MAX4838EXT-T 데이터 시트보기 (PDF) - Maxim Integrated
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MAX4838EXT-T Datasheet PDF : 10 Pages
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Overvoltage Protection Controllers with
Status FLAG
PIN
MAX4838/ MAX4839/
MAX4840 MAX4841
1
1
2
2
3
3
4
4
5
5, 6
6
—
Pin Description
NAME
FUNCTION
IN
GND
FLAG
GATE
N.C.
EN
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 VUVLO < VIN <
VOVLO, GATE is driven high to turn on the external N-channel MOSFET(s).
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.
VIN
0V
VGATE
VFLAG
VUVLO
tSTART
5V
tGON
8V
0.3V
tBLANK
2.4V
Figure 1. Startup Timing Diagram
VIN
5V
VGATE
VFLAG
VOVLO
tGOFF
tFLAG
0.3V
Figure 2. Shutdown Timing Diagram
8V
0.4V
VIN
VOVLO
0V
tOVP
80%
IGATE
8V
VEN
1.47V
VGATE
tDIS
0.3V
Figure 3. Power-Up Overvoltage Timing Diagram
Figure 4. Disable Timing Diagram
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