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PDF LTM8054 Data sheet ( Hoja de datos )
| Número de pieza | LTM8054 | |
| Descripción | 5.4A Buck-Boost uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8054 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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LTM8054
36VIN, 5.4A Buck-Boost
µModule Regulator
Features
nn Complete Buck-Boost Switch Mode Power Supply
nn Wide Input Voltage Range: 5V to 36V
nn Wide Output Voltage Range: 1.2V to 36V
nn VIN May Be Greater than, Equal to or Less than VOUT
nn 12V/1.8A Output from 6VIN
nn 12V/3.4A Output from 12VIN
nn 12V/5.4A Output from 24VIN
nn Up to 94% Efficient
nn Adjustable Input and Output Average Current Limits
nn Input and Output Current Monitors
nn Parallelable for Increased Output Current
nn Selectable Switching Frequency: 100kHz to 800kHz
nn Synchronization from 200kHz to 700kHz
nn 11.25mm × 15mm × 3.42mm BGA Package
Applications
nn High Power Battery-Operated Devices
nn Industrial Control
nn Solar Powered Voltage Regulator
nn Solar Powered Battery Charging
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.
Description
The LTM®8054 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 LTM8054 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 LTM8054 is housed in a compact overmolded ball
grid array (BGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8054 is
RoHS compliant.
Buck Boost Selection Table
LTM8054
VIN (Operation)
VIN Abs Max
VOUT Abs Max
2IO4UVTIN(P, 1ea2kV)OUT
Package
36
40
40
5.4
15 x 11.25mm x
3.42mm BGA
LTM8055
36
40
40
8.5
15 x 15mm x
4.92mm BGA
LTM8056
58
60
60
5.5
15 x 15mm x
4.92mm BGA
Typical Application
12VOUT from 5V to 35VIN Buck Boost Regulator
Maximum Output Current and Efficiency vs Input Voltage
92 6
VIN
6V TO 35V
4.7µF
50V
×2
36.5k
600kHz
VIN
IIN
SVIN
LTM8054
RUN
CTL
SS
SYNC
COMP
RT LL MODE
GND
VOUT
IOUT
CLKOUT
IINMON
IOUTMON
FB
VOUT
12V
100k
11.0k
22µF
25V
68µF
8054 TA01a
90 4
88 2
EFFICIENCY
MAX CURRENT
86 0
0 10 20 30 40
INPUT VOLTAGE (V)
8054 TA01b
For more information www.linear.com/LTM8054
8054f
1
1 page  
LTM8054
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Input Current vs Output Current
(8VOUT)
5
Input Current vs Output Current
(12VOUT)
5
Input Current vs Output Current
(18VOUT)
5
44
4
33
3
2
1 6VIN
12VIN
0 24VIN
0123456
OUTPUT CURRENT (A)
8054 G10
Input Current vs Output Current
(24VOUT)
5
2
1
6VIN
12VIN
24VIN
35VIN
0
0123456
OUTPUT CURRENT (A)
8054 G11
Input Current vs Output Current
(36VOUT)
4
2
1
6VIN
12VIN
24VIN
36VIN
0
0123456
OUTPUT CURRENT (A)
8054 G12
Maximum Output Current vs Input
Voltage (3.3VOUT, 5VOUT, 8VOUT)
6
4
3
2
1
6VIN
12VIN
24VIN
36VIN
0
0123456
OUTPUT CURRENT (A)
8054 G13
3
2
1 6VIN
12VIN
24VIN
36VIN
0
01234
OUTPUT CURRENT (A)
8054 G14
5
4
3
3.3VOUT
5VOUT
8VOUT
2
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
8054 G15
Maximum Output Current vs Input Voltage
(12VOUT, 18VOUT, 24VOUT, 36VOUT)
6
5
4
3
2
12VOUT
1
18VOUT
24VOUT
36VOUT
0
0 6 12 18 24 30 36
INPUT VOLTAGE (V)
8054 G16
Junction Temperature Rise
vs Output Current (3.3VOUT)
70
60
50
40
30
20
10
6VIN
12VIN
19VIN
0
0123456
OUTPUT CURRENT (A)
8054 G17
Junction Temperature Rise
vs Output Current (5VOUT)
100
90
80
70
60
50
40
30
20 6VIN
10
12VIN
19VIN
0
0123456
OUTPUT CURRENT (A)
8054 G18
For more information www.linear.com/LTM8054
8054f
5
5 Page 
LTM8054
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 LTM8054. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (underdamped) tank circuit.
If the LTM8054 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 LTM8054 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 resultant
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 20.5
An external resistor from RT to GND is required. Do
not leave this pin open, even when synchronizing to an
external clock. When synchronizing the switching of the
LTM8054 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
LTM8054 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
LTM8054 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.
For more information www.linear.com/LTM8054
8054f
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LTM8054.PDF ] | |
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