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LTC4245IG#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LTC4245
1
4245fa
Multiple Supply Hot Swap
Controller with I
2
C
Compatible Monitoring
The LTC
®
4245 Hot Swap
TM
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 I
2
C 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 confi gured 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.
■
Live Board Insertion
■
CompactPCI, CompactPCI Express, CompactTCA,
PCI Express Systems
■
Allows Safe Insertion into Live CompactPCI
TM
or
PCI Express
TM
Backplane
■
8-Bit ADC Monitors Current and Voltage
■
I
2
C
TM
/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
Sequenced Turn-On Waveform
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
V
EEIN
GND
PCI_RST#
ALERT#
SCL
SDA
HEALTHY#
BOARD
RESET
SUPPLY
MONITOR
RESET
–12V
OUT
TO BUS
5V
OUT
12V
OUT
3.3V
OUT
CARD
CONNECTOR
BACKPLANE
CONNECTOR
BD_SEL#
12V
IN
3V
OUT
PRECHARGE
LOCAL_PCI_RESET#
LTC4245
PGI
ON
5V
OUT
12V
SENSE
12V
GATE
12V
OUT
5V
IN
5V
SENSE
5V
GATE
V
EESENSE
V
EEGATE
V
EEOUT
3V
IN
3V
SENSE
3V
GATE
CompactPCI Application
OUTPUT
VOLTAGE
5V/DIV
4245 TA01b
LOCAL_PCI_RST#
5V/DIV
TIME (50ms/DIV)
BD_SEL#
10V/DIV
V
EEOUT
5V
OUT
3V
OUT
12V
OUT
LTC4245
2
4245fa
Supply Voltages
12V
IN
..................................................... –0.3V to 20V
5V
IN
, 3V
IN
.............................................. –0.3V to 10V
V
EEIN
...................................................... –20V to 0.3V
INTV
CC
.................................................. –0.3V to 6.5V
Input Voltages
BD_SEL#, ON, PGI ................................. –0.3V to 12V
ADR0-3, CFG, SS, TIMER ...... –0.3V to INTV
CC
+ 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)
12V
GATE
................................................. –0.3V to 25V
n
GATE
(Note 3) ............... –0.3V to 12V
IN
+ 0.3V or 14V
(Notes 1, 2)
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TOP VIEW
G PACKAGE
36-LEAD PLASTIC SSOP
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
HEALTHY#
TIMER
ON
SS
12V
IN
12V
SENSE
12V
GATE
12V
OUT
GND
BD_SEL#
CFG
SDA
SCL
ALERT#
V
EESENSE
V
EEIN
V
EEGATE
V
EEOUT
5V
IN
5V
SENSE
5V
GATE
5V
OUT
ADR3
ADR2
ADR1
ADR0
INTV
CC
GPIO1
PGI
PCI_RST#
LOCAL_PCI_RST#
PRECHARGE
3V
IN
3V
SENSE
3V
GATE
3V
OUT
T
JMAX
= 125°C, θ
JA
= 95°C/W
13 14 15 16
TOP VIEW
39
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1SS
12V
IN
12V
SENSE
12V
GATE
12V
OUT
GND
BD_SEL#
CFG
SDA
SCL
ALERT#
V
EESENSE
ADR3
ADR2
ADR1
ADR0
INTV
CC
GPIO3
GPIO2
GPIO1
PGI
PCI_RST#
LOCAL_PCI_RST#
PRECHARGE
ON
TIMER
HEALTHY#
5V
IN
5V
SENSE
5V
GATE
5V
OUT
V
EEIN
V
EEGATE
V
EEOUT
3V
OUT
3V
GATE
3V
SENSE
3V
IN
23
22
21
20
9
10
11
12
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) PCB GND CONNECTION OPTIONAL
ORDER PART NUMBER ORDER PART NUMBER UHF PART MARKING*
LTC4245CG
LTC4245IG
LTC4245CUHF
LTC4245IUHF
4245
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 specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
V
EEGATE
– V
EEIN
(Note 4) .......................... –0.3V to 5V
12V
SENSE
