Linear Technology LTC1643L-1, LTC1643L Datasheet
FEATURES
■
Allows Safe Board Insertion and Removal from a
Live PCI Slot
■
Works on either a Motherboard (LTC1643H) or
CompactPCITM Card (LTC1643L/LTC1643L-1)
■
Controls –12V, 3.3V, 5V, 12V Supplies
■
Programmable Foldback Current Limit with
Circuit Breaker
■
User-Programmable Supply Voltage Power-Up Rate
■
High Side Drive for External N-Channels
■
–12V and 12V On-Chip Switches
■
Fault and Power-Good Outputs
U
APPLICATIO S
■
PCI-Based Servers
■
CompactPCI Compliant Boards
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
CompactPCI is a trademark of PCI Industrial Computer Manufacturing Group.
LTC1643L/LTC1643L-1/LTC1643H
PCI-Bus Hot Swap
Controller
U
DESCRIPTIO
The LTC®1643 is a Hot SwapTM controller that allows a board
to be safely inserted and removed from a live PCI-Bus slot.
Two external N-channel transistors control the 3.3V and 5V
supplies while on-chip switches control the –12V and 12V
supplies. All supply voltages can be ramped up at a programmable rate. An electronic circuit breaker protects all four
supplies against overcurrent faults. The foldback current limit
feature limits current spikes and power dissipation when
shorts occur and allows boards with large capacitances to be
powered up without tripping the circuit breaker. The PWRGD
output indicates when all of the supply voltages are within
tolerance and the FAULT output indicates an overcurrent
condition. The ON(LTC1643H)/ON (LTC1643L/LTC1643L-1)
pin is used to cycle the board power or reset the circuit
breaker. The LTC1643L-1 has the ±12V power good comparators disabled.
The LTC1643 is available in a 16-pin narrow SSOP package.
TYPICAL APPLICATION
SYSTEM
POWER
SUPPLY
8
1
2
5
R3
PCI
POWER
SYSTEM
CONTROLLER
RESET
10k
10k
6
R4
7
U
0.005ΩQ2IRF7413
3V
IN
GND
12V
IN
V
EEIN
ON
FAULT
PWRGD
Hot Swappable PCI Supply
R2
R5
10Ω
109
11 3 13 12 14
3V
SENSE
GATE
3V
OUT
LTC1643H
5V
R1
0.007Ω
IN
5V
SENSE
Q1
IRF7413
R6
10Ω
5V
5A
3.3V
7.6A
R7
100Ω
C1
5V
OUT
12V
OUT
V
EEOUT
TIMER
0.047µF
16
15
4
C2
0.1µF
GND
12V
500mA
–12V
100mA
LOGIC
RESET
1643 TA01
1
LTC1643L/LTC1643L-1/LTC1643H
WW
W
ABSOLUTE MAXIMUM RATINGS
U
U
W
PACKAGE/ORDER INFORMATION
(Note 1)
Supply Voltages
12VIN................................................................ 13.2V
V
.............................................................. –13.2V
EEIN
Input Voltage (Pin 5) ................ –0.3V to (12VIN + 0.3V)
Output Voltages (Pins 6, 7) ...... –0.3V to (12VIN + 0.3V)
Analog Voltages
(Pins 3, 4, 9, 10 to 14) ........ –0.3V to (12VIN + 0.3V)
V
12V
............................................ –13.2V to + 0.3V
EEOUT
.............................................. –0.3V to 13.2V
OUT
Operating Temperature Range
Commercial .............................................0°C to 70°C
Industrial ........................................... –40°C to 85°C
12V
V
EEIN
3V
OUT
TIMER
ON/ON*
FAULT
PWRGD
GND
16-LEAD NARROW PLASTIC SSOP
* ON FOR LTC1643H, ON FOR LTC1643L
TOP VIEW
1
IN
2
3
4
5
6
7
8
GN PACKAGE
T
= 150°C, θJA = 135°C/ W
JMAX
ORDER PART
12V
16
OUT
15
V
EEOUT
14
5V
OUT
13
5V
IN
12
5V
SENSE
11
GATE
10
3V
SENSE
9
3V
IN
NUMBER
LTC1643HCGN
LTC1643LCGN
LTC1643L-1CGN
LTC1643HIGN
LTC1643LIGN
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Consult factory for Military grade parts.
