MAX4838 Maxim, MAX4838 Datasheet - Page 5

• Manufacturer Part Number: MAX4838
• Description: Overvoltage Protection Controllers with Status FLAG
• Manufacturer: Maxim

Figure 1. Startup Timing Diagram
Figure 3. Power-Up Overvoltage Timing Diagram
MAX4838/
MAX4840
V
V
I
GATE
FLAG
GATE
V
V
0V
1
2
3
4
5
6
0V
IN
IN
PIN
MAX4839/
MAX4841
V
V
OVLO
UVLO
5, 6
—
1
2
3
4
_______________________________________________________________________________________
t
Overvoltage Protection Controllers with
START
t
OVP
NAME
GATE
FLAG
GND
N.C.
0.3V
EN
t
IN
GON
80%
5V
8V
t
BLANK
Input. IN is both the power-supply input and the overvoltage sense input. Bypass IN to
GND with a 1µF capacitor or larger.
Ground
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.
Gate-Drive Output. GATE is the output of an on-chip charge pump. When V
V
No Connection. Can be connected to GND.
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.
OVLO
, GATE is driven high to turn on the external N-channel MOSFET(s).
2.4V
8V
Figure 2. Shutdown Timing Diagram
Figure 4. Disable Timing Diagram
V
V
FLAG
GATE
V
5V
V
IN
GATE
V
EN
FUNCTION
V
OVLO
1.47V
t
GOFF
t
DIS
Status FLAG
0.3V
0.3V
Pin Description
t
FLAG
UVLO
0.4V
< V
IN
8V
<
5