SC1112(2001) 查看數據表（PDF） - Semtech Corporation

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SC1112
(Rev.:2001)

Triple Low Dropout Regulator Controllers

Semtech Corporation 

POWER MANAGEMENT

Timing Diagrams (Cont.)

VTTIN

SHORT-CIRCUIT DURING NORMAL

OPERATION

VTT

Once VTT drops out of

regulation, VTTGATE turns on

harder to try and raise VTT.

When VTT drops below 1.08V,

the delay capacitor is

discharged and PWRGD goes

low. When VTT drops below DELAY

0.7V, the delay capacitor

begins charging.

If VTT is still below 0.7V when

DELAY reaches 1.5V,

VTTGATE is latched off.

VTT=1.08V

VTT=0.7V

DELAY=1.5V

PWRGD

VTTGATE

VTTIN

SHORT-CIRCUIT AND RECOVERY

DURING NORMAL OPERATION

Once VTT drops out of

regulation, VTTGATE turns on

VTT

harder to try and raise VTT.

When VTT drops below 1.08V,

the delay capacitor is discharged

and PWRGD goes low. When

VTT drops below 0.7V, the delay

capacitor begins charging.

If VTT recovers above 0.7V

before DELAY reaches 1.5V,

DELAY is again discharged.

DELAY

If VTT reaches 1.08V the delay

capacitor begins charging and

normal operation continues.

VTT=1.08V

VTT=0.7V

VTT=1.08V

DELAY=1.5V

PWRGD

 2001 Semtech Corp.

VTTGATE

5

SC1112

www.semtech.com

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