LTC3589-1 datasheet(12/38 Pages) LINER

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LTC3676/LTC3676-1

3676ff

For more information www.linear.com/LTC3676

pin FuncTions

used to activate the WAKE output by driving high. Drive

low to shut down WAKE.

FB_B3 (Pin 22/Pin 27): 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.

FB_B4 (Pin 23/Pin 28): Feedback Input for Step-Down

Switching Regulator 4. Set full-scale output voltage using

resistor divider connected from the output of step-down

switching regulator 4 to this pin to ground.

FB_B1 (Pin 24/Pin 29): 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.

FB_B2 (Pin 25/Pin 30): 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.

FB_L1 (Pin 26/Pin 31): Feedback Input for LDO1. Set

output voltage using a resistor divider connected from

LDO1 to this pin to ground.

VIN (Pin 27/Pin 32): Supply Voltage Input. This pin should

be bypassed to ground with a 1μF or greater ceramic

capacitor. All switching regulator PVIN supplies should

be tied to VIN.

LDO1 (Pin 28/Pin 33): Always On LDO1 Output. This pin

providesanalways-onsupplyvoltageusefulforlightloads

such as a watchdog microprocessor or a real time clock.

Connect a 1μF capacitor from LDO1 to ground.

ON (Pin 29/Pin 34): Pushbutton Input. A weak internal

pull-up forces ON high when left floating. A normally open

pushbutton is connected from ON to ground forcing a low

state when pushed.

EN_L2 (Pin 30/Pin 35): Enable LDO2 Input. Active high

enables LDO2. A weak pull-down pulls EN_L2 low when

left floating.

SW2 (Pin 31/Pin 38): Switch Pin for Step-Down Switch-

ing Regulator 2. Connect one side of step-down switching

regulator 2 inductor to this pin.

IRQ(Pin32/Pin39):InterruptRequestOutput.Open-drain

driver is pulled low for power good, undervoltage, and

overtemperature warning and fault conditions. Clear IRQ

by writing to the I2C CLIRQ command register.

WAKE (Pin 33/Pin 40): 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.

EN_B2 (Pin 34/Pin 41): Enable Step-Down Switching

Regulator 2. Active high input enables step-down switching

regulator 2.Aweakpull-downpullsEN_B2lowwhenleftfloating.

PVIN2(Pin35/Pin42):PowerInputforStep-DownSwitch-

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

be bypassed to ground with a 10μF or greater ceramic

capacitor.

PVIN1 (Pin 36/Pin 43): PowerInputforStep-DownSwitching

Regulator1.TiethispintoVINsupply.Thispinshouldbebypassed

to ground with a 10μF or greater ceramic capacitor.

EN_B1 (Pin 37/Pin 44): Enable Step-Down Switching

Regulator 1. Active high enables step-down switching

regulator 1. The LTC3676-1 EN_B1 pin enables both VTTR

output and switching regulator 1. A week pull-down pulls

EN_B1 low when left floating.

RSTO (Pin 38/Pin 45): Reset Output. Open-drain output

pulls low when the always-on regulator LDO1 is below

regulation or during a hard reset initiated by a pushbutton

input or command registers.

PGOOD (Pin 39/Pin 46): Power Good Output. Open-drain

output pulls low when any enabled regulator falls below

power good threshold or during dynamic voltage slew

unless disabled in command register. Pulls low when all

regulators are disabled.

SW1 (Pin 40/Pin 47): Switch Pin for Step-Down Switch-

ing Regulator 1. Connect one side of step-down switching

regulator 1 inductor to this pin.

GND (Exposed Pad Pin 41/Pin 49): Ground. The exposed

pad must be connected to a continuous ground plane of

the printed circuit board by multiple interconnect vias

directly under the LTC3676 to maximize electrical and

thermal conduction.

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