LTC4216
22
4216fa
For more information www.linear.com/LTC4216
the RESET high when V
OUT
rises above 4.5V. Transient
voltage suppressor, Z1, and snubber network, R
X
and
C
X
, connected at SENSEP pin are highly recommended
to protect the 5V supply system from ringing and voltage
spikes during a fault condition. The RC network, R
Y
and
C
Y
, connected at the V
CC
pin, allows the LTC4216 bias
supply to ride out supply glitches during a fault condition
or adjacent board short.
Auto-Retry after a Fault
As shown in Figure 18, the LTC4216 can be configured to
automatically retry after a fault condition by connecting
both the FAULT and ON pins together with an RC network.
The network has a pull-up resistor, R
AUTO
, tied to the load
supply (V
IN
) and an external capacitor, C
AUTO
, connected
to ground. The auto-retry circuit will attempt to restart
the LTC4216 after a circuit breaker trip, as shown in the
timing diagram of Figure 19. In addition to the cooling
cycle provided by the TIMER period during auto-retry
sequence, the RC time constant for the ON pin voltage to
reach 0.8V provides additional turn-off time to prevent
the external MOSFET from overheating. The auto-retry
duty cycle is given by:
Duty Cycle
t
t
t
t
t
t
SS FILTER
H
+
+
+
+
"
%
100
(20)
where
t
TIMER
= TIMER period as given by Equation (1);
t
OFF
= time taken to charge the capacitor, C
AUTO
, from
Figure 16. PCB Connection Sensing with ON/OFF Control
Figure 17. 5V Hot Swap Application
SENSEP SENSEN
GATE
ON
TIMER
FB
FAULT
RESET
FAULT
RESET
SS
11
10
9
8
7
12
1
4
2
5
3
6
FILTER
LTC4216
R1
5.62k
1%
R5
39.2k
1%
R7
10k
R4
10k
1%
R2
4.42k
1%
R3
20k 1%
R8
10k
C
Y
330nF
C
X
100nF
LONG
BACKPLANE
CONNECTOR
(FEMALE)
PCB EDGE
CONNECTOR
(MALE)
GND
LONG
SHORT
SHORT
SHORT
C1
10nF
C2
4.7nF
C3
33nF
V
OUT
3.3V
5A
V
IN
3.3V
ON/RST
ON/OFF
GND
M1
Si4864DY
R6
10k
+
C
LOAD
1000礔
LONG
V
CC
5V
礟
LOGIC
4216 F16
V
CC
Z1
M2
M3
Z1: SMAJ6.0A
M2, M3: 2N7002K
PCB CONNECTION SENSING
R
SENSE
0.004
R
Y
22
R
X
10
SENSEP SENSEN GATE
ON
FB
FAULT
RESET
FAULT
RESET
SS
11
10
9
8
7
12
1
4
2
5
3
6
FILTER
LTC4216
R4
64.9k
1%
R6
10k
R3
10k
1%
R1
20k
1%
C
Y
330nF
C
Z
10nF
C
X
100nF
R2
80.6k
1%
LONG
SHORT
LONG
BACKPLANE
CONNECTOR
(FEMALE)
PCB EDGE
CONNECTOR
(MALE)
GND
C1
10nF
C2
4.7nF
C3
22nF
V
OUT
5V
5A
V
IN
5V
GND
M1
Si4864DY
R5
10k
+
C
LOAD
470礔
礟
LOGIC
4216 F17
V
CC
Z1: SMAJ6.0A
TIMER
Z1
R
SENSE
0.004
R
Z
100
R
Y
22
R
X
10
applicaTions inForMaTion
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