MAX5916AUUI [MAXIM]
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| 型号： | MAX5916AUUI |
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MAXIM INTEGRATED PRODUCTS |
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19-2420; Rev 1; 4/04
Dual PCI 2.2 Hot-Swap Controllers
General Description
Features
The MAX5915/MAX5915A/MAX5916/MAX5916A dual
PCI 2.2 hot-swap controllers allow for safe insertion and
removal of two PCI cards into live PCI slots or back-
planes by limiting the inrush current at startup. After
startup, these devices provide protection against short-
circuit, overcurrent, and undervoltage conditions.
ꢀ PCI 2.2 Compliant
ꢀ Independent Power Controls for +3.3V, +5V, 12V,
and +3.3V Auxiliary Supplies of Two PCI Cards
ꢀ Internal MOSFET Switches for 12V and +3.3V
Auxiliary Outputs
ꢀ Separate ON/OFF Control Input for Each Channel
The MAX5915/MAX5915A/MAX5916/MAX5916A pro-
vide independent power controls for +3.3V, +5V, 12V,
and +3.3V auxiliary supplies of two PCI cards. These
devices provide intelligent selective thermal shutdown
control that shuts down the channel with an overcurrent
fault. All devices include internal power MOSFETs for the
+12V, -12V, and +3.3V auxiliary outputs. These devices
use internal charge pumps to activate the gates of the
internal FETs controlling the +3.3V auxiliary supply.
Internal FETs and current-sense circuitry regulate the
12V and the +3.3V auxiliary supplies. Channels A and B
operate independently, allowing a single device to moni-
tor two PCI card slots.
ꢀ Independent +3.3V Auxiliary Output ON/OFF
Control
ꢀ Overcurrent Foldback with Timeout and Shutdown
Protection for 12V and +3.3V Auxiliary Rails with
Status Report
ꢀ Brick Wall with Timeout and Shutdown Protection
for +5V and +3.3V Rails with Status Report
ꢀ Output Undervoltage Monitoring for +3.3V, +5V,
+12V, and +3.3V Auxiliary Rails with Status Report
ꢀ +3.3V Auxiliary Autorestart
The MAX5915/MAX5915A offer latched fault protection
and the MAX5916/MAX5916A offer autorestart fault pro-
tection. The devices are available in the low-profile
28-pin TSSOP package and are specified over the
-40°C to +85°C extended temperature range.
ꢀ Intelligent Selective Thermal Shutdown Control
Shuts Down Only the Channel with an Overcurrent
Fault
ꢀ 28-Pin TSSOP Package
Ordering Information
Applications
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 TSSOP
PCI 2.2 Server
PCI Server
RAID
MAX5915EUI
MAX5915AEUI
MAX5916EUI
MAX5916AEUI
28 TSSOP
28 TSSOP
28 TSSOP
Selector Guide, Pin Configuration, Functional Diagram, and
Typical Operating Circuit appear at end of data sheet.
Typical Application Circuit
FAIRCHILD
FDS6670A
+3.3V
+5V
0.005Ω
470µF
FAIRCHILD
FDS6670A
0.005Ω
470µF
5VO_
3.3VO_ 5VGATE_ 5VSEN_
3.3VGATE_ 3.3VSEN_
+12VIN
-12VIN
3.3VAUXIN
+12V
+12VO_
-12VO_
-12V
4.7µF 0.1µF
47µF
+3.3VAUX
3.3VAUXO_
4.7µF 0.1µF
47µF
4.7µF 0.1µF
MAX5915
MAX5915A
MAX5916
MAX5916A
47µF
5V
ON
ON_
ON
OFF
10kΩ
AUXON_
OFF
10kΩ
PGOOD_
GND
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Dual PCI 2.2 Hot-Swap Controllers
ABSOLUTE MAXIMUM RATINGS
+12VIN to GND ...................................................-0.3V to +14.0V
-12VIN to GND........................................................-14V to +0.3V
Continuous Power Dissipation (T = +70°C)
28-Pin TSSOP (derate 23.8mW/°C above +70°C) ...........1.9W
A
-12VO_ to GND......................................+0.3V to (V
+12VO_, 3.3VGATE_, 5VGATE_
- 0.3V)
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
-12VIN
to GND..................................................-0.3V to (V
+ 0.3V)
+12VIN
Any Other Pin to GND ...........................................-0.3V to +6.0V
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= -12V, V
= +12V, V
= +3.3V, V
= V
= +5V, T = -40°C to +85°C, unless otherwise specified.
AUXON_ A
-12VIN
+12VIN
3.3VAUXIN
ON_
Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLIES
Main Supply Input Voltage
Range
V
10.8
9.6
12
10
13.2
10.8
V
V
+12VIN
Main Supply Undervoltage
Lockout (UVLO)
V
V
rising
+12VIN
+12UVLO
Main Supply UVLO Hysteresis
Main Input UVLO Delay Time
Supply Current
V
100
1.6
2.5
mV
ms
mA
UVLO, HYS
t
Figures 1 and 2 (Note 1)
DEG, UVLO
I
5.0
Q
+3.3V SUPPLY CONTROL
V
V
_ = +6V, V
_ = +3.3V
= +3.3V,
3.3VSEN_
3.3VGATE
Gate Charge Current
Gate Discharge Current
Gate High Voltage
I
5
15
30
µA
µA
V
3.3VGATE_, CHG
3.3VO
I
V
_ = +12V, V
= 0V
ON_
50
150
250
3.3VGATE_, DIS
3.3VGATE
V
-
+12VIN
0.5
V
I
_ = 1µA
V
+12VIN
3.3VGATE_, HIGH
3.3VGATE
Gate Low Voltage
V
I
_ = 1µA, V _ = 0V
0.1
1
0.4
20
V
3.3VGATE_, LOW
3.3VGATE
ON
3.3VO_ Input Bias Current
3.3VO_ Internal Pulldown
3.3VSEN_ Input Bias Current
Current-Limit Threshold
Output Undervoltage Threshold
I
V
V
V
V
V
_ = +3.3V
3.3VO
µA
kΩ
µA
mV
V
3.3VO_, BIAS
R
_ = 0V
PD
3.3VSEN_, BIAS
ON
I
_ = +3.3V
10
51
3.3VSEN
3.3VGATE
3.3VGATE
V
_ = +6V
_ falling
41
46
3.3V, LIM
V
2.79
2.89
2.99
3.3VIN, UV
Output Undervoltage Threshold
Hysteresis
30
mV
2
_______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
= -12V, V
= +12V, V
= +3.3V, V
= V
= +5V, T = -40°C to +85°C, unless otherwise specified.
