LTC3589 datasheet(13/36 Pages) LINER

13 / 36 page

LTC3375

3375fa

For more information www.linear.com/3375

pin FuncTions

internal 2MHz oscillator will be used. Do not float.

ON (Pin 20): Open-Drain Output. When the PB pin is

pressed and released, the signal is debounced and the

ON signal is held HIGH for a minimum time period that

is scaled by the CT capacitor. ON is forced low if: a) KILL

is not driven high (by µP) within 10 seconds of the initial

valid PB power turn-on event, b) KILL is driven low during

normal operation, c) PB is pressed and held low for 10

seconds during normal operation, d) a RESET_ALL I2C

command is written. This pin can connect directly to a

DC/DC converter enable pin that provides an internal pull-

up. Otherwise a pull-up resistor to an external supply is

required.AllassociatedtimesarescaledbytheCTcapacitor.

PB (Pin 21): Pushbutton Input. Active low. PB is internally

pulled to VCC through a 420k (typical) resistor.

KILL (Pin 22): Kill Input Pin. Forcing KILL low releases

the ON output which in turn is forced low. While KILL is

low, the buck converters will be forced to power down and

will remain powered down for 1 second (scaled by the CT

capacitor) after KILL returns high. During system turn-

on, this pin is blanked by a 10 second (scaled by the CT

capacitor) (tKILLH) to allow the system to pull KILL high.

If unused, connect to VCC.

EN6 (Pin 23): Buck Regulator 6 Enable Input. Active high.

EN5 (Pin 24): Buck Regulator 5 Enable Input. Active high.

FB5 (Pin 25): Buck Regulator 5 Feedback Pin. Receives

feedbackbyaresistordividerconnectedacrosstheoutput.

Connecting FB5 to VIN5 combines buck regulator 5 with

buck regulator 4 for higher current. Up to 4 converters

may be combined in this way.

VIN5 (Pin 26): Buck Regulator 5 Input Supply. Bypass

to GND with a 10µF or larger ceramic capacitor. May be

drivenbyanindependentsupplyormustbeshortedtoVIN4

when buck regulator 5 is combined with buck regulator 4

for higher current.

SW5 (Pin 27): Buck Regulator 5 Switch Node. External

inductor connects to this pin.

SW6 (Pin 28): Buck Regulator 6 Switch Node. External

inductor connects to this pin.

VIN6 (Pin 29): Buck Regulator 6 Input Supply. Bypass

to GND with a 10µF or larger ceramic capacitor. May be

drivenbyanindependentsupplyormustbeshortedtoVIN5

when buck regulator 6 is combined with buck regulator 5

for higher current.

FB6 (Pin 30): Buck Regulator 6 Feedback Pin. Receives

feedbackbyaresistordividerconnectedacrosstheoutput.

Connecting FB6 to VIN6 combines buck regulator 6 with

buck regulator 5 for higher current. Up to 4 converters

may be combined in this way.

FB7 (Pin 31): Buck Regulator 7 Feedback Pin. Receives

feedbackbyaresistordividerconnectedacrosstheoutput.

Connecting FB7 to VIN7 combines buck regulator 7 with

buck regulator 6 for higher current. Up to 4 converters

may be combined in this way.

VIN7 (Pin 32): Buck Regulator 7 Input Supply. Bypass

to GND with a 10µF or larger ceramic capacitor. May be

drivenbyanindependentsupplyormustbeshortedtoVIN6

when buck regulator 7 is combined with buck regulator 6

for higher current.

SW7 (Pin 33): Buck Regulator 7 Switch Node. External

inductor connects to this pin.

SW8 (Pin 34): Buck Regulator 8 Switch Node. External

inductor connects to this pin.

VIN8 (Pin 35): Buck Regulator 8 Input Supply. Bypass

to GND with a 10µF or larger ceramic capacitor. May be

drivenbyanindependentsupplyormustbeshortedtoVIN7

when buck regulator 8 is combined with buck regulator 7

for higher current.

FB8 (Pin 36): Buck Regulator 8 Feedback Pin. Receives

feedbackbyaresistordividerconnectedacrosstheoutput.

Connecting FB8 to VIN8 combines buck regulator 8 with

buck regulator 7 for higher current. Up to 4 converters

may be combined in this way.

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