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PDF LTM8001 Data sheet ( Hoja de datos )
| Número de pieza | LTM8001 | |
| Descripción | 5A uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n Complete Step-Down Switch Mode Power Supply
with Configurable Array of Five LDOs
n Step-Down Switching Power Supply
– Adjustable 10% Accurate Output Current Limit
–Constant-Current, Constant-Voltage Operation
– Wide Input Voltage Range: 6V to 36V
– 1.2V to 24V Output Voltage
n Configurable Output LDO Array
– Five 1.1A Parallelable Outputs
– Outputs Adjustable from 0V to 24V
– Low Output Noise: 90μVRMS (100Hz to 1MHz)
n 15mm × 15mm × 3.42mm Surface Mount
BGA Package
Applications
n FPGA, DSP, ASIC and Microprocessor Supplies
n Servers and Storage Devices
n RF Transceivers
LTM8001
36VIN, 5A µModule
Regulator with 5-Output
Configurable LDO Array
Description
The LTM®8001 is a 36VIN, 5A step-down μModule® regu-
lator with a 5-output configurable LDO array. Operating
over an input voltage range of 6V to 36V, the LTM8001
buck regulator supports an output voltage range of 1.2V
to 24V. Following the buck regulator is an array of five
1.1A linear regulators whose outputs may be connected
in parallel to accommodate a wide variety of load combi-
nations. Three of these LDOs are tied to the output of the
buck regulator, while the other two are tied together to
an undedicated input.
The low profile package (3.42mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. The LTM8001 is packaged in a
thermally enhanced, compact (15mm × 15mm) and low
profile (3.42mm) overmolded ball grid array (BGA) pack-
age suitable for automated assembly by standard surface
mount equipment. The LTM8001 is available with SnPb
(BGA) or RoHS compliant terminal finish.
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 7199560, 7321203.
Typical Application
5A Output DC/DC µModule Converter
VIN
6V TO 36V
10µF
3.3V
510k
VIN45
VIN0
RUN
BIAS123
BIAS45 LTM8001
COMP
SS
VREF
ILIM
SYNC
GND
VOUT0
LDO 1
VOUT1
SET1
STEP-DOWN
LDO 2
VOUT2
SET2
SWITCHING
REGULATOR
LDO 3
VOUT3
SET3
LDO 4
VOUT4
SET4
RT
FBO
LDO 5
VOUT5
SET5
118k 19.6k
350kHz
4.7µF
45.3k
4.7µF
54.9k
2.2µF
121k
For more information www.linear.com/LTM8001
1.8V
1A
1.2V
1A
1.1V
1.5A
0.9V
1.5A
+
470µF
100µF
8001 TA01
8001fd
1
1 page  
Typical Performance Characteristics
(TA = 25°C unless otherwise noted. Configured per Table 1, where applicable.)
Efficiency vs Output Current,
VOUT0 = 8V
100
95
90
85
80
75 VINO = 12V
VINO = 24V
70 VINO = 36V
012345
VOUT0 CURRENT (A)
8001 G04
Efficiency vs Output Current,
VOUT0 = 24V
100
95
90
85
80
0
VINO = 28V
VINO = 36V
1 2 34
VOUT0 CURRENT (A)
5
8001 G07
Input Current vs Output Current,
VOUT0 = 5V
2.5
VINO = 12V
VINO = 24V
2.0 VINO = 36V
1.5
1.0
0.5
0
01 2 345
VOUT0 CURRENT (A)
8001 G10
Efficiency vs Output Current,
VOUT0 = 12V
100
95
90
85
80
75
VINO = 24V
70 VINO = 36V
012345
VOUT0 CURRENT (A)
8001 G05
Input Current vs Output Current,
VOUT0 = 2.5V
1.5
VINO = 12V
VINO = 24V
1.2 VINO = 36V
0.9
0.6
0.3
0
01 2 345
VOUT0 CURRENT (A)
8001 G08
Input Current vs Output Current,
VOUT0 = 8V
4.0
VINO = 12V
3.5 VINO = 24V
VINO = 36V
3.0
2.5
2.0
1.5
1.0
0.5
0
0 1 2 3 45
VOUT0 CURRENT (A)
8001 G11
For more information www.linear.com/LTM8001
LTM8001
Efficiency vs Output Current,
VOUT0 = 18V
100
95
90
85
80
75
0
VINO = 28V
VINO = 36V
1 2 34
VOUT0 CURRENT (A)
5
8001 G06
Input Current vs Output Current,
VOUT0 = 3.3V
1.8 VINO = 12V
1.6 VINO = 24V
VINO = 36V
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
012345
VOUT0 CURRENT (A)
8001 G09
Input Current vs Output Current,
VOUT0 = 12V
3.0
2.5
2.0
1.5
1.0
0.5
0
0
VINO = 24V
VINO = 36V
1234
VOUT0 CURRENT (A)
5
8001 G12
8001fd
5
5 Page 
LTM8001
Operation
The LTM8001 consists of two major parts: the first is a
standalone nonisolated step-down switching DC/DC power
converter that can deliver up to 5A of output current. The
second part is an array of five parallelable 1.1A LDOs. The
DC/DC converter provides a precisely regulated output
voltage programmable via one external resistor from 1.2V
to 24V. The input voltage range is 6V to 36V. Given that it
is a step-down converter, make sure that the input volt-
age is high enough to support the desired output voltage
and load current. The linear regulator array consists of
five low drop-out regulators, of which three inputs are
dedicated to the buck converter’s output (VOUT0) and two
tie to an undedicated input (VIN45). Each individual linear
regulator may be set to a unique voltage through its SET
pin, or may be paralleled with other LDOs by tying their
respective SET and VOUT pins together.