AUXON_ A
-12VIN
+12VIN
3.3VAUXIN
ON_
Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
+5V SUPPLY CONTROL
V
V
_ = +6V, V
_ = +5V
_ = +5V,
5VGATE
5VSEN
Gate Charge Current
Gate Discharge Current
Gate High Voltage
I
_
5
15
30
µA
µA
V
5VGATE , CHG
5VO
I
_
V
_ = +12V, V _ = 0V
50
150
250
5VGATE , DIS
5VGATE
ON
V
-
+12VIN
0.5V
V
_
I
I
_ = 1µA
V
+12VIN
5VGATE , HIGH
5VGATE
Gate Low Voltage
V
_
_ = 1µA, V _ = 0V
0.1
1
0.4
20
V
5VGATE , LOW
5VGATE
ON
5VO_ Input Bias Current
5VO_ Internal Pulldown
5VSEN_ Input Bias Current
Current-Limit Threshold
Output Undervoltage Threshold
I
_
V
V
V
V
_ = +5V
5VO
µA
kΩ
µA
mV
V
5VO , BIAS
R
_
_ = 0V
ON
5VO , PD
I
_
_ = +5V
10
35
5VSEN , BIAS
5VSEN
V
_
_ falling
27
31
5VO , LIM
5VGATE
V
_
Output falling
4.34
4.50
4.70
5VO , UV
Output Undervoltage Threshold
Hysteresis
45
mV
+12V SUPPLY CONTROL
T
T
= +25°C, I = 0.5A
0.32
0.38
0.5
A
D
On-Resistance of Internal Switch
R
Ω
DS(ON), +12V
= +85°C, I = 0.5A
A
D
Foldback Current Limit
I
V
_ = 0V
+12VO
0.68
1
1.4
10.4
1
1.36
A
A
+12VIN, LIM
Current-Foldback Threshold
Output Undervoltage Threshold
+12VO_ Internal Pulldown
-12V SUPPLY CONTROL
Output current rising (Note 2)
Output falling
V
_
10.00
10.82
V
+12VO , UV
R
_
V
_ = 0V
ON
kΩ
+12VO , PD
T
T
= +25°C, I = 0.1A
0.58
0.9
1.3
A
D
On-Resistance of Internal Switch
R
Ω
DS(ON), -12V
= +85°C, I = 0.1A
A
D
Foldback Current Limit
I
V
= 0V
-12VO_
136
205
240
1
273
mA
mA
kΩ
-12VIN, LIM
Current-Foldback Threshold
-12VO_ Internal Pullup
Output current rising (Note 2)
V = 0V
ON_
R
-12VO_, PU
+3.3VAUX SUPPLY CONTROL
Input Voltage Range
V
3.0
3.3
3.6
V
V
3.3VAUXIN
3.3VAUXIN Undervoltage
Lockout
V
Input rising
2.65
2.75
2.85
UVLO, AUX
Hysteresis
V
30
1
mV
mA
UVLO-AUX, HYS
Supply Current
I
2
Q, 3.3VAUX
_______________________________________________________________________________________
3
Dual PCI 2.2 Hot-Swap Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
= -12V, V
= +12V, V
= +3.3V, V
= V
= +5V, T = -40°C to +85°C, unless otherwise specified.
AUXON_ A
-12VIN
+12VIN
3.3VAUXIN
ON_
Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
= +25°C, I = 0.4A
MIN
TYP
MAX
0.4
UNITS
T
T
0.24
A
D
On-Resistance of Internal Switch
R
Ω
DS(ON), 3.3VAUX
= +85°C, I = 0.4A
0.6
A
D
Foldback Current Limit
I
V
_ = 0V
3.3VAUXO
0.5
0.75
1.2
2.89
1.6
1
1.0
A
A
3.3VAUXIN, LIM
Current-Foldback Threshold
Output Undervoltage Threshold
Auxiliary Input UVLO Delay Time
3.3VAUXO_ Internal Pulldown
ON AND AUXON COMPARATORS
Output current rising (Note 2)
V
2.76
2.99
V
3.3VAUXIN, UV
t
(Note 1)
ms
kΩ
DEG, UVLO
R
ON_ = 0V
3.3VAUXO_
Threshold Voltage
Hysteresis
1.0
0.5
2.1
20
V
V
25
4
mV
µA
HYS
I
B, COMP
Input Bias Current
ON_ and AUXON_ Deglitch
Time
t
Figures 5–8 (Note 3)
µs
DEG
FAULT RESPONSE, PGOOD_ STATUS OUTPUT COMPARATORS
PGOOD_ Output Overcurrent
and Undervoltage Response
Time
t
Figures 5–8 MAX5915/MAX5916
Figures 5–8 MAX5915A/MAX5916A
1.5
ms
ns
RESP
t
100
RESP2
DELAY
Output Overcurrent and
Undervoltage Deglitch Time
16 x
t
RESP
t
Figures 3–7
ms
ms
4 x
DELAY
PGOOD_ Startup Timeout
t
See Figures 1, 2, 5, 6, 7, and 8
START
t
Delay time to restart after OC and/or
UV shutdown
64 x
START
Autorestart Delay
t
ms
V
RESTART
t
PGOOD_ Output Low Voltage
V
I
= 2mA, ON_ = 0V
0.5
0.7
1
OL
SINK
PGOOD_ Output High Leakage
Current
I
V
= +5.5V
PGOOD_
µA
LEAK
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
T
(Note 4)
125
5
°C
°C
SD
T
HYS
Full Thermal Shutdown
Threshold
T
+
SD
20
T
(Note 5)
°C
°C
SD, FULL
Full Thermal Shutdown
Hysteresis
T
5
HYS, FULL
Note 1: t
is negative edge triggered. There is no time delay when the inputs rise above the UVLO threshold.
DEG, UVLO
Note 2: The current threshold when the output current starts to fold back. See the Typical Operating Characteristics.
Note 3: t is negative edge triggered. ON_ or AUXON_ transition from low to high has no delay.
DEG
Note 4: Temperature threshold at which the outputs of the channel with overcurrent shut down.
Note 5: The temperature threshold at which both channels shut down.
4
_______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Characteristics
(V
= +12V, V
= +3.3V, V
= -12V, V = +5V, V
= +3.3V, R
= 0.005Ω, R
= 0.005Ω, C
=
+12VIN
3.3VAUXIN
-12VIN
5V
3.3V
5VSEN_
3.3VSEN_
3.3VO_
C
5VO_
= 470µF, C
= C
= C
= 47µF, T = +25°C, unless otherwise noted. See Typical Application Circuit.)
