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PDF LTM8055 Data sheet ( Hoja de datos )
| Número de pieza | LTM8055 | |
| Descripción | 8.5A Buck-Boost uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8055 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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LTM8055
36VIN, 8.5A Buck-Boost
µModule Regulator
Features
n Complete Buck-Boost Switch Mode Power Supply
n VOUT Equal, Greater, Less Than VIN
n Wide Input Voltage Range: 5V to 36V
n 12V/3A Output from 6VIN
n 12V/6A Output from 12VIN
n 12V/8.5A Output from 24VIN
n Up to 97.5% Efficient
n Adjustable Input and Output Average Current Limits
n Input and Output Current Monitors
n Parallelable for Increased Output Current
n Wide Output Voltage Range: 1.2V to 36V
n Selectable Switching Frequency: 100kHz to 800kHz
n Synchronization from 200kHz to 700kHz
n 15mm × 15mm × 4.92mm BGA Package
Applications
n High Power Battery-Operated Devices
n Industrial Control
n Solar Powered Voltage Regulator
n Solar Powered Battery Charging
Description
The LTM®8055 is a 36VIN, buck-boost µModule®
(micromodule) regulator. Included in the package are the
switching controller, power switches, inductor and support
components. A resistor to set the switching frequency, a
resistor divider to set the output voltage, and input and
output capacitors are all that are needed to complete the
design. Other features such as input and output average
current regulation may be implemented with just a few
components. The LTM8055 operates over an input volt-
age range of 5V to 36V, and can regulate output voltages
between 1.2V and 36V. The SYNC input and CLKOUT
output allow easy synchronization.
The LTM8055 is housed in a compact overmolded ball
grid array (BGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8055 is
RoHS compliant.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Typical Application
VIN
5V TO 36V
12VOUT from 5VIN to 36VIN Buck-Boost Regulator
4.7µF
50V
×2
36.5k
600kHz
VIN
SVIN
IIN
LTM8055
RUN
CTL
SS
SYNC
COMP
RT LL MODE
GND
VOUT
IOUT
CLKOUT
IINMON
IOUTMON
FB
VOUT
12V
100k
68µF
11.0k
22µF
25V
8055 TA01a
Maximum Output Current and
Efficiency vs VIN
10
EFFICIENCY
8
OUTPUT
CURRENT
6
98
96
94
92
4 90
88
2
86
0 84
0 10 20 30 40
VIN (V)
8055 TA01b
For more information www.linear.com/LTM8055
8055f
1
1 page  
LTM8055
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Input Current vs Output Current
(8VOUT)
10
5VIN
12VIN
8
24VIN
36VIN
6
Input Current vs Output Current
(12VOUT)
10
5VIN
12VIN
8
24VIN
36VIN
6
Input Current vs Output Current
(18VOUT)
10
8
6
4
2
0
0 2 4 6 8 10
OUTPUT CURRENT (A)
8055 G10
Input Current vs Output Current
(24VOUT)
10
5VIN
12VIN
8
24VIN
36VIN
6
4
2
0
0246
OUTPUT CURRENT (A)
8055 G13
Maximum Output Current vs VIN
10
8
6
4
12VOUT
2
18VOUT
24VOUT
36VOUT
0
0 10 20 30 40
VIN (V)
8055 G16
4
2
0
0 3 69
OUTPUT CURRENT (A)
8055 G11
Input Current vs Output Current
(36VOUT)
9
8
7
6
5
4
3
2 5VIN
1
12VIN
24VIN
0 36VIN
0 12345
OUTPUT CURRENT (A)
8055 G14
Temperature Rise vs Output
Current (3.3VOUT)
100
5VIN
12VIN
80
24VIN
36VIN
60
40
20
0
0 2 4 6 8 10
OUTPUT CURRENT (A)
8055 G17
4
2
5VIN
12VIN
24VIN
0 36VIN
0 2468
OUTPUT CURRENT (A)
8055 G12
Maximum Output Current vs VIN
10
8
6
3.3VOUT
5VOUT
8VOUT
4
0 10 20 30 40
VIN (V)
8055 G15
Temperature Rise vs Output
Current (5VOUT)
100
5VIN
12VIN
80
24VIN
36VIN
60
40
20
0
0 2 4 6 8 10
OUTPUT CURRENT (A)
8055 G18
For more information www.linear.com/LTM8055
8055f
5
5 Page 
LTM8055
Applications Information
Capacitor Selection Considerations
The CIN and COUT 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
in undesirable operation. Using larger values is generally
acceptable, and can yield improved dynamic response, if
it is 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 and ap-
plied voltage and give dependable service. Other types,
including Y5V and Z5U have very large temperature and
voltage coefficients of capacitance. In an application cir-
cuit they may have only a small fraction of their nominal
capacitance resulting in much higher output voltage ripple
than expected.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8055. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (underdamped) tank circuit.
If the LTM8055 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possi-
bly exceeding the device’s rating. This situation is easily
avoided; see the Hot-Plugging Safely section.
Frequency Selection
The LTM8055 uses a constant frequency PWM architec-
ture that can be programmed to switch from 100kHz to
800kHz by tying a resistor from the RT pin to ground.
Table 3 provides a list of RT resistor values and their re-
sultant frequencies.
Table 3. Switching Frequency vs RT Value
FREQUENCY
RT VALUE (kΩ)
100 453
200 147
300 84.5
400 59
500 45.3
600 36.5
700 29.4
800 24.9
An external resistor from RT to GND is required. Do not
leave this pin open, even when synchronizing to an ex-
ternal clock. When synchronizing the switching of the
LTM8055 to an external signal source, the frequency range
is 200kHz to 700kHz.
Operating Frequency Trade-Offs
It is recommended that the user apply the optimal RT
value given in Table 1 for the input and output operating
condition. System level or other considerations, however,
may necessitate another operating frequency. While the
LTM8055 is flexible enough to accommodate a wide range
of operating frequencies, a haphazardly chosen one may
result in undesirable operation under certain operating or
fault conditions. A frequency that is too high can reduce
efficiency, generate excessive heat or even damage the
LTM8055 if the output is overloaded or short circuited.
A frequency that is too low can result in a final design
that has too much output ripple, too large of an output
capacitor or is unstable.
Parallel Operation
Two or more LTM8055s may be combined to provide
increased output current by configuring them as a mas-
ter and a slave, as shown in Figure 1. Each LTM8055 is
equipped with an IOUTMON and a CTL pin. The IOUTMON
pin’s 0 to 1.2V signal reflects the current passing through
the output sense resistor, while a voltage less than 1.2V
applied to the CTL pin will limit the current passing through
the output sense resistor. By applying the voltage of the
master’s IOUTMON pin to the slave’s CTL pin, the two units
For more information www.linear.com/LTM8055
8055f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM8055.PDF ] | |
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