MAX4838A Datasheet, PDF (3/11 Pages) Maxim Integrated Products – Overvoltage-Protection Controllers with Status FLAG

Overvoltage-Protection Controllers with
Status FLAG
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
TIMING
Startup Delay
FLAG Blanking Time
GATE Turn-On Time
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
t_START
t_BLANK
V_IN > V_UVLO, V_GATE > 0.3V, Figure 1
V_GATE > 0.3V, V_FLAG > 2.4V, Figure 1
20
50
80
ms
20
50
80
ms
V_GATE = 0.3V to 8V (MAX4838A/MAX4840A),
t_GON VGATE = 0.3V to 6V (MAX4842A),
10
ms
C_GATE = 1500pF, Figure 1
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
6
20
µs
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
V_IN increasing from 0 to 8V
Initial Overvoltage Fault Delay
t_OVP
(MAX4838A/MAX4840A), V_IN increasing
from 0V to 6V (MAX4842A), I_GATE = 80% of
1.5
µs
I_PD, Figure 3
Disable Time
t_DIS
V_EN = 2.4V, V_GATE = 0.3V, Figure 4
2
µs
Note 1: All parts are 100% tested at +25°C. Electrical limits across the full temperature range are guaranteed by design and
correlation.
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.)
REVERSE CURRENT
SUPPLY CURRENT vs. INPUT VOLTAGE
vs. OUTPUT VOLTAGE
600
1000
MAX4838A/MAX4840A
GATE VOLTAGE vs. INPUT VOLTAGE
12
500
SINGLE MOSFET
100
9
400
300
10
6
MAX4840A
MAX4838A
200
1
BACK-TO-BACK MOSFETS
3
100
0
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
0.1
3.5
4.0
4.5
5.0
5.5
OUTPUT VOLTAGE (V)
0
3
4
5
6
7
8
INPUT VOLTAGE (V)
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