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LTC4242CUHF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC4242
1
4242f
Dual Slot Hot Swap
Controller for PCI Express
The LTC
®
4242 Hot Swap
TM
controller allows safe board
insertion and removal for two independent slots on a PCI
Express backplane. External N-channel transistors control
the 12V and 3.3V supplies while integrated switches control
the 3.3V auxiliary supplies. Both 12V and 3.3V supplies
can be ramped up at an adjustable rate. Dual level circuit
breakers and fast active current limiting protect all supplies
against overcurrent faults.
A supply fi lter at the V
CC
pin allows the LTC4242 to endure
supply transients. The EN input detects the presence of a
card in the PCI Express slot. The FAULT and AUXFAULT
outputs alert the system of overcurrent conditions on the
main and auxiliary supplies, respectively. PGOOD and
AUXPGOOD outputs indicate proper main and auxiliary
supply outputs.
■
PCI Express-Based PC and Servers
■
Hot Swap Application for Triple Supply Systems
■
Allows Live Insertion into PCI Express
®
Backplane
■
Controls Two Independent PCI Express Slots
■
Independent Control of Main and Auxiliary Supplies
■
20V Rating for 12V Supply Input Pins
■
Integrated 0.25Ω AUX Switches
■
Limits Fault Current in ≤1µs
■
Force On Test Mode
■
Adjustable Supply Voltage Power-Up Rate
■
High Side Drivers for N-Channel MOSFETs
■
Thermal Shutdown Protection
■
Available in 38-Lead QFN and 36-Lead SSOP
Packages
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
PCI Express Application
Normal Power-Up Sequence
3V
SENSE1
3V
GATE1
3V
IN1
4242 TA01a
PCIe
CONNECTOR
PLUG-IN
CARD
PCIe
CONNECTOR
PLUG-IN
CARD
3.3V
OUT
3.3V
OUT
12V
OUT
3V
OUT1
3V
OUT2
12V
SENSE1
12V
GATE1
12V
IN1
V
CC
AUXIN1
AUXOUT1
FON1
EN1
GND
EN2
FON2
3.3V
3.3V
12V
AUXOUT2
3.3V
AUXON1
ON1
FAULT1
AUXFAULT1
PGOOD1
PGOOD2
AUXFAULT2
FAULT2
ON2
AUXON2
12V
3.3V
12V
OUT1
3V
SENSE2
3V
GATE2
3V
IN2
LTC4242G
12V
SENSE2
12V
GATE2
12V
IN2
12V
OUT2
BD_PRST1
12V
OUT
3.3V
OUT
3.3V
OUT
BD_PRST2
PCI EXPRESS
HOT PLUG
CONTROLLER
AUXIN2
AUXOUTn
5V/DIV
12V
OUTn
5V/DIV
3V
OUTn
5V/DIV
PGOODn
5V/DIV
10ms/DIV
4242 F04
ENn
5V/DIV
LTC4242
2
4242f
Supply Voltages
V
CC
........................................................... –0.3V to 7V
12V
INn
.................................................... –0.3V to 20V
3V
INn
...................................................... –0.3V to 10V
AUXINn .................................................. –0.3V to 10V
Input Voltages
ONn, AUXONn, FONn ............................... –0.3V to 7V
ENn .......................................................... –0.3V to 7V
Output Voltages
FAULTn, PGOODn, AUXFAULTn,
AUXPGOODn ........................................... –0.3V to 7V
Analog Voltages
12V
SENSEn
.............................................. –0.3V to 20V
(Note 1)
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
EN1
FON1
ON1
AUXON1
3V
OUT1
3V
GATE1
3V
SENSE1
3V
IN1
AUXIN1
V
CC
AUXIN2
3V
IN2
3V
SENSE2
3V
GATE2
3V
OUT2
AUXON2
ON2
FON2
FAULT1
AUXFAULT1
PGOOD1
12V
IN1
12V
SENSE1
12V
GATE1
12V
OUT1
AUXOUT1
GND
AUXOUT2
12V
OUT2
12V
GATE2
12V
SENSE2
12V
IN2
PGOOD2
AUXFAULT2
FAULT2
EN2
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
1AUXON1
3V
OUT1
3V
GATE1
3V
SENSE1
3V
IN1
AUXIN1
V
CC
AUXIN2
3V
IN2
3V
SENSE2
3V
GATE2
3V
OUT2
12V
IN1
12V
SENSE1
12V
GATE1
12V
OUT1
AUXOUT1
GND
AUXOUT2
12V
OUT2
12V
GATE2
12V
SENSE2
12V
IN2
AUXPGOOD2
ON1
FON1
EN1
FAULT1
AUXFAULT1
PGOOD1
AUXPGOOD1
AUXON2
ON2
FON2
EN2
FAULT2
AUXFAULT2
PGOOD2
23
22
21
20
9
10
11
12
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, PCB ELECTRICAL CONNECTION OPTIONAL
ORDER PART NUMBER ORDER PART NUMBER UHF PART MARKING*
LTC4242CG
LTC4242IG
LTC4242CUHF
LTC4242IUHF
4242
4242
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/
*The temperature grade is identifi ed by a label on the shipping container. Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
12V
GATEn
................................................ –0.3V to 25V
12V
OUTn
(Note 3) .. 12V
GATEn
– 5V to 12V
GATEn
+ 0.3V
AUXOUTn, 3V
SENSEn
.............................. –0.3V to 10V
3V
GATEn
.................................................. –0.3V to 14V
3V
OUTn
(Note 3) ....... 3V
GATEn
– 5V to 3V
GATEn
+ 0.3V
Operating Temperature Range
LTC4242C ................................................ 0°C to 70°C
LTC4242I ............................................. –40°C to 85°C
Storage Temperature Range
SSOP ................................................. –65°C to 150°C
QFN .................................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
SSOP ................................................................ 300°C
LTC4242
3
4242f
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= V
AUXINn
= V
3VINn
= 3.3V, V
12VINn
= 12V, unless otherwise noted.
(Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
V
IN
Operating Voltage V
CC
12V
INn
3V
INn
AUXINn
●
●
●
●
2.7
10.1
3.0
3.0
6.0
14.4
6.0
6.0
V
V
V
V
I
DD
Input Supply Current
V
CC
12V
INn
3V
INn
V
AUXONn
= 2V, V
ONn
= 2V
●
●
●
1.6
0.5
0.35
4
1
1
mA
mA
mA
V
UVL
Supply Undervoltage Lockout V
CC
Rising
12V
INn
Rising
3V
INn
Rising
AUXINn Rising
●
●
●
●
2.3
9.48
2.57
2.57
2.45
9.78
2.67
2.67
2.6
10.08
2.77
2.77
V
V
V
V
ΔV
LKO(HYST)
Supply Undervoltage Lockout Hysteresis V
CC
12V
INn
3V
INn
AUXINn
●
●
●
●
30
90
20
20
100
130
35
35
200
170
50
50
mV
mV
mV
mV
Current Limit
ΔV
SENSE(CB)
Circuit Breaker Trip Sense Voltage
12V
INn
– 12V
SENSEn
3V
INn
– 3V
SENSEn
●
●
45
45
50
50
55
55
mV
mV
ΔV
SENSE(ACL)
Active Current Limit Sense Voltage
12V
INn
– 12V
SENSEn
3V
INn
– 3V
SENSEn
●
●
75
75
100
100
125
125
mV
mV
I
CBAUX
Circuit Breaking Current for AUX Supply
●
385 550 715 mA
t
CB
Circuit Breaker Response Time
●
10 20 40 µs
Switch Resistance
R
AUX
Internal Switch Resistance
R
AUX
= (V
AUXINn
– V
AUXOUTn
)/I
(Note 4)
I = 375mA
●
0.25 0.4 Ω
External Gate Drive
I
GATE(UP)
External N-Channel Gate Pull-Up Current Gate Drive On
V
12VGATEn
= 1V
V
3VGATEn
= 1V
●
●
–5
–5
–9
–9
–13
–13
µA
µA
I
GATE(DN)
External N-Channel Gate Pull-Down Current Gate Drive Off
V
12VGATEn
= 17V, V
12VOUTn
= 12V
V
3VGATEn
= 8.3V, V
3VOUTn
= 3.3V
●
●
0.5
0.5
1
1
2
2
mA
mA
I
GATE(FPD)
External N-Channel Gate Fast Pull-Down
Current
Fast Turn Off
V
12VGATEn
= 17V, V
12VOUTn
= 12V
V
3VGATEn
= 8.3V, V
3VOUTn
= 3.3V
●
●
150
150
250
250
400
400
mA
mA
ΔV
GATE
External N-Channel Gate Drive
12V
GATEn
– 12V
OUTn
3V
GATEn
– 3V
OUTn
I
GATE
= 1µA (Note 3)
●
●
4.5
4.5
5.5
5.5
7.9
7.9
V
V
Input Pins
V
PG(TH)
Power Good Threshold Voltage 12V
OUTn
Falling
3V
OUTn
Falling
AUXOUTn Falling (Note 5)
●
●
●
10.08
2.772
2.772
10.38
2.855
2.855
10.68
2.937
2.937
V
V
V
V
PG(HYST)
Power Good Hysteresis 12V
OUTn
3V
OUTn
AUXOUTn (Note 5)
●
●
●
20
5
5
70
20
20
110
30
30
mV
mV
mV
ELECTRICAL CHARACTERISTICS
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LTC4242CUHF#PBF

Mfr. #:
Buy LTC4242CUHF#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Dual PCI Express Hot Swap Controller
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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