LTC3772 데이터 시트보기 (PDF) - Linear Technology

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LTC3772

Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

Linear Technology 

W

FU CTIO AL DIAGRA

LTC3772

VIN

UNDERVOLTAGE UV

LOCKOUT

1µA

ITH/RUN

SHUTDOWN

– COMPARATOR

+

SHDN

VOLTAGE

REFERENCE

0.8V

SLEEP

– COMPARATOR

SLEEP

+

0.15V

0.225V

ERROR

AMPLIFIER

1.2V

SW

BURST

CLAMP

+

ITH

BUFFER

–

75mV

+–

SLOPE

COMPENSATION

IPRG

CURRENT

COMPARATOR

ILIM

RS R S

LATCH Q

SWITCHING

LOGIC AND

BLANKING

CIRCUIT

0V

OVERVOLTAGE

COMPARATOR

0.88V

550kHz

OSCILLATOR

VIN

FREQUENCY

FOLDBACK

PGATE

SHORT-CIRCUIT

DETECT

+–

0.3V

VFB

0.8V

SOFT-START

RAMP

GND

3772 FD

3772f

7

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