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LTM8055 Arkusz danych(PDF) 9 Page - Linear Technology

Numer części LTM8055
Szczegółowy opis  36VIN, 8.5A Buck-Boost 關Module Regulator
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

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LTM8055
9
8055fb
For more information www.linear.com/LTM8055
OPERATION
The LTM8055 is a standalone nonisolated buck-boost
switching DC/DC power supply. The buck-boost topol-
ogy allows the LTM8055 to regulate its output voltage for
input voltages both above and below the magnitude of the
output. The maximum output current depends upon the
inputvoltage.Higherinputvoltagesyieldhighermaximum
output current.
This converter provides a precisely regulated output volt-
age programmable via an external resistor divider from
1.2V to 36V. The input voltage range is 5V to 36V, but the
LTM8055 may be operated at lower input voltages if SVIN
is powered by a voltage source above 5V. A simplified
block diagram is given on the previous page.
The LTM8055 contains a current mode controller, power
switching elements, power inductor and a modest amount
of input and output capacitance. The LTM8055 is a fixed
frequency PWM regulator. The switching frequency is set
by connecting the appropriate resistor value from the RT
pin to GND.
The output voltage of the LTM8055 is set by connecting
the FB pin to a resistor divider between VOUT and GND.
In addition to regulating its output voltage, the LTM8055
is equipped with average current control loops for both the
input and output. Add a current sense resistor between IIN
and VIN to limit the input current below some maximum
value. The IINMON pin reflects the current flowing though
the sense resistor between IIN and VIN.
A current sense resistor between VOUT and IOUT allows
the LTM8055 to accurately regulate its output current to
a maximum value set by the value of the sense resistor.
When the resistor is present, the IOUTMON pin reflects the
output current flowing through VOUT.
In general, the LTM8055 should be used with an output
sense resistor to limit the maximum output current, as
buck-boost regulators are capable of delivering large
currents when the output voltage is lower than the input,
if demanded.
Furthermore, while the LTM8055 does not require an
output sense resistor to operate, it uses information from
the sense resistor to optimize its performance. If an out-
put sense resistor is not used, the efficiency or output
ripple may degrade, especially if the current through the
integrated inductor is discontinuous. In some cases, an
output sense resistor is required to adequately protect the
LTM8055 against output overload or short-circuit.
A voltage less than 1.2V applied to the CTL pin reduces
the maximum output current. Drive CTL to about 50mV
to stop switching. The current flowing through the sense
resistorisreflectedbytheoutputvoltageoftheIOUTMONpin.
Driving the SYNC pin will synchronize the LTM8055 to an
external clock source. The CLKOUT pin sources a signal
that is the same frequency but approximately 180° out of
phase with the internal oscillator.
If more output current is required than a single LTM8055
can provide, multiple devices may be operated in parallel.
Refer to the Parallel Operation section of Applications
Information for more details.
Aninternalregulatorprovidespowertothecontrolcircuitry
and the gate driver to the power MOSFETs. This internal
regulator draws power from the SVIN pin. The RUN pin is
used to place the LTM8055 in shutdown, disconnecting
the output and reducing the input current to less than 1μA.
The LTM8055 is equipped with a thermal shutdown that
inhibits power switching at high junction temperatures.
The activation threshold of this function is above 125°C
to avoid interfering with normal operation, so prolonged
or repetitive operation under a condition in which the
thermal shutdown activates may damage or impair the
reliability of the device.


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