Overvoltage Protection Controllers

with Reverse Polarity Protection

_______________________________________________________________________________________

5

POWER-UP OVERVOLTAGE RESPONSE

MAX4864 toc09

IN

FLAG

GATEN

ADAPTER

20ms/div

8V

0V

8V

0V

5V

0V

0V

NEGATIVE VOLTAGE RESPONSE

MAX4864 toc10

GATEP

FLAG

IN

ADAPTER

20ms/div

0V

0V

5V

0V

5V

0V

PIN

MAX4864LEUT/

MAX4865LEUT/

MAX4866LEUT/

MAX4867EUT

MAX4864LELT/

MAX4865LELT/

MAX4866LELT/

MAX4867ELT

NAME

FUNCTION

13

IN

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

21

GND

Ground

32

FLAG

Fault-Indication Output. When

EN goes high, FLAG becomes high-impedance. FLAG

is asserted high during undervoltage lockout and overvoltage lockout conditions.

FLAG is deasserted during normal operation. FLAG is an open-drain output.

46

GATEN

n-Channel MOSFET Gate-Drive Output. GATEN is the output of an on-chip charge

n-channel MOSFET.

55

GATEP

p-Channel MOSFET Gate-Drive Output. GATEP is always on when input is above

ground and off when input drops below ground.

64

EN

Active-Low Enable Input. Connect to ground in normal operation. Drive

EN high to

disable device and enter shutdown mode.

Pin Description

Typical Operating Characteristics (continued)