Overvoltage-Protection Controllers with

Status

FLAG

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5

PIN

NAME

FUNCTION

1IN

Input. IN is both the power-supply input and the overvoltage sense input. Bypass IN to GND with

a 1µF capacitor or larger.

2

GND

Ground

3

FLAG

Fault Indication Output, Open-Drain, Active Low. FLAG is asserted low during undervoltage-

lockout and overvoltage-lockout conditions. FLAG is deasserted during normal operation.

4

GATE

GATE is driven high to turn on the external n-channel MOSFET(s).

5N.C.

No Connection. Not internally connected for µDFN package. Connected to ground for SC70

6-pin package; connect to ground or leave unconnected.

6

EN

Device Enable Input, Active Low. Drive EN low or connect to ground to allow normal device

operation. Drive EN high to turn off the external MOSFET.

Pin Description

0V

0.3V

2.4V

8V (6V)

5V (4V)

( ) MAX4842A

Figure 1. Startup Timing Diagram

0.3V

0.4V

5V (4V)

8V (6V)

( ) MAX4842A

Figure 2. Shutdown Timing Diagram

80%

0V

8V (6V)

( ) MAX4842A

Figure 3. Power-Up Overvoltage Timing Diagram

0.3V

1.5V

Figure 4. Disable Timing Diagram

Timing Diagrams