LTC4223-1/LTC4223-2
Dual Supply Hot Swap
Controller for Advanced
Mezzanine Card
FEATURES DESCRIPTION
TM
Allows Safe Insertion into Live AMC or MicroTCA
The LTC 4223 positive voltage Hot Swap controller
Backplane
allows a board to be safely inserted and removed from
Controls 12V Main and 3.3V Auxiliary Supplies
a live AMC or MicroTCA backplane. It controls the main
Limits Peak Fault Current in 1s
12V supply with an external N-channel MOSFET and the
Adjustable Current Limit with Circuit Breaker
3.3V auxiliary supply with an integrated switch. The 12V
Integrated 0.3 AUX Switch
output ramp rate is adjustable and includes inrush current
High Side Current Sense
limiting. The 12V output is also protected against short
Gate Drive for External N-Channel MOSFET
circuit faults with a fast acting current limit and a 5%
Adjustable Response Time for Overcurrent Protection
accurate timed circuit breaker. The 3.3V output includes
Adjustable Supply Voltage Power-Up Rate
both soft start and overcurrent protection.
Thermal Shutdown Protection
The LTC4223 features a current monitor output for the
LTC4223-1: Latch Off After Fault
12V supply, and reports fault and power-good status for
LTC4223-2: Automatic Retry After Fault
both supplies. It also detects card presence and allows
16-Lead SSOP and 5mm 4mm DFN Packages
independent control of the 12V and auxiliary 3.3V sup-
ply outputs. The LTC4223-1 features a latch-off circuit
APPLICATIONS
breaker, while the LTC4223-2 provides automatic retry
Advanced Mezzanine Card, MicroTCA Systems
after a fault.
Workstations and Server I/O
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Telecom Networks
TYPICAL APPLICATION
Advanced Mezzanine Card Application Normal Power-Up Waveform
6m Si7336ADP
12V EN
12V
7.4A
5V/DIV
AUXOUT
15nF
10
5V/DIV
47
12V 12V 12V 12V 12V
IN SENSE GATE OUT OUT
5V/DIV
3.3V
3.3V AUXIN AUXOUT
150mA
51 AUXPGOOD
5V/DIV
V
CC
12PGOOD
330nF
5V/DIV
LTC4223-1/LTC4223-2
AUXON
12ON
AUXPGOOD
20ms/DIV
422312 TA01b
12PGOOD
FAULT
IPMC
12IMON
ADC
EN
GND TIMER
422312 TA01a
0.1F
CARRIER MODULE
CONNECTOR CONNECTOR
422312f
1LTC4223-1/LTC4223-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
12V ................................................. 0.3V to 25V
GATE
Supply Voltages
12V - 12V (Note 3) ................... 4.5V to 0.3V
OUT GATE
12V ..................................................... 0.3V to 20V
IN AUXOUT ................................................. 0.3V to 10V
AUXIN .................................................... 0.3V to 10V
Operating Temperature Range
V ........................................................... 0.3V to 7V
CC LTC4223-1C/ LTC4223-2C ....................... 0C to 70C
Input Voltages
LTC4223-1I/ LTC4223-2I ..................... 40C to 85C
12ON, AUXON, EN ................................... 0.3V to 7V
Storage Temperature Range
TIMER ..........................................0.3V to V + 0.3V
CC GN Package ....................................... 65C to 150C
12V ............................................... 0.3V to 20V
SENSE DHD Package ..................................... 65C to 125C
Output Voltages
Lead Temperature (Soldering, 10sec)
FAULT, 12PGOOD, AUXPGOOD,
GN Package ......................................................300C
12IMON ................................................... 0.3V to 7V
PIN CONFIGURATION
TOP VIEW
TOP VIEW
12V 1 16 12V
SENSE GATE
12V 1 16 12V
SENSE GATE
12V 2 15 12V
IN OUT
12V 2 15 12V
IN OUT
12IMON 3 14 12PGOOD
12IMON 3 14 12PGOOD
12ON 4 13 FAULT
17
12ON 4 13 FAULT
AUXIN 5 12 AUXOUT
AUXIN 5 12 AUXOUT
V 6 11 AUXPGOOD
CC
V 6 11 AUXPGOOD
CC
AUXON 7 10 EN
AUXON 7 10 EN
GND 8 9 TIMER
GND 8 9 TIMER
DHD PACKAGE
GN PACKAGE 16-LEAD (5mm 4mm) PLASTIC DFN
16-LEAD PLASTIC SSOP
EXPOSED PAD (PIN 17) PCB GND CONNECTION OPTIONAL
T = 125C, = 110C/W
JMAX JA MUST BE SOLDERED TO PCB TO OBTAIN
= 43C/W, OTHERWISE = 140C/W, T = 125C
JA JA JMAX
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4223CDHD-1#PBF LTC4223CDHD-1#TRPBF 42231 16-Lead (5mm 4mm) Plastic DFN 0C to 70C
LTC4223CDHD-2#PBF LTC4223CDHD-2#TRPBF 42232 16-Lead (5mm 4mm) Plastic DFN 0C to 70C
LTC4223IDHD-1#PBF LTC4223IDHD-1#TRPBF 42231 16-Lead (5mm 4mm) Plastic DFN 40C to 85C
LTC4223IDHD-2#PBF LTC4223IDHD-2#TRPBF 42232 16-Lead (5mm 4mm) Plastic DFN 40C to 85C
LTC4223CGN-1#PBF LTC4223CGN-1#TRPBF 42231 16-Lead Plastic SSOP 0C to 70C
LTC4223CGN-2#PBF LTC4223CGN-2#TRPBF 42232 16-Lead Plastic SSOP 0C to 70C
LTC4223IGN-1#PBF LTC4223IGN-1#TRPBF 4223I1 16-Lead Plastic SSOP 40C to 85C
LTC4223IGN-2#PBF LTC4223IGN-2#TRPBF 4223I2 16-Lead Plastic SSOP 40C to 85C
Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based nish parts.
For more information on lead free part marking, go to: