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LTM4605
APPLICATIONS INFORMATION
To set the output voltage at 12V, the resistor R FB from V FB
pin to ground should be chosen as:
Consider the safety margin about 30%, we can choose
the sensing resistor as 8m Ω .
R FB =
0.8V ? 100k
V OUT ? 0.8V
≈ 7.15k
For the input capacitor, use a low ESR sized capacitor to
handle the maximum RMS current. Input capacitors are
required to be placed adjacent to the module. In Figure 14,
To choose a proper inductor, we need to know the current
ripples at different input voltages. The inductor should
be chosen by considering the worst case in the practi-
cal operating region. If the maximum output power P is
150W at buck mode, we can get the current ripple ratio
of the current ripple Δ I L to the maximum inductor current
I L as follows:
the 10μF ceramic input capacitors are selected for their
ability to handle the large RMS current into the converter.
The 100μF bulk capacitor is only needed if the input source
impedance is compromised by long inductive leads or
traces.
For the output capacitor, the output voltage ripple and
transient requirements require low ESR capacitors. If
(V IN – V OUT ) ? V OUT
ΔI L
I L
=
V IN ? L ? f ? P
2
assuming that the ESR dominates the output ripple, the
output ripple is as follows:
Δ V OUT(P-P) = ESR ? Δ I L
Figure 3 shows the current ripple ratio at different input
voltages based on the inductor values: 1.5μH, 2.5μH,
3.3μH and 4.7μH. If we need 30% ripple current ratio at
all inputs, the 3.3μH inductor can be selected.
If a total low ESR of about 5m Ω is chosen for output
capacitors, the maximum output ripple of 17.5mV occurs
at the input voltage of 20V with the current ripple at 3.5A.
0.8
0.6
V OUT = 12V
? = 400kHz
1.5μH
Boost Mode Operation
For boost mode operation, use input voltage V IN = 5V to
12V, V OUT = 12V and f = 400kHz.
0.4
2.5μH
Set the PLLFLTR pin and R FB as in buck mode.
If the maximum output power P is 60W at boost mode
0.2
3.3μH
4.7μH
and the module ef?ciency η is about 95%, we can get
the current ripple ratio of the current ripple Δ I L to the
maximum inductor current I L as follows:
0
12 14 16 18 20
INPUT VOLTAGE V IN (V)
4605 F03
Figure 3. Current Ripple Ratio at Different Inputs for Buck Mode
Δ I L
I L
=
(V OUT ? V IN ) ? V IN2 η
V OUT ? L ? f ? P
Figure 4. shows the current ripple ratio at different input
At buck mode, sensing resistor selection is based on
the maximum output current and the allowed maximum
sensing threshold 130mV.
voltages based on the inductor values: 1.5μH, 2.5μH,
3.3μH and 4.7μH. If we need 30% ripple current ratio at
all inputs, the 3.3μH inductor can be selected.
R SENSE =
2 ? 130mV
2 ? (P / V OUT ) ? Δ I L
4605fc
14
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