LTC3109
PIN FUNCTIONS (DFꢁ/SSOP)
CꢀB(Pin9/Pinꢀꢀ):InputtotheChargePumpandRectifier
Circuit for Channel B. Connect a capacitor from this pin
to the secondary winding of the “B” step-up transformer.
SeetheApplicationsInformationsectionforrecommended
capacitor values.
SWꢃ (Pin ꢀ5/Pin ꢀ7): Connection to the Internal N-Chan-
nel Switch for Channel A. Connect this pin to the primary
winding of the “A” transformer.
SWB (Pin ꢀ2/Pin ꢀ4): Connection to the Internal N-Chan-
nel Switch for Channel B. Connect this pin to the primary
winding of the “B” transformer.
Cꢀꢃ (Pin ꢀ8/Pin 23): Input to the Charge Pump and Recti-
fierCircuitforChannelA. Connectacapacitorfromthispin
to the secondary winding of the “A” step-up transformer.
SeetheApplicationsInformationsectionforrecommended
capacitor values.
V
(Pinꢀ4/Pinꢀ6):ConnectiontotheInternalN-Channel
Iꢁꢃ
Switch for Channel A. Connect this pin to one side of the
input voltage source (see Typical Applications).
V
(Pinꢀ±/Pinꢀ5):ConnectiontotheInternalN-Channel
IꢁB
C2B (Pin ꢀ3/Pin ꢀ2): Input to the Gate Drive Circuit for
SWB. Connect a capacitor from this pin to the secondary
windingofthe“B”step-uptransformer.SeetheApplications
Information section for recommended capacitor values.
Switch for Channel B. Connect this pin to the other side of
the input voltage source (see Typical Applications).
C2ꢃ (Pin ꢀ7/Pin ꢀ9): Input to the Gate Drive Circuit for
SWA. Connect a capacitor from this pin to the secondary
windingofthe“A”step-uptransformer.SeetheApplications
Information section for recommended capacitor values.
3109fa
7
Linear Systems [ Linear Systems ]
