Overvoltage Protection Controllers
with Reverse Polarity Protection
MAX4864L/MAX4865L/MAX4866L/MAX4867
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
POWER-UP OVERVOLTAGE RESPONSE
MAX4864 toc09
NEGATIVE VOLTAGE RESPONSE
MAX4864 toc10
8V
ADAPTER
0V
8V
IN
0V
IN
0V
GATEN
0V
5V
FLAG
0V
20ms/div
20ms/div
5V
FLAG
0V
5V
ADAPTER
0V
0V
GATEP
Pin Description
PIN
MAX4864LEUT/
MAX4865LEUT/
MAX4866LEUT/
MAX4867EUT
1
2
3
MAX4864LELT/
MAX4865LELT/
MAX4866LELT/
MAX4867ELT
3
1
2
NAME
FUNCTION
IN
GND
FLAG
Voltage Input. IN is both the power-supply input and the overvoltage sense input.
Ground
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.
n-Channel MOSFET Gate-Drive Output. GATEN is the output of an on-chip charge
pump. When V
UVLO
< V
IN
< V
OVLO
, GATEN is driven high to turn on the external
n-channel MOSFET.
p-Channel MOSFET Gate-Drive Output. GATEP is always on when input is above
ground and off when input drops below ground.
Active-Low Enable Input. Connect to ground in normal operation. Drive
EN
high to
disable device and enter shutdown mode.
4
6
GATEN
5
6
5
4
GATEP
EN
_______________________________________________________________________________________
5
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