LTC3569 datasheet(14/38 Pages) LINER

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LTC3675

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PIN FUNCTIONS

EN1 (Pin 1): Buck Regulator 1 Enable Input. Active high.

FB1 (Pin 2): Buck Regulator 1 Feedback Pin. Receives

feedback by a resistor divider connected across the output.

FB2 (Pin 3): Buck Regulator 2 Feedback Pin. Receives

feedback by a resistor divider connected across the output.

Connecting FB2 to VIN combines buck regulator 2 with

buck regulator 1 for higher current.

EN2 (Pin 4): Buck Regulator 2 Enable Input. Active high.

SW1 (Pin 5): Buck Regulator 1 Switch Node. External

inductor connects to this pin.

VIN (Pin 6): Buck Regulator 1 Input Supply. A 10μF decou-

pling capacitor to GND is recommended. Must be connected

to all other VIN supply pins (Pins 7, 10, 31, 34, 40).

VIN (Pin 7): Buck Regulator 2 Input Supply. A 10μF decou-

pling capacitor to GND is recommended. Must be connected

to all other VIN supply pins (Pins 6, 10, 31, 34, 40).

SW2 (Pin 8): Buck Regulator 2 Switch Node. External

inductor connects to this pin.

SW3 (Pin 9): Buck Regulator 3 Switch Node. External

inductor connects to this pin.

VIN (Pin 10): Buck Regulators 3 and 4 Input Supply. A

10μF decoupling capacitor to GND is recommended.

Must be connected to all other VIN supply pins (Pins 6,

7, 31, 34, 40).

SW4 (Pin 11): Buck Regulator 4 Switch Node. External

inductor connects to this pin.

EN3 (Pin 12): Buck Regulator 3 Enable Input. Active high.

EN4 (Pin 13): Buck Regulator 4 Enable Input. Active high.

FB4 (Pin 14): Buck Regulator 4 Feedback Pin. Receives

feedback by a resistor divider connected across the output.

Connecting FB4 to VIN combines buck regulator 4 with

buck regulator 3 for higher current.

FB3 (Pin 15): Buck Regulator 3 Feedback Pin. Receives

feedback by a resistor divider connected across the output.

Connecting FB3 to VIN combines buck regulator 3 with

buck regulator 2 for higher current.

LED_OV (Pin 16): Overvoltage Protection Pin for LED Driver.

LED1 (Pin 17): Connect a string of up to 10 LEDs to this pin.

SW7 (Pins 18, 19, 20): LED Driver Switch Node. External

inductor connects to these pins.

LED2 (Pin 21): Connect a string of up to 10 LEDs to this pin.

CT (Pin 22): Timing Capacitor Pin. A capacitor connected

to GND sets a time constant which is scaled for use by

the WAKE, RSTB and IRQB pins.

RSTB (Pin 23): Reset Pin. Open drain output. When the

regulated output voltage of any enabled switching regulator

is more than 8% below its programmed level, this pin is

driven LOW. Assertion delay is scaled by the CT capacitor.

IRQB (Pin 24): Interrupt Pin. Open drain output. When

undervoltage, overtemperature, or an unmasked error

condition is detected, this pin is driven LOW.

PBSTAT (Pin 25): Pushbutton Status Pin. Open drain

output. This pin provides a debounced and glitch free

status of the ONB pin.

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