The LTM8001 step-down switching converter utilizes fixed
frequency, average current mode control to accurately
regulate the output current. This results in a constant-
voltage, constant-current output characteristic, making
the LTM8001’s step-down regulator well suited for many
supercapacitorandbatterychargingapplications. Asshown
in the Typical Performance Characteristics, the current limit
works in both directions. The control loop will regulate the
current in the internal inductor. Once the VOUT0 output has
reached the regulation voltage determined by the resistor
from the FBO pin to ground, the voltage regulation loop will
reduce the output current and maintain the output voltage.
The ILIM input may be used to set the maximum allowable
current output of the LTM8001. The analog control range
of the ILIM pin is from 0V to 1.5V. If the ILIM pin is raised
above 1.5V, there is little or no effect.
The RUN pin functions as a precision enable for the step-
down switching converter connected to VOUT0. If all VOUT1-3
LDO inputs including BIAS are tied to VOUT0, the RUN pin
will also implicitly enable or disable these LDOs as well. If
an external power source is applied to BIAS123 alone or
in combination with VOUT0, RUN will not disable VOUT1-3.
Refer to the Applications Information section Shorted
Input Protection if VOUT0 is forced above VIN0. When the
voltage at the RUN pin is lower than 1.55V, switching is
terminated. Below the turn-on threshold, the RUN pin sinks
5.5μA. This current can be used with a resistor between
RUN and VIN0 to set hysteresis. Please refer to the UVLO
and Shutdown section in the Applications Information
for further details. During start-up, the SS pin is held low
until the part is enabled, after which the capacitor at the
soft-start pin is charged with an 11μA current source.
The LTM8001 is equipped with thermal shutdown circuitry
to protect the device during momentary overload condi-
tions. It is set above the 125°C absolute maximum internal
temperature rating to avoid interfering with normal speci-
fied operation, so internal device temperatures will exceed
the absolute maximum rating when the overtemperature
protection is active. Thus, continuous or repeated activa-
tion of the thermal shutdown may impair device reliability.
During thermal shutdown, all switching is terminated and
the SS pin is driven low.
The switching frequency is determined by a resistor at
the RT pin. The LTM8001 may also be synchronized to
an external clock through the use of the SYNC pin. Please
see the Switching Frequency Synchronization section in
the Applications Information for further details.
The VOUT1-5 linear regulators are easy to use and have
all the protection features expected in high performance
regulators. Included are short-circuit protection and safe
operating area protection, as well as thermal shutdown.
These linear regulators are especially well suited to ap-
plications needing multiple rails. Their architecture allows
their outputs to be adjusted down to zero volts. The output
voltage is set by a single resistor, handling modern low
voltage digital ICs as well as allowing easy parallel opera-
tion and simplified thermal management.
The linear regulators can be operated in two modes. One
mode has the BIAS123 and BIAS45 pins connected to the
linear regulator power input pins (VOUT0 and VIN45) which
gives a limitation of about 1.6V dropout. In the other mode,
the BIAS123 and BIAS45 pins can be tied to a voltage at
least 1.6V above their highest respective outputs. The linear
regulator power input (VOUT0 and VIN45) can then be set
to a lower voltage that meets the dropout requirement,
minimizing the power dissipation.
For more information www.linear.com/LTM8001
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11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTM8001.PDF ] | |
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