19-0884; Rev 0; 7/07
Triple PCI Express, Hot-Plug Controllers
General Description
The MAX5957/MAX5958 triple hot-plug controllers are
designed for PCI Express (PCIe)
®
applications. These
devices provide hot-plug control for 12V, 3.3V, and 3.3V
auxiliary supplies of three PCIe slots. The MAX5957/
MAX5958s’ logic inputs/outputs allow interfacing directly
with the system hot-plug management controller or
through an SMBus™ with an external I/O expander such
as the MAX7313. An integrated debounced attention
switch and present-detect signals simplify system design.
The MAX5957/MAX5958 drive six external n-channel
MOSFETs to control the 12V and 3.3V main outputs. The
3.3V auxiliary outputs are controlled through 0.2Ω n-chan-
nel MOSFETs. Internal charge pumps provide the gate
drive for the 12V outputs while the gate drive of the 3.3V
output is driven by the 12V input supply clamped to 5.5V
above the respective 3.3V main supply rail. The 3.3V aux-
iliary outputs are completely independent from the main
outputs with their own charge pumps.
At power-up, the MAX5957/MAX5958 keep all the
MOSFETs (internal and external) off until the supplies rise
above their respective undervoltage lockout (UVLO)
thresholds. Upon a turn-on command, the MAX5957/
MAX5958 enhance the external and internal MOSFETs
slowly with a constant gate current to limit the power-sup-
ply inrush current.
The MAX5957/MAX5958 actively limit the current to pro-
tect all outputs at all times and shut down if an overcur-
rent condition occurs. After an overcurrent fault condition,
the MAX5957L/MAX5958L latch off while the MAX5957A/
MAX5958A automatically restart after a restart time delay.
The MAX5957/MAX5958 are offered in latch-off or auto-
restart versions (see the
Selector Guide).
The MAX5957/MAX5958 are available in a 56-pin TQFN
package and operate over the -40°C to +85°C temper-
ature range.
o
PCIe Compliant
o
Hot Swap 12V, 3.3V, and 3.3V Auxiliary for 3
PCIe Slots
o
Integrated Power MOSFETs for Auxiliary Supply
Rails
o
Controls di/dt and dV/dt
o
Active Current Limiting Protects Against
Overcurrent/Short-Circuit Conditions
o
Programmable Current-Limit Timeout
o
PWRGD
Signal Outputs with Programmable
Power-On Reset (POR) (160ms Default)
o
Latched
FAULT
Signal Output After Overcurrent
or Overtemperature Fault
o
Attention Switch Inputs/Outputs with 4ms
Debounce
o
Present-Detect Inputs
o
Force-On Inputs Facilitate Testing/Debug
o
Thermal Shutdown
o
Allow Control Through SMBus with an I/O
Expander
Features
MAX5957/MAX5958
Ordering Information
PART
MAX5957AETN+
MAX5957LETN+
MAX5958AETN+
MAX5958LETN+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
56 Thin QFN
56 Thin QFN
56 Thin QFN
56 Thin QFN
PKG
CODE
T5677-1
T5677-1
T5677-1
T5677-1
Applications
Servers
Desktop Mobile Server Platforms
Workstations
Embedded Devices
+Denotes
a lead-free package.
Pin Configuration and Typical Application Circuit appear at
end of data sheet.
PCI Express is a registered trademark of PCI-SIG Corp.
SMBus is a trademark of Intel Corp.
