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LTM4604A
APPLICATIONS INFORMATION
? R SS ( C SS + C SSEXT )
= ln ?
t SOFTSTART
V IN
LTM4604A
COMP
FB
6.3V × 3
RUN/SS TRACK
X5R OR
R FB3
X7R
C SSEXT
1.62k
V IN
LTM4604A
COMP
FB
R FB X7R
RunEnableandSoft-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 LTM4604A. While this pin is below 0.5V, the
LTM4604A will be in a 7μA low quiescent current state. A
0.8V threshold will enable the LTM4604A. This pin can be
used to sequence LTM4604A devices. The voltage on the
RUN/SS pin clamps the control loop’s current comparator
threshold. A RUN/SS pin voltage of 2.375V upon completion
of soft-start guarantees the regulator can deliver full output
current. The soft-start control is provided by a 1M pull-up
resistor (R SS ) and a 1000pF capacitor (C SS ) as shown in
the Block Diagram. An external capacitor can be applied
to the RUN/SS pin to increase the soft-start time. A typical
value is 0.01μF. Soft-start time is approximately given by:
? V IN ?
? V IN – 1.8V ? ?
where R SS and C SS are shown in the Block Diagram of
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 be applied
to the master ramp, otherwise, connect the TRACK pin to
V IN to disable tracking. To turn off the module while V IN
remains active, the RUN/SS pin should be pulled low with
a falling edge ≤1μs to ensure the device does not transition
slowly through the internal undervoltage lockout threshold.
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 LTM4604A uses a
very accurate 4.99k resistor for the top feedback resistor.
Figures 2 and 3 show an example of coincident tracking.
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
V IN
5V
C IN1
10μF
6.3V
X5R OR X7R
V MASTER
PGOOD V OUT 3.3V
4A
C OUT1
22μF
RAMP
CONTROL
GND OR V IN
V IN
5V
C IN2
10μF
6.3V
X5R OR X7R
V SLAVE
PGOOD V OUT 1.5V
4A
C OUT2
22μF
6.3V × 3
RUN/SS TRACK X5R OR
GND R FB2 5.76k
5.76k
R FB1
4.99k
4604A F02
Figure 2. Dual Outputs (3.3V and 1.5V) with Tracking
MASTER OUTPUT
SLAVE OUTPUT
V TRACK
=
R FB2
4.99k + R FB2
? V MASTER
TIME 4604A F03
Figure 3. Output Voltage Coincident Tracking
11
For more information www.linear.com/LTM4604A
4604afa
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