3.3VAUXO_ A
+12VO_
-12VO_
+12VO_ VOLTAGE
vs. OUTPUT CURRENT
+12VO_ CURRENT FOLDBACK
vs. DIFFERENTIAL SWITCH VOLTAGE
-12VO_ VOLTAGE
vs. OUTPUT CURRENT
12.1
12.0
11.9
11.8
11.7
11.6
11.5
11.4
1.1
0.9
0.7
0.5
0.3
0.1
-0.1
-11.5
-11.6
-11.7
-11.8
-11.9
-12.0
-12.1
200
4
0
0
0
0.5
1.0
1.5
0
2
12
0
50
250
6
8
(V)
10
100
150
OUTPUT CURRENT (A)
V
- V
OUTPUT CURRENT (mA)
+12VIN
+12VO_
-12VO_ CURRENT FOLDBACK
vs. DIFFERENTIAL SWITCH VOLTAGE
5VO_ VOLTAGE
vs. OUTPUT CURRENT
5VO_ SENSE RESISTOR VOLTAGE
vs. DIFFERENTIAL SWITCH VOLTAGE
5.02
5.00
4.98
4.96
4.94
4.92
4.90
4.88
4.86
4.84
250
40
38
36
200
150
34
32
30
28
100
26
24
DURING CURRENT LIMIT
FAIRCHILD
FDS6670A
50
0
FAIRCHILD
FDS6670A
22
20
4.82
4.80
4
2
4
6
8
10
12
0
1
5
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
- V (V)
2
3
V
- V
(V)
OUTPUT CURRENT (A)
V
IN
-12VIN
-12VO_
5VSEN_
3.3VO_ SENSE RESISTOR VOLTAGE
vs. DIFFERENTIAL SWITCH VOLTAGE
3.3VAUX_ VOLTAGE
vs. OUTPUT CURRENT
3.3VO_ VOLTAGE
vs. OUTPUT CURRENT
48
46
44
42
40
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
3.32
3.30
3.28
3.26
3.24
3.22
38
36
34
3.20
DURING CURRENT LIMIT
FAIRCHILD
FAIRCHILD
FDS6670A
3.18
3.16
FDS6670A
32
30
6
1.0
1.5
2.0
- V
2.5
3.0
3.5
0
0.15 0.30 0.45 0.60 0.75 0.90 1.05 1.20
OUTPUT CURRENT (A)
2
8
4
V
(V)
OUTPUT CURRENT (A)
IN
3.3VSEN_
_______________________________________________________________________________________
5
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Characteristics (continued)
(V
= +12V, V
= +3.3V, V
= -12V, V = +5V, V
= +3.3V, R
= 0.005Ω, R
= 0.005Ω, C
=
+12VIN
3.3VAUXIN
-12VIN
5V
3.3V
5VSEN_
3.3VSEN_
3.3VO_
C
5VO_
= 470µF, C
= C
= C
= 47µF, T = +25°C, unless otherwise noted. See Typical Application Circuit.)
3.3VAUXO_ A
+12VO_
-12VO_
3.3VAUX_ CURRENT FOLDBACK
vs. DIFFERENTIAL SWITCH VOLTAGE
5VGATE_ AND 3.3VGATE_
CHARGE CURRENT vs. TEMPERATURE
5VGATE_ AND 3.3VGATE_
DISCHARGE CURRENT vs. TEMPERATURE
800
750
700
650
600
550
500
27.5
180
175
170
165
160
155
150
145
140
135
130
25.5
23.5
21.5
19.5
17.5
15.5
13.5
11.5
9.5
3.3VGATE_
3.3VGATE_
5VGATE_
C
= 1nF
10
GATE
5VGATE_
60
C
= 1nF
-15
GATE
7.5
1.0 1.5
- V
0
0.5
2.0 2.5
(V)
3.3VAUXO_
3.0 3.5
-40
-15
35
85
-40
10
35
60
85
V
TEMPERATURE (°C)
TEMPERATURE (°C)
3.3VAUXIN
+12V INTERNAL SWITCH R
vs. TEMPERATURE
3.3V AUXILIARY INTERNAL SWITCH R
vs. TEMPERATURE
-12V INTERNAL SWITCH R
vs. TEMPERATURE
ON
ON
ON
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
TIME-TO-CHARGE GATE
(C = 1nF)
TIME-TO-CHARGE GATE
(C = 10nF)
TIME-TO-CHARGE GATE
(C = 0.1nF)
GATE
GATE
GATE
MAX5915 toc17
MAX5915 toc18
MAX5915 toc16
ON_
5V/div
ON_
5V/div
ON_
5V/div
3.3VGATE_
5V/div
3.3VGATE_
5V/div
3.3VGATE_
5V/div
5VGATE_
5V/div
5VGATE_
5V/div
5VGATE_
5V/div
200µs/div
2ms/div
100µs/div
6
_______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Characteristics (continued)
(V
= +12V, V
= +3.3V, V
= -12V, V = +5V, V
= +3.3V, R
= 0.005Ω, R
= 0.005Ω, C
=
+12VIN
3.3VAUXIN
-12VIN
5V
3.3V
5VSEN_
3.3VSEN_
3.3VO_
C
5VO_
= 470µF, C
= C
= C
= 47µF, T = +25°C, unless otherwise noted. See Typical Application Circuit.)
3.3VAUXO_ A
+12VO_
-12VO_
+12VIN SUPPLY CURRENT
vs. TEMPERATURE
3.3VAUXIN SUPPLY CURRENT
vs. TEMPERATURE
ON_ AND AUXON_ THRESHOLD
vs. TEMPERATURE
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
2.10
2.05
2.00
1.95
1.90
1.85
1.80
RISING
FALLING
-40
-15
10
35
60
85
-40
-40
-40
-15
10
35
60
85
85
85
-40
-40
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
+12V OUTPUT UNDERVOLTAGE
THRESHOLD vs. TEMPERATURE
5V OUTPUT UNDERVOLTAGE
THRESHOLD vs. TEMPERATURE
3.3V OUTPUT UNDERVOLTAGE
THRESHOLD vs. TEMPERATURE
10.8
10.7
10.6
10.5
10.4
10.3
10.2
4.68
4.63
4.58
4.53
4.48
4.43
4.38
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
-40
-15
10
35
60
85
-15
10
35
60
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3.3V AUXILIARY OUTPUT UNDERVOLTAGE
THRESHOLD vs. TEMPERATURE
+12V INPUT UVLO
THRESHOLD vs. TEMPERATURE
3.3V AUXILIARY INPUT UVLO
THRESHOLD vs. TEMPERATURE
3.3
3.2
3.1
3.0
2.9
2.8
2.7
10.5
10.4
10.3
10.2
10.1
10.0
9.9
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
9.8
9.7
9.6
9.5
-40
-15
10
35
60
85
-15
10
35
60
85
-15
10
35
60
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
7
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Characteristics (continued)
(V
= +12V, V
= +3.3V, V
= -12V, V = +5V, V
= +3.3V, R
= 0.005Ω, R
= 0.005Ω, C
=
+12VIN
3.3VAUXIN
-12VIN
5V
3.3V
5VSEN_
3.3VSEN_
3.3VO_
C
5VO_
= 470µF, C
= C
= C
= 47µF, T = +25°C, unless otherwise noted. See Typical Application Circuit.)
