Overvoltage Protection Controllers with

Status FLAG

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5

PIN

MAX4838/

MAX4840

MAX4839/

MAX4841

NAME

FUNCTION

11IN

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

GND with a 1µF capacitor or larger.

2

2

GND

Ground

33

FLAG

Fault Indication Output, Active Low. FLAG is asserted low during undervoltage lockout

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

is open-drain on the MAX4838/MAX4840, and push-pull on the MAX4839/MAX4841.

4

4

GATE

5

5, 6

N.C.

No Connection. Can be connected to GND.

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

5V

Figure 1. Startup Timing Diagram

0.3V

0.4V

5V

8V

Figure 2. Shutdown Timing Diagram

80%

0V

8V

Figure 3. Power-Up Overvoltage Timing Diagram

0.3V

1.47V

Figure 4. Disable Timing Diagram