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LTM8056 Scheda tecnica(PDF) 10 Page - Linear Technology

Il numero della parte LTM8056
Spiegazioni elettronici  58VIN, 48VOUT Buck-Boost 關Module Regulator
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

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LTM8056
10
8056fa
For more information www.linear.com/LTM8056
OPERATION
The LTM8056 is a standalone nonisolated buck-boost
switching DC/DC power supply. The buck-boost topol-
ogy allows the LTM8056 to regulate its output voltage
for input voltages both above and below the magnitude
of the output, and the maximum output current depends
upon the input voltage. Higher input voltages yield higher
maximum output current.
This converter provides a precisely regulated output volt-
age programmable via an external resistor divider from
1.2V to 48V. The input voltage range is 5V to 58V, but the
LTM8056 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 LTM8056 contains a current mode controller, power
switching elements, power inductor and a modest amount
of input and output capacitance. The LTM8056 is a fixed
frequency PWM regulator. The switching frequency is set
by connecting the appropriate resistor value from the RT
pin to GND.
TheoutputvoltageoftheLTM8056issetbyconnectingthe
FB pin to a resistor divider between the output and GND.
In addition to regulating its output voltage, the LTM8056
is equipped with averagecurrent 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 LTM8056 to accurately regulate its output current to
a maximum value set by the value of the sense resistor.
In general, the LTM8056 should be used with an output
sense resistor to limit the maximum output current, as
buck-boost regulators are capable of delivering large cur-
rents when the output voltage is lower than the input, if
demanded.
Furthermore, while the LTM8056 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
LTM8056 against output overload or short-circuit.
A voltage less than 1.2V applied to the CTL pin reduces
the maximum output current if an output current sense
resistor is used. Drive CTL to less than about 50mV to stop
switching. The current flowing through the sense resistor
is reflected by the output voltage of the IOUTMON pin.
Driving the SYNC pin will synchronize the LTM8056 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 LTM8056
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 LTM8056 in shutdown, disconnecting
the output and reducing the input current to less than 1μA.
The LTM8056 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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