Datasheet

MAX4838A/MAX4840A/MAX4842A
Overvoltage-Protection Controllers with
Status
FLAG
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +5V (MAX4838A/MAX4840A), V
IN
= +4V (MAX4842A), T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TIMING
Startup Delay t
START
V
IN
> V
UVLO
, V
GATE
> 0.3V, Figure 1 20 50 80 ms
FLAG Blanking Time t
BLANK
V
GATE
> 0.3V, V
FLAG
> 2.4V, Figure 1 20 50 80 ms
GATE Turn-On Time t
GON
V
GA TE
= 0.3V to 8V ( M AX 4838A/M AX 4840A) ,
V
GA TE
= 0.3V to 6V ( M AX 4842A) ,
C
GA TE
= 1500p F, Fi g ur e 1
10 ms
GATE Turn-Off Time t
GOFF
V
IN
increasing from 5V to 8V at 3V/µs
(MAX4838A/MAX4840A), V
IN
increasing
from 4V to 6V at 3V/µs (MAX4842A),
V
GATE
= 0.3V, C
GATE
= 1500pF, Figure 2
620µs
FLAG Assertion Delay t
FLAG
V
IN
increasing from 5V to 8V at 3V/µs
(MAX4838A/MAX4840A), V
IN
increasing
from 4V to 6V at 3V/µs (MAX4842A),
V
FLAG
= 0.4V, Figure 2
5.8 µs
Initial Overvoltage Fault Delay t
OVP
V
IN
increasing from 0 to 8V
(MAX4838A/MAX4840A), V
IN
increasing
from 0V to 6V (MAX4842A), I
GATE
= 80% of
I
PD
, Figure 3
1.5 µs
Disable Time t
DIS
V
EN
= 2.4V , V
GA TE
= 0.3V , Fi g ur e 4 2 µs
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX4838A toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
252015105
100
200
300
400
500
600
0
030
REVERSE CURRENT
vs. OUTPUT VOLTAGE
MAX4838A toc02
OUTPUT VOLTAGE (V)
REVERSE CURRENT (µA)
5.04.54.0
1
10
100
1000
0.1
3.5 5.5
SINGLE MOSFET
BACK-TO-BACK MOSFETS
MAX4838A/MAX4840A
GATE VOLTAGE vs. INPUT VOLTAGE
MAX4838A toc03
INPUT VOLTAGE (V)
GATE VOLTAGE (V)
7654
3
6
9
12
0
38
MAX4840A MAX4838A
Typical Operating Characteristics
(V
IN
= +5V (MAX4838A/MAX4840A), V
IN
= +4V (MAX4842A); Si9936DY external MOSFET in back-to-back configuration; T
A
= +25°C,
unless otherwise noted.)
Note 1: All parts are 100% tested at +25°C. Electrical limits across the full temperature range are guaranteed by design and
correlation.