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LTC1772

1772fb

FUNCTIONAL DIAGRA

SWITCHING

LOGIC AND

BLANKING

CIRCUIT

–

0.5

µA

0.3V

OVP

SHORT-CIRCUIT

DETECT

SHDN

1.2V

1772 FD

VREF

60mV

VREF

0.8V

VIN

RS1

VOLTAGE

REFERENCE

SLOPE

COMP

ICMP

FREQ

FOLDBACK

OSC

SENSE–

VIN

–

EAMP

VFB

–

PGATE

VIN

ITH/RUN

VIN

0.35V

VREF

0.8V

–

SHDN

CMP

GND

–

UNDERVOLTAGE

LOCKOUT

VIN

0.15V

–

BURST

CMP

SLEEP

PIN FUNCTIONS

ITH/RUN (Pin 1): This pin performs two functions. It

serves as the error amplifier compensation point as well as

the run control input. The current comparator threshold

increases with this control voltage. Nominal voltage range

for this pin is 0.7V to 1.9V. Forcing this pin below 0.35V

causes the device to be shut down. In shutdown all

functions are disabled and the PGATE pin is held high.

GND (Pin 2): Ground Pin.

VFB (Pin 3): Receives the feedback voltage from an exter-

nal resistive divider across the output.

SENSE– (Pin 4): The Negative Input to the Current Com-

parator.

VIN (Pin 5): Supply Pin. Must be closely decoupled to GND

Pin 2.

PGATE (Pin 6): Gate Drive for the External P-Channel

MOSFET. This pin swings from 0V to VIN.

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