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PDF LTM8023 Data sheet ( Hoja de datos )
| Número de pieza | LTM8023 | |
| Descripción | 36V DC/DC Module | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8023 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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FEATURES
www.datasheet4u.com
n Complete Step-Down Switch Mode Power Supply
n Wide Input Voltage Range: 3.6V to 36V
n 2A Output Current
n 0.8V to 10V Output Voltage
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 Tiny, Low Profile (11.25mm × 9mm × 2.82mm)
Surface Mount LGA Package
APPLICATIONS
n Automotive Battery Regulation
n Power for Portable Products
n Distributed Supply Regulation
n Industrial Supplies
n Wall Transformer Regulation
LTM8023
2A, 36V DC/DC
µModule
DESCRIPTION
The LTM®8023 is a complete 2A, DC/DC step-down power
supply. Included in the package are the switching control-
ler, power switches, inductor, and all support components.
Operating over an input voltage range of 3.6V to 36V, the
LTM8023 supports an output voltage range of 0.8V to 10V,
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 low profile package (2.82mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation.
The LTM8023 is packaged in a thermally enhanced, compact
(11.25mm × 9mm) and low profile (2.82mm) over-molded
Land Grid Array (LGA) package suitable for automated
assembly by standard surface mount equipment. The
LTM8023 is RoHS compliant.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
μModule is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
5.5VIN to 36VIN, 3.3V/2A DC/DC μModule™ Converter
VIN*
5.5V TO 36V
2.2μF
VIN
RUN/SS
VOUT
AUX
BIAS
2.2μF
VOUT
3.3V
2A
LTM8023
PGOOD
SELECTABLE
OPERATING
FREQUENCY
RT
49.9k
ADJ
GND SYNC
8023 TA01
154k
*RUNNING VOLTAGE RANGE. PLEASE
REFER TO APPLICATIONS INFORMATION
FOR START-UP DETAILS
Efficiency and Power Loss
90 1.8
85 1.6
80 1.4
1.2
75
1.0
70
0.8
65
0.6
60 0.4
55
VIN = 12V
VOUT = 3.3V
0.2
50 f = 650 kHz 0
0.01 0.1
1
LOAD CURRENT (A)
10
8023 TA01b
8023fb
1
1 page  
LTM8023
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted
Output Short-Circuit Current vs
Input Voltage
www.dat3a2s0h0 eet4u.com
3000
2800
2600
2400
2200
2000
1800
1600
0
10 20 30
INPUT VOLTAGE (V)
40
8023 G10
BIAS Current vs Load Current
30
25
20
3.3VOUT
15 5VOUT
8VOUT
10
5
0
0
500
1000
1500
2000
LOAD CURRENT (mA)
8023 G11
Maximum Load Current vs Input
Voltage (8VOUT)
2500
2000
1500
1000
500
0
0
10 20 30
INPUT VOLTAGE (V)
25°C
40°C
85°C
40
8023 G13
Load Current vs Input Voltage
(5VOUT)
2500
Load Current vs Input Voltage
(3.3VOUT)
2500
2000
2000
1500
1500
1000
1000
500
0
0
10 20 30
INPUT VOLTAGE (V)
25°C
40°C
85°C
40
8023 G14
500
0
0
10 20 30
INPUT VOLTAGE (V)
25°C
40°C
85°C
40
8023 G15
3.3VOUT Junction Temperature
vs Load
50
45
40
35
30
25
20
15
10
5
0
0
12VIN
24VIN
36VIN
500 1000 1500 2000 2500
CURRENT (mA)
8023 G16
5VOUT Junction Temperature
vs Load
60
50
40
30
20
10
0
0
12VIN
24VIN
36VIN
500 1000 1500 2000 2500
CURRENT (mA)
8023 G17
8VOUT Junction Temperature
vs Load
80
70
60
50
40
30
20
10
0
0
16VIN
24VIN
36VIN
500 1000 1500 2000 2500
CURRENT (mA)
8023 G18
8023fb
5
5 Page 
LTM8023
APPLICATIONS INFORMATION
that paralleled modules start up together, the RUN/SS pins
may be tied together, as well. If the RUN/SS pins are not
wwwt.dieadtasthoegeet4thu.ecro,mmake sure that the same valued soft-start
capacitors are used for each module. An example of two
LTM8023 modules configured for load sharing is given in
the Typical Applications section.
Burst Mode Operation
To enhance efficiency at light loads, the LTM8023 auto-
matically switches to Burst Mode operation which keeps
the output capacitor charged to the proper voltage while
minimizing the input quiescent current. During Burst Mode
operation, the LTM8023 delivers single cycle bursts of
current to the output capacitor followed by sleep periods
where the output power is delivered to the load by the output
capacitor. In addition, VIN and BIAS quiescent currents are
reduced to typically 20μA and 50μA respectively during
the sleep time. As the load current decreases towards a no
load condition, the percentage of time that the LTM8023
operates in sleep mode increases and the average input
current is greatly reduced, resulting in higher efficiency.
Burst Mode operation is enabled by tying SYNC to GND. To
disable Burst Mode operation, tie SYNC to a stable voltage
above 0.7V. Do not leave the SYNC pin floating.
Minimum Input Voltage
The LTM8023 is a step-down converter, so a minimum
amount of headroom is required to keep the output in
regulation. In addition, the input voltage required to turn
on is higher than that required to run, and depends upon
whether the RUN/SS is used. As shown in Figure 2, it
takes only about 3.5VIN for the LTM8023 to run a 3.3V
output at light load. If RUN/SS is pulled up to VIN, it takes
5.5VIN to start. If the LTM8023 is enabled via the RUN/SS
pin, the minimum voltage to start at light loads is lower,
about 4.5V. A similar curve for 5VOUT operation is also
provided in Figure 2.
Soft-Start
The RUN/SS pin can be used to soft-start the LTM8023,
reducing the maximum input current during start-up.
6.0
5.5
5.0 TO START
4.5
RUN/SS ENABLED
4.0
3.5 TO RUN
3.0
0
500
1000
VOUT = 3.3V
TA = 25°C
f = 650kHz
1500
2000
LOAD CURRENT (mA)
7.5
7.0
6.5 TO START
6.0 RUN/SS ENABLED
5.5
5.0 TO RUN
0 500
1000
VOUT = 5V
TA = 25°C
f = 650kHz
1500
2000
LOAD CURRENT (mA)
8023 F02
Figure 2. The LTM8023 Needs More Voltage to Start Than to Run
The RUN/SS pin is driven through an external RC filter
to create a voltage ramp at this pin. Figure 3 shows the
start-up and shutdown waveforms with the soft-start
circuit. By choosing an appropriate RC time constant,
RUN
15k
0.22μF
RUN/SS
GND
IL
1A/DIV
VRUN/SS
2V/DIV
VOUT
2V/DIV
2ms/DIV
8023 F03
Figure 3. To Soft-Start the LTM8023, Add a
Resistor and Capacitor to the RUN/SS Pin
8023fb
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTM8023.PDF ] | |
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