LTC2972 datasheet(97/112 Pages) LINER

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LTC2972

2972fa

For more information www.linear.com/LTC2972

INTERCONNECT BETWEEN MULTIPLE ADI POWER

MANAGERS

Figure 32 shows how to interconnect the pins in a typical

multi-LTC2972 array.

• All VIN_SNS lines should be tied together in a star

type connection at the point where VIN is to be sensed.

This will minimize timing errors for the case where the

ON_OFF_CONFIGisconfiguredtostarttheLTC2972based

on VIN and ignore the CONTROL line and the OPERATION

command. In multi-part applications that are sensitive to

timing differences, it is recommended that the Vin_share_

enable bit of the MFR_CONFIG_ALL_LTC2972 register be

set high in order to allow SHARE_CLK to synchronize on/

off sequencing in response to the VIN_ON and VIN_OFF

thresholds.

• Connecting all AUXFAULTB lines together will allow

selected faults on any DC/DC converter’s output in

the array to shut off a common input switch.

• ALERTB is typically one line in an array of PMBus

converters. The LTC2972 allows a rich combination of

faults and warnings to be propagated to the ALERTB

pin.

• WDI/RESETB can be used to put the LTC2972 in the

power-onresetstate.PullWDI/RESETBlowforatleast

tRESETB to enter this state.

• The FAULTB lines can be connected together to create

fault dependencies. Figure 32 shows a configuration

where a fault on any FAULTB will pull all others low.

This is useful for arrays where it is desired to abort a

startup sequence in the event any channel does not

come up (see Figure 33).

• PWRGD reflects the status of the outputs that are

mapped to it by the MFR_PWRGD_EN command.

Figure 32 shows all the PWRGD pins connected to-

gether, but any combination may be used.

APPLICATIONS INFORMATION

Figure 32. Typical Connections Between Multiple ADI Power System Managers

VIN_SNS

AUXFAULTB

SDA

SCL

ALERTB

CONTROL0

WDI/RESETB

FAULTB0

SHARE_CLK

PWRGD

GND

LTC2972 #1

VIN_SNS

AUXFAULTB

SDA

SCL

ALERTB

CONTROL0

WDI/RESETB

FAULTB0

SHARE_CLK

PWRGD

GND

2972 F32

LTC2972 #n

TO VIN OF

DC/DCs

TO INPUT

SWITCH

TO HOST CONTROLLER

TO OTHER LTC POWER SYSTEM MANAGERS – 10k EQUIVALENT PULL-UP

RECOMMENDED ON EACH LINE EXCEPT SHARE_CLK (USE 5.49k)

LTC2972 Datasheet(PDF) 97 Page - Linear Technology

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