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參數(shù)資料
| 型號： | LTM4612MPV#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 940 kHz SWITCHING FREQ-MAX, PBGA133 |
| 封裝： | 15 X 15 MM, 2.82 MM HEIGHT, LEAD FREE, MO-222, LGA-133 |
| 文件頁數(shù)： | 24/26頁 |
| 文件大小： | 5123K |
| 代理商： | LTM4612MPV#PBF |
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LTM4612
4612fa
pin FuncTions
VIN (Bank 1): Power Input Pins. Apply input voltage be-
tween these pins and PGND pins. Recommend placing
input decoupling capacitance directly between VIN pins
and PGND pins.
PGND (Bank 2): Power Ground Pins for Both Input and
Output Returns.
VOUT (Bank 3): Power Output Pins. Apply output load
betweenthesepinsandPGNDpins.Recommendplacingout-
put decoupling capacitance directly between these pins and
GND pins (see the LTM4612 Pin Configuration below).
VD (Pins B7, C7): Top FET Drain Pins. Add more capa-
citors between VD and ground to handle the input RMS
current and reduce the input ripple further.
DRVCC (Pins C10, E11, E12): These pins normally con-
nect to INTVCC for powering the internal MOSFET drivers.
They can be biased up to 6V from an external supply with
about 50mA capability. This improves efficiency at the
higher input voltages by reducing power dissipation in
the module.
INTVCC (Pin A7): This pin is for additional decoupling of
the 5V internal regulator.
PLLIN(PinA8):ExternalClockSynchronizationInputtothe
Phase Detector. This pin is internally terminated to SGND
with a 50k resistor. Apply a clock above 2V and below
INTVCC. See the Applications Information section.
FCB (Pin M12): Forced Continuous Input. Connect this pin
to SGND to force continuous synchronization operation at
low load, to INTVCC to enable discontinuous mode opera-
tion at low load or to a resistive divider from a secondary
output when using a secondary winding.
TRACK/SS(PinA9):OutputVoltageTrackingandSoft-Start
Pin. When the module is configured as a master output,
then a soft-start capacitor is placed on this pin to ground
to control the master ramp rate. A soft-start capacitor can
be used for soft-start turn-on as a standalone regulator.
Slave operation is performed by putting a resistor divider
from the master output to the ground, and connecting the
center point of the divider to this pin. See the Applications
Information section.
MPGM (Pins A12, B11): Programmable Margining Input.
A resistor from these pins to ground sets a current that is
equal to 1.18V/R. This current multiplied by 10k will equal
a value in millivolts that is a percentage of the 0.6V refer-
ence voltage. See the Applications Information section.
To parallel LTM4612s, each requires an individual MPGM
resistor. Do not tie MPGM pins together.
fSET (Pin B12): Frequency Set Internally to 850kHz at 12V
Output. An external resistor can be placed from this pin to
ground to increase frequency. This pin can be decoupled
with a 1000pF capacitor. See the Applications Information
section for frequency adjustment.
LTM4612 Pin Configuration
(See Package Description for Pin Assignments)
MARG1
DRVCC
VFB
PGOOD
SGND
NC
FCB
VIN
BANK 1
VD
PGND
BANK 2
VOUT
BANK 3
fSET
MARG0
RUN
COMP
MPGM
PLLIN
INT
V CC
TRACK/SS
LGA PACKAGE
133-LEAD (15mm × 15mm × 2.8mm)
TOP VIEW
SGND
12
2
1
4
3
5 6
9
8
10 11
7
A
B
C
D
E
F
G
H
J
K
L
M
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