LTC3801 datasheet(4/12 Pages) LINER

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LTC3801/LTC3801B

sn3801 3801fs

PI FU CTIO S

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

serves as the error amplifier compensation point as well as

the run control input. Nominal voltage range for this pin is

0.7V to 1.9V. Forcing this pin below 0.6V 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 resistor divider across the output.

SENSE– (Pin 4): Current Sense Pin. An external sense

resistor is connected between this pin and VIN (Pin 5).

VIN (Pin 5): Supply Pin. This pin must be closely de-

coupled to GND (Pin 2).

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

MOSFET. This pin swings from 0V to VIN.

0.15V

SLEEP

COMPARATOR

1.2V

BURST

CLAMP

BURST

DEFEAT

(LTC3801B)

SHUTDOWN

COMPARATOR

ERROR

AMPLIFIER

OVERVOLTAGE

COMPARATOR

SHORT-CIRCUIT

DETECT

SLEEP

SHDN

µA (LTC3801)

µA (LTC3801B)

ITH/RUN

0.225V

0.8V

0.88V

PGATE

SOFT-START

CLAMP

550kHz

OSCILLATOR

SLOPE

COMPENSATION

CURRENT

COMPARATOR

UNDERVOLTAGE

LOCKOUT

SWITCHING

LOGIC AND

BLANKING

CIRCUIT

0.3V

–

VIN

–

VOLTAGE

REFERENCE

0.8V

ITH

BUFFER

0.3V

LATCH

VIN

FREQUENCY

FOLDBACK

VFB

3801 FD

GND

SENSE–

15mV (LTC3801B)

ILIM

BURST

DEFEAT

(LTC3801B)

FU CTIO AL DIAGRA

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