19-2420; Rev 0; 4/02
Dual PCI 2.2 Hot-Swap Controllers
General Description
The MAX5915/MAX5916 dual PCI 2.2 hot-swap con-
trollers allow for safe insertion and removal of two PCI
cards into live PCI slots or backplanes by limiting the
inrush current at startup. After startup, the
MAX5915/MAX5916 provide protection against short-
circuit, overcurrent, and undervoltage conditions.
The MAX5915/MAX5916 provide independent power
controls for +3.3V, +5V,
±12V,
and +3.3V auxiliary sup-
plies of two PCI cards. The MAX5915/MAX5916 provide
intelligent selective thermal shutdown control that shuts
down the channel with an overcurrent fault. Both the
MAX5915 and MAX5916 include internal power
MOSFETs for the +12V, -12V, and +3.3V auxiliary out-
puts. The MAX5915/MAX5916 use internal charge
pumps to activate the gates of the internal FETs control-
ling 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 MAX5915/MAX5916 to monitor two PCI
card slots.
The MAX5915 offers latched fault protection and the
MAX5916 offers autorestart fault protection. 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.
o
PCI 2.2 Compliant
o
Independent Power Controls for +3.3V, +5V,
±12V,
and +3.3V Auxiliary Supplies of Two PCI Cards
o
Internal MOSFET Switches for
±12V
and +3.3V
Auxiliary Outputs
o
Separate ON/OFF Control Input for Each Channel
o
Independent +3.3V Auxiliary Output ON/OFF
Control
o
Overcurrent Foldback with Timeout and Shutdown
Protection for
±12V
and +3.3V Auxiliary Rails with
Status Report
o
Brick Wall with Timeout and Shutdown Protection
for +5V and +3.3V Rails with Status Report
o
Output Undervoltage Monitoring for +3.3V, +5V,
+12V, and +3.3V Auxiliary Rails with Status Report
o
+3.3V Auxiliary Autorestart
o
Intelligent Selective Thermal Shutdown Control
Shuts Down Only the Channel with an Overcurrent
Fault
o
28-Pin TSSOP Package
Features
MAX5915/MAX5916
Applications
PCI 2.2 Server
PCI Server
RAID
MAX5915EUI
MAX5916EUI
PART
Ordering Information
FAULT
MANAGEMENT
Latched
Autorestart
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
28 TSSOP
28 TSSOP
Pin Configuration, Functional Diagram, and Typical Operating
Circuit appear at end of data sheet.
Typical Application Circuit
+3.3V
FAIRCHILD
FDS6670A
0.005Ω
+5V
FAIRCHILD
FDS6670A
0.005Ω
+12V
4.7µF 0.1µF
-12V
4.7µF 0.1µF
ON
ON_
OFF
10kΩ
ON
AUXON_
OFF
10kΩ
GND
PGOOD_
+3.3VAUX
4.7µF 0.1µF
3.3VGATE_
+12VIN
-12VIN
3.3VAUXIN
3.3VSEN_
3.3VO_
5VGATE_
5VSEN_
5VO_
+12VO_
-12VO_
3.3VAUXO_
47µF
5V
470µF
470µF
47µF
47µF
MAX5915
MAX5916
________________________________________________________________
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
MAX5915/MAX5916
ABSOLUTE MAXIMUM RATINGS
+12VIN to GND ...................................................-0.3V to +14.0V
-12VIN to GND........................................................-14V to +0.3V
-12VO_ to GND......................................+0.3V to (V
-12VIN
- 0.3V)
+12VO_, 3.3VGATE_, 5VGATE_
to GND..................................................-0.3V to (V
+12VIN
+ 0.3V)
Any Other Pin to GND ...........................................-0.3V to +6.0V
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TSSOP (derate 23.8mW/°C above +70°C) ...........1.9W
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
-12VIN
= -12V, V
+12VIN
= +12V, V
3.3VAUXIN
= +3.3V, V
ON_
= V
AUXON_
= +5V, T
A
= -40°C to +85°C, unless otherwise specified.
Typical values are at T
A
= +25°C.)
