LTM4644 datasheet(9/36 Pages) LINER

9 / 36 page

LTM4650A-1

4650a1f

For more information www.linear.com/LTM4650A-1

PIN FUNCTIONS

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-

nectedNPNtransistorconnectedbetweenTEMPandSGND

pins. 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.

Heat Sink (Top Exposed Metal): The top exposed metal

is electrically unconnected.

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

LTM4644 Datasheet(PDF) 9 Page - Linear Technology

LTM4644 Datasheet(HTML) 9 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 29 30 31 32 33 34 35 36

Datasheet Download

Link URL