3.3VAUXO_ A
+12VO_
-12VO_
+12V OUTPUT CURRENT
FOLDBACK vs. TEMPERATURE
-12V OUTPUT CURRENT
FOLDBACK vs. TEMPERATURE
3.3VO_ SENSE RESISTOR VOLTAGE
vs. TEMPERATURE
1.2
1.1
1.0
0.9
0.8
0.7
0.6
250
230
210
190
170
150
130
49
47
45
43
41
39
37
35
DURING CURRENT LIMIT
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAIN SUPPLY
TURN-ON WAVEFORMS
3.3V AUXILIARY CURRENT
FOLDBACK vs. TEMPERATURE
5VO_ SENSE RESISTOR VOLTAGE
vs. TEMPERATURE
MAX5915 toc33
40
38
925
850
775
700
625
550
475
36
ON_
34
32
5V/div
30
5VO_
5V/div
28
26
12VO_
10V/div
24
22
DURING CURRENT
LIMIT
PGOOD_
5V/div
AUXON_ = 5V
20
-40
-15
10
35
60
85
-40
-15
10
35
60
85
10ms/div
TEMPERATURE (°C)
TEMPERATURE (°C)
AUXILIARY SUPPLY
TURN-ON WAVEFORMS
MAIN SUPPLY
TURN-OFF WAVEFORMS
TURN-ON DELAY
MAX5915 toc34
MAX5915 toc36
MAX5915 toc35
AUXON_
5V/div
+12VIN
10V/div
ON_
5V/div
5VO_
5V/div
+12VO_
10V/div
3.3VAUXO_
2V/div
+12VO_
10V/div
3.3VAUXIN_
2V/div
PGOOD_
5V/div
PGOOD_
5V/div
3.3VAUXO_
2V/div
ON_ = 5V
AUXON_ = 5V
ON_ = 5.0V
10ms/div
40ms/div
200µs/div
8
_______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Characteristics (continued)
(V
= +12V, V
= +3.3V, V
= -12V, V = +5V, V
= +3.3V, R
= 0.005Ω, R
= 0.005Ω, C
=
+12VIN
3.3VAUXIN
-12VIN
5V
3.3V
5VSEN_
3.3VSEN_
3.3VO_
C
5VO_
= 470µF, C
= C
= C
= 47µF, T = +25°C, unless otherwise noted. See Typical Application Circuit.)
+12VO_
-12VO_
3.3VAUXO_
A
AUXILIARY SUPPLY
TURN-OFF WAVEFORMS
MAIN SUPPLY
LATCHED FAULT MANAGEMENT
t
DELAY TIME
DEG
MAX5915 toc37
MAX5915 toc39
MAX5915 toc38
ON_
5V/div
ON_
5V/div
+12VO_
5V/div
3.3VAUXO_
2V/div
3.3VAUXO_
2V/div
5VO_
2V/div
3.3VAUXO_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
20ms/div
2ms/div
2µs/div
MAIN SUPPLY
AUTORESTART FAULT MANAGEMENT
AUXILIARY SUPPLY
FAULT MANAGEMENT
+12VO_ IMMEDIATE
SHORT-CIRCUIT RESPONSE
MAX5915 toc40
MAX5915 toc41
MAX5915 toc42
+12VO_
5V/div
+12VO_
5V/div
+12VO_
5V/div
I
+12VO_
10A/div
5VO_
2V/div
5VO_
3.3VAUXO_
5V/div
3.3VAUXO_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
400ms/div
1µs/div
400ms/div
-12VO_ IMMEDIATE
SHORT-CIRCUIT RESPONSE
+12VO_ CURRENT FOLDBACK
-12VO_ CURRENT FOLDBACK
MAX5915 toc43
MAX5915 toc45
MAX5915 toc44
+12VO_
5V/div
-12VO_
5V/div
-12VO_
5V/div
I
-12VO_
500mA/div
I
+12VO_
5A/div
I
-12VO_
2A/div
PGOOD_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
2ms/div
2ms/div
200ns/div
_______________________________________________________________________________________
9
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Characteristics (continued)
(V
= +12V, V
= +3.3V, V
= -12V, V = +5V, V
= +3.3V, R
= 0.005Ω, R
= 0.005Ω, C
=
+12VIN
3.3VAUXIN
-12VIN
5V
3.3V
5VSEN_
3.3VSEN_
3.3VO_
C
5VO_
= 470µF, C
= C
= C
= 47µF, T = +25°C, unless otherwise noted. See Typical Application Circuit.)
+12VO_
-12VO_
3.3VAUXO_
A
5VO_ IMMEDIATE
SHORT-CIRCUIT RESPONSE
3.3VO_ IMMEDIATE
SHORT-CIRCUIT RESPONSE
5VO_ CURRENT LIMIT
MAX5915 toc47
MAX5915 toc46
MAX5915 toc48
5VO_
5V/div
5VO_
5V/div
3.3VO_
2V/div
I
5VO_
10A/div
I
5VO_
10A/div
I
3.3VO_
10A/div
FAIRCHILD
FDS6670A
FAIRCHILD
FDS6670A
PGOOD_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
2ms/div
40µs/div
20µs/div
3.3VAUXO_ IMMEDIATE
3.3VAUXO_ CURRENT FOLDBACK
3.3VO_ CURRENT LIMIT
SHORT-CIRCUIT RESPONSE
MAX5915 toc51
MAX5915 toc50
MAX5915 toc49
3.3VAUXO_
2V/div
3.3VAUXO_
2V/div
3.3VO_
2V/div
I
3.3VO_
10A/div
I
3.3VAUXO_
10A/div
I
3.3VAUXO_
1A/div
PGOOD_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
2ms/div
2µs/div
2ms/div
MAX5915A/MAX5916A
3.3VO_ SHORT CIRCUIT
MAX5915A/MAX5916A
MAX5915A/MAX5916A
12VO_ SHORT CIRCUIT
3.3VAUXO_ SHORT CIRCUIT
MAX5915 toc53
MAX5915 toc54
MAX5915 toc52
3.3VAUXO_
1V/div
3.3VO_
1V/div
12VO_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
PGOOD_
5V/div
t
t
t
RESP2
RESP2
RESP2
100ns/div
100ns/div
100ns/div
10 ______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Pin Description
PIN
1
NAME
FUNCTION
+12VOA
Channel A +12V Output
2
3.3VGATEA Channel A +3.3V External N-Channel MOSFET Gate Drive. 3.3VGATEA driven by +12VIN.