Selector Guide
PART
MAX5957AETN+
MAX5957LETN+
MAX5958AETN+
MAX5958LETN+
√
√
√
LATCH OFF
AUTORESTART
√
GUARANTEED AUX CURRENT (mA)
375
375
550
550
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Triple PCI Express, Hot-Plug Controllers
MAX5957/MAX5958
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
12VIN......................................................................-0.3V to +14V
12G_ ..........................................................-0.3V to (V
12VIN
+ 6V)
12S_+, 12S_-, 3.3G_ ..............................-0.3V to (V
12VIN
+ 0.3V)
3.3VAUXIN, ON_,
FAULT_, PWRGD_.......................-0.3V
to +6V
PGND ....................................................................-0.3V to +0.3V
All Other Pins ..................................-0.3V to (V
3.3VAUXIN
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
56-Pin Thin QFN (derate 40mW/°C above +70°C) .....3200mW
Operating Temperature Range ...........................-40°C to +85°C
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
= V
12S_+
= V
12S_-
= 12V, V
3.3S_+
=V
3.3S_-
= V
3.3AUXIN
= V
ON_
= V
AUXON_
= V
FON_
= 3.3V,
PWRGD_
=
FAULT_
= PORADJ =
TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ =
PRES-DET_
= PGND = GND, T
A
= T
J
= -40°C to +85°C, unless otherwise
noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
PARAMETER
12V SUPPLY (MAIN)
12V Supply Input-Voltage Range
12V Undervoltage Lockout
12V Undervoltage Lockout
Deglitch Time
12V Supply Current
12VIN CONTROL
12VIN Current-Limit Threshold
(V
12S+
- V
12S-
)
12G_ Gate Charge Current
V
12ILIM
I
12G, CHG
V
12G_
= GND
Normal turn-off, ON_ = GND,
V
12G_
= 2V
12G_ Gate Discharge Current
I
12G_, DIS
Output short-circuit condition, strong
gate pulldown to regulation,
(V
12S+
- V
12S-
)
≥
1V, V
12G_
= 5V
I
12G
_ = 1µA
Referred to V
12VIN
, I
12G_
= 1µA
(Note 2)
49
4
50
54
5
150
59
6
250
mV
µA
µA
V
12VIN
V
12UVLO
t
DEG,UVLO
I
12VIN
V
12VIN
rising
Hysteresis
V
12IN
falling below V
12UVLO
to UVLO
assertion
V
12VIN
= 13.2V
10.8
9.5
12
10
0.1
30
1
2.5
13.2
10.5
V
V
µs
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
60
120
200
mA
12G_ Gate High Voltage
(V
12G_
- V
12VIN
)
12G_ Threshold Voltage for
PWRGD_
Assertion
12S_- Input Bias Current
12S_+ Input Bias Current
3.3V SUPPLY (MAIN)
3.3V Supply Voltage Range
Undervoltage Lockout (Note 3)
V
12G, H
V
PGTH12
4.8
3.0
5.3
4.0
5.8
4.8
1
V
V
µA
µA
V
V
mV
10
V
3.3S_+
3.3SA+ rising
Hysteresis
3.0
2.50
3.3
2.65
30
30
3.6
2.78
2
_______________________________________________________________________________________
Triple PCI Express, Hot-Plug Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
12VIN
= V
12S_+
= V
12S_-
= 12V, V
3.3S_+
=V
3.3S_-
= V
3.3AUXIN
= V
ON_
= V
AUXON_
= V
FON_
= 3.3V,
PWRGD_
=
FAULT_
= PORADJ =
TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ =
PRES-DET_
= PGND = GND, T
A
= T
J
= -40°C to +85°C, unless otherwise
noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
PARAMETER
3.3V CONTROL
3.3V Current-Limit Threshold
(V
3.3S_+
- V
3.3S_-
)
3.3G_ Gate Charge Current
V
3.3ILIM
I
3.3G_,CHG
V
3.3G_
= GND
Normal turn-off, ON_ = GND,
V
3.3G
_ = 2V
3.3G_ Gate Discharge Current
I
3.3G_, DIS
Output short-circuit condition, strong
gate pulldown to regulation,
V
3.3S
_+ - V
3.3S_-
≥
1V, V
3.3G-
= 5V
I
SOURCE
= 1µA
Referred to V
3.3AUXIN
, I
3.3G_
= 1µA
(Note 2)
17
4
50
20
5
150
23
6
250
mV
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5957/MAX5958
90
150
250
mA
3.3G_ Gate High Voltage
(V
3.3G_
- V
3.3S_+
)
3.3G_ Threshold Voltage for
PWRGD_
Assertion
3.3S_- Input Bias Current
3.3S_+ Input Bias Current
3.3V AUXILIARY SUPPLY
3.3VAUXIN Supply Input Voltage
Range
3.3VAUXIN Undervoltage
Lockout
3.3VAUXIN Supply Current
3.3VAUXIN to 3.3VAUXO
Maximum Dropout
3.3VAUXO_ Current-Limit
Threshold
3.3VAUXO_ Threshold for
PWRGD_
Assertion (V3.3VAUXIN
- V3.3VAUXO)
LOGIC SIGNALS
Input-Logic Threshold (ON_,
FON_,
