NCV8881_11 datasheet(9/33 Pages) ONSEMI

Part #	NCV8881

Description	1.5A Automotive Buck Regulator with Watchdog

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NCV8881

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9

WATCHDOG

ELECTRICAL CHARACTERISTICS (VVIN = 13.2 V, VEN = 2 V, CIN = 4.7 mF unless specified otherwise) Min/Max values are valid for

the temperature range −40°C vTJ v 150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

WATCHDOG INPUT (WDI pin)

Input High Voltage

2.0

V

Input Low Voltage

0.8

V

Input Current

VWDI = 5.0 V

5

10

mA

Threshold Frequency

fWDTH

to prevent RESB low

RDLY = 10 kW

RDLY = 20 kW

RDLY = 30 kW

20.85

10.42

6.95

Hz

RDLY INPUT

Output Voltage

RDLY = 10 kW

0.917

0.99

1.067

V

Output Voltage

RDLY = 30 kW

0.940

1.02

1.092

V

RESB OUTPUT

Output Voltage Low

VRBLO

VFB < VFBMONL, sinking 0.5 mA

0.03

0.1

V

Output leakage

VFB > VFBMONH

0.4

5

mA

POR Delay Time

tPOR

VFB > VFBMONH to RESB high;

RDLY = 10 kW

RDLY = 20 kW (Note 8)

RDLY = 30 kW (Note 8)

RDLY = open; ROSC = 36 kW (Note 8)

RDLY = open; ROSC = open

4.0

8

12

5

10

15

6.0

12

18

50

110

ms

Boot Delay Time

tBD

RESB high to low;

RDLY = 10 kW

RDLY = 20 kW (Note 8)

RDLY = 30 kW (Note 8)

RDLY = open; ROSC = 36 kW (Note 8)

RDLY = open; ROSC = open

40

80

120

50

100

150

60

120

180

500

1100

ms

Watchdog Delay Time

tWD

WDI low to RESB low;

RDLY = 10 kW

RDLY = 20 kW (Note 8)

RDLY = 30 kW (Note 8)

RDLY = open; ROSC = 36 kW (Note 8)

RDLY = open; ROSC = open

48

96

144

60

120

180

72

144

216

550

1300

ms

8. Guaranteed by design.

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