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PDF LTM8050 Data sheet ( Hoja de datos )
| Número de pieza | LTM8050 | |
| Descripción | 2A Step-Down uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM8050
58V, 2A Step-Down
µModule Regulator
FEATURES
n Wide Input Voltage Range: 3.6V to 58V
(60V Absolute Maximum)
n Up to 2A Output Current
n Parallelable for Increased Output Current
n 0.8V to 24V Output Voltage
n Adjustable Switching Frequency: 100kHz to 2.4MHz
n Configurable as an Inverter
n Current Mode Control
n Programmable Soft-Start
n 9mm × 15mm × 4.92mm BGA Package
APPLICATIONS
n Automotive Battery Regulation
n Power for Portable Products
n Distributed Supply Regulation
n Industrial Supplies
n Wall Transformer Regulation
DESCRIPTION
The LTM®8050 is a 58VIN, 2A step down µModule® (mi-
cromodule) converter. Included in the package are the
switching controller, power switches, inductor and all
support components. Operating over an input voltage
range of 3.6V to 58V, the LTM8050 supports an output
voltage range of 0.8V to 24V and a switching frequency
range of 100kHz to 2.4MHz, each set by a single resistor.
Only the bulk input and output filter capacitors are needed
to finish the design.
The LTM8050 is packaged in a 9mm × 15mm × 4.92mm
ball grid array (BGA) package suitable for automated
assembly by standard surface mount equipment. The
LTM8050 is available with SnPb (BGA) or RoHS compli-
ant terminal finish.
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.
Click to view associated TechClip Videos.
TYPICAL APPLICATION
VIN*
17V TO 58V
12VOUT, 2A µModule Regulator
4.7µF
VIN
RUN/SS
VOUT
AUX
LTM8050 BIAS
SHARE
PGOOD
57.6k
f = 600kHz
RT FB
SYNC GND
34.8k
VOUT
12V AT 2A
22µF
*RUNNING VOLTAGE RANGE. PLEASE REFER TO
APPLICATIONS INFORMATION SECTION FOR START-UP DETAILS 8050 TA01a
Efficiency vs Output Current, 12VOUT
92
VIN = 24V
90
VIN = 36V
88
VIN = 48V
86
84
82
80
0
0.5 1.0 1.5
OUTPUT CURRENT (A)
2.0
8050 TA01b
For more information www.linear.com/LTM8050
8050fb
1
1 page  
LTM8050
T YPICAL PERFORMANCE CHARACTERISTICS Operating conditions are per Table 1 and
TA = 25°C, unless otherwise noted.
Input Current vs Output Current
3.3VOUT
0.8 12VIN
0.7
24VIN
36VIN
0.6 48VIN
0.5
Input Current vs Output Current
5VOUT
1.2 12VIN
24VIN
1.0 36VIN
48VIN
0.8
Input Current vs Output Current
8VOUT
1.6 12VIN
1.4
24VIN
36VIN
1.2 48VIN
1.0
0.4 0.6 0.8
0.3 0.4 0.6
0.2 0.4
0.1 0.2 0.2
0
0 0.5 1.0 1.5 2.0
OUTPUT CURRENT (A)
8050 G10
0
0 0.5 1.0 1.5 2.0
OUTPUT CURRENT (A)
8050 G11
0
0 0.5 1.0 1.5 2.0
OUTPUT CURRENT (A)
8050 G12
Input Current vs Output Current
12VOUT
1.2 24VIN
36VIN
1.0 48VIN
0.8
0.6
0.4
0.2
0
0 0.5 1.0 1.5 2.0
OUTPUT CURRENT (A)
8050 G13
Input Current vs Output Current
18VOUT
1.2 36VIN
48VIN
1.0
0.8
0.6
0.4
0.2
0
0 0.5 1.0 1.5
OUTPUT CURRENT (A)
8050 G14
Input Current vs Output Current
24VOUT
1.4 36VIN
1.2 48VIN
1.0
0.8
0.6
0.4
0.2
0
0 0.5 1.0 1.5
OUTPUT CURRENT (A)
8050 G15
Input Current vs VIN Output
Shorted
400
RT = 215k (200kHz)
RT = 93.1k (400kHz)
RT = 57.6k (600kHz)
300 RT = 33.2k (900kHz)
200
100
0
0 20 40 60 80
INPUT VOLTAGE (V)
8050 G16
Output Current vs VIN Output
Shorted
5
4
3
2
1
RT = 215k (200kHz)
RT = 93.1k (400kHz)
RT = 57.6k (600kHz)
RT = 33.2k (900kHz)
0
0 20 40 60 80
INPUT VOLTAGE (V)
8050 G16
BIAS Current vs Output Current
2.5VOUT BIAS = 5V
16 12VIN
24VIN
36VIN
12 48VIN
8
4
0
0 0.5 1.0 1.5 2.0
OUTPUT CURRENT (A)
8050 G18
For more information www.linear.com/LTM8050
8050fb
5
5 Page 
BLOCK DIAGRAM
VIN
0.2µF
LTM8050
8.2µH
15pF
499k
1%
4.4µF
VOUT
AUX
BIAS
RUN/SS
SHARE
SYNC
CURRENT
MODE
CONTROLLER
GND RT
PGOOD
FB
8050 BD
OPERATION
The LTM8050 is a standalone nonisolated step-down
switching DC/DC power supply that can deliver up to 2A of
output current. This module provides a precisely regulated
output voltage programmable via one external resistor
from 0.8V to 24V. The input voltage range is 3.6V to 58V.
Given that the LTM8050 is a step-down converter, make
sure that the input voltage is high enough to support the
desired output voltage and load current.
As shown in the Block Diagram, the LTM8050 contains a
current mode controller, power switching element, power
inductor, power Schottky diode and a modest amount of
input and output capacitance. The LTM8050 is a fixed
frequency PWM regulator. The switching frequency is set
by simply connecting the appropriate resistor value from
the RT pin to GND.
An internal regulator provides power to the control circuitry.
The bias regulator normally draws power from the VIN
pin, but if the BIAS pin is connected to an external volt-
age higher than 2.8V, bias power will be drawn from the
external source (typically the regulated output voltage).
This improves efficiency. The RUN/SS pin is used to place
the LTM8050 in shutdown, disconnecting the output and
reducing the input current to less than 1μA.
To further optimize efficiency, the LTM8050 automatically
switches to Burst Mode® operation in light load situations.
Between bursts, all circuitry associated with controlling
the output switch is shut down reducing the input supply
current to 50μA in a typical application.
The oscillator reduces the LTM8050’s operating frequency
when the voltage at the FB pin is low. This frequency fold-
back helps to control the output current during start-up
and overload.
The LTM8050 contains a power good comparator which
trips when the FB pin is at roughly 90% of its regulated
value. The PGOOD output is an open-collector transistor
that is off when the output is in regulation, allowing an
external resistor to pull the PGOOD pin high. Power good is
valid when the LTM8050 is enabled and VIN is above 3.6V.
The LTM8050 is equipped with a thermal shutdown that
will inhibit power switching at high junction tempera-
tures. The activation threshold of this function, however,
is above 125°C to avoid interfering with normal operation.
Thus, prolonged or repetitive operation under a condition
in which the thermal shutdown activates may damage or
impair the reliability of the device.
For more information www.linear.com/LTM8050
8050fb
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM8050.PDF ] | |
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