LTM4611 データシートの表示（PDF） - Linear Technology
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LTM4611 Datasheet PDF : 28 Pages
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LTM4611
Pin Functions
PLLFLTR/fSET: (B12) Phase-Locked Loop Lowpass Filter
for the Internal Phase Detector. LTM4611’s default switch-
ing frequency is 500kHz. Its switching frequency can be
increased by connecting a resistor from this pin to INTVCC,
or decreased by connecting a resistor from this pin to
SGND. See the Applications Information section.
VFB: (F12) The Negative Input of the Error Amplifier.
Internally, this pin is connected to VOUT_LCL with a 60.4k
precision resistor. Different output voltages can be pro-
grammed with an additional resistor between the VFB and
GND pins. In PolyPhase® operation, tying the VFB pins
together allows for parallel operation. See the Applications
Information section for details.
TRACK/SS: (A9) Output Voltage Tracking Pin and Soft-
Start Inputs. The pin has a 1.4µA pull-up current source.
A capacitor from this pin to ground will set a soft-start
ramp rate. In tracking, the regulator output can be tracked
to a different voltage. The different voltage is applied to
a voltage divider then the slave output’s track pin. This
voltage divider is equal to the slave output’s feedback
divider for coincidental tracking. Tie all TRACK/SS pins
together for parallel operation. See the Applications In-
formation section.
COMP: (A11) Current Control Threshold and Error Amplifier
Compensation Point. The current comparator threshold
increases with this control voltage. Tie all COMP pins
together for parallel operation. The device is internally
compensated.
RUN: (A10) Run Control Pin. A voltage above 1.35V will
turn on in the module. The VIN undervoltage lockout (UVLO)
of the LTM4611 must be set with resistor networks from
VIN to RUN and optionally from RUN to GND. Tie all RUN
pins together for parallel operation.
INTVCC: (A7, D9) Internal 5V LDO for Driving the Control
Circuitry and the Power MOSFET Drivers. Both pins are
internally connected.
VOUT_LCL: (L12) This pin connects to VOUT through a 1M
resistor and to VFB with a 60.4k resistor. The remote sense
amplifier output DIFFVOUT is connected to VOUT_LCL, and
drives the 60.4k top feedback resistor in remote sensing
applications. When the remote sense amplifier is used,
the DIFF_VOUT effectively eliminates the 1MΩ from VOUT
to VOUT_LCL. When the remote sense amplifier is not used,
then connect VOUT_LCL to VOUT directly.
VOSNS+: (J12) (+) Input to the Remote Sense Amplifier.
This pin connects to the output remote sense point. The
remote sense amplifier is used for VOUT ≤ 3.7V. For VOUT
> 3.7V, tie VOSNS+ to GND to rail the output of the remote
sense amplifier.
VOSNS–: (M12) (–) Input to the Remote Sense Amplifier.
This pin connects to the ground remote sense point. The
remote sense amplifier is used for VOUT ≤ 3.7 V. For VOUT >
3.7V, tie VOSNS– to INTVCC to rail the output of the remote
sense amplifier.
DIFFVOUT : (K12) Output of the Remote Sense Amplifier.
This pin connects to the VOUT_LCL pin for remote sense
applications. Otherwise float when not used.
MTP1:A12, MTP2:B11, MTP3:C10, MTP4:C11, MTP5:
C12, MTP6:D10, MTP7:D11, MTP8:D12, MTP9:E12:
Extra mounting pads used for increased solder integrity
strength. Leave electrically open circuit.
4611f
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