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Linear Technology Electronic Components Datasheet

LTC4245IUHF Datasheet

Multiple Supply Hot Swap Controller

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FEATURES
Allows Safe Insertion into Live CompactPCITM or
PCI ExpressTM Backplane
8-Bit ADC Monitors Current and Voltage
I2CTM/SMBus Interface
dI/dt Controlled Soft Start
Simultaneous or Sequenced Turn-On
±20V Absolute Maximum Rating for ±12V Supplies
No External Gate Capacitor Required
Dual-Level Circuit Breaker and Current Limit
Bus Precharge Output
Power Good Input with Timeout
Optional Latchoff or Autoretry After Faults
Alerts Host After Faults
Integrated LOCAL_PCI_RST# Logic
36-Pin SSOP and 38-Pin (5mm × 7mm) QFN
Packages
U
APPLICATIO S
Live Board Insertion
CompactPCI, CompactPCI Express, CompactTCA,
PCI Express Systems
LTC4245
Multiple Supply Hot Swap
Controller with I2C
Compatible Monitoring
DESCRIPTIO
The LTC®4245 Hot SwapTM controller allows a board to
be safely inserted and removed from a live backplane in
multiple supply systems such as CompactPCI and PCI
Express. Using four external N-channel pass transistors,
the board supply voltages can be ramped up at an adjust-
able rate and in any desired sequence. An I2C interface and
onboard ADC allow monitoring of board current, voltage
and fault status for each supply.
The device features adjustable dI/dt controlled soft start
and foldback limited inrush current. A dual-level timed
circuit breaker and fast current limit protect each supply
against overcurrent faults. A power good input with timeout
allows a downstream supply monitor to disconnect the
board supplies. The device can be configured to function
without a –12V supply or with an extra 3.3V supply instead
of a 5V supply.
The controller has additional features to interrupt the host
when a fault has occurred, notify when output power is
good, detect insertion of a load card and power-up in
either the on or off state.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
CompactPCI Application
BACKPLANE CARD
CONNECTOR CONNECTOR
5VOUT
12VOUT
Sequenced Turn-On Waveform
BD_SEL#
10V/DIV
12VIN 12VSENSE 12VGATE 12VOUT 5VIN 5VSENSE 5VGATE
BD_SEL#
5VOUT
ON
HEALTHY#
SDA
SCL
ALERT#
PCI_RST#
LTC4245
PGI
LOCAL_PCI_RESET#
PRECHARGE
GND
3VOUT
VEEIN VEESENSE VEEGATE VEEOUT 3VIN 3VSENSE 3VGATE
SUPPLY
MONITOR
RESET
BOARD
RESET
TO BUS
–12VOUT
3.3VOUT
OUTPUT
VOLTAGE
5V/DIV
LOCAL_PCI_RST#
5V/DIV
12VOUT
5VOUT
3VOUT
VEEOUT
TIME (50ms/DIV)
4245 TA01b
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1


Linear Technology Electronic Components Datasheet

LTC4245IUHF Datasheet

Multiple Supply Hot Swap Controller

No Preview Available !

LTC4245 www.DataSheet4U.com
ABSOLUTE AXI U RATI GS
(Notes 1, 2)
Supply Voltages
12VIN ..................................................... –0.3V to 20V
5VIN, 3VIN .............................................. –0.3V to 10V
VEEIN ...................................................... –20V to 0.3V
INTVCC .................................................. –0.3V to 6.5V
Input Voltages
BD_SEL#, ON, PGI................................. –0.3V to 12V
ADR0-3, CFG, SS, TIMER ...... –0.3V to INTVCC + 0.3V
PCI_RST#, SCL, SDA............................ –0.3V to 6.5V
Output Voltages
ALERT#, GPIO1-3, HEALTHY#,
LOCAL_PCI_RST# ................................ –0.3V to 6.5V
Analog Voltages (n is 5V, 3V)
12VGATE ................................................. –0.3V to 25V
nGATE (Note 3)............... –0.3V to 12VIN + 0.3V or 14V
UW U
PACKAGE/ORDER I FOR ATIO
VEEGATE – VEEIN (Note 4) .......................... –0.3V to 5V
12VSENSE ........... –0.3V or 12VIN – 6V to 12VIN + 0.3V
nSENSE...........................................–0.3V to nIN + 0.3V
VEESENSE ..................................... VEEIN – 0.3V to 0.3V
12VOUT – 12VGATE (Note 4)...................... –5V to 0.3V
nOUT nGATE (Note 4) .............................. –5V to 0.3V
VEEOUT (Note 5)...................................... –20V to 0.3V
PRECHARGE.............................. –0.3V to 3VIN + 0.3V
Operating Temperature Range
LTC4245C ................................................ 0°C to 70°C
LTC4245I ............................................. –40°C to 85°C
Storage Temperature Range
G Package.......................................... –65°C to 150°C
UHF Package...................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
G Package......................................................... 300°C
TOP VIEW
HEALTHY# 1
TIMER 2
ON 3
SS 4
12VIN 5
12VSENSE 6
12VGATE 7
12VOUT 8
GND 9
BD_SEL# 10
CFG 11
SDA 12
SCL 13
ALERT# 14
VEESENSE 15
VEEIN 16
VEEGATE 17
VEEOUT 18
36 5VIN
35 5VSENSE
34 5VGATE
33 5VOUT
32 ADR3
31 ADR2
30 ADR1
29 ADR0
28 INTVCC
27 GPIO1
26 PGI
25 PCI_RST#
24 LOCAL_PCI_RST#
23 PRECHARGE
22 3VIN
21 3VSENSE
20 3VGATE
19 3VOUT
G PACKAGE
36-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
TOP VIEW
SS 1
12VIN 2
12VSENSE 3
12VGATE 4
12VOUT 5
GND 6
BD_SEL# 7
CFG 8
SDA 9
SCL 10
ALERT# 11
VEESENSE 12
38 37 36 35 34 33 32
39
13 14 15 16 17 18 19
31 ADR3
30 ADR2
29 ADR1
28 ADR0
27 INTVCC
26 GPIO3
25 GPIO2
24 GPIO1
23 PGI
22 PCI_RST#
21 LOCAL_PCI_RST#
20 PRECHARGE
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 39) PCB GND CONNECTION OPTIONAL
ORDER PART NUMBER
ORDER PART NUMBER
UHF PART MARKING*
LTC4245CG
LTC4245IG
LTC4245CUHF
4245
LTC4245IUHF
4245
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
4245fa
2


Part Number LTC4245IUHF
Description Multiple Supply Hot Swap Controller
Maker Linear
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LTC4245IUHF Datasheet PDF






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