LTM4627EVPBF datasheet(7/28 Pages) LINER

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LTM4627

4627f

MODE_PLLIN (A8): Forced Continuous Mode, Burst Mode

Operation, or Pulse-Skipping Mode Selection Pin and

External Synchronization Input to Phase Detector Pin.

Connect this pin to INTVCC to enable pulse-skipping mode

of operation. Connect to ground to enable forced continuous

mode of operation. Floating this pin will enable Burst Mode

operation. A clock on this pin will enable synchronization

with forced continuous operation. See the Applications

Information section.

fSET (B12): A resistor can be applied from this pin to

ground to set the operating frequency, or a DC voltage

can be applied to set the frequency. See the Applications

Information section.

TRACK/SS (A9): Output Voltage Tracking Pin and Soft-

Start Inputs. The pin has a 1.2μA 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. 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 programmed with an additional resistor between VFB

and ground pins. In PolyPhase® operation, tying the

VFB pins together allows for parallel operation. See the

Applications Information section for details.

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.

PIN FUNCTIONS

RUN: (A10) Run Control Pin. A voltage above 1.4V will turn

on the module. A 5.1V Zener diode to ground is internal

to the module for limiting the voltage on the RUN pin to

5V, and allowing a pull-up resistor to VIN for enabling the

device. Limit current into the RUN pin to ≤ 2mA.

INTVCC: (A7, D9) Internal 5V LDO for Driving the Control

Circuitry and the Power MOSFET Drivers. Both pins are

internally connected. The 5V LDO has a 100mA current

limit.

EXTVCC (E12): External power input to an internal control

switch allows an external source greater than 4.7V, but less

than 6V to supply IC power and bypass the internal INTVCC

LDO. See the Applications Information section.

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 DIFF_OUT is connected to VOUT_LCL, and

drives the 60.4k top feedback resistor in remote sensing

applications. When the remote sense amplifier is used,

DIFF_OUT 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 ≤ 3.3V.

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 ≤ 3.3V.

DIFF_OUT: (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, MTP2, MTP3, MTP4, MTP5, MTP6, MTP7, MTP8

(A12, B11, C10, C11, C12, D10, D11, D12): Extra mount-

ing pads used for increased solder integrity strength.

Leave floating.

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