........... –0.3V or 12V
IN
– 6V to 12V
IN
+ 0.3V
n
SENSE
...........................................–0.3V to n
IN
+ 0.3V
V
EESENSE
..................................... V
EEIN
– 0.3V to 0.3V
12V
OUT
– 12V
GATE
(Note 4) ...................... –5V to 0.3V
n
OUT
– n
GATE
(Note 4) .............................. –5V to 0.3V
V
EEOUT
(Note 5) ...................................... –20V to 0.3V
PRECHARGE .............................. –0.3V to 3V
IN
+ 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
LTC4245
3
4245fa
The ● denotes the specifi cations which apply over the full operating temperature
range, otherwise specifi cations are at T
A
= 25°C. V
12VIN
= 12V, V
5VIN
= 5V, V
3VIN
= 3.3V, V
VEEIN
= –12V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
I
DD
Input Supply Current 12V
IN
5V
IN
3V
IN
,
PRECHARGE Open
V
EEIN
●
●
●
●
3
0.5
0.6
–0.5
5
1
1
–1
mA
mA
mA
mA
V
UVL
Supply Undervoltage Lockout 12V
IN
5V
IN
, V
CFG
= 0V, Open
5V
IN
When V
CFG
= V
CC
, 3V
IN
V
EEIN
, V
CFG
= 0V
V
CC
Falling
●
●
●
●
●
10.2
4.25
2.7
–10.2
3.4
10.5
4.38
2.8
–10.5
3.8
10.8
4.5
2.9
–10.8
4.2
V
V
V
V
V
V
CC
Internal Regulator Voltage
●
5 5.5 6 V
Current Limit
ΔV
SNS(CB)
Circuit Breaker Trip Sense Voltage
(V
12VIN
– V
12VSENSE
)
(V
5VIN
– V
5VSENSE
)
(V
3VIN
– V
3VSENSE
)
(V
VEESENSE
– V
VEEIN
)
After Start-Up
●
●
●
●
45
22.5
22.5
40
50
25
25
50
55
27.5
27.5
60
mV
mV
mV
mV
ΔV
SNS(ACL)
Active Current Limit Sense Voltage
(V
12VIN
– V
12VSENSE
)
(V
5VIN
– V
5VSENSE
)
(V
3VIN
– V
3VSENSE
)
(V
VEESENSE
– V
VEEIN
)
After Start-Up
●
●
●
●
130
60
60
130
150
75
75
150
170
90
90
170
mV
mV
mV
mV
ΔV
SNS(FBL)
,
ΔV
SNS(FBH)
Foldback Current Limit Sense Voltage
(V
12VIN
– V
12VSENSE
)
(V
5VIN
– V
5VSENSE
)
(V
3VIN
– V
3VSENSE
)
(V
VEESENSE
– V
VEEIN
)
Start-Up, V
TIMER
= 0V
V
12VOUT
= 0V
V
12VOUT
= 12V
V
5VOUT
= 0V
V
5VOUT
= 5V
V
3VOUT
= 0V
V
3VOUT
= 3.3V
V
VEEOUT
= 0V
V
VEEOUT
= –12V
●
●
●
●
●
●
●
●
10
40
4
22
4
22
11
40
15
50
7.5
25
7.5
25
16
50
20
60
11
29
11
29
21
60
mV
mV
mV
mV
mV
mV
mV
mV
Gate Drive
ΔV
GATE
Gate Drive Gate to Source
●
5 6.2 7.5 V
I
GATE(UP)
Gate Pull-Up Current Gate Drive On, ΔV
GATE
= 0V
●
–16 –20 –24 μA
I
GATE(DN)
Gate Pull-Down Current
12V
GATE
, 5V
GATE
, 3V
GATE
,
V
EEGATE
Gate Drive Off, ΔV
GATE
= 5V
V
OUT
= V
IN
V
VEEGATE
= –7V
●
●
0.9
1.7
1.3
3.5
1.7
5.3
mA
mA
I
GATE(FST)
Gate Fast Pull-Down Current
12V
GATE
, 5V
GATE
3V
GATE
V
EEGATE
Fast Turn Off, ΔV
GATE
= 5V
V
12VGATE
= 17V, V
5VGATE
= 10V
V
3VGATE
= 8.3V
V
VEEGATE
= –7V
●
●
●
125
155
32
250
310
65
375
465
98
mA
mA
mA
Input/Output Pins
V
ON, BD_SEL#(TH)
ON, BD_SEL# Pin Threshold Voltage V
ON
Rising, V
BD_SEL#
Rising
●
1.21 1.235 1.26 V
ΔV
ON, BD_SEL#(HYST)
ON, BD_SEL# Pin Hysteresis
●
70 120 170 mV
I
BD_SEL#(UP)
BD_SEL# Pull-Up Current V
BD_SEL#
= 0V
●
–7 –10 –16 µA
ELECTRICAL CHARACTERISTICS
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LTC4245IG#PBF

Mfr. #:
Buy LTC4245IG#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Quad Hot Swap Contr. w/ADC and I2C
Lifecycle:
New from this manufacturer.
Delivery:
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