LTC3415 datasheet(9/36 Pages) LINER

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LTC3613

3613fa

PIN FUNCTIONS

RUN (Pin 26): Digital Run Control Input. RUN self biases

high with an internal 1.3μA pull-up. Forcing RUN below

1.2V disables switching. Taking RUN below 0.75V shuts

down all bias and places the LTC3613 into micropower

shutdown mode of approximately 15μA.

EXTVCC(Pin30):ExternalVCCInput.WhenEXTVCCexceeds

4.6V, an internal switch connects this pin to INTVCC and

shuts down the internal regulator so that the controller and

gate drive power is drawn from EXTVCC. EXTVCC should

not exceed VIN.

MODE/PLLIN (Pin 31): External Clock Synchronization

Input and/or Forced Continuous Mode Input. When an

external clock is applied to this pin, the rising switching

cycle will be synchronized with the rising edge of the

external clock. Additionally, this pin determines operation

under light load conditions. When either a clock input is

detected or MODE/PLLIN is tied to INTVCC, forced continu-

ous mode operation is selected. Tying this pin to SGND

allows discontinuous pulse-skipping mode operation at

light loads.

SVIN (Pin 32): Signal Input Supply. This pin powers the

internal control circuitry.

INTVCC (Pins 33, 34): Internal 5.3V Regulator Output. The

driver and control circuits are powered from this voltage.

Decouple this pin to power ground with a minimum of

4.7μF ceramic capacitor (CVCC). The anode of the Schottky

diode, DB, connects to this pin.

PGND (Pins 36-44): Power Ground Connection. Connect

this pin as close as practical to the (–) terminal of CVCC

and the (–) terminal of CIN.

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