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PDF LTM8033 Data sheet ( Hoja de datos )
| Número de pieza | LTM8033 | |
| Descripción | 3A DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n Complete Step-Down Switch Mode Power Supply
n Wide Input Voltage Range: 3.6V to 36V
n 3A Output Current
n 0.8V to 24V Output Voltage
n EN55022 Class B Compliant
n Current Share Multiple LTM8033 Regulators for
More Than 3A Output
n Selectable Switching Frequency: 200kHz to 2.4MHz
n Current Mode Control
n (e4) RoHS Compliant Package with Gold Pad Finish
n Programmable Soft-Start
n Compact Package (11.25mm × 15mm × 4.32mm)
Surface Mount LGA
APPLICATIONS
n Automotive Battery Regulation
n Power for Portable Products
n Distributed Supply Regulation
n Industrial Supplies
n Wall Transformer Regulation
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LTM8033
Ultralow Noise EMC 36VIN,
3A DC/DC µModule
Regulator
DESCRIPTION
The LTM®8033 is an electromagnetic compatible (EMC)
36V, 3A DC/DC μModule® buck converter designed to
meet the radiated emissions requirements of EN55022.
Conducted emission requirements can be met by adding
standard filter components. Included in the package are the
switching controller, power switches, inductor, filters and
all support components. Operating over an input voltage
range of 3.6V to 36V, the LTM8033 supports an output
voltage range of 0.8V to 24V, and a switching frequency
range of 200kHz to 2.4MHz, each set by a single resistor.
Only the bulk input and output filter capacitors are needed
to finish the design.
The LTM8033 is packaged in a thermally enhanced, com-
pact (11.25mm × 15mm × 4.32mm) overmolded land grid
array (LGA) package suitable for automated assembly by
standard surface mount equipment.
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
Ultralow Noise 12V/3A DC/DC μModule Regulator
VIN*
20V TO 36V
2.2μF
1μF
LTM8033
VIN VOUT
RUN/SS
AUX
FIN BIAS
SHARE
PGOOD
RT SYNC GND ADJ
41.2k
34.8k
VOUT
12V
3A
47μF
f = 850kHz
8033 TA01a
* RUNNING VOLTAGE RANGE. PLEASE REFER TO THE
APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS.
EMI Performance
80
70
60
50
40
30
20
10
0
30 226.2 422.4 618.6 814.8 1010
128.1 324.3 520.5 716.7 912.9
FREQUENCY (MHz)
8033 TA01b
8033f
1
1 page  
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LTM8033
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Input Current vs Input Voltage
Output Shorted
1000
900
800
700
600
500
400
300
200
100
0
0 10 20 30 40
INPUT VOLTAGE (V)
8033 G13
Input Current vs Output Current
5VOUT
1600
1400
1200
1000
800
12VIN
600 24VIN
400
36VIN
200
0
0 500 1000 1500 2000 2500 3000
OUTPUT CURRENT (mA)
8033 G16
Input Current vs Output Current
18VOUT
1800
1600
1400
1200
1000
36VIN
800
600
400
200
0
0 500 1000 1500 2000 2500 3000
OUTPUT CURRENT (mA)
8033 G19
Input Current vs Output Current
2.5VOUT
2500
2000
1500
1000
500
0
0
5VIN
12VIN
24VIN
36VIN
500 1000 1500 2000 2500 3000
OUTPUT CURRENT (mA)
8033 G14
Input Current vs Output Current
8VOUT
2500
2000
1500
1000
500
0
0
12VIN
24VIN
36VIN
500 1000 1500 2000 2500 3000
OUTPUT CURRENT (mA)
8033 G17
Minimum Required Input Voltage
vs Output Voltage, IOUT = 3A
40
35
30
25
20
15
10
5
0
0 5 10 15
OUTPUT VOLTAGE (V)
8033 G20
Input Current vs Output Current
3.3VOUT
2500
2000
1500
5.5VIN
1000
500
0
0
12VIN
24VIN
36VIN
500 1000 1500 2000 2500 3000
OUTPUT CURRENT (mA)
8033 G15
Input Current vs Output Current
12VOUT
1800
1600
1400
1200
1000
24VIN
800
36VIN
600
400
200
0
0 500 1000 1500 2000 2500 3000
OUTPUT CURRENT (mA)
8033 G18
Minimum Required Input Voltage
vs Load Current, 2.5VOUT
4.4
4.2
TO START, WITH RUN = VIN
4.0
3.8
3.6
3.4 TO RUN OR SS
CONTROLLED START
3.2
3.0
0
500 1000 1500 2000 2500 3000
LOAD CURRENT (mA)
8033 G21
8033f
5
5 Page 
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LTM8033
APPLICATIONS INFORMATION
For most applications, the design process is straight for-
ward, summarized as follows:
• Look at Table 1 and find the row that has the desired
input range and output voltage.
• Apply the recommended CIN, CFIN, COUT, RADJ and RT
values.
• Connect BIAS as indicated.
As the integrated input EMI filter may ring in response to
an application of a step input voltage, a bulk capacitance
may be applied between FIN and GND. See the Hot-Plug-
ging Safely section for details.
While these component combinations have been tested
for proper operation, it is incumbent upon the user to
verify proper operation over the intended system’s line,
load and environmental conditions. Bear in mind that the
maximum output current is limited by junction tempera-
ture, the relationship between the input and output voltage
magnitude and polarity and other factors. Please refer to
the graphs in the Typical Performance Characteristics
section for guidance.
The maximum frequency (and attendant RT value) at
which the LTM8033 should be allowed to switch is given
in Table 1 in the fMAX column, while the recommended
frequency (and RT value) for optimal efficiency over the
given input condition is given in the fOPTIMAL column.
There are additional conditions that must be satisfied if
the synchronization function is used. Please refer to the
Synchronization section for details.
Note: An input bulk capacitance is required at either VIN
or FIN. Refer to the Typical Performance Characteristics
section for load conditions.
Capacitor Selection Considerations
The CIN, CFIN 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.
Ceramic capacitors are also piezoelectric. In Burst Mode
operation, the LTM8033’s switching frequency depends
on the load current, and can excite a ceramic capacitor
at audio frequencies, generating audible noise. Since the
LTM8033 operates at a lower current limit during Burst
Mode operation, the noise is typically very quiet to a
casual ear.
If this audible noise is unacceptable, use a high perfor-
mance electrolytic capacitor at the output. It may also be
a parallel combination of a ceramic capacitor and a low
cost electrolytic capacitor.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8033. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit.
If the LTM8033 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possibly
exceeding the device’s rating. This situation can be easily
avoided; see the Hot-Plugging Safely section.
8033f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM8033.PDF ] | |
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