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LTM8063 数据表(PDF) 15 Page - Linear Technology

部件名 LTM8063
功能描述  40VIN, 2A Silent Switcher 關Module Regulator
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTM8063 数据表(HTML) 15 Page - Linear Technology

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LTM8063
15
8063fa
For more information www.linear.com/LTM8063
APPLICATIONS INFORMATION
The internal current limit is designed to prevent damage
to the LTM8063 in the case of overload or short-circuit.
The internal temperature of the LTM8063 depends upon
operating conditions such as the ambient temperature,
the power delivered, and the heat sinking capability of
the system. For example, if the LTM8063 is configured
to regulate at 1.2V, it may continuously deliver 2.5A from
12VIN if the ambient temperature is controlled to less than
55°C. This is higher than the 2A continuous rating. Please
see the “Derating, VOUT = 1.2V” curve in the Typical Per-
formance Characteristics section. Similarly, if the output
voltage is 15V and the ambient temperature is 100°C, the
LTM8063 will deliver less than 100mA from 36VIN, which
is less than the 2A continuous rating.
Load Sharing
The LTM8063 is not designed to load share.
Burst Mode Operation
To enhance efficiency at light loads, the LTM8063 auto-
matically switches to Burst Mode operation which keeps
the output capacitor charged to the proper voltage while
minimizing the input quiescent current. During Burst
Mode operation, the LTM8063 delivers single cycle bursts
ofcurrenttotheoutputcapacitorfollowedbysleepperiods
where most of the internal circuitry is powered off and
energy is delivered to the load by the output capacitor.
During the sleep time, VIN quiescent current is greatly
reduced, so, as the load current decreases towards a no
load condition, the percentage of time that the LTM8063
operates in sleep mode increases and the average input
current is greatly reduced, resulting in higher light load
efficiency.
Burst Mode operation is enabled by tying SYNC to GND.
Minimum Input Voltage
The LTM8063 is a step-down converter, so a minimum
amount of headroom is required to keep the output in
regulation. Keep the input above 3.2V to ensure proper
operation. Voltage transients or ripple valleys that cause
the input to fall below 3.2V may turn off the LTM8063.
Output Voltage Tracking and Soft-Start
The LTM8063 allows the user to adjust its output voltage
ramp rate by means of the TR/SS pin. An internal 2μA pulls
up the TR/SS pin to about 2.4V. Putting an external capaci-
tor on TR/SS enables soft starting the output to reduce
current surges on the input supply. During the soft-start
ramp the output voltage will proportionally track the TR/
SS pin voltage. For output tracking applications, TR/SS
can be externally driven by another voltage source. From
0V to 0.77V, the TR/SS voltage will override the internal
0.77V reference input to the error amplifier, thus regulat-
ing the FB pin voltage to that of the TR/SS pin. When TR/
SS is above 0.77V, tracking is disabled and the feedback
voltage will regulate to the internal reference voltage. The
TR/SS pin may be left floating if the function is not needed.
An active pull-down circuit is connected to the TR/SS pin
which will discharge the external soft-start capacitor in
the case of fault conditions and restart the ramp when the
faults are cleared. Fault conditions that clear the soft-start
capacitor are the RUN pin transitioning low, VIN voltage
falling too low, or thermal shutdown.
Pre-Biased Output
As discussed in the Output Voltage Tracking and Soft-
Start section, the LTM8063 regulates the output to the
FB voltage determined by the TR/SS pin whenever TR/
SS is less than 0.77V. If the LTM8063 output is higher
than the target output voltage, the LTM8063 will attempt
to regulate the output to the target voltage by returning a
small amount of energy back to the input supply. If there
is nothing loading the input supply, its voltage may rise.
Take care that it does not rise so high that the input voltage
exceeds the absolute maximum rating of the LTM8063.
Frequency Foldback
The LTM8063 is equipped with frequency foldback which
actstoreducethethermalandenergystressontheinternal
power elements during a short circuit or output overload
condition. If the LTM8063 detects that the output has
fallenoutofregulation,theswitchingfrequencyisreduced
as a function of how far the output is below the target
voltage. This in turn limits the amount of energy that can


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