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LTM8052/LTM8052A
OPERATION
which the capacitor at the soft-start pin is charged with
an 11μA current source.
The LTM8052/LTM8052A is equipped with a thermal shut-
down to protect the device during momentary overload
conditions. It is set above the 125°C absolute maximum
internal temperature rating to avoid interfering with
normal specified operation, so internal device tempera-
tures will exceed the absolute maximum rating when the
APPLICATIONS INFORMATION
For most applications, the design process is straight
forward, summarized as follows:
1. Look at Table 1 and find the row that has the desired
input range and output voltage.
2. Apply the recommended C IN , C OUT , R ADJ and R T
values.
While these component combinations have been tested for
proper operation, it is incumbent upon the user to verify
proper operation over the intended system’s line, load and
environmental conditions. Bear in mind that the maximum
output current is limited by junction temperature, the
relationship between the input and output voltage mag-
nitude and polarity and other factors. Please refer to the
graphs in the Typical Performance Characteristics section
for guidance.
The maximum frequency (and attendant R T value) at which
the LTM8052/LTM8052A should be allowed to switch is
given in Table 1 in the f MAX column, while the recommended
frequency (and R T value) for optimal efficiency over the
given input condition is given in the f OPTIMAL column.
There are additional conditions that must be satisfied if
the synchronization function is used. Please refer to the
Synchronization section for details.
Capacitor Selection Considerations
The C IN and C OUT capacitor values in Table 1 are the
minimum recommended values for the associated oper-
ating conditions. Applying capacitor values below those
indicated in Table 1 is not recommended, and may result
overtemperature protection is active. So, continuous or
repeated activation of the thermal shutdown may impair
device reliability. During thermal shutdown, all switching
is terminated and the SS pin is driven low.
The switching frequency is determined by a resistor at the
RT pin. The LTM8052/LTM8052A may also be synchronized
to an external clock through the use of the SYNC pin.
in undesirable operation. Using larger values is generally
acceptable, and can yield improved dynamic response, if
necessary. Again, it is incumbent upon the user to verify
proper operation over the intended system’s line, load and
environmental conditions.
Ceramic capacitors are small, robust and have very low ESR.
However, not all ceramic capacitors are suitable. X5R and
X7R types are stable over temperature, applied voltage and
give dependable service. Other types, including Y5V and
Z5U have very large temperature and voltage coefficients
of capacitance. In an application circuit they may have only
a small fraction of their nominal capacitance resulting in
much higher output voltage ripple than expected.
Many of the output capacitances given in Table 1 specify
an electrolytic capacitor. Ceramic capacitors may also be
used in the application, but it may be necessary to use
more of them. Many high value ceramic capacitors have a
large voltage coefficient, so the actual capacitance of the
component at the desired operating voltage may be only
a fraction of the specified value. Also, the very low ESR of
ceramic capacitors may necessitate additional capacitors
for acceptable stability margin.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8052/
LTM8052A. A ceramic input capacitor combined with trace
or cable inductance forms a high Q (under damped) tank
circuit. If the LTM8052/LTM8052A circuit is plugged into a
live supply, the input voltage can ring to twice its nominal
value, possibly exceeding the device’s rating. This situa-
tion is easily avoided; see the Hot Plugging Safely section.
13
For more information www.linear.com/LTM8052
8052fc
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