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LTM8055 数据表(PDF) 12 Page - Linear Technology

部件名 LTM8055
功能描述  36VIN, 8.5A Buck-Boost 關Module Regulator
Download  26 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTM8055 数据表(HTML) 12 Page - Linear Technology

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LTM8055
12
8055fb
For more information www.linear.com/LTM8055
APPLICATIONS INFORMATION
will source the same current to the load, assuming each
LTM8055 output current sense resistor is the same value.
ParalleledLTM8055sshouldnormallybeallowedtoswitch
in discontinuous mode to prevent current from flowing
from the output of one unit into another; that is, the
MODE pin should be tied to LL. In some cases, operating
the master in forced continuous (MODE open) and the
slaves in discontinuous mode (MODE = LL) is desirable.
If so, current from the output can flow into the master’s
input. Please refer to Input Precaution in this section for
a discussion of this behavior.
Minimum Input Voltage and RUN
The LTM8055 needs a minimum of 5V for proper opera-
tion, but system parameters may dictate that the device
operate only above some higher input voltage. For ex-
ample, a LTM8055 may be used to produce 12VOUT, but
the input power source may not be budgeted to provide
enough current if the input supply voltage is below 8V.
The RUN pin has a typical falling voltage threshold of
1.2V and a typical hysteresis of 25mV. In addition, the
pin sinks 3µA below the RUN threshold. Based upon the
above information and the circuit shown in Figure 2, the
VIN rising (turn-on) threshold is:
VIN = 3µA •R1
(
)+1.225V
R1+R2
R2
and the VIN falling turn-off threshold is:
VIN =1.2
R1+R2
R2
RUN
LTM8055
VIN
R1
R2
8055 F02
Figure 2. This Simple Resistor Network Sets the Minimum
Operating Input Voltage Threshold with Hysteresis
Figure 1. Two or More LTM8055s May Be Connected in a
Master/Slave Configuration for Increased Output Current
The design of a master-slave configuration is straight
forward:
1. Apply the FB resistor network to the master, choosing
the proper values for the desired output voltage. Sug-
gested values for popular output voltages are provided
in Table 1.
2. Apply a FB resistor network to the individual slaves
so that the resulting output is higher than the desired
output voltage.
3. Apply the appropriate output current sense resistors
between VOUT and IOUT. If the same value is used for the
master and slave units, they will share current equally.
4. Connect the master IOUTMON to the slaves’ CTL pin
through a unity gain buffer. The unity gain buffer is
requiredtoisolatetheoutputimpedanceoftheLTM8055
from the integrated pull-up on the CTL pins.
5. Tie the outputs together.
Note that this configuration does not require the inputs to
be tied together, making it simple to power a single heavy
load from multiple input sources. Ensure that each input
power source has sufficient voltage and current sourcing
capability to provide the necessary power. Please refer
to the Maximum Output Current vs VIN and Input Current
vs Output Current curves in the Typical Performance
Characteristics section for guidance.
Minimum Input Voltage and SVIN
The minimum input voltage of the LTM8055 is 5V, but this
is only if VIN and SVIN are tied to the same voltage source.
If SVIN is powered from a power source at or above 5VDC,
VIN can be allowed to fall below 5V and the LTM8055 can
MASTER
VOUT
IOUT
OUTPUT CURRENT
SENSE RESISTOR
OUTPUT CURRENT
SENSE RESISTOR
UNITY GAIN
BUFFER
IOUTMON
CTL
VOUT
IOUT
SLAVE
TO LOAD
8055 F01


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