DC ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
V
= 12V, VEE = –12V, V
12VIN
= 3.3V, V
3VIN
= 5V. (Note 2)
5VIN
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
DD
V
LKO
V
FB
t
CB
I
CP
∆V
V
DROP
I
CL
T
TS
V
TH
GATE
V
Supply Current ON = 3V, ON = GND ● 3.5 8 mA
12VIN
Undervoltage Lockout 12V
3V
5V
IN
IN
IN
Foldback Current Limit Voltage VFB = (V
= (V
V
FB
V
= (V
FB
= (V
V
FB
5VIN
5VIN
3VIN
3VIN
– V
– V
– V
– V
5VSENSE
5VSENSE
3VSENSE
3VSENSE
), V
), V
), V
), V
= 0V ● 4 7.5 12 mV
5VOUT
> 4V ● 40 53 65 mV
5VOUT
= 0V ● 4 7.5 12 mV
3VOUT
> 2V ● 40 53 65 mV
3VOUT
● 7 9.5 10.8 V
● 2.25 2.5 2.75 V
● 2.25 2.5 2.75 V
Circuit Breaker Trip Filter Time 14.6 µs
GATE Pin Output Current Charge Pump On, V
Charge Pump Off, V
Charge Pump Off, V
External Gate Voltage (V
Internal Switch Voltage Drop (V
(V
12VIN
12VIN
EEOUT
– V
– V
– V
GATE
12VOUT
EEIN
Current Foldback 12VIN = 12V, 12V
, 12V
12V
V
EEIN
V
EEIN
IN
= –12V, V
, V
= 12V ● 525 850 1500 mA
OUT
= –12V ● 225 450 800 mA
EEOUT
= GND, FAULT = High ● – 20 – 50 –100 µA
GATE
= 5V, FAULT = High 200 µA
GATE
= 2V, FAULT = Low ● 3 1020 mA
GATE
) 100 200 mV
), I
), I
VEEIN
OUT
EEOUT
= 500mAC Grade ● 250 600 mV
12VOUT
I Grade
● 250 750 mV
= 100mA ● 120 250 mV
= 0V ● 50 250 500 mA
= 0V ● 100 160 215 mA
Thermal Shutdown Temperature 150 °C
Power-Good Threshold Voltage V
12VOUT
LTC1643H/LTC1643L Only I Grade
V
EEOUT
LTC1643H/LTC1643L Only I Grade
C Grade ● 10.8 11.1 11.4 V
● 10.4 11.1 11.4 V
C Grade ● – 10.2 –10.5 –10.8 V
● –10.0 –10.5 –10.8 V
2
LTC1643L/LTC1643L-1/LTC1643H
DC
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
V
= 12V, VEE = –12V, V
12VIN
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
TH
V
IL
V
IH
V
OL
I
IN
Power-Good Threshold Voltage V
Input Low Voltage ON/ON, FAULT ● 0.8 V
Input High Voltage ON/ON, FAULT ● 2V
Output Low Voltage FAULT, PWRGD, I = 3mA ● 0.4 V
ON/ON Pin Input Current ON/ON = GND ● ±0.08 ±10 µA
5V
Input Current 5V
SENSE
3V
Input Current 3V
SENSE
5VIN Input Current 5VIN = 5V ● 460 700 µA
3VIN Input Current 3VIN = 3V ● 320 600 µA
5V
Input Current 5V
OUT
3V
Input Current 3V
OUT
R
DIS
I
TIMER
V
TIMER
5V
Discharge Impedance ON = GND or ON = 3V 100 Ω
OUT
Discharge Impedance ON = GND or ON = 3V 70 Ω
3V
OUT
12V
Discharge Impedance ON = GND or ON = 3V 450 Ω
OUT
Discharge Impedance ON = GND or ON = 3V 1600 Ω
V
EEOUT
TIMER Pin Current Timer On, V
TIMER Threshold Voltage (V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
= 3.3V, V
3VIN
= 5V.(Note 2)
5VIN
3VOUT
V
5VOUT
ON/ON= 12V
Timer Off, V
12VIN
C Grade ● 2.8 2.9 3.0 V
I Grade
● 2.75 2.9 3.0 V
C Grade ● 4.5 4.65 4.75 V
I Grade
IN
= 5V ● 50 100 µA
SENSE
= 3V ● 50 100 µA
SENSE
= 5V, ON = 3V, ON = GND ● 240 500 µA
OUT
= 3.3V, ON = 3V, ON = GND ● 220 500 µA
OUT
= GND ● –15 –22 –27 µA
TIMER
= 5V 45 mA
TIMER
– V
) ● 0.5 0.9 1.3 V
TIMER
● 4.4 4.65 4.75 V
● ±0.08 ±10 µA
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
UW
TYPICAL PERFORMANCE CHARACTERISTICS
3.3V and 5V Current
Foldback Profile
11
10
9
3V
OUT
8
7
6
5
4
OUTPUT CURRENT (A)
3
2
1
0
1
0
OUTPUT VOLTAGE (V)
5V
OUT
R
= 0.005Ω
SENSE
3
4
2
5
1643 G01
12V Current Foldback Profile –12V Current Foldback Profile
1.0
0.5
OUTPUT CURRENT (A)
0
2
0
6
4
OUTPUT VOLTAGE (V)
810
