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NCV8668

LDO Regulator - Very Low Iq, Window Watchdog, Enable and Reset 150 mA

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NCV8668

TYPICAL CHARACTERISTICS

Vin

Vout

VRT+ VRhys

VRT

VRO

tRD

< tRR

t

t

tRR

VROH

VROL

t

Figure 24. Reset Function and Timing Diagram

Trigger

Reset &

Disabled

Watchdog

Reset

Trigger

No Trigger

WD_ON

WD_ON

Long

Open

Window

Ignore

Window

WD_OFF or

Iout < Iout_WD_OFF

WD_OFF or

Iout < Iout_WD_OFF

No Trigger

Trigger

Disabled

Watchdog

WD_OFF or

Iout < Iout_WD_OFF

WD_OFF or

Iout < Iout_WD_OFF

Open

Window

No Trigger

Trigger

Closed

Window

WM1

WM2

Window Watchdog Mode

Reset Mode

L

L

FAST

FAST

L

H

SLOW

SLOW

H

L

FAST

SLOW

H

H

OFF

SLOW

Figure 25. Window Watchdog State Diagram, Watchdog and Reset Modes

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