3.3VSENA Channel A External 3.3V Current-Sense Input
3
4
3.3VOA
ONA
Channel A +3.3V Output Sense
Channel A Master ON/OFF Output Control. Drive ONA logic high to enable channel A +3.3V, +5V, and
5
12V outputs. V
must be > UVLO threshold.
+12VIN
Channel B Master ON/OFF Output Control. Drive ONB logic high to enable channel B +3.3V, +5V, and
6
7
8
ONB
GND
12V outputs. V
must be > UVLO threshold.
+12VIN
Ground
Channel A Power-Good Output. PGOODA is an open-drain output that pulls low when a fault is detected on
channel A outputs.
PGOODA
Channel B Power-Good Output. PGOODB is an open-drain output that pulls low when a fault is detected on
channel B outputs.
9
PGOODB
AUXONA
AUXONB
Channel A 3.3VAUX ON/OFF Control Input. Drive AUXONA logic high to enable channel A +3.3V auxiliary
output.
10
11
Channel B 3.3VAUX ON/OFF Control Input. Drive AUXONB logic high to enable channel B +3.3V auxiliary
output.
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
3.3VAUXOA Channel A 3.3VAUX Output
3.3VAUXIN 3.3VAUX Input. Provides power to the +3.3V auxiliary channels.
3.3VAUXOB Channel B 3.3VAUX Output
-12VOB
-12VIN
-12VOA
5VOB
Channel B -12V Output
-12V Input
Channel A -12V Output
Channel B +5V Output Sense
Channel B External +5V Current-Sense Input
5VSENB
5VGATEB Channel B +5V External N-Channel MOSFET Gate Drive. 5VGATEB driven by +12VIN.
5VOA
Channel A +5V Output Sense
5VSENA
Channel A External +5V Current-Sense Input
5VGATEA Channel A +5V External N-Channel MOSFET Gate Drive. 5VGATEA driven by +12VIN.
3.3VOB Channel B +3.3V Output Sense
3.3VSENB Channel B External +3.3V Current-Sense Input
3.3VGATEB Channel B +3.3V External N-Channel MOSFET Gate Drive. 3.3VGATEB driven by +12VIN.
+12VOB
+12VIN
Channel B +12V Output
+12V Input. +12VIN powers the main supplies of the MAX5915/MAX5915A/MAX5916/MAX5916A.
______________________________________________________________________________________ 11
Dual PCI 2.2 Hot-Swap Controllers
Table 1. PCI Standard Maximum Values
SUPPLY VOLTAGE (V)*
VOLTAGE TOLERANCE (%)
MAX CURRENT (A)
MAX POWER (W)
+5
5
0.3V
5
5
25
25
+3.3
+12
7.6
0.5
6
-12
10
10
10
0.1
1.2
+3.3 aux (enabled)
+3.3 aux (disabled)
0.375
0.02
1.24
0.066
*Supply voltage is referenced to the output of the MAX5915/MAX5916.
auxiliary supply is not used.
Detailed Description
The MAX5915/MAX5915A/MAX5916/MAX5916A are cir-
cuit-breaker ICs for hot-swap applications where a PCI
The auxiliary supply (3.3VAUXO_) is available after both
of these events have occurred:
card is inserted into a slot that is connected to a live
backplane. Normally, when a card is plugged into a live
backplane, the card’s discharged capacitors provide a
low-impedance path that can momentarily cause the
main power supply to collapse. Both devices provide
startup current limiting and undervoltage/overcurrent
monitoring of two separate PCI card slots. Current limit-
ing and short-circuit protection are achieved using
external n-channel MOSFETs on the +3.3V and +5V
supply lines and internal MOSFETs on the 12V and
+3.3V auxiliary supply lines.
•
•
V
is above its UVLO threshold.
3.3VAUXIN
AUXON_ is driven high.
Normal Operation +3.3V, +5V,
12V Outputs
The internal circuitry for these devices monitors the out-
put voltage on all channels except the -12V supply. All
outputs are monitored for overcurrent. An undervoltage
condition occurs when any supply’s output voltage falls
below the set undervoltage level. An overcurrent fault
occurs when a monitored output current reaches the
set overcurrent threshold. Each supply has its own
overcurrent and undervoltage thresholds. If any of the
monitored voltages fall below their respective under-
voltage level, or if any of the monitored output currents
reach their overcurrent threshold, for a time period,
External sense resistors monitor the output currents of
the +3.3V and +5V supplies. These external sense
resistors adjust the overcurrent trip threshold. PCI stan-
dards dictate maximum values for the supply power
and total power drawn from the backplane. The maxi-
mum power that any one PCI board can draw is 25W.
Table 1 lists PCI standard maximum voltage, current,
and power for each supply.
t
, the controller disables the channel with the fault
DELAY
condition (see the Fault Management section).
External sense resistors monitor current through the
external MOSFETs of the +3.3V and +5V outputs, while
the current for the 12V supplies are internally monitored.
A fault condition on one of the main outputs causes all
the channel’s main outputs to shut down after t
and then either latch off (MAX5915/MAX5915A) or auto-
matically restart after t (MAX5916/MAX5916A).
Table 1 illustrates that both the +5V and +3.3V supplies
can draw up to 25W. Total combination of output power
should be limited to 25W based on PCI standard.
DELAY
Startup Mode
The +12V input powers the internal circuitry of these
devices. The main supply outputs (3.3VO_, 5VO_,
+12VO_, and -12VO_) can become active only after
both of the following events have occurred:
RESTART
A fault on any of the channel’s main outputs does not
affect the channel’s auxiliary outputs.
