LTC3589 datasheet(14/50 Pages) LINER

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LTC3589/LTC3589-1/

LTC3589-2

3589fe

PIN FUNCTIONS

ON (Pin 21): Pushbutton Input. A weak internal pull-up

forces ON high when left ﬂoating. A normally open push-

button is connected from ON to ground to force a low

state on this pin.

PBSTAT (Pin 22): Pushbutton Status. Open-drain output

to be used for processor interrupts. PBSTAT mirrors the

status of ON pushbutton pin. PBSTAT is delayed 50ms

from ON pin for debounce.

WAKE (Pin 23): System Wake Up. Open-drain driver output

releases high when signaled by pushbutton activation or

PWR_ON input. It may be used to initiate a pin-strapped

power-up sequence by connecting to a regulator enable

pin to initiate a pin-strapped power-on sequence.

PVIN2 (Pin 24): Power Input for Step-Down Switching

Regulator 2. Tie this pin to VIN supply. This pin should

be bypassed to ground with a 4.7μF or greater ceramic

capacitor.

SW2 (Pin 25): Switch Pin for Step-Down Switching Regula-

tor 2. Connect one side of step-down switching regulator

2 inductor to this pin.

SW3 (Pin 26): Switch Pin for Step-Down Switching Regula-

tor 3. Connect one side of step-down switching regulator

3 inductor to this pin.

PVIN3 (Pin 27): Power Input for Step-Down Switching

Regulator 3. Tie this pin to the VIN supply. This pin should

be bypassed to ground with a 4.7μF or greater ceramic

capacitor.

VSTB (Pin 28): Voltage Standby. When VSTB is low, DAC

reference registers are selected by bit values in command

forced xxDVT2 registers. Tie VSTB to ground if unused.

PGOOD (Pin 29): Power Good Output. Open-drain output

pulls down when any regulator falls below power good

threshold and during regulator dynamic voltage slew

unless disabled in I2C register. Pulls down when all regula-

tors are disabled.

SCL (Pin 30): Clock Input Pin for the I2C Serial Port. The

I2C logic levels are scaled with respect to DVDD.

SDA (Pin 31): Data Input Pin for the I2C Serial Port. The

I2C logic levels are scaled with respect to DVDD.

DVDD (Pin 32): Supply Voltage for I2C Serial Port. This

pin sets the logic reference level of SCL and SDA I2C pins.

DVDD resets I2C registers to power on state when driven

to <1V. SCL and SDA logic levels are scaled to DVDD. Con-

nect a 0.1μF decoupling capacitor from this pin to ground.

BUCK2_FB (Pin 33): Feedback Input for Step-Down

Switching Regulator 2. Set full-scale output voltage using

resistor divider connected from the output of step-down

switching regulator 2 to this pin to ground.

BUCK3_FB (Pin 34): Feedback Input for Step-Down

Switching Regulator 3. Set full-scale output voltage using

resistor divider connected from the output of step-down

switching regulator 3 to this pin to ground.

LDO1_FB (Pin 35): Feedback Input for LDO1. Set out-

put voltage using a resistor divider connected from

LDO1_STDBY to this pin to ground.

LDO1_STDBY (Pin 36): Always-On LDO1 Output. This pin

provides an always-on supply voltage useful for light loads

such as a watchdog microprocessor or a real-time clock.

Connect a 1μF capacitor from LDO1_STBY to ground.

VIN (Pin 37): Supply Voltage Input. This pin should

be bypassed to ground with a 1μF or greater ceramic

capacitor.

LDO2_FB (Pin 38): Feedback Input for LDO2. Set full-scale

output voltage using a resistor divider connected from

LDO2_OUT to this pin to ground.

BUCK1_FB (Pin 39): Feedback Input for Step-Down

Switching Regulator 1. Set full-scale output voltage using

resistor divider connected from the output of step-down

switching regulator 1 to this pin to ground.

BB_FB (Pin 40): Feedback Input for Buck-Boost Switching

Regulator 4. Set the output voltage using resistor divider

connected from BB_OUT to this pin to ground.

GND (Exposed Pad Pin 41): Ground. The Exposed Pad must

be connected to a continuous ground plane on the second

layer of the printed circuit board by several interconnect

vias directly under the LTC3589 for maximum heat transfer.

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