ltm4628 Linear Technology Corporation, ltm4628 Datasheet - Page 7

• Manufacturer Part Number: ltm4628
• Description: Ltm4628 - Dual 8a Or Single 16a Dc/dc ?module Regulator
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
V
output load between these pins and GND pins. Recommend
placing output decoupling capacitance directly between
these pins and GND pins. Review Table 4.
GND (A6-A7, B6-B7, D1-D4, D9-D12, E1-E4, E10-E12,
F1-F3, F10-F12, G1, G3, G10, G12, H1-H7, H9-H12, J1,
J5, J8, J12, K1, K5-K8, K12, L1, L12, M1 , M12): Power
Ground Pins for Both Input and Output Returns.
V
Apply output load between these pins and GND pins. Rec-
ommend placing output decoupling capacitance directly
between these pins and GND pins. Review Table 4.
V
of the internal top feedback resistor for each output. The
pin can be directly connected to its specific output, or
connected to DIFFOUT when the remote sense amplifier
is used. In paralleling modules, one of the V
connected to the DIFFOUT pin in remote sensing or directly
to V
connect these pins to either the DIFFOUT or V
this is the feedback path, and cannot be left open. See the
Applications Information section.
f
from this pin. A resistor from this pin to ground sets a
voltage that in turn programs the operating frequency.
Alternatively, this pin can be driven with a DC voltage
that can set the operating frequency. See the Applications
Information section.
SGND (C7, D6, G6-G7, F6-F7): Signal Ground Pin. Return
ground path for all analog and low power circuitry. Tie a
single connection to the output capacitor GND in the ap-
plication. See layout guidelines in Figure 27.
V
Amplifier for Each Channel. Internally, this pin is con-
nected to V
resistor. Different output voltages can be programmed
with an additional resistor between V
PolyPhase
for parallel operation. See the Applications Information
section for details.
SET
OUT1
OUT2
OUTS1
FB1
OUT
(C6): Frequency Set Pin. A 10μA current is sourced
, V
(A1-A5, B1-B5, C1-C4): Power Output Pins. Apply
(A8-A12, B8-B12, C9-C12): Power Output Pins.
, V
FB2
with no remote sensing. It is very important to
OUTS2
®
(D5, D7): The Negative Input of the Error
operation, tying the V
OUTS1
(C5, C8): This pin is connected to the top
or V
OUTS2
(Recommended to Use Test Points to Monitor Signal Pin Connections.)
with a 60.4kΩ precision
FB
pins together allows
FB
and GND pins. In
OUTS
OUT
pins is
since
TRACK1, TRACK2 (E5, D8): Output Voltage Tracking Pin
and Soft-Start Inputs. Each channel has a 1.3μA pull-up
current source. When one channel is configured to be
master of the two channels, then a capacitor from this pin
to ground will set a soft-start ramp rate. The remaining
channel can be set up as the slave, and have the master’s
output applied through a voltage divider to the slave
output’s track pin. This voltage divider is equal to the
slave output’s feedback divider for coincidental tracking.
See the Applications Information section.
COMP1, COMP2 (E6, E7): Current control threshold and
error amplifier compensation point for each channel. The
current comparator threshold increases with this control
voltage. Tie the COMP pins together for parallel operation.
The device is internal compensated.
DIFFP (E8): Positive input of the remote sense amplifier.
This pin is connected to the remote sense point of the output
voltage. See the Applications Information section.
DIFFN (E9): Negative input of the remote sense amplifier.
This pin is connected to the remote sense point of the
output GND. See the Applications Information section.
MODE_PLLIN (F4): Force Continuous Mode, Burst Mode
Operation, or Pulse-Skipping Mode Selection Pin and
External Synchronization Input to Phase Detector Pin.
Connect this pin to SGND to force both channels into
force continuous mode of operation. Connect to INTV
to enable pulse-skipping mode of operation. Leaving the
pin floating will enable Burst Mode operation. A clock on
the pin will force both channels into continuous mode of
operation and synchronized to the external clock applied
to this pin.
RUN1, RUN2 (F5, F9): Run Control Pin. A voltage above
1.35V will turn on each channel in the module. A voltage
below 1.35V on the RUN pin will turn off the related chan-
nel. Each RUN pin has a 1μA pull-up current, once the
RUN pin reaches 1.2V an additional 4.5μA pull-up current
is added to this pin.
LTM4628
7
4628f
CC