LTM4611 datasheet(8/28 Pages) LINER

8 / 28 page

LTM4611

4611f

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

increasedbyconnectingaresistorfromthispintoINTVCC,

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

togetherallowsforparalleloperation.SeetheApplications

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)CurrentControlThresholdandErrorAmplifier

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

turnoninthemodule.TheVINundervoltagelockout(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.

pin FuncTions

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 VFBwitha60.4kresistor.Theremotesense

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.

LTM4611 データシート(PDF) 8 Page - Linear Technology

LTM4611 データシート(HTML) 8 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

データシートダウンロード