LTC4210 LINER [Linear Technology], LTC4210 Datasheet - Page 10

• Manufacturer Part Number: LTC4210
• Description: Dual Supply Hot Swap Controller for Advanced Mezzanine Card
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
LTC4223-1/LTC4223-2
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.
10
MANAGEMENT
CONTROLLER
INTELLIGENT
PLATFORM
RESET
MP ENABLE
PWR ENABLE
MP GOOD
PWR GOOD
FAULT
3.3V
3
2.2k
PRESENCE
Figure 1. Advanced Mezzanine Card/MicroTCA Application
3.3V
12V
BYPASS CAPACITOR
BYPASS CAPACITOR
*OPTIONAL
7
6
1
BULK SUPPLY
BULK SUPPLY
CLK
D OUT
CS
V
3.3V
REF
LTC1197L
4
5
GND
R6*
10k
3.3V
V
CC
8
R5*
10k
+IN
–IN
3.3V
1μF
R2
51Ω
R4*
10k
2
3
C2
330nF
3.3V
11
14
13
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 R
12V load current for fault detection and current sensing
information. GATE capacitor C
control to limit the inrush current. Resistor R
compensates the current control loop while R3 prevents
parasitic oscillations in Q1.
5
6
7
4
3
AUXIN
V
AUXON
12ON
AUXPGOOD
12PGOOD
FAULT
12IMON
12V
CC
IN
2
6mΩ
R
S
12V
GND
SENSE
8
1
LTC4223-1
10Ω
Si7336ADP
R3
12V
9
TIMER
Q1
GATE
16
47Ω
C
0.1μF
R
T
G
15nF
C
AUXOUT
12V
G
422312 F01
OUT
EN
G
provides gate slew rate
15
12
10
ENABLE
CARRIER AMC
CONNECTOR
PWR
PS1
PS0
MP
S
monitors the
MODULE AMC
CONNECTOR
G
with C
3.3V
12V
7.4A
3.3V
150mA
422312f
10k
G