LT1674 datasheet(7/24 Pages) LINER

7 / 24 page

LTC3109

3109fa

PIN FUNCTIONS (DFN/SSOP)

C1B (Pin 9/Pin 11): Input to the Charge Pump and Rectiﬁer

Circuit for Channel B. Connect a capacitor from this pin

to the secondary winding of the “B” step-up transformer.

See the Applications Information section for recommended

capacitor values.

C1A (Pin 18/Pin 20): Input to the Charge Pump and Recti-

ﬁer Circuit for Channel A. Connect a capacitor from this pin

to the secondary winding of the “A” step-up transformer.

See the Applications Information section for recommended

capacitor values.

C2B (Pin 10/Pin 12): Input to the Gate Drive Circuit for

SWB. Connect a capacitor from this pin to the secondary

winding of the “B” step-up transformer. See the Applications

Information section for recommended capacitor values.

C2A (Pin 17/Pin 19): Input to the Gate Drive Circuit for

SWA. Connect a capacitor from this pin to the secondary

winding of the “A” step-up transformer. See the Applications

Information section for recommended capacitor values.

SWA (Pin 15/Pin 17): Connection to the Internal N-Chan-

nel Switch for Channel A. Connect this pin to the primary

winding of the “A” transformer.

SWB (Pin 12/Pin 14): Connection to the Internal N-Chan-

nel Switch for Channel B. Connect this pin to the primary

winding of the “B” transformer.

VINA (Pin 14/Pin 16): Connection to the Internal N-Channel

Switch for Channel A. Connect this pin to one side of the

input voltage source (see Typical Applications).

VINB (Pin 13/Pin 15): Connection to the Internal N-Channel

Switch for Channel B. Connect this pin to the other side of

the input voltage source (see Typical Applications).

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