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Linear Technology Electronic Components Datasheet

LTC4224CMS-1 Datasheet

Compact Dual Low Voltage Hot Swap Controller

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LTC4224-1/LTC4224-2
Compact Dual Low
Voltage Hot Swap Controller
FEATURES
n Allows Safe Board Insertion and Removal from a
Live Backplane
n Controls Load Voltages from 1V to 6V
n No Gate Components Required
n Adjustable Current Limit with Circuit Breaker
n Limits Peak Fault Current in ≤1μs
n No External Timing Capacitor Required
n Adjustable Supply Voltage Power-Up Rate
n Gate Drive for External N-channel MOSFET
n LTC4224-1: Latchoff After Fault
n LTC4224-2: Automatic Retry After Fault
n 10-Lead MSOP and 3mm × 2mm DFN Packages
APPLICATIONS
n Optical Networking
n Low Voltage Hot Swap
n Electronic Circuit Breakers
DESCRIPTION
The LTC®4224 Dual Low Voltage Hot Swap™ controller
allows a board to be safely inserted and removed from a
live backplane. It controls two supplies with external N-
channel MOSFETs and operates with one supply as low
as 1V provided the other supply is 2.7V or greater. The
LTC4224 can ramp up the supplies in any order and at
adjustable ramp rates. To minimize the number of external
components and PCB area, the gate capacitor is optional,
all timing delays are generated internally, and the ON pins
have integrated pull-up currents.
Protection against overcurrent faults is provided by a fast-
acting current limit and timed circuit breakers. A FAULT pin
signals overcurrent faults. The LTC4224-1 remains off after
a fault, while the LTC4224-2 automatically tries to apply
power again after a four second cool-down period.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
FDS6911
0.015Ω
5V
5V
1A
0.010Ω
3.3V
3.3V
2A
VCC1 SENSE1 VCC2 SENSE2 GATE1 GATE2
ON1
LTC4224
LTC4224
ON2
FAULT
GND
GND
CONNECTOR PLUG-IN
CARD
422412 TA01a
Normal Power-Up Waveform
VOUT1
5V/DIV
VOUT2
5V/DIV
IIN1
2A/DIV
IIN2
2A/DIV
0.5ms/DIV
CLOAD = 150μF
422412 TA01b
422412fa
1


Linear Technology Electronic Components Datasheet

LTC4224CMS-1 Datasheet

Compact Dual Low Voltage Hot Swap Controller

No Preview Available !

wwwL.DTataCShe4et42U.c2om4-1/LTC4224-2
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Supply Voltage (VCCn).................................. –0.3V to 9V
Input Voltages
SENSEn, ONn........................................... –0.3V to 9V
Output Voltages
GATEn – VCC (Note 4) .............................. –0.3V to 5V
FAULT....................................................... –0.3V to 9V
Operating Temperature Range
LTC4224C ................................................ 0°C to 70°C
LTC4224I.............................................. –40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature Range (Soldering, 10 sec)
MSOP Package ................................................. 300°C
PIN CONFIGURATION
TOP VIEW
SENSE1 1
VCC1 2
GATE1 3
FAULT 4
ON1 5
10 SENSE2
9 VCC2
11 8 GATE2
7 GND
6 ON2
DDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
SENSE1 1
VCC1 2
GATE1 3
FAULT 4
ON1 5
TOP VIEW
10 SENSE2
9 VCC2
8 GATE2
7 GND
6 ON2
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4224CDDB-1#PBF
LTC4224CDDB-1#TRPBF LDTT
10-Lead (3mm × 2mm) Plastic DFN 0°C to 70°C
LTC4224CDDB-2#PBF
LTC4224CDDB-2#TRPBF LDNV
10-Lead (3mm × 2mm) Plastic DFN 0°C to 70°C
LTC4224IDDB-1#PBF
LTC4224IDDB-1#TRPBF LDTT
10-Lead (3mm × 2mm) Plastic DFN –40°C to 85°C
LTC4224IDDB-2#PBF
LTC4224IDDB-2#TRPBF LDNV
10-Lead (3mm × 2mm) Plastic DFN –40°C to 85°C
LTC4224CMS-1#PBF
LTC4224CMS-1#TRPBF LTDTV
10-Lead Plastic MSOP
0°C to 70°C
LTC4224CMS-2#PBF
LTC4224CMS-2#TRPBF LTDNW
10-Lead Plastic MSOP
0°C to 70°C
LTC4224IMS-1#PBF
LTC4224IMS-1#TRPBF LTDTV
10-Lead Plastic MSOP
–40°C to 85°C
LTC4224IMS-2#PBF
LTC4224IMS-2#TRPBF LTDNW
10-Lead Plastic MSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
422412fa
2


Part Number LTC4224CMS-1
Description Compact Dual Low Voltage Hot Swap Controller
Maker Linear
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