User Manual

MAX4881–MAX4884
Overvoltage Protection Controllers with
Current Limit in TDFN
6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1IN
Input. IN is the power input for the OVP charge pump. Bypass IN to GND with a 1µF capacitor or
larger.
2 EN
Active-Low Enable Input. Drive EN high to turn off the external MOSFET. Driving EN low activates
the OVP circuitry and turns on the external MOSFET.
3 GATE
Gate Drive Output. GATE is the output of an on-chip OVP charge pump. When V
UVLO
< V
IN
<
V
OVLO
, GATE is driven high to turn on the external n-channel MOSFET.
4 BTA
Internal Current-Limited Switch Terminal. Connect BTA to the source of the external n-channel
MOSFET. BTA is the power input for the entire device (except the OVP charge pump). Bypass BTA
to GND with a 0.1µF capacitor as close to the device as possible for proper operation.
5CB
Active-Low Internal Current-Limited-Switch Control Input. Drive CB high to turn on the internal
switch, pull CB low to turn off the internal switch.
6 GND Ground
7 BTB
Internal Current-Limited-Switch Output. Bypass BTB to GND with 0.1µF capacitor as close to the
device as possible.
8 FLAGI
Active-Low Open-Drain Internal Current-Limited Flag Output. FLAGI asserts low when the current
is at the limit for longer than the blanking time. FLAGI is disabled when EN goes high.
9 N.C. No Connection. Not internally connected.
10 OV
Active-Low Open-Drain IN-Overvoltage Flag Output. OV goes low when an
undervoltage/overvoltage fault occurs at IN. OV is disabled when EN goes high.
—EP
Exposed Pad. EP is internally connected to GND. Do not use EP as the only electrical ground
connection.