LTC4260
Positive High Voltage
Hot Swap Controller with
2
I C Compatible Monitoring
Fea T Descrip T
n
Allows Safe Board Insertion into Live Backplane The LTC 4260 Hot Swap controller allows a board to be
n
8-Bit ADC Monitors Current and Voltage safely inserted and removed from a live backplane. Using
2
n
I C/SMBus Interface an external N-channel pass transistor, the board supply
2
n
Wide Operating Voltage Range: 8.5V to 80V voltage can be ramped up at an adjustable rate. An I C
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High Side Drive for External N-Channel MOSFET interface and onboard ADC allow monitoring of board
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Input Overvoltage/Undervoltage Protection current, voltage and fault status.
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Optional Latchoff or Autoretry After Faults
The device features adjustable analog foldback current
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Alerts Host After Faults
limit with latch off or automatic restart after the LTC4260
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Foldback Current Limiting
remains in current limit beyond an adjustable time-out
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Available in 24-Lead SO, 24-Lead Narrow
delay.
SSOP and 32-Lead (5mm 5mm) QFN Packages
The controller has additional features to interrupt the host
when a fault has occurred, notify when output power is
a T
good, detect insertion of a load card and power-up in
either the on or off state.
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Electronic Circuit Breakers
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
n
Live Board Insertion
and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
n property of their respective owners.
Computers, Servers
Typical a T
3A, 48V Card Resident Application Power Up Waveforms
0.010
FDB3632
V
OUT C = 1000F
L
48V
48V
+
C V
L IN
43.5k
49.9k 50V/DIV
10
100k
I
IN
2A/DIV
3.57k
0.1F
6.8nF
1.74k
UV V SENSE GATE SOURCE V
DD OUT
2.67k 50V/DIV
*
OV FB
SDAO
BD_PRST
SDA SDAI
LTC4260
SCL SCL GPIO
ADIN
24k
5V/DIV
ALERT ALERT
ON GPIO
INTV
TIMER GND
CC
4260 TA01
4260 TA02
25ms/DIV
0.1F 68nF
GND
BACKPLANE PLUG-IN
CARD
*DIODES INC. SMBT70A
4260fc
1
For more information www.linear.com/LTC4260
CONNECTOR 2
CONNECTOR 1
ion pplica
ions pplica
ion uresLTC4260
a Te Maxi Mu M r a T (Notes 1, 2)
Supply Voltages (V ) .............................0.3V to 100V ALERT, SDAO ............................................ 0.3V to 6.5V
DD
Input Voltages Supply Voltage (INTV ) .......................... 0.3V to 6.2V
CC
SENSE ..............................V 10V or 0.3V to V Operating Temperature Range
DD DD
SOURCE ............................ GATE 5V to GATE + 0.3V LTC4260C ................................................ 0C to 70C
BD_PRST, FB, ON, OV, UV ...................... 0.3V to 12V LTC4260I.............................................. 40C to 85C
ADR0-ADR2, TIMER, ADIN ........0.3V to INTV + 0.3V Storage Temperature Range
CC
SCL, SDAI ............................................ 0.3V to 6.5V GN, SW Packages ..............................65C to 150C
Output Voltages UH Package ....................................... 65C to 125C
GPIO .................................................... 0.3V to 100V Lead Temperature (Soldering, 10 sec)
GATE (Note 3) ..................................... 0.3V to 100V GN, SW Packages Only ..................................... 300C
F T
TOP VIEW
TOP VIEW TOP VIEW
SENSE 1
1 24 GATE 24 GATE
SENSE
32 31 30 29 28 27 26 25
V 2
2 23 SOURCE 23 SOURCE
V DD
DD
NC 1 24 NC
NC 3
3 22 NC 22 NC
NC
NC 2 23 NC
NC 4
4 21 NC 21 NC
UV
NC 3 22 NC
UV 5
5 20 GPIO 20 GPIO
OV
UV 4 21 NC
33
GND 6
6 19 INTV 19 INTV
GND CC
CC
OV 5 20 GPIO
ON 7
7 18 FB 18 FB
ON
GND INTV
6 19
CC
SCL 8
8 17 ADR2 17 ADR2
SCL
ON 7 18 FB
SDAI 9
9 16 ADR1 16 ADR1
SDAI SCL 8 17 ADR2
SDAO 10
10 15 ADR0 15 ADR0
SDAO 9 10 11 12 13 14 15 16
ALERT 11
11 14 BD_PRST 14 BD_PRST
ALERT
TIMER 12
12 13 ADIN 13 ADIN
TIMER
SW PACKAGE
GN PACKAGE UH PACKAGE
24-LEAD PLASTIC SO
24-LEAD PLASTIC SSOP 32-LEAD (5mm 5mm) PLASTIC QFN
T = 125C, = 85C/W
JMAX JA T = 125C, = 75C/W
JMAX JA T = 125C, = 34C/W
JMAX JA
EXPOSED PAD (PIN 33) PCB ELECTRICAL CONNECTION OPTIONAL
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4260CGN#PBF LTC4260CGN#TRPBF LTC4260CGN 24-Lead Plastic SSOP 0C to 70C
LTC4260IGN#PBF LTC4260IGN#TRPBF LTC4260IGN 24-Lead Plastic SSOP 40C to 85C
LTC4260CSW#PBF LTC4260CSW#TRPBF LTC4260CSW 24-Lead Plastic SO 0C to 70C
LTC4260ISW#PBF LTC4260ISW#TRPBF LTC4260ISW 24-Lead Plastic SO 40C to 85C
LTC4260CUH#PBF LTC4260CUH#TRPBF 4260 0C to 70C
32-Lead (5mm 5mm) Plastic QFN
LTC4260IUH#PBF LTC4260IUH#TRPBF 4260 32-Lead (5mm 5mm) Plastic QFN 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.
For more information on lead free part marking, go to: