MAX5096/MAX5097
use typical values of V
IN
and f
SW
so that efficiency is opti-
mum for typical conditions. The switching frequency (f
SW
)
is fixed at 135kHz (MAX5096) and 330kHz (MAX5097).
f
SW
can also be varied from 120kHz to 500kHz
(MAX5096) and from 300kHz to 500kHz (MAX5097) when
synchronized to an external clock (see the Oscillator/
Synchronization Input (SYNC) section). The peak-to-peak
inductor current, which reflects the peak-to-peak output
ripple, is worst at the maximum input voltage. See the
Output Capacitor Selection section to verify that the
worst-case output ripple is acceptable. The inductor satu-
rating current (I
SAT
) is also important to avoid runaway
current during continuous output short circuit. Select an
inductor with an I
SAT
specification higher than the maxi-
mum peak current limit of 1.9A.
The Buck Mode operation determines the inductor and
output capacitor values. However, the values of the
inductor, its DCR, and the output capacitance/ESR
affect the closed-loop transfer function both in Buck
and LDO Modes. The internal compensation of the
MAX5096/MAX5097 in LDO Mode limits the values of
these external components. Make sure that the combi-
nation of output inductor, capacitor, and ESR falls with-
in the range specified in following Table 1.
Output Capacitor Selection
The allowable output voltage ripple and the maximum
deviation of the output voltage during load steps deter-
mine the output capacitance and its ESR. The output
40V, 600mA Buck Converters with Low-
Quiescent-Current Linear Regulator Mode
14 ______________________________________________________________________________________
OUTPUT CAPACITOR (C
OUT
)
22µF, ESR = 5mΩ to 20mΩ (ceramic)
47µF, ESR = 40mΩ to 150mΩ
100µF, ESR = 30mΩ to 100mΩ
22µH
470µF / ESR = 60Ω to 400mΩ
22µF, ESR = 5mΩ to 20mΩ (ceramic)
47µF / ESR = 40mΩ to 150mΩ
100µF / ESR = 30mΩ to 100mΩ
47µH
470µF / ESR = 60mΩ to 400mΩ
22µF, ESR = 5mΩ to 20mΩ (ceramic)
47µF / ESR = 40mΩ to 150mΩ
100µF / ESR = 30mΩ to 100mΩ
100µH
470µF / ESR = 60mΩ to 400mΩ
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