Normal Operation +3.3V Auxiliary Output
Auxiliary output voltage and current are monitored inter-
nally. The +3.3V auxiliary output is independent of the
main outputs but the main outputs are dependent on
the auxiliary outputs. Fault conditions on the main out-
puts do not affect the auxiliary. A fault on the auxiliary
supply causes the controller to disable all of the affected
•
V
is above its undervoltage lockout (UVLO)
+12VIN
threshold.
•
ON_ is driven high.
Figure 1 displays typical startup waveforms. The main
supplies can be enabled without using the auxiliary
supply; however, PGOOD_ remains in a low state if the
12 ______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
+12V
UVLO THRESHOLD
+12VIN
3.3VAUX UVLO THRESHOLD
3.3VAUXIN
ON_
AUXON_
+12VO_
-12VO_
5VO_
3.3VO_
3.3VAUXO_
PGOOD_
t
START
TIMING NOT TO SCALE
Figure 1. Startup Waveforms
channel outputs, auxiliary and main. A fault condition
occurs when the output voltage falls below the set
undervoltage threshold or the output current reaches the
overcurrent threshold. When a fault occurs, all supplies
of the affected channel are disabled after a time period
sense resistors and the current-limit threshold set the
brickwall current limits. A fault occurs when the load
current reaches the brickwall limit. The main outputs
shut down after t
if the fault remains. The brick-
DELAY
wall feature limits inrush current caused by positive
supply voltage steps.
t
. All outputs are automatically restarted after a
DELAY
time equal to t
. This reset is built into all devices.
RESTART
Foldback
The 12V and +3.3V auxiliary supplies employ an
internal current-foldback scheme. The MAX5915/
MAX5915A/MAX5916/MAX5916A gradually limit the load
current once the current-foldback threshold is reached. If
the overcurrent condition lasts longer than a fast tran-
sient, the output current is reduced to the foldback cur-
Current Limits
All supplies are protected against output overcurrent or
short-circuit conditions. The MAX5915/MAX5915A and
MAX5916/MAX5916A employ a “brickwall” current limit
on the +3.3V and +5V supplies and a current-foldback
scheme on the 12V and +3.3V auxiliary supplies.
rent limit and remains at that level for t
unless the
DELAY
Brickwall
A brickwall current limit protects the +3.3V and +5V
main supplies by limiting the load current. The external
overcurrent condition is cleared. See the Typical
Operating Characteristics.
______________________________________________________________________________________ 13
Dual PCI 2.2 Hot-Swap Controllers
+12V UVLO THRESHOLD
+12VIN
3.3VAUX UVLO THRESHOLD
3.3VAUXIN
ON_
AUXON_
+12VO_
5VO_
3.3VO_
-12VO_
3.3VAUXO_
PGOOD_
t
t
t
t
START
DEG.UVLO
START
DEG.UVLO
TIMING NOT TO SCALE
Figure 2. Input UVLO Fault Management in the MAX5915/MAX5915A/MAX5916/MAX5916A
Latched Fault Protection
Input Undervoltage Lockout
The MAX5915/MAX5915A latch off the appropriate
channel’s main outputs. Toggling +12VIN or ON_
restarts the main outputs. Figure 3 outlines the logic for
the main and auxiliary shutdown control of the
MAX5915, while fault handling is shown in Figures 5
and 6.
UVLO prevents these devices from turning on
internal/external MOSFETs until the input voltage exceeds
the lockout threshold. The UVLO protects the MOSFETs
from insufficient gate-drive voltage. Figure 2 shows that if
an input undervoltage condition exists for more than
t
, the outputs are disabled and PGOOD_ goes
DEG,UVLO
low immediately. The time delay t
is negative
DEG,UVLO
edge delayed and acts as a deglitch.
Autoretry Fault Protection
The MAX5916/MAX5916A automatically restart the out-
puts after t
. The MAX5915/MAX5915A/
Fault Management
When a fault is detected on one of the main outputs, the
MAX5915/MAX5915A/MAX5916/MAX5916A disable the
RESTART
MAX5916/MAX5916A handle faults on the auxiliary out-
puts by automatically restarting the appropriate chan-
nel. Figure 4 outlines the logic for the main and auxiliary
shutdown control of the MAX5916, while fault handling
is shown in Figures 6 and 7.
channel outputs after t . A fault occurs when any of
DELAY
the output voltages fall below their output undervoltage
threshold or any of the output currents exceed their out-
put overcurrent threshold. PGOOD_ pulls low if a fault
Output Overcurrent
External sense resistors monitor the current on the +5V
and +3.3V outputs, while the +3.3V auxiliary and 12V
output currents are monitored internally. Figures 5, 6,
and 7 show overcurrent fault management for the
MAX5915/MAX5915A/MAX5916/MAX5916A.
persists for more than t
. The channel with the fault is
RESP
disabled after t
. The MAX5915/MAX5916 are avail-
DELAY
able with a response time of 1.5ms (t
). The
RESP
MAX5915A/MAX5916A offer a response time of 100ns
(t ). If the fault is removed before t , the chan-
RESP2
DELAY
nel remains on and PGOOD_ pulls high immediately.
14 ______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
ENABLE_+12VIN
MAIN ON
HIGH = MAIN SUPPLIES
ARE TURNED OFF
STARTUP_+12VIN
AUX OFF
ENABLE_3.3VAUXIN
HIGH = AUX SUPPLY
TURNED OFF
V
t
D
Q
Q
RESTART
STARTUP_3.3VAUXIN
RESET
t
RESTART
POSITIVE EDGE
TRIGGERED D FLIP-FLOP,
RESET IS ACTIVE LOW
OC_3.3VAUXO_
UV_3.3VAUXO_
t
DELAY
RESET
V = INTERNAL SUPPLY LOGIC
GENERATED BY THE 12VIN OR THE
3.3VAUXIN, WHICHEVER IS HIGHER
OC_3.3VO_
OC_5VO_
V
D
Q
Q
t
DELAY
RESET
OC_+12VO_
OC_-12VO_
UV_3.3VO_
t
DELAY
POSITIVE EDGE TRIGGERED D FLIP-FLOP,
RESET IS ACTIVE LOW
UV_5VO_
UV_+12VO_
SEE TABLE 2 FOR EXPLANATION OF SIGNALS.
Figure 3. Main and Auxiliary Supply Shutdown Control Logic for MAX5915/MAX5915A
Output Undervoltage
PGOOD_ Operation
The output voltages on all supplies, except the -12V
supply, are monitored for undervoltage. Output under-
voltage fault management is identical to the output
overcurrent fault management. Figures 5, 6, and 7 can
be used to illustrate undervoltage faults on the
MAX5915/MAX5915A/MAX5916/MAX5916A.
