
The RUN/SS pin provides dual functions of enable and
soft-start control. The RUN/SS pin is used to control
turn on of the LTM4604. While this pin is below 0.5V, the
C IN1
10μF
6.3V
X5R OR X7R
V IN
5V
LTM4604 will be in a 7μA low quiescent current state. A
0.8V threshold will enable the LTM4604. This pin can be
used to sequence LTM4604 devices. The soft-start control
is provided by a 1M pull-up resistor (R SS ) and a 1000pF
capacitor (C SS ) as drawn in the Block Diagram. An external
C SSEXT
V IN
PGOOD V OUT
LTM4604
COMP FB
RUN/SS TRACK
GND
RAMP
CONTROL
OR V IN
R FB3
1.62k
C OUT1
22μF
6.3V 3
X5R OR
X7R
V MASTER
3.3V
4A
capacitor can be applied to the RUN/SS pin to increase the
soft-start time. A typical value is 0.01μF. The approximate
equation for soft-start is:
V IN
t SOFTSTART = ln ?
? V IN ?
? V IN – 1 . 8 V ? ?
? R SS ( C SS + C SSE X T )
C IN2
10μF
6.3V
5V
X5R OR X7R
where R SS and C SS are shown in the Block Diagram of
V IN
V SLAVE
Figure 1, 1.8V is the soft-start upper range, and C SSEXT
is the additional capacitance for further soft-start control.
The soft-start function can also be used to control the
output ramp-up time, so that another regulator can be
easily tracked. An independent ramp control signal can
PGOOD V OUT
LTM4604
COMP FB
RUN/SS TRACK
GND
R FB2
5.76k
R FB
5.76k
C OUT2
22μF
6.3V 3
X5R OR
X7R
1.5V
4A
be applied to the master ramp, otherwise, connect the
R FB1
TRACK pin to V IN to disable tracking.
Output Voltage Tracking
Output voltage tracking can be programmed externally
using the TRACK pin. The output can be tracked up and
down with another regulator. The master regulator’s output
is divided down with an external resistor divider that is the
same as the slave regulator’s feedback divider to implement
coincident tracking. The LTM4604 uses a very accurate
4.99k resistor for the top feedback resistor. Figure 2 shows
an example of coincident tracking.
4.99k
Figure 2
MASTER OUTPUT
SLAVE OUTPUT
4604 F02
V TRACK =
R FB 2
4 . 99 k + R FB 2
? V MASTER
TIME
4604 F03
V TRACK is the track ramp applied to the slave’s TRACK pin.
V TRACK applies the track reference for the slave output up
to the point of the programmed value at which V TRACK
proceeds beyond the 0.8V reference value. The V TRACK
pin must go beyond 0.8V to ensure the slave output has
reached its ?nal value. Load current must be present for
proper tracking.
10
Figure 3
4604fa
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