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PDF LTM8073 Data sheet ( Hoja de datos )
| Número de pieza | LTM8073 | |
| Descripción | 3A Silent Switcher uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8073 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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FEATURES
n Complete Step-Down Switch Mode Power Supply
n Low Noise Silent Switcher® Architecture
n Wide Input Voltage Range: 3.4V to 60V
n Wide Output Voltage Range: 0.8V to 15V
n 3A Continuous Output Current, 5A Peak
n Parallelable for Increased Output Current
n Selectable Switching Frequency: 200kHz to 3MHz
n Programmable Soft-Start
n 6.25mm × 9mm × 3.32mm BGA Package
APPLICATIONS
n Power for Portable Products
n Distributed Supply Regulation
n Industrial Supplies
n Wall Transformer Regulation
LTM8073
60VIN, 3A Silent Switcher
µModule Regulator
DESCRIPTION
The LTM®8073 is a 60VIN, 3A (continuous) or 5A (peak)
step-down Silent Switcher µModule® (power module) regu-
lator. Included in the package are the switching controller,
power switches, inductor, and all support components.
Operating over an input voltage range of 3.4V to 60V, the
LTM8073 supports an output voltage range of 0.8V to 15V
and a switching frequency range of 200kHz to 3MHz, each
set by a single resistor. Only the input and output filter
capacitors are needed to finish the design.
The low profile package enables utilization of unused
space on the bottom of PC boards for high density point
of load regulation. The LTM8073 is packaged in a thermally
enhanced, compact over-molded ball grid array (BGA) pack-
age suitable for automated assembly by standard surface
mount equipment. The LTM8073 is RoHS compliant.
L, LT, LTC, LTM, µModule, Burst Mode, Silent Switcher, Linear Technology and the Linear logo
are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
5VOUT from 7VIN to 60VIN Step-Down Converter
VIN
7V TO 60V
VIN
RUN
1µF
RT
32.4k
1.2MHz
LTM8073
BIAS
AUX
VOUT
GND SYNC
47.5k
FB
VOUT
5V
3A
100µF
8073 TA01a
PINS NOT USED IN THIS CIRCUIT: TR/SS, PG, SHARE
BIAESffic=ie5nVcy, VOUT = 5V, BIAS = 5V
95
VIN = 24V
90
85
80
0
For more information www.linear.com/LTM8073
12
LOAD CURRENT (A)
3
8073 TA01
8073f
1
1 page  
LTM8073
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Efficiency, VOUT = 8V, BIAS = 5V
100
Efficiency, VOUT = 12V, BIAS = 5V
100
Efficiency, VOUT = 15V, BIAS 5V
100
90 90 90
80 80 80
70 12VIN
24VIN
36VIN
48VIN
60
01234
LOAD CURRENT (A)
8073 G10
Efficiency, VOUT = –3.3V,
BIAS = 0V
90
70 24VIN
36VIN
48VIN
60
0
123
LOAD CURRENT (A)
4
8073 G11
Efficiency, VOUT = –5V, BIAS = 0V
90
70 24VIN
36VIN
48VIN
60
0
123
LOAD CURRENT (A)
4
8073 G12
Efficiency, VOUT = –8V, BIAS = 0V
90
80 80 80
70 70 70
60 12VIN
24VIN
36VIN
48VIN
50
01234
LOAD CURRENT (A)
8073 G13
Efficiency, VOUT = –12V, BIAS = 0V
90
80
70
60 12VIN
24VIN
36VIN
48VIN
50
0123
LOAD CURRENT (A)
8073 G16
60 12VIN
24VIN
36VIN
48VIN
50
01234
LOAD CURRENT (A)
8073 G14
Efficiency, VOUT = –15V, BIAS = 0V
90
80
70
60
50
0
12VIN
24VIN
36VIN
1
LOAD CURRENT (A)
2
8073 G17
For more information www.linear.com/LTM8073
60 12VIN
24VIN
36VIN
48VIN
50
0123
LOAD CURRENT (A)
8073 G15
Input vs Load Current
VOUT = 0.8V
0.75
12VIN
24VIN
36VIN
0.50 48VIN
0.25
0
012345
LOAD CURRENT (A)
8073 G18
8073f
5
5 Page 
LTM8073
PIN FUNCTIONS
GND (Bank 1, A1, A6, B3): Tie these GND pins to a
local ground plane below the LTM8073 and the circuit
components. In most applications, the bulk of the heat
flow out of the LTM8073 is through these pads, so the
printed circuit design has a large impact on the thermal
performance of the part. See the PCB Layout and Thermal
Considerations sections for more details.
