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LTM4615
APPLICATIONS INFORMATION
R FB1
? 4.99k + R FB1 ?
R FB1 ?
FaultConditions:CurrentLimitandOvertemperature
Protection
The LTM4615 has current mode control, which inher-
ently limits the cycle-by-cycle inductor current not only
in steady-state operation, but also in transient.
Along with current limiting in the event of an overload
condition, the LTM4615 has overtemperature shutdown
protection that inhibits switching operation around 150°C
for each channel.
Run Enable and Soft-Start
The RUN/SS pins provide a dual function of enable and
soft-start control for each channel. The RUN/SS pins are
used to control turn on of the LTM4615. While each enable
pin is below 0.5V, the LTM4615 will be in a low quiescent
current state. At least a 0.8V level applied to the enable
pins will turn on the LTM4615 regulators. This pin can be
used to sequence the regulator channels. 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
for each channel. An external 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:
where R SS and C SS are shown in the block diagram of
Figure 1, and the 1.8V is soft-start upper range. The soft-
start function can also be used to control the output ramp-up
time, so that another regulator can be easily tracked to it.
Output Voltage Tracking
Output voltage tracking can be programmed externally
using the TRACK pins. Either output can be tracked up
or 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 LTM4615 uses a
very accurate 4.99k resistor for the internal top feedback
resistor. Figure 2 shows an example of coincident tracking.
Equations:
? ?
TRACK1 = ? ? ? Master
? 4.99k ?
Slave = ? 1 + ? ? TRACK1
?
V IN
t SOFTSTART = In ? ? ? R SS ? C SS
? ?
? V IN – 1.8V ?
V IN 3V TO 5.5V
PGOOD1 10μF
C1
6.3V
C2
10μF
6.3V
PGOOD2
R FB1
R TA
3.32k
1V
SLAVE
1.2V
4A
C10
22μF
6.3V
C3
22μF
6.3V
C9
22μF
6.3V
C4
22μF
6.3V
R3
10k
R TB
4.99k
1.5V
L1 0.2μH*
1.2V
C12
10k 10k 10μF
*FAIR-RITE 0805 2508056007Y6
OPTIONAL FILTER
V IN1
PGOOD1
V OUT1
FB1
COMP1
TRACK1
RUN/SS1
LDO_IN
EN3
BOOST3
GND1
LTM4615
GND2
V IN2
PGOOD2
V OUT2
FB2
COMP2
TRACK2
RUN/SS2
LDO_OUT
FB3
PGOOD3
GND3
R4
10k
V IN OR A CONTROL RAMP
1V LOW NOISE AT 1A
C11
10μF
PGOOD3 R5 6.3V
R6
10k
LOW NOISE
C13
C SSEXT
R FB2
5.76k
C5
22μF
6.3V
C6
22μF
6.3V
C7
22μF
6.3V
4615 F02
MASTER
1.5V
4A
C8
22μF
6.3V
Figure 2. Dual Outputs (1.5V and 1.2V) with Tracking
12
For more information www.linear.com/LTM4615
4615fb
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