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AMD Mobile Serial VID Dual-Phase
Fixed-Frequency Controller
I LOAD ( PHASE ) = LOAD
Table 6. OPTION Pin Settings
TRANSIENT-PHASE
OPTION OFFSET ENABLED
REPEAT ENABLED
I
η PH
where η PH is the total number of active phases.
V CC
OPEN
REF
GND
0
0
1
1
0
1
0
1
?
Switching frequency: This choice determines the
basic trade-off between size and efficiency. The
optimal frequency is largely a function of maximum
input voltage, due to MOSFET switching losses that
are proportional to frequency and V IN 2 . The opti-
Offset and Transient-Phase
Repeat (OPTION)
The +12.5mV offset and the transient-phase repeat fea-
tures of the MAX17009 can be selectively enabled and
disabled by the OPTION pin setting. Table 6 shows the
OPTION pin voltage levels and the features that are
enabled. See the Transient Phase Repeat section for a
detailed description of the respective features. When
the offset is enabled, setting the PSI_L bit low disables
the offset reducing power consumption in the low-
power state.
SMPS Design Procedure
Firmly establish the input voltage range and maximum
load current before choosing a switching frequency
and inductor operating point (ripple-current ratio). The
primary design trade-off lies in choosing a good switch-
ing frequency and inductor operating point, and the fol-
mum frequency is also a moving target, due to
rapid improvements in MOSFET technology that are
making higher frequencies more practical.
When selecting a switching frequency, the mini-
mum on-time at the highest input voltage and low-
est output voltage must be greater than the 185ns
(max) minimum on-time specification in the
Electrical Characteristics table:
V OUT(MIN) / V IN(MAX) x T SW > t ONMIN
A good rule is to choose a minimum on-time of at
least 200ns.
When in pulse-skipping operation SKIP_ = GND,
the minimum on-time must take into consideration
the time needed for proper skip-mode operation.
The on-time for a skip pulse must be greater than
the 185ns (max) minimum on-time specification in
the Electrical Characteristics table:
lowing four factors dictate the rest of the design:
? Input voltage range: The maximum value (V IN(MAX) )
must accommodate the worst-case high AC
t ONMIN ≤
R SENSE ( V IN ( MAX ) ? V OUT ( MIN )
LV IDLE
)
adapter voltage. The minimum value (V IN(MIN) )
must account for the lowest input voltage after
drops due to connectors, fuses, and battery selec-
tor switches. If there is a choice at all, lower input
voltages result in better efficiency.
?
Inductor operating point: This choice provides
trade-offs between size vs. efficiency and transient
response vs. output noise. Low inductor values pro-
vide better transient response and smaller physical
size, but also result in lower efficiency and higher
?
Maximum load current: There are two values to
consider. The peak load current (I LOAD(MAX) ) deter-
mines the instantaneous component stresses and fil-
tering requirements, and thus drives output capacitor
selection, inductor saturation rating, and the design
of the current-limit circuit. The continuous load cur-
rent (I LOAD ) determines the thermal stresses and
thus drives the selection of input capacitors,
MOSFETs, and other critical heat-contributing com-
ponents. Modern notebook CPUs generally exhibit
I LOAD = I LOAD(MAX) x 80%.
For multiphase systems, each phase supports a
fraction of the load, depending on the current bal-
ancing. When properly balanced, the load current
is evenly distributed among each phase:
output noise due to increased ripple current. The
minimum practical inductor value is one that causes
the circuit to operate at the edge of critical conduc-
tion (where the inductor current just touches zero
with every cycle at maximum load). Inductor values
lower than this grant no further size-reduction bene-
fit. The optimum operating point is usually found
between 20% and 50% ripple current.
Inductor Selection
By design, the AMD Mobile Serial VID application
should regard each of the MAX17009 SMPSs as inde-
pendent, single-phase regulators. The switching fre-
quency and operating point (% ripple current or LIR)
determine the inductor value as follows:
______________________________________________________________________________________
35
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