The MAX5915/MAX5915A/MAX5916/MAX5916A incor-
porate a PGOOD_ output to report when power is good
to a microprocessor or controller. PGOOD_ remains low
if the auxiliary outputs are not powered, for PCI and
compact PCI systems where the 3.3VAUX is not avail-
able. Connect 3.3VAUXIN to 3.3VIN and connect
AUXON_ to ON_ to allow PGOOD_ to transition high
when the main supplies are available. The open-drain
structure of PGOOD_ requires an external pullup resis-
tor (see the Functional Diagram). Figure 8 shows the
internal logic of the PGOOD_ output.
Thermal Shutdown Control
The MAX5915/MAX5915A/MAX5916/MAX5916A feature
internal thermal protection. Two thresholds detect when
the device is overheated. If the first threshold is reached,
the channel that is in overcurrent shuts down. If the sec-
ond thermal threshold is reached, the entire device shuts
down. The device cannot be restarted until the thermal
condition is cleared. For the MAX5915, the main chan-
nels turn back on after +12VIN or ON_ is toggled. For the
MAX5916, the main channels turn back on after
t
. The auxiliary channels for the MAX5915/
RESTART
MAX5915A/MAX5916/MAX5916A restart after t
.
RESTART
______________________________________________________________________________________ 15
Dual PCI 2.2 Hot-Swap Controllers
ENABLE_+12VIN
MAIN OFF
HIGH = MAIN SUPPLIES
ARE TURNED OFF
STARTUP_+12VIN
ENABLE_3.3VAUXIN
V
AUX OFF
HIGH = AUX SUPPLY
TURNED ON
t
D
Q
Q
RESTART
STARTUP_3.3VAUXIN
RESET
POSITIVE EDGE
TRIGGERED D FLIP-FLOP,
RESET IS ACTIVE LOW
OC_3.3VAUXO_
UV_3.3VAUXO_
t
DELAY
RESET
V = INTERNAL SUPPLY LOGIC
GENERATED BY THE 12VIN OR THE
3.3VAUXIN, WHICHEVER IS HIGHER
V
OC_3.3VO_
OC_5VO_
D
Q
Q
t
RESTART
t
DELAY
RESET
OC_+12VO_
OC_-12VO_
UV_3.3VO_
t
DELAY
RESET
POSITIVE EDGE TRIGGERED D FLIP-FLOP,
RESET IS ACTIVE LOW
UV_5VO_
UV_+12VO_
SEE TABLE 2 FOR EXPLANATION OF SIGNALS.
t
RESTART
Figure 4. Main and Auxiliary Supply Shutdown Control Logic for MAX5916/MAX5916A
Sense Resistors
Applications Information
The overcurrent sense voltage threshold on the +3.3V
output is 46mV and 31mV on the +5V output. Choose a
sense resistor using the following equation:
Component Selection
External MOSFETs
Select the external n-channel MOSFETs according to
the application’s current requirement. Limit switch power
R
= (V-
/ I
)
SENSE
ILIM LOAD
where ILOAD is the brickwall current limit for the output.
dissipation by choosing a MOSFET with an R
low
DS(ON)
enough to have a minimum voltage drop at full load.
High R causes output ripple if the board has
Choose the sense resistors’ power rating to accommo-
date the overload current:
DS(ON)
pulsing loads. High R
can trigger an external
DS(ON)
P
= (I
)2 x R
SENSE
LOAD SENSE
undervoltage fault at full load. Determine the MOSFET’s
power rating requirement to accommodate a short-cir-
cuit condition on the board during startup (see the
External MOSFET Thermal Considerations section).
Table 3 lists MOSFET and sense resistor manufacturers.
Additional External Gate Capacitance
Connecting an external capacitance from the gates of
the external MOSFETs to GND slows the turn on of the
+5V and +3.3V supplies.
16 ______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Table 2. Logic Diagram Signal Descriptions
SIGNAL NAME
DESCRIPTION
Signal is HIGH:
1. +12VIN > V
2. ON_ = HIGH
UVLO, +12V
Enable_+12VIN
3. Thermal shutdown NOT active
Signal is HIGH:
1. +12VIN > V
UVLO, +12V
Startup_+12VIN
2. ON_ = HIGH
3. has elapsed
t
START
Signal is HIGH
1. 3.3VAUXIN > V
2. AUXON_ = HIGH
3. Thermal shutdown NOT active
UVLO, AUX
Enable_3.3VAUXIN
Startup_3.3VAUXIN
Signal is HIGH:
1. 3.3VAUXIN > V
UVLO, AUX
2. AUXON_ = HIGH
3. has elapsed
t
START
OC_
UV_
Signal is HIGH when an overcurrent condition exists on the output of the supply.
Signal is HIGH when an undervoltage condition exists on the output of the supply.
Maximum Load Capacitance
Layout Considerations
To take full advantage of the switch response time to an
Large capacitive loads can cause a problem when
inserting discharged PCI cards into the live backplane.
If the time needed to charge the capacitance of the
board is greater than the typical startup time, 50ms, a
fault can occur after startup.
output fault condition, keep all traces as short as possi-
ble and maximize the high-current trace dimensions to
reduce the effect of undesirable parasitic inductance.
Place the MAX5915/MAX5915A/MAX5916/MAX5916A
close to the PCI card’s connector. Use a ground plane
to minimize impedance and inductance. Minimize the
current-sense resistor trace length and ensure accurate
current sensing with Kelvin connections (Figure 9).
The MAX5915/MAX5915A/MAX5916/MAX5916A are able
to withstand large capacitive loads due to their long start-
up time. Each supply has its own current-limit threshold.
Calculate the maximum load capacitance as follows:
When an output is short circuited, the voltage drop
across the external MOSFET becomes large. Hence the
power dissipation across the switch and die tempera-
ture both increase. An efficient way to achieve good
power dissipation on a surface-mount package is to lay
out two copper pads directly under the package on
both sides of the board. Connect the two pads to the
ground plane through vias, and use enlarged copper
mounting pads on the topside of the board.
C
< 50ms x I
/ V
BOARD
_, LIM SUPPLY
Input Transients
The +12V and +3.3VAUX supplies must be above their
respective UVLO thresholds before startup can occur.
Input transients can cause the input voltage to sag
below the UVLO threshold. The MAX5915/MAX5915A/
MAX5916/MAX5916A reject input transients that are
shorter than t
.