PARAMETER
POWER SUPPLIES
Main Supply Input Voltage
Range
Main Supply Undervoltage
Lockout (UVLO)
Main Supply UVLO Hysteresis
Main Input UVLO Delay Time
Supply Current
+3.3V SUPPLY CONTROL
Gate Charge Current
Gate Discharge Current
Gate High Voltage
Gate Low Voltage
3.3VO_ Input Bias Current
3.3VO_ Internal Pulldown
3.3VSEN_ Input Bias Current
Current-Limit Threshold
Output Undervoltage Threshold
Output Undervoltage Threshold
Hysteresis
I
3.3VGATE_, CHG
I
3.3VGATE_, DIS
V
3.3VGATE_, HIGH
V
3.3VGATE_, LOW
I
3.3VO_, BIAS
R
PD
I
3.3VSEN_, BIAS
V
3.3V, LIM
V
3.3VIN, UV
V
3.3VGATE
_ = +6V, V
3.3VSEN_
= +3.3V,
V
3.3VO
_ = +3.3V
V
3.3VGATE
_ = +12V, V
ON_
= 0
I
3.3VGATE
_ = 1µA
I
3.3VGATE
_ = 1µA, V
ON
_ = 0
V
3.3VO
_ = +3.3V
V
ON
_ = 0
V
3.3VSEN
_ = +3.3V
V
3.3VGATE
_ = +6V
V
3.3VGATE
_ falling
41
2.79
46
2.89
30
1
10
51
2.99
5
50
V
+12VIN
-
0.5
0.1
15
150
30
250
V
+12VIN
0.4
20
µA
µA
V
V
µA
kΩ
µA
mV
V
mV
V
+12VIN
V
+12UVLO
V
UVLO, HYS
t
DEG, UVLO
I
Q
Figures 1 and 2 (Note 1)
V
+12VIN
rising
10.8
9.6
12
10
100
1.6
2.5
5.0
13.2
10.8
V
V
mV
ms
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
-12VIN
= -12V, V
+12VIN
= +12V, V
3.3VAUXIN
= +3.3V, V
ON_
= V
AUXON_
= +5V, T
A
= -40°C to +85°C, unless otherwise specified.
Typical values are at T
A
= +25°C.)
PARAMETER
+5V SUPPLY CONTROL
Gate Charge Current
Gate Discharge Current
Gate High Voltage
Gate Low Voltage
5VO_ Input Bias Current
5VO_ Internal Pulldown
5VSEN_ Input Bias Current
Current-Limit Threshold
Output Undervoltage Threshold
Output Undervoltage Threshold
Hysteresis
+12V SUPPLY CONTROL
On-Resistance of Internal Switch
Foldback Current Limit
Current-Foldback Threshold
Output Undervoltage Threshold
+12VO_ Internal Pulldown
-12V SUPPLY CONTROL
On-Resistance of Internal Switch
Foldback Current Limit
Current-Foldback Threshold
-12VO_ Internal Pullup
+3.3VAUX SUPPLY CONTROL
Input Voltage Range
3.3VAUXIN Undervoltage
Lockout
Hysteresis
Supply Current
R
-12VO_, PU
V
3.3VAUXIN
V
UVLO, AUX
V
UVLO-AUX, HYS
I
Q, 3.3VAUX
Input rising
R
DS(ON), -12V
I
-12VIN, LIM
T
A
= +25°C, I
D
= 0.1A
T
A
= +85°C, I
D
= 0.1A
V
-12VO_
= 0
Output current rising (Note 2)
V
ON_
= 0
3.0
2.65
136
205
240
1
3.3
2.75
30
1
2
3.6
2.85
0.58
0.9
1.3
273
Ω
mA
mA
kΩ
V
V
mV
mA
V
+12VO
_
, UV
R
+12VO
_
, PD
R
DS(ON), +12V
I
+12VIN, LIM
T
A
= +25°C, I
D
= 0.5A
T
A
= +85°C, I
D
= 0.5A
V
+12VO
_ = 0
Output current rising (Note 2)
Output falling
V
ON
_ = 0
10.00
0.68
1
1.4
