LTC1735IGN datasheet(8/32 Pages) LINER

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LTC1735

1735fc

VOSENSE: Receives the feedback voltage from an external

resistive divider across the output.

SENSE– : The (–) Input to the Current Comparator.

SENSE+: The (+) Input to the Current Comparator. Built-in

offsets between SENSE– and SENSE+ pins in conjunction

with RSENSE set the current trip threshold.

PGOOD (LTC1735F Only): Open-Drain Logic Output.

PGOOD is pulled to ground when the voltage on the

VOSENSE pin is not within ±7.5% of its set point.

EXTVCC: Input to the Internal Switch Connected to INTVCC.

This switch closes and supplies VCC power whenever

EXTVCC is higher than 4.7V. See EXTVCC connection in the

Applications Information section. Do not exceed 7V on

this pin and ensure EXTVCC ≤ VIN.

PGND: Driver Power Ground. Connects to the source of

bottom N-channel MOSFET, the anode of the Schottky

diode, and the (–) terminal of CIN.

BG:

High

Current

Gate

Drive

for

Bottom

N-Channel MOSFET. Voltage swing at this pin is from

ground to INTVCC.

INTVCC: Output of the Internal 5.2V Regulator and EXTVCC

Switch. The driver and control circuits are powered from

this voltage. Decouple to power ground with a 1

µFceramic

capacitor placed directly adjacent to the IC together with a

minimum of 4.7

µF tantalum or other low ESR capacitor.

VIN: Main Supply Pin. Must be closely decoupled to power

ground.

SW: Switch Node Connection to Inductor and Bootstrap

Capacitor. Voltage swing at this pin is from a Schottky

diode (external) voltage drop below ground to VIN.

BOOST: Supply to Topside Floating Driver. The bootstrap

capacitor is returned to this pin. Voltage swing at this pin

is from a diode drop below INTVCC to (VIN + INTVCC).

TG: High Current Gate Drive for Top N-Channel MOSFET.

This is the output of a floating driver with a voltage swing

equal to INTVCC superimposed on the switch node voltage

SW.

PI FU CTIO S

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