DEG, UVLO
External MOSFET Thermal
Considerations
Chip Information
TRANSISTOR COUNT: 1021
The power dissipation of the external MOSFET is low
2
when it is on, P = I
x R
. A considerable
D
LOAD
DS(ON)
amount of power is dissipated during startup and con-
tinuous short-circuit conditions. The design must take
into consideration the worst-case scenario.
PROCESS: BiCMOS
______________________________________________________________________________________ 17
Dual PCI 2.2 Hot-Swap Controllers
+12VIN
+12V UVLO THRESHOLD
OVERCURRENT THRESHOLD
IOUT
(+12VO_, 5VO_, 3.3VO-, OR -12VO_)
ON_
+12VO_
5VO_
3.3VO_
t
DEG
-12VO_
3.3VAUXO_
PGOOD_
t
RESP
(t
)
RESP2
t
t
START
DELAY
OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE.
( ) FOR MAX5915A.
Figure 5. Main Outputs Overcurrent Fault Management in the MAX5915/MAX5915A
18 ______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
+12VIN
+12V UVLO THRESHOLD
OVERCURRENT
UVLO THRESHOLD
IOUT
(3.3VAUXO_)
ON_
+12VO_
5VO_
3.3VO_
t
DEG
-12VO_
3.3VAUXO_
PGOOD_
t
RESP
(t
)
RESP2
t
t
t
START
DELAY
RESTART
OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE.
( ) FOR MAX5915A/MAX5916A.
Figure 6. Auxiliary Outputs Overcurrent Fault Management in the MAX5915/MAX5915A/MAX5916/MAX5916A
______________________________________________________________________________________ 19
Dual PCI 2.2 Hot-Swap Controllers
+12VIN
+12V UVLO THRESHOLD
OVERCURRENT THRESHOLD
IOUT
(+12VO_, 5VO_, 3.3VO_, OR- 12VO_)
ON_
+12VO_
5VO_
3.3VO_
-12VO_
3.3VAUXO_
PGOOD_
t
RESP
(t
)
RESP2
t
t
t
START
DELAY
RESTART
OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE.
( ) FOR MAX5916A.
Figure 7. Main Outputs Overcurrent Fault Handling in the MAX5916/MAX5916A
20 ______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
t
t
DEG
t
DEG, UVLO
ON_
UVLO_+12VIN
AUXON_
DEG
t
START
t
t
DEG, UVLO
t
START
PGOOD_
t
DEG
UVLO_3.3VAUXIN
DEG, UVLO
GND
OC_MAIN_OUTPUTS
UV_MAIN_OUTPUTS
t
RESP
t
RESP
(t
)
RESP2
OC_3.3VAUXO_
UV_3.3VAUXO_
( ) FOR MAX5915A/MAX5916A.
Figure 8. PGOOD_ Logic Diagram
______________________________________________________________________________________ 21
Dual PCI 2.2 Hot-Swap Controllers
Table 3. Component Manufacturers
COMPONENT
MANUFACTURER
PHONE
WEBSITE
www.vishay.com
Dale-Vishay
402-564-3131
704-264-8861
888-522-5372
310-322-3331
602-244-3576
Sense Resistors
IRC
www.irctt.com
Fairchild
www.fairchildsemi.com
www.irf.com
MOSFETs
International Rectifier
Motorola
www.mot-sps.com/ppd/
Pin Configuration
HIGH-CURRENT PATH
TOP VIEW
+12VOA
3.3VGATEA
3.3VSENA
3.3VOA
ONA
1
2
3
4
5
6
7
8
9
28 +12VIN
27 +12VOB
26 3.3VGATEB
25 3.3VSENB
24 3.3VOB
SENSE RESISTOR
MAX5915
ONB
23 5VGATEA
22 5VSENA
21 5VOA
MAX5915A
MAX5916
MAX5916A
MAX5915
GND
MAX5915A
MAX5916
MAX5916A
PGOODA
PGOODB
20 5VGATEB
19 5VSENB
18 5VOB
AUXONA 10
AUXONB 11
Figure 9. Kelvin Connections for Sense Resistors
3.3VAUXOA 12
3.3VAUXIN 13
3.3VAUXOB 14
17 -12VOA
16 -12VIN
15 -12VOB
Selector Guide
FAULT
MANAGEMENT
PGOOD_ FAULT
RESPONSE TIME (S)
PART
TSSOP
MAX5915EUI
MAX5915AEUI
MAX5916EUI
MAX5916AEUI
Latched
Latched
1.5m
100n
1.5m
100n
Autorestart
Autorestart
22 ______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Circuit
+12V
3.3VAUX
-12V
+12VIN
3.3VAUXIN
-12VIN
PCI CARD A
PCI SLOT A
BACKPLANE
PCI SLOT B
PCI CARD B
+12V
+12V
+12VOA
+12VOB
-12VOA
-12VOB
3.3VAUXOB
5VOB
-12V
-12V
3.3VAUX
3.3VAUXOA
5VOA
3.3VAUX
5VSENA
5VGATEA
ONA
MAX5915
MAX5915A
MAX5916
MAX5916A
5VSENB
5VGATEB
ON
ON
OFF
+5V
OFF
+5V
ONB
+5V
+5V
+3.3V
GND
+3.3V
GND
+3.3V
OFF
+3.3V
OFF
PGOODA
AUXONA
3.3VGATEA
3.3VSENA
3.3VOA
PGOODB
AUXONB
ON
ON
3.3VGATEB
3.3VSENB
3.3VOB
GND
______________________________________________________________________________________ 23
Dual PCI 2.2 Hot-Swap Controllers
Functional Diagram
+12VIN
-12VIN
3.3V
-12VOB
3.3V
-12VOA
+12VOA
+12VOB
3.3VGATEB
3.3VGATEA
CHANNEL B
CONTROL
CHANNEL A
CONTROL
3.3VSENA
3.3VSENB
R
SENSE
R
SENSE
3.3VOA
5V
3.3VOB
5V
BIAS, BANDGAP
REFERENCE, AND
UVLO
5VGATEB
5VGATEA
5VSENA
5VSENB
TEMPERATURE
SENSOR
R
R
SENSE
SENSE
MAX5915
MAX5915A
MAX5916
MAX5916A
5VOA
V
V
PULLUP
PULLUP
5VOB
CHARGE PUMP
AND GATE
CONTROL
ONA
ONB
PGOODA
PGOODB
AUXONA
3.3VAUXIN
3.3VAUXOA
AUXONB
3.3VAUXOB
GND
24 ______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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