SC1112STRT datasheet(5/23 Pages) SEMTECH

5 / 23 page

 2006 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

SC1112

PWRGD

DELAY=1.5V

DELAY

VTT

SHORT-CIRCUIT DURING NORMAL

OPERATION

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

0.7V, the delay capacitor

begins charging.

If VTT is still below 0.7V when

DELAY reaches 1.5V,

VTTGATE is latched off.

VTTIN

VTT=0.7V

VTT=1.08V

VTTGATE

VTT=0.7V

PWRGD

VTT=1.08V

DELAY

SHORT-CIRCUIT AND RECOVERY

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 0.7V, the delay

capacitor begins charging.

If VTT recovers above 0.7V

before DELAY reaches 1.5V,

DELAY is again discharged.

If VTT reaches 1.08V the delay

capacitor begins charging and

normal operation continues.

VTTIN

VTT=1.08V

VTTGATE

DELAY=1.5V

Timing Diagrams (Cont.)

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