LTC3589 datasheet(14/36 Pages) LINER

14 / 36 page

LTC3375

3375fa

For more information www.linear.com/3375

pin FuncTions

EN8 (Pin 37): Buck Regulator 8 Enable Input. Active high.

EN7 (Pin 38): Buck Regulator 7 Enable Input. Active high.

WDO (Pin 39): Watchdog Timer Output. Open-drain

output. WDO is pulled low for 200ms during a watchdog

timer failure.

WDI (Pin 40): Watchdog Timer Input. The WDI pin must

be toggled either low to high or high to low every 1.5

seconds. Failure to toggle WDI results in the WDO pin

being pulled low for 200ms.

VCC (Pin 41): Always-On LDO Output Voltage/Internal

Bias Supply. When used as a regulator, VCC should be

connected to the emitter/source of the external LDO NPN/

NFET transistor. VCC serves as a low voltage rail that may

be used to provide power to external circuitry, and is

also used to power the internal top level circuitry of the

LTC3375. Alternatively the VCC pin may be connected to

a 2.7V to 5.5V external power supply. In this case FBVCC

and VSHNT should be tied to ground.

FBVCC (Pin 42): Always-On LDO Feedback Pin. Receives

feedback by a resistor divider connected across VCC.

VSHNT (Pin 43): Shunt Regulator Base Control Voltage.

VSHNT should be connected to the base/gate of an external

highvoltageNPN/NFETtransistorandtoitscollector/drain

through a resistor.

TEMP (Pin 44): Temperature Indication Pin. TEMP out-

puts a voltage of 150mV (typical) at room temperature.

The TEMP voltage will change by 6.75mV/°C (typical)

giving an external indication of the LTC3375 internal die

temperature.

SCL (Pin 45): Serial Clock Line for I2C Port.

SDA (Pin 46): Serial Data Line for I2C Port. Open-drain

output during read back.

EN2 (Pin 47): Buck Regulator 2 Enable Input. Active high.

EN1 (Pin 48): Buck Regulator 1 Enable Input. Active high.

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

must be connected to a continuous ground plane on the

printedcircuitboarddirectlyundertheLTC3375forelectri-

cal contact and rated thermal performance.

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