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LTC4253IGN Datasheet(PDF) 13 Page - Linear Technology

Part # LTC4253IGN
Description  -48V Hot Swap Controller with Sequencer
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4253IGN Datasheet(HTML) 13 Page - Linear Technology

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LTC4253
13
4253f
OPERATIO
Hot Circuit Insertion
When circuit boards are inserted into a live backplane, the
supply bypass capacitors can draw huge transient cur-
rents from the power bus as they charge. The flow of
current damages the connector pins and glitches the
power bus, causing other boards in the system to reset.
The LTC4253 is designed to turn on a circuit board supply
in a controlled manner, allowing insertion or removal
without glitches or connector damage.
Initial Start-Up
The LTC4253 resides on a removable circuit board and
controls the path between the connector and load or
power conversion circuitry with an external MOSFET switch
(see Figure 1). Both inrush control and short-circuit pro-
tection are provided by the MOSFET.
A detailed schematic is shown in Figure 2. – 48V and
– 48RTN receive power through the longest connector
pins and are the first to connect when the board is inserted.
The GATE pin holds the MOSFET off during this time.
UV/OV determines whether or not the MOSFET should be
turned on based upon internal high accuracy thresholds
and an external divider. UV/OV does double duty by also
monitoring whether or not the connector is seated. The top
of the divider detects – 48RTN by way of a short connector
pin that is the last to mate during the insertion sequence.
LTC4253
–48RTN
4253 F01
PLUG-IN BOARD
–48V
BACKPLANE
+
CLOAD
ISOLATED
DC/DC
CONVERTER
MODULE
LOW
VOLTAGE
CIRCUITRY
+
–
+
–
PWRGD1
VIN
EN2 EN3
VEE
SENSE
GATE
LTC4253
PWRGD2
PWRGD3
RESET
DRAIN
OV/UV
TIMER
SQTIMER
11, 12
3
41
15
2
13
14
SS
6
16
5
10
87
9
4253 F02
+
CT
0.33
µF
CC
18nF
RC
10
Ω
RS
0.02
Ω
Q1
IRF530S
CLOAD
100
µF
TYP
CSQ
0.1
µF
CIN
1
µF
C1
10nF
CSS
68nF
• • •
• • •
• • •
–48RTN
–48V
SHORT
LONG
LONG
R1
402k
1%
R2
32.4k
1%
RD
1M
RIN
10k
20k(1/4W)/2
Figure 2. – 48V/2.5A Hot Swap Controller
Figure 1. Basic LTC4253 Hot Swap Topology



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