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LTM4603HV
APPLICATIO S I FOR ATIO
the ramp of the internal reference and the output voltage.
The total soft-start time can be calculated as:
Run Enable
The RUN pin is used to enable the power module. The
t SOFTSTART = 0 . 8 V ? ( 0 . 6 V – V OUT ( MARGIN ) ) ?
C SS
1 . 5 μ A
pin has an internal 5.1V zener to ground. The pin can be
driven with a logic input not to exceed 5V.
When the RUN pin falls below 1.5V, then the TRACK/SS
pin is reset to allow for proper soft-start control when
the regulator is enabled again. Current foldback and force
The RUN pin can also be used as an undervoltage lock out
(UVLO) function by connecting a resistor divider from the
input supply to the RUN pin:
continuous mode are disabled during the soft-start pro-
cess. The soft-start function can also be used to control
the output ramp up time, so that another regulator can
V UVLO =
R1 + R2
R 2
? 1 . 5 V
be easily tracked to it.
Output Voltage Tracking
Output voltage tracking can be programmed externally
using the TRACK/SS 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. Figure 5
shows an example of coincident tracking. Ratiometric
modes of tracking can be achieved by selecting different
resistor values to change the output tracking ratio. The
master output must be greater than the slave output for
the tracking to work. Figure 6 shows the coincident output
tracking characteristics.
MASTER
OUTPUT
R2
Power Good
The PGOOD pin is an open-drain pin that can be used to
monitor valid output voltage regulation. This pin monitors
a ±10% window around the regulation point and tracks
with margining.
COMP Pin
This pin is the external compensation pin. The module
has already been internally compensated for most output
voltages. Table 2 is provided for most application require-
ments. A spice model will be provided for other control
loop optimization.
PLLIN
The power module has a phase-locked loop comprised of an
internal voltage controlled oscillator and a phase detector.
V IN
TRACK CONTROL
60.4k
This allows the internal top MOSFET turn-on to be locked
R1
100k
V IN
PGOOD
PLLIN TRACK/SS
V OUT
60.4k FROM
V OUT TO V FB
40.2k
SLAVE OUTPUT
MASTER OUTPUT
MPGM
RUN
V FB
MARG0
C OUT
C IN
COMP
INTV CC
DRV CC
SGND
LTM4603HV
PGND
MARG1
V OUT_LCL
DIFFV OUT
V OSNS+
V OSNS–
f SET
R SET
OUTPUT
VOLTAGE
SLAVE OUTPUT
40.2k
4603HV F05
TIME
4603HV F06
Figure 5
Figure 6
4603hvf
13
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