MP2420―75V, 0.3A, SYNCHRONOUS STEP-DOWN CONVERTER WITH WATCHDOG

MP2420 Rev. 1.0

www.MonolithicPower.com

5

9/6/2015

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Parameter

Symbol Condition

Min

Typ

Max

Units

Watchdog Power Supply

Timer voltage

0.3

V

16

19

μA

Quiescent current

25

32

μA

4.4

4.6

4.8

V

Power-on reset

threshold

4.3

4.5

4.7

V

Watchdog Timing

Single period

T

-10%

880

+10%

µs

Power-on delay

(6)

10

cycle

Sync signal monitoring

time

(6)

450

cycle

Watchdog window close

time (short mode)

(6)

15

cycle

Watchdog window open

time (short mode)

(6)

10

cycle

Watchdog window close

time (long mode)

(6)

1500

cycle

Watchdog window open

time (long mode)

(6)

1000

cycle

WDO reset pulse

width

(6)

4

cycle

WDI_OK pulse width

10

5000

μs

Watchdog Input and Output

WDI logic high

3.2

V

WDI logic low

0.8

V

MODE logic high

3.2

V

MODE logic low

0.8

V

MODE = 5V

0.1

1

μA

MODE input current

MODE = 0V

5

8

μA

/WD_DIS logic high

3.2

V

/WD_DIS logic low

0.8

V

WD_DIS = 5V

0.1

1

μA

/WD_DIS input current

WD_DIS = 0V

5

8

μA

WDO high

V

0.2

V

WDO low

0.1

V

NOTE:

6) Guaranteed by design.