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Data Sheet
COINCIDENT TRACKING
The most common application is coincident tracking, used in
core vs. I/O voltage sequencing and similar applications.
Coincident tracking limits the slave output voltage to be the
same as the master voltage until it reaches regulation. Connect
the slave TRK input to a resistor divider from the master voltage
that is the same as the divider used on the slave FB pin. This
forces the slave voltage to be the same as the master voltage.
For coincident tracking, use R TRKT = R TOP and R TRKB = R BOT ,
where R TOP and R BOT are the values chosen in the Compensating
MASTER VOLTAGE
SLAVE VOLTAGE
ADP1829
For ratiometric tracking, the simplest configuration is to tie the
TRK pin of the slave channel to the FB pin of the master channel.
This has the advantage of having the fewest components, but
the accuracy suffers as the TRK pin voltage becomes equal to
the internal reference voltage and an offset is imposed on the
error amplifier of about ?18 mV at room temperature.
A more accurate solution is to provide a divider from the
master voltage that sets the TRK pin voltage to be something
lower than 0.6 V at regulation, for example, 0.5 V. The slave
channel can be viewed as having a 0.5 V external reference
supplied by the master voltage.
Once this is complete, the FB divider for the slave voltage is
Regulator section, except to substitute the 0.5 V reference for
the V FB voltage. The ratio of the slave output voltage to the
master voltage is a function of the two dividers.
? 1 ?
?
? 1 ?
?
?
?
TIME
Figure 31. Coincident Tracking
As the master voltage rises, the slave voltage rises identically.
Eventually, the slave voltage reaches its regulation voltage,
where the internal reference takes over the regulation while the
V OUT
V MASTER
?
?
?
?
?
R TOP ?
R BOT ?
R TRKT ? ?
R TRKB ? ?
(52)
TRK input continues to increase and thus removes itself from
influencing the output voltage. To ensure that the output voltage
accuracy is not compromised by the TRK pin being too close in
voltage to the 0.6 V reference, make sure that the final value of
the master voltage is greater than the slave regulation voltage by
at least 10%, or 60 mV, as seen at the FB node, and the higher,
the better. A difference of 60 mV between TRK and the 0.6 V
reference produces about 3 mV of offset in the error amplifier,
or 0.5%, at room temperature, while 100 mV between them
produces only 0.6 mV or 0.1% offset.
RATIOMETRIC TRACKING
Ratiometric tracking limits the output voltage to a fraction of
the master voltage. For example, the termination voltage for
DDR memories, VTT, is set to half the VDD voltage.
MASTER VOLTAGE
Another option is to add another tap to the divider for the
master voltage. Split the R BOT resistor of the master voltage into
two pieces, with the new tap at 0.5 V when the master voltage is
in regulation. This saves one resistor, but be aware that Type III
compensation on the master voltage causes the feedforward
signal of the master voltage to appear at the TRK input of the
slave channel.
By selecting the resistor values in the divider carefully, Equation 52
shows that the slave voltage output can be made to have a faster
ramp rate than that of the master voltage by setting the TRK
voltage at the slave larger than 0.6 V and R TRKB greater than
R TRKT . Make sure that the master SS period is long enough (that
is, sufficiently large SS capacitor) such that the input inrush
current does not run into the current limit of the power supply
during startup.
SLAVE VOLTAGE
TIME
Figure 32. Ratiometric Tracking
Rev. C | Page 23 of 28
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