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LTM4613
APPLICATIONS INFORMATION
? 100k = R2
R1 =
+ FB – TRACK
V UVLO = A
R + R B
for the tracking to work. Figure 6 shows the coincident
output tracking.
Ratiometric tracking can be achieved by a few simple
calculations and the slew rate value applied to the master’s
TRACK pin. The TRACK pin has a control range from 0 to
0.6V. The master’s TRACK pin slew rate is directly equal to
the master’s output slew rate in Volts/Time. The equation:
MR
SR
where MR is the master’s output slew rate and SR is the
slave’s output slew rate in Volts/Time. When coincident
tracking is desired, then MR and SR are equal, thus R2 is
equal the 100k. R TA is derived from equation:
0.6V
V FB V V
100k R FB R2
where V FB is the feedback voltage reference of the regula-
tor, and V TRACK is 0.6V. Since R2 is equal to the 100k top
feedback resistor of the slave regulator in equal slew rate
or coincident tracking, then R1 is equal to R FB with V FB =
V TRACK . Therefore R2 = 100k, and R1 = 5.23k in Figure 5.
In ratiometric tracking, a different slew rate maybe desired
for the slave regulator. R2 can be solved for when SR is
slower than MR. Make sure that the slave supply slew
rate is chosen to be fast enough so that the slave output
voltage will reach it final value before the master output.
For example, MR = 1.5V/1ms, and SR = 1.2V/1ms. Then
R2 = 125k. Solve for R1 to equal to 5.18k.
Each of the TRACK pins will have the 1.5μA current source
on when a resistive divider is used to implement tracking
on that specific channel. This will impose an offset on the
TRACK pin input. Smaller values resistors with the same
ratios as the resistor values calculated from the above
equation can be used. For example, where the 100k is
used then a 10k can be used to reduce the TRACK pin
offset to a negligible value.
RUN Enable
The RUN pin is used to enable the power module. The
pin has an internal 5.1V Zener to ground. The pin can be
driven with 5V logic levels.
The RUN pin can also be used as an undervoltage lockout
(UVLO) function by connecting a resistor divider from
the input supply to the RUN pin. The equation for UVLO
threshold:
? 1.5V
R B
where R A is the top resistor, and R B is the bottom resistor.
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
The pin is the external compensation pin. The module
has already been internally compensated for most output
voltages. Linear Technology provides LTpowerCAD? for
more control loop optimization.
FCB Pin
The FCB pin determines whether the bottom MOSFET
remains on when current reverses in the inductor. Tying
this pin above its 0.6V threshold enables discontinuous
operation where the bottom MOSFET turns off when in-
ductor current reverses. FCB pin below the 0.6V threshold
forces continuous synchronous operation, allowing current
to reverse at light loads and maintaining high frequency
operation.
PLLIN Pin
The power module has a phase-locked loop comprised
of an internal voltage controlled oscillator and a phase
detector. This allows the internal top MOSFET turn-on to be
locked to the rising edge of the external clock. The external
clock frequency range must be within ±30% around the
set operating frequency. A pulse detection circuit is used
to detect a clock on the PLLIN pin to turn on the phase-
locked loop. The pulse width of the clock has to be at least
400ns. The clock high level must be above 2V and clock
4613f
15
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