LTC4226
Wide Operating Range
Dual Hot Swap Controller
Fea T Descrip T
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Allows Safe Board Insertion into Live Backplane The LTC 4226 dual Hot Swap controller allows two
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Selectable Current Limit and Dual-Rate Timer power paths to be safely inserted and removed from a
Accommodate Load Surges live backplane or powered connector. Using N-channel
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Fast Response Limits Peak Fault Current pass transistors, supply voltages ranging from 4.5V to
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Wide Operating Voltage Range: 4.5V to 44V 44V are ramped up at an adjustable rate.
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Optional Auto-Retry or Latchoff after
Three selectable ratios of current limit to circuit breaker
Overcurrent Fault
threshold accommodate noisy loads and momentary high
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High Side Drive for External N-Channel MOSFET
peak currents without interruption, while a dual-rate fault
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Allows Parallel Power Paths for High Current
timer protects the MOSFET from extended output over-
Applications
current events. FAULT outputs indicate the circuit breaker
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Available in 16-Pin QFN (3mm 3mm) and MSOP
status. The LTC4226-1 remains off after a fault while the
Packages
LTC4226-2 automatically retries after a 0.5s delay.
The LTC4226 can also be configured as a bidirectional cur-
a T
rent limiter/circuit breaker. For high current applications,
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Apple FireWire/IEEE 1394 two channels may be configured as parallel power paths.
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Disk Drives L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of
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Rugged 12V, 24V Applications
their respective owners.
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Hot Board/Connector Insertion
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Uni/Bidirectional Current Limiter/Circuit Breaker
Typical a T
2 Port FireWire Application
PORT 1
1394 1394
SS3P5
SOCKET PLUG
30m
FDMS86500DC
Inrush after Load Connection
7V TO 33V
V
CC
10V/DIV
V SENSE1 GATE1 OUT1
CC1
CABLE INSERTION
ON1 FTMR1
V
220nF
FAULT1 OUT
CURRENT
10V/DIV
LIMIT CLS LTC4226-2 GND
SELECT
FAULT2
220nF
ON2 FTMR2
INRUSH
I
OUT
V SENSE2 GATE2 OUT2 PORT 2
CC2 CURRENT
1A/DIV
1394 1394
SOCKET PLUG
4226 TA01b
FDMS86500DC 1ms/DIV
30m
SMCJ33A*
V = 12V
CC
C = 1mF
LOAD
4226 TA01a
*36.7V TO 40.6V BV
4226f
1
ion pplica
ions pplica
ion uresLTC4226
a T e Maxi Mu M r a T
(Notes 1, 2)
V ........................................................... 0.3V to 55V Operating Ambient Temperature Range
CCn
SENSEn, ONn, FAULTn, CLS ....................... 0.3V to 55V LTC4226C ................................................ 0C to 70C
GATEn (Note 3) .......................................... 0.3V to 68V LTC4226I .............................................40C to 85C
OUTn (Note 3) ............................................ 0.3V to 55V Storage Temperature Range .................. 65C to 150C
GATEn OUTn (Note 3) ............................. 0.3V to 18V MSOP Lead Temperature (Soldering, 10 sec) ........300C
FTMRn ......................................................... 0.3V to 4V
p c F T
TOP VIEW
TOP VIEW
16 15 14 13
FAULT1 1 16 FAULT2
V 1 12 V
CC1 CC2 ON1 2 15
ON2
V 3 14 V
SENSE1 2 11 SENSE2 CC1 CC2
SENSE1 4 13 SENSE2
17
GATE1 GATE2
3 10 GATE1 5 12 GATE2
OUT1 6 11 OUT2
OUT1 4 9 OUT2
FTMR1 7 10 FTMR2
GND 8 9 CLS
5 6 7 8
MS PACKAGE
16-LEAD PLASTIC MSOP
T = 125C, = 120C/W
JMAX JA
UD PACKAGE
16-LEAD (3mm 3mm) PLASTIC QFN
T = 125C, = 68C/W
JMAX JA
EXPOSED PAD (PIN 17), PCB GND CONNECTION OPTIONAL
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4226CUD-1#PBF LTC4226CUD-1#TRPBF LFRC 16-Lead (3mm 3mm) Plastic QFN 0C to 70C
LTC4226CUD-2#PBF LTC4226CUD-2#TRPBF LFRD 0C to 70C
16-Lead (3mm 3mm) Plastic QFN
LTC4226IUD-1#PBF LTC4226IUD-1#TRPBF LFRC 16-Lead (3mm 3mm) Plastic QFN 40C to 85C
LTC4226IUD-2#PBF LTC4226IUD-2#TRPBF LFRD 16-Lead (3mm 3mm) Plastic QFN 40C to 85C
LTC4226CMS-1#PBF LTC4226CMS-1#TRPBF 42261 16-Lead Plastic MSOP 0C to 70C
LTC4226CMS-2#PBF LTC4226CMS-2#TRPBF 42262 16-Lead Plastic MSOP 0C to 70C
LTC4226IMS-1#PBF LTC4226IMS-1#TRPBF 42261 16-Lead Plastic MSOP 40C to 85C
LTC4226IMS-2#PBF LTC4226IMS-2#TRPBF 42262 16-Lead Plastic MSOP 40C to 85C
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 nonstandard lead based finish parts.
For more information on lead free part marking, go to: