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With a 22nF gate capacitor, the inrush current, charge,
and discharge times are:
Case B: Fast Turn-On (With Current Limit)
In applications where the board capacitance (C
BOARD
)
is high, the inrush current causes a voltage drop across
R
SENSE
that exceeds the startup fast-comparator
threshold. The fast comparator regulates the voltage
across the sense resistor to V
FC,TH
. This effectively reg-
ulates the inrush current during startup. In this case,
the current charging C
BOARD
can be considered con-
stant and the turn-on time is:
t
C
V
R
V
ON
BOARD
IN
SENSE
FCTH
=
?/DIV>
?/DIV>
           
I
F
pF
nF
A
mA
t
nF
V
nC
A
ms
t
nF
V
nC
mA
ms
nF
V
nC
mA
s
INRUSH
CHARGE
DISCHARGE
DISCHARGE STRONG
=
?/DIV>
+
?/DIV>
+
=
=
?/DIV>
+
?/DIV>
=
=
?/DIV>
+
=
=
?/DIV>
+
=
6
600
22
100
0
26 5
22
10 4
60
100
2 89
22
10 4
60
3
0 096
22
10 4
60
50
5 8
    
    
    
.
        .        
.
        .        
.
        .        
       .
(
)
?/DIV>
?/DIV>
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
20   _______________________________________________________________________  ________________________________________________  __________________________________  ___________________
INY
GATEY
INZ
GATEZ
Q1
R
SENSEY
SENSEY
R
SENSEZ
SENSEZ
Q2
C
BOARDZ
OUTY
C
BOARDY
OUTZ
V
Y
C
1
R
1
V
EN
V
Z
ON
OFF
GND
ON
GND
V
ONY, TH
V
ONZ, TH
t
DELAY
V
EN
t
1
 = -R
1
C
1
 ln(          )
V
EN
 - V
ONY, TH
V
EN
V
ON
V
Y
V
Z
t
0
t
1
t
2
t
2
 = -R
1
C
1
 ln(          )
V
EN
 - V
ONZ, TH
V
EN
t
DELAY
 = -R
1
C
1
 ln(          )
V
EN
 - V
ONY, TH
V
EN
 - V
ONZ, TH
MAX5927A
MAX5929A
MAX5929B
MAX5929C
MAX5929D
Figure 11. Power Sequencing: Channel Z Turns On t
DELAY
After Channel Y
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