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LTC4223CDHD-2 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4223CDHD-2
Description  Dual Supply Hot Swap Controller for Advanced Mezzanine Card
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4223CDHD-2 Datasheet(HTML) 10 Page - Linear Technology

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LTC4223-1/LTC4223-2
10
422312f
The typical LTC4223 application is in a Carrier board
for Advanced Mezzanine Cards (AMC), delivering 3.3V
auxiliary and 12V power to the AMC module. A control-
ler on the Carrier board sequences the turn-on of power
supplies and manages the fault and power-good reports
from the LTC4223.
The LTC4223 detects board presence during insertion and
extraction, allowing power to be delivered in a controlled
manner without damaging the connector. The typical
LTC4223 application circuit is shown in Figure 1. External
component selection is discussed in detail in the Design
Example section.
APPLICATIONS INFORMATION
Turn-On Sequence
The power supplies delivered to an AMC module are
controlled by the external N-channel pass transistor, Q1 in
the 12V power path and an internal pass transistor in the
3.3V auxiliary power path. Sense resistor RS monitors the
12V load current for fault detection and current sensing
information. GATE capacitor CG provides gate slew rate
control to limit the inrush current. Resistor RG with CG
compensates the current control loop while R3 prevents
parasitic oscillations in Q1.
422312 F01
12VOUT
12VSENSE 12VGATE
12VIN
VCC
AUXIN
AUXOUT
EN
AUXON
12ON
AUXPGOOD
12PGOOD
FAULT
12V
5
21
16
15
12
10
89
6
7
4
11
13
3
58
2
3
4
7
6
1
14
3.3V
RS
6m
Ω
Q1
Si7336ADP
PWR
MP
PS1
PS0
CARRIER AMC
CONNECTOR
MODULE AMC
CONNECTOR
TIMER
LTC4223-1
GND
12V
7.4A
3.3V
150mA
R3
10
Ω
R2
51
Ω
MP ENABLE
PWR ENABLE
MP GOOD
PWR GOOD
FAULT
C2
330nF
BULK SUPPLY
BYPASS CAPACITOR
CT
0.1
μF
1
μF
RG
47
Ω
CG
15nF
3.3V
3.3V
INTELLIGENT
PLATFORM
MANAGEMENT
CONTROLLER
ENABLE
PRESENCE
RESET
12IMON
R4*
10k
2.2k
*OPTIONAL
3.3V
10k
R5*
10k
R6*
10k
3.3V
3.3V
3.3V
BULK SUPPLY
BYPASS CAPACITOR
LTC1197L
VREF
CLK
DOUT
CS
+IN
–IN
VCC
GND
3
Figure 1. Advanced Mezzanine Card/MicroTCA Application



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