LTM4628 datasheet(8/36 Pages) LINER

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LTM4650-1

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pin FuncTions

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 INTVCC

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

1.25V will turn on each channel in the module. A voltage

below 1.25V 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.

DIFFOUT (F8): Internal Remote Sense Amplifier Output.

Connect this pin to VOUTS1 or VOUTS2 depending on which

output is using remote sense. In parallel operation con-

nect one of the VOUTS pin to DIFFOUT for remote sensing.

SW1, SW2 (G2, G11): Switching node of each channel

that is used for testing purposes. Also an R-C snubber

network can be applied to reduce or eliminate switch node

ringing, or otherwise leave floating. See the Applications

Information section.

PHASMD(G4):ConnectthispintoSGND,INTVCC,orfloat-

ing this pin to select the phase of CLKOUT to 60 degrees,

120 degrees, and 90 degrees respectively.

CLKOUT (G5): Clock output with phase control using the

PHASMD pin to enable multiphase operation between

devices. See the Applications Information section.

PGOOD1, PGOOD2 (G9, G8): Output Voltage Power

Good Indicator. Open drain logic output that is pulled to

ground when the output voltage is not within ±10% of

the regulation point.

INTVCC (H8): Internal 5V Regulator Output. The control

circuits and internal gate drivers are powered from this

voltage. Decouple this pin to PGND with a 4.7µF low ESR

tantalumorceramic.INTVCCisactivatedwheneitherRUN1

or RUN2 is activated.

TEMP (J6): Temperature Monitor. An internal diode con-

nected NPN transistor between this pin and SGND with

10nF filtering capacitor. See the Applications Information

section.

EXTVCC (J7): External power input that is enabled through

a switch to INTVCCwhenever EXTVCC is greater than 4.7V.

Do not exceed 6V on this input, and connect this pin to

VIN when operating VIN on 5V. An efficiency increase will

occur that is a function of the (VIN – INTVCC) multiplied by

powerMOSFETdrivercurrent.Typicalcurrentrequirement

is 30mA. VIN must be applied before EXTVCC, and EXTVCC

must be removed before VIN.

VIN (M2-M11, L2-L11, J2-J4, J9-J11, K2-K4, K9-K11):

Power Input Pins. Apply input voltage between these pins

and GND pins. Recommend placing input decoupling

capacitance directly between VIN pins and GND pins.

(Recommended to Use Test Points to Monitor Signal Pin Connections.)

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