VIN (Bank 2): VIN supplies current to the LTM8073’s in-
ternal regulator and to the internal power switch. These
pins must be locally bypassed with an external, low ESR
capacitor; see Table 1 for recommended values.
VOUT (Bank 3): Power Output Pins. Apply the output
filter capacitor and the output load between these pins
and GND pins.
BIAS (Pin A2): The BIAS pin connects to the internal
power bus. Connect to a power source greater than 3.2V.
If VOUT is greater than 3.2V, connect this pin to AUX.
Decouple this pin with at least 1µF if the voltage source
for BIAS is remote.
PG (Pin A3): The PG pin is the open-collector output of
an internal comparator. PG remains low until the FB pin
voltage is between 0.73V and 0.88V typical. The PG signal
is valid when VIN is above 3.4V. If VIN is above 3.4V and
RUN is low, PG will drive low. If this function is not used,
leave this pin floating.
SHARE (Pin A4): Tie this to the SHARE pin of another
LTM8073 to load share. Otherwise leave floating. Do not
drive this pin.
RT (Pin A5): The RT pin is used to program the switching
frequency of the LTM8073 by connecting a resistor from
this pin to ground. The Applications Information section
of the data sheet includes a table to determine the resis-
tance value based on the desired switching frequency.
Minimize capacitance at this pin. Do not drive this pin.
FB (Pin B1): The LTM8073 regulates its FB pin to 0.8V.
Connect the adjust resistor from this pin to ground. The
value of RFB is given by the equation RFB = 199.7/(VOUT
– 0.8), where RFB is in kΩ.
AUX (Pin B2): Low Current Voltage Source for BIAS.
In many designs, the BIAS pin is simply connected to
VOUT. The AUX pin is internally connected to VOUT and
is placed adjacent to the BIAS pin to ease printed circuit
board routing. Also, some applications require a feed-
forward capacitor; it can be connected from AUX to FB
for convenient PCB routing. Although this pin is internally
connected to VOUT, it is not intended to deliver a high
current, so do not draw current from this pin to the load.
SYNC (Pin B4): External clock synchronization input
and operational mode. This pin programs four different
operating modes: 1) Burst Mode®. Tie this pin to ground
for Burst Mode operation at low output loads—this will
result in low quiescent current. 2) Pulse-skipping mode.
Float this pin for pulse-skipping mode. This mode offers
full frequency operation down to low output loads before
pulse-skipping mode occurs. 3) Spread spectrum mode.
Tie this pin high (between 2.9V and 4.2V) for pulse-
skipping mode with spread spectrum modulation. 4)
Synchronization mode. Drive this pin with a clock source
to synchronize to an external frequency. During synchro-
nization the part will operate in pulse-skipping mode.
TR/SS (Pin B5): The TR/SS pin is used to provide a
soft-start or tracking function. The internal 2μA pull-up
current in combination with an external capacitor tied
to this pin creates a voltage ramp. If TR/SS is less than
0.8V, the FB voltage tracks to this value. For tracking, tie
a resistor divider to this pin from the tracked output. This
pin is pulled to ground with an internal MOSFET during
shutdown and fault conditions; use a series resistor if
driving from a low impedance output. This pin may be
left floating if the tracking function is not needed.
RUN (Pin B6): Pull the RUN pin below 0.9V to shut down
the LTM8073. Tie to 1.06V or more for normal opera-
tion. If the shutdown feature is not used, tie this pin to
the VIN pin.
For more information www.linear.com/LTM8073
8073f
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LTM8073.PDF ] | |
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