1643 G02
1.0
0.5
OUTPUT CURRENT (A)
12
0
–2
0
–6
–4
OUTPUT VOLTAGE (V)
–8 –10
–12
1643 G03
3
LTC1643L/LTC1643L-1/LTC1643H
TEMPERATURE (°C)
–50
GATE CURRENT (µA)
90
80
70
60
50
40
0
50
75
1643 G06
–25
25
100
125
UW
TYPICAL PERFORMANCE CHARACTERISTICS
Timer Current vs Temperature
23.5
23.0
22.5
22.0
21.5
21.0
TIMER CURRENT (µA)
20.5
20.0
19.5
–50
050
–25 25 75 125
TEMPERATURE (°C)
Power Good Threshold Voltage vs
Temperature (12V
11.08
11.06
11.04
11.02
11.00
POWER GOOD THRESHOLD VOLTAGE (V)
10.98
–50
0
–25
TEMPERATURE (°C)
)
OUT
50
25
Gate Current vs Temperature
Power Good Threshold Voltage vs
Temperature (3V
2.904
2.903
2.902
2.901
2.900
2.899
2.898
2.897
POWER GOOD THRESHOLD VOLTAGE (V)
2.896
–50
050
–25 25 75 125
TEMPERATURE (°C)
OUT
)
100
1643 G09
100
1643 G04
25.0
22.5
20.0
(mA)
17.5
SINK
GATE I
15.0
12.5
10.0
Gate I
–50
vs Temperature
SINK
–25 0
TEMPERATURE (°C)
FAULT = LOW
50 100 125
25 75
1643 G05
Power Good Threshold Voltage vs
Temperature (5V
4.64
4.63
4.62
4.61
4.60
4.59
POWER GOOD THRESHOLD VOLTAGE (V)
100
125
1643 G07
75
4.58
–50
–25 0
TEMPERATURE (°C)
)
OUT
50 100 125
25 75
1643 G08
Power Good Threshold Voltage
vs Temperature (V
–10.50
–10.48
–10.46
–10.44
–10.42
–10.40
–10.38
–10.36
POWER GOOD THRESHOLD VOLTAGE (V)
–10.34
4
–50
050
–25 25 75 125
TEMPERATURE (°C)
EEOUT
)
100
1643 G10
12V Internal Switch Voltage Drop
vs Temperature
325
I
= 500mA
12VOUT
300
275
250
225
200
175
INTERNAL SWITCH VOLTAGE DROP (mV)
150
–50 25 75
–25 0
50 100 125
TEMPERATURE (°C)
LT1643 G11
VEE Internal Switch Voltage Drop
vs Temperature
180
I
= 100mA
VEEIN
160
140
120
100
80
INTERNAL SWITCH VOLTAGE DROP (mV)
60
–50
–25 0
TEMPERATURE (°C)
50 100 125
25 75
1643 G12
LTC1643L/LTC1643L-1/LTC1643H
UW
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit Breaker Trip Filter Time
vs Temperature
15.50
15.25
15.00
14.75
14.50
14.25
CIRCUIT BREAKER TRIP FILTER TIME (µs)
14.00
–50
–25 0
V
Supply Current
EEIN
TEMPERATURE (°C)
50 100 125
25 75
vs Temperature
0.90
0.89
0.88
0.87
0.86
SUPPLY CURRENT (mA)
EEIN
V
0.85
1643 G13
Timer Threshold Voltage
vs Temperature
1.0
0.9
0.8
TIMER THRESHOLD VOLTAGE (V)
V
– V
12VIN
TIMER
0.7
–50
–25 0
25 75
TEMPERATURE (°C)
5VIN Supply Current
vs Temperature
270
268
266
264
262
SUPPLY CURRENT (µA)
260
IN
5V
258
50 100 125
1643 G14
12VIN Supply Current
vs Temperature
3.72
3.70
3.68
3.66
SUPPLY CURRENT (mA)
IN
3.64
12V
3.62
–50
–25
0
TEMPERATURE (°C)
3VIN Supply Current
vs Temperature
275.0
272.5
270.0
267.5
265.0
SUPPLY CURRENT (µA)
IN
3V
262.5
50
25
75
100
125
1643 G15
0.84
–50
–25 0
VOL vs Temperature
350
I = 3mA
300
250
(mV)
200
OL
V
150
100
50
–50
–25 0
50 100 125
25 75
TEMPERATURE (°C)
FAULT
PWRGD
50 100 125
25 75
TEMPERATURE (°C)
1643 G16
1643 G19
256
–50 25 75
–25 0
TEMPERATURE (°C)
12VIN Undervoltage Lockout
vs Temperature
9.515
9.510
9.505
9.500
9.495
UNDERVOLTAGE LOCKOUT (V)
9.490
9.485
–50
–25 0
25 75
TEMPERATURE (°C)
50 100 125
LT1643 G17
50 100 125
1643 G20
260.0
–50
–25 0
25 75
TEMPERATURE (°C)
5VIN Undervoltage Lockout
vs Temperature
2.454
2.452
2.450
2.448
2.446
UNDERVOLTAGE LOCKOUT (V)
2.444
2.442
–50
–25 0
25 75
TEMPERATURE (°C)
50 100 125
1643 G18
50 100 125
1643 G21
5
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