LTC4223-2_15 Datasheet, PDF (1/24 Pages) Linear Technology – Dual Supply Hot Swap Controller for Advanced Mezzanine Card

FEATURES
■ _{Allows Safe Insertion into Live AMC or MicroTCA}
Backplane
■ _{Controls 12V Main and 3.3V Auxiliary Supplies}
■ _{Limits Peak Fault Current in ≤1μs}
■ _{Adjustable Current Limit with Circuit Breaker}
■ _{Integrated 0.3Ω AUX Switch}
■ _{High Side Current Sense}
■ _{Gate Drive for External N-Channel MOSFET}
■ _{Adjustable Response Time for Overcurrent Protection}
■ _{Adjustable Supply Voltage Power-Up Rate}
■ _{Thermal Shutdown Protection}
■ _{LTC4223-1: Latch Off After Fault}
■ _{LTC4223-2: Automatic Retry After Fault}
■ _{16-Lead SSOP and 5mm × 4mm DFN Packages}
APPLICATIONS
■ _{Advanced Mezzanine Card, MicroTCA Systems}
■ _{Workstations and Server I/O}
■ _{Telecom Networks}
LTC4223-1/LTC4223-2
Dual Supply Hot Swap
Controller for Advanced
Mezzanine Card
DESCRIPTION
The LTC^®4223 positive voltage Hot Swap^TM controller
allows a board to be safely inserted and removed from
a live AMC or MicroTCA backplane. It controls the main
12V supply with an external N-channel MOSFET and the
3.3V auxiliary supply with an integrated switch. The 12V
output ramp rate is adjustable and includes inrush current
limiting. The 12V output is also protected against short
circuit faults with a fast acting current limit and a 5%
accurate timed circuit breaker. The 3.3V output includes
both soft start and overcurrent protection.
The LTC4223 features a current monitor output for the
12V supply, and reports fault and power-good status for
both supplies. It also detects card presence and allows
independent control of the 12V and auxiliary 3.3V sup-
ply outputs. The LTC4223-1 features a latch-off circuit
breaker, while the LTC4223-2 provides automatic retry
after a fault.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Advanced Mezzanine Card Application
6mΩ
Si7336ADP
12V
12V
7.4A
10Ω
15nF
47Ω
12V_IN 12V_SENSE 12V_GATE
3.3V
AUXIN
51Ω
V_CC
330nF
AUXON
12ON
AUXPGOOD
12PGOOD
FAULT
LTC4223-1/LTC4223-2
IPMC
ADC
12IMON
GND
TIMER
0.1μF
12V_OUT
AUXOUT
3.3V
150mA
EN
422312 TA01a
CARRIER MODULE
CONNECTOR CONNECTOR
Normal Power-Up Waveform
EN
5V/DIV
AUXOUT
5V/DIV
12V_OUT
5V/DIV
AUXPGOOD
5V/DIV
12PGOOD
5V/DIV
20ms/DIV
422312 TA01b
422312f
1