LTC3589 Linear Technology, LTC3589 Datasheet - Page 13

• Manufacturer Part Number: LTC3589
• Description: 8-Output Regulator
• Manufacturer: Linear Technology

PIN FUNCTIONS
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. 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 Switching Regulator 3.
Tie this pin to the V
to ground with a 4.7μF or greater ceramic capacitor.
VSTB (Pin 28): Voltage Standby. When VSTB is low, DAC
reference voltages are selected by bit values in command
register VCCR. When VSTB is high, the DAC voltages are
forced to the bit values found in the V2 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. Un-
less disabled in I
are disabled.
SCL (Pin 30): Clock Input Pin for the I
I
SDA (Pin 31): Data Input Pin for the I
I
2
2
C logic levels are scaled with respect to DV
C logic levels are scaled with respect to DV
2
C register. Pulls down when all regulators
IN
supply. This pin should be bypassed
2
2
C Serial Port. The
C Serial Port. The
DD
DD
.
.
DV
pin sets the logic reference level of SCL and SDA I
DV
<1V. SCL and SDA logic levels are scaled to DV
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.
V
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 inter-
connect vias directly under the LTC3589 for maximum
heat transfer.
IN
DD
DD
(Pin 37): Supply Voltage Input. This pin should
resets I
(Pin 32): Supply Voltage for I
2
C registers to power on state when driven to
2
www.DataSheet4U.com
C Serial Port. This
LTC3589
DD
. Connect
2
13
C pins.
3589p