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LTM4606
TYPICAL PERFORMANCE CHARACTERISTICS
V IN
10mV/DIV
Input Ripple
V OUT
2mV/DIV
Output Ripple
V IN = 5V 2μs/DIV
V OUT = 1V AT 6A
C IN = 3× 10μF, 25V CERAMIC
1× 150μF BULK
BW = 300MHz
4606 G17
V IN = 5V 2μs/DIV
V OUT = 1V AT 6A
C OUT = 2× 22μF, 6.3V CERAMIC
1× 100μF, 6.3V CERAMIC
BW = 300MHz
4606 G18
PIN FUNCTIONS
PACKAGE ROW AND COLUMN LABELING MAY VARY
AMONG μModule PRODUCTS. REVIEW EACH PACKAGE
LAYOUT CAREFULLY.
V IN (Bank 1): Power Input Pins. Apply input voltage be-
tween these pins and PGND pins. Recommend placing
input decoupling capacitance directly between V IN pins
and PGND pins.
V OUT (Bank 3): Power Output Pins. Apply output load
between these pins and PGND pins. Recommend placing
output decoupling capacitance directly between these pins
and PGND pins (see Figure 17).
PGND (Bank 2): Power Ground Pins for Both Input and
Output Returns.
V D (Pins B7, C7): Top FET Drain Pins. Add more capacitors
between V D and ground to handle the input RMS current
and reduce the input ripple further.
DRV CC (Pins C10, E11, E12): These pins normally con-
nect to INTV CC for powering the internal MOSFET drivers.
They can be biased up to 6V from an external supply with
about 50mA capability, or an external circuit as shown in
Figure 18. This improves efficiency at the higher input
voltages by reducing power dissipation in the module.
INTV CC (Pin A7): This pin is for additional decoupling of
the 5V internal regulator.
PLLIN (Pin A8): External Clock Synchronization Input to
the Phase Detector. This pin is internally terminated to
SGND with a 50k resistor. Apply a clock with high level
above 2V and below INTV CC . See the Applications Infor-
mation section.
FCB (Pin M12): Forced Continuous Input. Connect this pin
to SGND to force continuous synchronization operation at
low load, to INTV CC 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 (Pin A9): Output Voltage Tracking and Soft-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 in a standalone regulator.
Slave operation is performed by putting a resistor divider
from the master output to 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 W will
equal a value in millivolts that is a percentage of the 0.6V
reference voltage. See the Applications Information section.
To parallel LTM4606s, each requires an individual MPGM
resistor. Do not tie MPGM pins together.
4606fd
For more information www.linear.com/LTM4606
7
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