LTC3719 데이터 시트보기 (PDF) - Linear Technology

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LTC3719

2-Phase, High Efficiency, Step-Down Controller for AMD Opteron™ CPUs

Linear Technology 

LTC3719

PI FU CTIO S

SW2, SW1 (Pins 25, 34): Switch Node Connections to

Inductors. Voltage swing at these pins is from a Schottky

diode (external) voltage drop below ground to VIN.

BOOST2, BOOST1 (Pins 26, 33): Bootstrapped Supplies

to the Topside Floating Drivers. External capacitors are con-

nected between the BOOST and SW pins, and Schottky

diodes are connected between the BOOST and INTVCC pins.

BG2, BG1 (Pins 27, 31): High Current Gate Drives for

Bottom N-Channel MOSFETS. Voltage swing at these pins

is from ground to INTVCC.

PGND (Pin 28): Driver Power Ground. Connect to sources

of bottom N-channel MOSFETS and the (–) terminals of CIN.

INTVCC (Pin 29): Output of the Internal 5V Linear Low

Dropout Regulator and the EXTVCC Switch. The driver and

control circuits are powered from this voltage source.

Decouple to power ground with a 1µF ceramic capacitor

placed directly adjacent to the IC and minimum of 4.7µF

additional tantalum or other low ESR capacitor.

EXTVCC (Pin 30): External Power Input to an Internal

Switch. This switch closes and supplies INTVCC, bypass-

ing the internal low dropout regulator whenever EXTVCC is

higher than 4.7V. See EXTVCC Connection in the Applica-

tions Information section. Do not exceed 7V on this pin

and ensure VEXTVCC ≤ VINTVCC.

VIN (Pin 32): Main Supply Pin. Should be closely de-

coupled to the IC’s signal ground pin.

PGOOD (Pin 36): Open-Drain Logic Output. PGOOD is

pulled to ground when the voltage on the EAIN pin is not

within ±10% of its set point.

sn3719 3719fs

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