LTC4231
Micropower Hot Swap
Controller
FEATURES DESCRIPTION
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Enables Safe Board Insertion and Removal from a The LTC 4231 is a micropower Hot Swap controller that
Power Supply allows safe circuit board insertion and removal from a live
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4A Supply Current power supply. An internal high side switch driver controls
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0.3A Shutdown Current the gate of an external N-channel MOSFET. Back-to-back
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Wide Operating Voltage Range: 2.7V to 36V MOSFETs can be used for reverse supply protection down
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Reverse Supply Protection to 40V to 40V.
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Adjustable Analog Current Limit with Circuit Breaker
The LTC4231 provides a debounce delay and allows the
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Automatic Retry or Latchoff on Current Fault
GATE to be ramped up at an adjustable rate. After start-
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Overvoltage and Undervoltage Monitoring
up, the LTC4231's quiescent current drops to 4A during
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Controls Single or Back-to-Back N-Channel MOSFETs
normal operation with output active. UVL, UVH, OV and
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12-Lead MSOP and 3mm 3mm QFN Packages
GNDSW monitor overvoltage and undervoltage periodi-
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AEC-Q100 Qualified for Automotive Applications
cally, keeping total quiescent current low. Pulling SHDN
low shuts down the LTC4231 and quiescent current drops
to 0.3A.
APPLICATIONS
During an overcurrent fault, the LTC4231 actively limits
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Battery Powered Equipment
current while running an adjustable timer. The LTC4231-1
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Solar Powered Systems
remains off after a current fault while the LTC4231-2 auto-
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Portable Instruments
matically reapplies power after a cool-down period.
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Automotive Battery Protection
All registered trademarks and trademarks are the property of their respective owners.
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Energy Harvesting
TYPICAL APPLICATION
Battery Hot Swap with Reverse Protection Power-Up Waveforms
SMAJ24CA V
22.5m OUT
Si7164DP Si5410DU
24V
CONTACT
IN
2A
BOUNCE
20V/DIV
220F
SENSE GATE
GATE
1020k
20k 20V/DIV
IN SOURCE
UVL STATUS
24V
SOURCE
1.65k
LTC4231
20V/DIV
UVH
I
LOAD
4.22k
5A/DIV
OV SHDN 4231 TA01b
10ms/DIV
32.4k
GNDSW TIMER
GND
180nF
4231 TA01a
Rev. B
1
Document Feedback For more information www.analog.comLTC4231
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Supply Voltage GATESENSE .......................................... 40V to 20V
IN ............................................................ 40V to 40V STATUS ................................................. 0.3V to 40V
Input Voltages TIMER ...................................................... 0.3V to 4V
SENSE, SOURCE ..................................... 40V to 40V Operating Ambient Temperature Range
INSENSE ............................................... 40V to 40V LTC4231C ................................................ 0C to 70C
SHDN, UVL, UVH, OV, GNDSW .............. 0.3V to 40V LTC4231I..............................................40C to 85C
Input Currents LTC4231H .......................................... 40C to 125C
SHDN, UVL, UVH, OV, GNDSW (Note 3) ............1mA Storage Temperature Range .................. 65C to 150C
Output Voltages Lead Temperature (Soldering, 10 sec)
GATESOURCE (Note 4) .........................0.3V to 13V MSOP Package .................................................300C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
12 11 10
SENSE 1 12 GATE
SHDN 1 9 SOURCE
IN 2 11 SOURCE
UVL 2 13 8 TIMER
3
SHDN 10 TIMER
4
UVH STATUS UVL 9 STATUS
3 7
UVH 5 8 GND
OV 6 7 GNDSW
4 5 6
MS PACKAGE
12-LEAD PLASTIC MSOP
T = 150C, = 135C/W
JMAX JA
UD PACKAGE
12-LEAD (3mm 3mm) PLASTIC QFN
T = 150C, = 68C/W
JMAX JA
EXPOSED PAD (PIN 13) PCB CONNECTION TO GND IS OPTIONAL
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4231CUD-1#PBF LTC4231CUD-1#TRPBF LGMX 12-Lead (3mm 3mm) Plastic QFN 0C to 70C
LTC4231CUD-2#PBF LTC4231CUD-2#TRPBF LGSP 12-Lead (3mm 3mm) Plastic QFN 0C to 70C
LTC4231IUD-1#PBF LTC4231IUD-1#TRPBF LGMX 12-Lead (3mm 3mm) Plastic QFN 40C to 85C
LTC4231IUD-2#PBF LTC4231IUD-2#TRPBF LGSP 12-Lead (3mm 3mm) Plastic QFN 40C to 85C
LTC4231HUD-1#PBF LTC4231HUD-1#TRPBF LGMX 12-Lead (3mm 3mm) Plastic QFN 40C to 125C
LTC4231HUD-2#PBF LTC4231HUD-2#TRPBF LGSP 12-Lead (3mm 3mm) Plastic QFN 40C to 125C
LTC4231CMS-1#PBF LTC4231CMS-1#TRPBF 42311 12-Lead Plastic MSOP 0C to 70C
LTC4231CMS-2#PBF LTC4231CMS-2#TRPBF 42312 12-Lead Plastic MSOP 0C to 70C
LTC4231IMS-1#PBF LTC4231IMS-1#TRPBF 42311 12-Lead Plastic MSOP 40C to 85C
LTC4231IMS-2#PBF LTC4231IMS-2#TRPBF 42312 12-Lead Plastic MSOP 40C to 85C
LTC4231HMS-1#PBF LTC4231HMS-1#TRPBF 42311 12-Lead Plastic MSOP 40C to 125C
LTC4231HMS-2#PBF LTC4231HMS-2#TRPBF 42312 12-Lead Plastic MSOP 40C to 125C
Rev. B
2
For more information www.analog.com
OV IN
GNDSW SENSE
GND GATE