10.4
1
10.82
0.32
0.38
0.5
1.36
Ω
A
A
V
kΩ
I
5VGATE
_
, CHG
I
5VGATE
_
, DIS
V
5VGATE
_
, HIGH
V
5VGATE
_
, LOW
I
5VO
_
, BIAS
R
5VO
_
, PD
I
5VSEN
_
, BIAS
V
5VO
_
, LIM
V
5VO
_
, UV
V
5VGATE
_ = +6V, V
5VSEN
_ = +5V,
V
5VO
_ = +5V
V
5VGATE
_ = +12V, V
ON
_ = 0
I
5VGATE
_ = 1µA
I
5VGATE
_ = 1µA, V
ON
_ = 0
V
5VO
_ = +5V
V
ON
_ = 0
V
5VSEN
_ = +5V
V
5VGATE
_ falling
Output falling
27
4.34
31
4.50
45
1
10
35
4.70
5
50
V
+12VIN
-
0.5V
0.1
15
150
30
250
V
+12VIN
0.4
20
µA
µA
V
V
µA
kΩ
µA
mV
V
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5915/MAX5916
_______________________________________________________________________________________
3
Dual PCI 2.2 Hot-Swap Controllers
MAX5915/MAX5916
ELECTRICAL CHARACTERISTICS (continued)
(V
-12VIN
= -12V, V
+12VIN
= +12V, V
3.3VAUXIN
= +3.3V, V
ON_
= V
AUXON_
= +5V, T
A
= -40°C to +85°C, unless otherwise specified.
Typical values are at T
A
= +25°C.)
PARAMETER
On-Resistance of Internal Switch
Foldback Current Limit
Current-Foldback Threshold
Output Undervoltage Threshold
Auxiliary Input UVLO Delay Time
3.3VAUXO_ Internal Pulldown
ON AND AUXON COMPARATORS
Threshold Voltage
Hysteresis
Input Bias Current
ON_ and AUXON_ Deglitch
Time
V
HYS
I
B, COMP
t
DEG
Figures 5–8 (Note 3)
4
1.0
25
20
2.1
V
mV
µA
µs
V
3.3VAUXIN, UV
t
DEG, UVLO
R
3.3VAUXO_
(Note 1)
ON_ = 0
SYMBOL
R
DS(ON), 3.3VAUX
I
3.3VAUXIN, LIM
CONDITIONS
T
A
= +25°C, I
D
= 0.4A
T
A
= +85°C, I
D
= 0.4A
V
3.3VAUXO
_ = 0
Output current rising (Note 2)
2.76
0.5
0.75
1.2
2.89
1.6
1
2.99
MIN
TYP
0.24
MAX
0.4
0.6
1.0
UNITS
Ω
A
A
V
ms
kΩ
FAULT RESPONSE, PGOOD_ STATUS OUTPUT
PGOOD_ Output Overcurrent
and Undervoltage Response
Time
Output Overcurrent and
Undervoltage Deglitch Time
PGOOD_ Startup Time Out
Autorestart Delay
PGOOD_ Output Low Voltage
PGOOD_ Output High Leakage
Current
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Full Thermal Shutdown
Threshold
Full Thermal Shutdown
Hysteresis
t
RESP
Figures 5–8
0.5
16
✕
t
RESP
4
✕
t
DELAY
64
✕
t
START
0.5
0.7
1
125
5
(Note 5)
T
SD
+
20
5
1.5
ms
t
DELAY
t
START
t
RESTART
V
OL
I
LEAK
T
SD
T
HYS
T
SD, FULL
T
HYS, FULL
Figures 3–7
See Figures 1, 2, 5, 6, 7, and 8
Delay time to restart after OC and/or
UV shutdown
I
SINK
= 2mA, ON_ = 0
V
PGOOD_
= +5.5V
(Note 4)
ms
ms
ms
V
µA
°C
°C
°C
°C
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
t
DEG, UVLO
is negative edge triggered. There is no time delay when the inputs rise above the UVLO threshold.
