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LTC3388-3 Datasheet(PDF) 11 Page - Linear Integrated Systems

Part # LTC3388-3
Description  18V Dual Input Micropower PowerPath Prioritizer with Backup Supply Monitoring
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Manufacturer  LINEAR [Linear Integrated Systems]
Direct Link  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

LTC3388-3 Datasheet(HTML) 11 Page - Linear Integrated Systems

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LTC4420
11
4420f
For more information www.linear.com/LTC4420
applicaTions inForMaTion
In order to limit output rising slew rate dVOUT/dt, size:
COUT
ILIM
dVOUT
dt
(9)
as the LTC4420 limits OUT charging current to ILIM until
OUT approaches the input supply to within ILIM • RON,
where RON is the channel switch resistance. Refer to the
Thermal Protection and Maximum COUT section to deter-
mine maximum allowed COUT.
Inductive Effects
Parasitic inductance and resistance can impact circuit
performancebycausingovershootandundershootofinput
and output voltages when the LTC4420 turns off. Parasitic
inductance in the power path causes positive-going
overshoot on the input and a negative-going undershoot
on the output. Another cause of positive input overshoot is
R-L-Ctankringingduringhotplugofaninputsupply.Input
overshoot is most pronounced when the total resistance
of the input tank is low. Care must be taken to ensure over
voltage transients do not exceed the Absolute Maximum
ratings of the LTC4420. Additionally, parasitic resistance
and inductance can cause input undershoot (droop)
during power path turn on. If severe enough, undershoot
can temporarily invalidate a supply and cause repeated
power up cycles (motorboating) or unwanted switchover
between sources.
The first step to avoid these issues is to minimize parasitic
inductance and resistance in the power path. Guidelines
are given in the layout section for minimizing parasitic
inductance on the printed circuit board (PCB). External
to the PCB, twist the power and ground wires together to
minimize inductance.
Second, use a bypass capacitor at the input to limit input
voltage overshoot during LTC4420 power path turn off. A
few micro farads is sufficient for most applications. When
hot plugging supplies with large parasitic inductances, it
is possible for the R-L-C tank to ring to more than twice
the nominal supply voltage. Wall adapters and batteries
typicallyhaveenoughloss(i.e.seriesresistance)toprevent
ringing of this magnitude. However, if this is a problem,
snub input capacitor CSN1 with resistor RSN1, typically
0.5Ω. Place this network close to the supply pin.
Third, if an input capacitor is not permissible, use a TVS
(such as SMAJ16CA) in applications when supply pin
transients can exceed 24V. Use a bidirectional TVS in
applications requiring reverse input protection. Note that
a TVS does not address droop and motorboating, which
are solved only by input bypassing.
During normal operation, the LTC4420 limits power path
current to < 1.6A and internal circuitry prevents OUT from
ringing below ground during power path turn off. This is
also true for output shorts when the short is close to the
LTC4420’s OUT pin. However, if the output is shorted
through a long wire, current in the wire inductance (LPAR2
in Figure 3) builds up due to the discharge of COUT1 and
can be much higher than 1.6A. This current causes the
OUT pin to ring below its −0.3V absolute maximum rating
once COUT1 has been fully discharged. For this special
case, split the output capacitor between COUT1 and COUT2
and make COUT1 small. Snub COUT1 with resister RSN2 to
damp R-L-C ringing if required. Size COUT2 to obtain the
requiredtotaloutputcapacitance.Alsoaddadiodebetween
OUT and ground close to the LTC4420 to clamp negative
ringing if the OUT pin rings below –0.3V.
Figure 3. Recommended Inductive Transient Suppression Circuitry
V1
OUT
4420 F03
COUT1
1µF
D1
1N5818
CSN1
5µF
RSN1
0.5
LPAR1
OPTIONAL
LPAR2
OUT
V1
LTC4420
RSN2
1
OPTIONAL
COUT2
10µF


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