The current threshold when the output current starts to fold back. See the
Typical Operating Characteristics.
t
DEG
is negative edge triggered. ON_ or AUXON_ transition from low to high has no delay.
Temperature threshold at which the outputs of the channel with overcurrent shut down.
The temperature threshold at which both channels shut down.
4
_______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Characteristics
(V
+12VIN
= +12V, V
3.3VAUXIN
= +3.3V, V
-12VIN
= -12V, V
5V
= +5V, V
3.3V
= +3.3V, R
5VSEN_
= 0.005Ω, R
3.3VSEN_
= 0.005Ω, C
3.3VO_
=
C
5VO_
= 470µF, C
+12VO_
= C
-12VO_
= C
3.3VAUXO_
= 47µF, T
A
= +25°C, unless otherwise noted. See
Typical Application Circuit.)
+12VO_ VOLTAGE
vs. OUTPUT CURRENT
MAX5915 toc01
MAX5915/MAX5916
+12VO_ CURRENT FOLDBACK
vs. DIFFERENTIAL SWITCH VOLTAGE
MAX5915 toc02
-12VO_ VOLTAGE
vs. OUTPUT CURRENT
MAX5915 toc03
12.1
12.0
+12VO_ VOLTAGE (V)
11.9
11.8
11.7
11.6
11.5
11.4
0
0.5
1.0
1.1
+12VO_ CURRENT FOLDBACK (A)
0.9
0.7
0.5
0.3
0.1
-0.1
-11.5
-11.6
-12VO_ VOLTAGE (V)
-11.7
-11.8
-11.9
-12.0
-12.1
1.5
0
2
OUTPUT CURRENT (A)
8
6
V
+12VIN
- V
+12VO_
(V)
4
10
12
0
50
200
100
150
OUTPUT CURRENT (mA)
250
-12VO_ CURRENT FOLDBACK
vs. DIFFERENTIAL SWITCH VOLTAGE
MAX5915 toc04
5VO_ VOLTAGE
vs. OUTPUT CURRENT
MAX5915 toc05
5VO_ SENSE RESISTOR VOLTAGE
vs. DIFFERENTIAL SWITCH VOLTAGE
5VO_ CURRENT-LIMIT THRESHOLD (mV)
38
36
34
32
30
28
26
24
22
20
1.0
DURING CURRENT LIMIT
FAIRCHILD
FDS6670A
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
MAX5915 toc06
250
-12VO_ CURRENT FOLDBACK (mA)
5.02
5.00
4.98
5VO_ VOLTAGE (V)
4.96
4.94
4.92
4.90
4.88
4.86
4.84
4.82
4.80
40
200
150
100
50
0
0
2
4
6
8
10
12
V
-12VIN
- V
-12VO_
(V)
FAIRCHILD
FDS6670A
0
1
2
3
OUTPUT CURRENT (A)
4
5
V
IN
- V
5VSEN_
(V)
3.3VO_ VOLTAGE
vs. OUTPUT CURRENT
MAX5915 toc07
3.3VO_ SENSE RESISTOR VOLTAGE
vs. DIFFERENTIAL SWITCH VOLTAGE
3.3VO_ CURRENT-LIMIT THRESHOLD (mV)
MAX5915 toc08
3.3VAUX_ VOLTAGE
vs. OUTPUT CURRENT
3.4
3.3
3.3VAUX_ VOLTAGE (V)
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
MAX5915 toc09
3.32
3.30
3.28
3.3VO_ VOLTAGE (V)
3.26
3.24
3.22
3.20
3.18
3.16
0
2
6
4
OUTPUT CURRENT (A)
8
FAIRCHILD
FDS6670A
48
46
44
42
40
38
36
34
32
30
1.0
1.5
2.0
2.5
3.0
DURING CURRENT LIMIT
FAIRCHILD
FDS6670A
3.5
3.5
0
0.15 0.30 0.45 0.60 0.75 0.90 1.05 1.20
OUTPUT CURRENT (A)
V
IN
- V
3.3VSEN_
(V)
_______________________________________________________________________________________
5
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