AUXON_,
PRES-DET_,
INPUT_)
Input Bias Current (ON_,
AUXON_, INPUT_)
FON_, PRES-DET_
Internal Pullup
ON_, AUXON_ High-to-Low
Deglitch Time
V
3.3G_H
V
PGTH3.3
4.5
3.0
5.5
4.0
6.8
4.5
1
V
V
µA
µA
20
60
V
3.3AUXIN
V
3.3VAUXUVLO
V
3.3VAUXIN
rising
Hysteresis
V
3.3VAUXIN
= 3.6V
I
3.3VAUXO
= 375mA (MAX5957)
I
3.3VAUXO
= 550mA (MAX5958)
3.3VAUXO_ shorted
to GND
V
PGTH3.3AUX
(Note 2)
MAX5957
MAX5958
3.0
2.50
3.3
2.65
30
2.5
3.6
2.78
5
225
280
V
V
mV
mA
mV
mA
376
560
450
700
564
850
400
mV
Rising edge
Hysteresis
1.0
25
2.0
V
mV
1
25
50
4
75
µA
kΩ
µs
_______________________________________________________________________________________
3
Triple PCI Express, Hot-Plug Controllers
MAX5957/MAX5958
ELECTRICAL CHARACTERISTICS (continued)
(V
12VIN
= V
12S_+
= V
12S_-
= 12V, V
3.3S_+
=V
3.3S_-
= V
3.3AUXIN
= V
ON_
= V
AUXON_
= V
FON_
= 3.3V,
PWRGD_
=
FAULT_
= PORADJ =
TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ =
PRES-DET_
= PGND = GND, T
A
= T
J
= -40°C to +85°C, unless otherwise
noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
PARAMETER
PRES-DET_
High-to-Low Deglitch
Time
SYMBOL
t
DEG
V
PORADJ
= GND
PWRGD_
Power-On Reset
Deglitch Time (Note 2)
PORADJ = unconnected
t
POR_HL
R
PORADJ
= 20kΩ
R
PORADJ
= 100kΩ
R
PORADJ
= 200kΩ
PWRGD_
Low-to-High Deglitch
Time
PWRGD_, FAULT_
Output Low
Voltage
PWRGD_, FAULT_
Output High
Leakage Current
t
POR_LH
I
SINK
= 2mA
I
SINK
= 30mA
PWRGD_, FAULT_
= 5.5V
TIM = open
FAULT_
Timeout
t
FAULT
R
TIM
= 15kΩ
R
TIM
= 120kΩ
R
TIM
= 300kΩ
FAULT_
Timeout During Startup
t
SU
5.5
1.4
12
11
2.6
22
53
2x
t
FAULT
64 x
t
FAULT
(Note 4)
T
J
rising
2.6
I
SOURCE
= 2mA
I
SINK
= 2mA
V
3.3AUXIN
- 0.3
100
150
20
t
DBC
4.4
6.2
V
3.3AUXIN
0.4
ms
90
35
145
160
55
265
530
4
0.1
0.8
1
17
3.8
32
ms
µs
V
µA
CONDITIONS
MIN
3
TYP
5
MAX
7
1
250
75
380
ms
UNITS
ms
µs
Autorestart Delay Time
Fault Reset Minimum Pulse Width
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
OUT_ Debounce Time
OUT_ Voltage High
OUT_ Voltage Low
t
RESTART
t
RESET
t
SD
ms
µs
°C
ms
V
V
Note 1:
Note 2:
Note 3:
Note 4:
All devices are 100% production tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
PWRGD_
asserts a time t
POR_HL
after V
PGTH12,
V
PGTH3.3,
and V
PGTH3.3AUX
conditions are met.
The UVLO for the 3.3V supply is sensed at 3.3S_+.
This is the time that ON_ or AUXON_ must stay low when resetting a fault condition.
4
_______________________________________________________________________________________
Triple PCI Express, Hot-Plug Controllers
Typical Operating Characteristics
(V
12VIN
= V
12S_+
= 12V, V
3.3S_+
= V
3.3S_-
= V
3.3AUXIN
= V
ON_
= V
AUXON_
= V
FON_
= 3.3V,
PWRGD_
=
FAULT_
= PORADJ = TIM =
OUTPUT_ = OPEN, INPUT_ =
PRES-DET_
= PGND = GND. See the
Typical Application Circuit.)
12V INPUT SUPPLY CURRENT
vs. TEMPERATURE
MAX5957 toc01
MAX5957/MAX5958
3.3VAUXIN SUPPLY CURRENT
vs. TEMPERATURE
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
MAX5957 toc02
ON_ AND AUXON_ LOW-TO-HIGH THRESHOLD
VOLTAGE vs. TEMPERATURE
1.55
THRESHOLD VOLTAGE (V)
1.50
1.45
1.40
1.35
1.30
1.25
1.20
AUXON_ THRESHOLD
ON_ THRESHOLD
MAX5957 toc03
1.10
1.08
1.06
SUPPLY CURRENT (mA)
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
-40
-15
10
35
60
5.0
3.3VAUXIN SUPPLY CURRENT (mA)
1.60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3.3VAUXO_ OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX5957 toc04
12G_ AND 3.3G_ GATE CHARGE
CURRENT vs. TEMPERATURE
5.15
GATE CHARGE CURRENT (µA)
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
150
-40
-15
10
35
60
85
-40
3.3G_
12G_
MAX5957 toc05
12G_ AND 3.3G_ GATE DISCHARGE
CURRENT vs. TEMPERATURE
MAX5957 toc06
4.0
3.5
OUTPUT VOLTAGE (V)
3.0
MAX5957
2.5
2.0
1.5
1.0
0.5
0
0
MAX5958
5.20
180
GATE DISCHARGE CURRENT (µA)
175
170
165
160
12G_
155
3.3G_
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
OUTPUT CURRENT (A)
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
3.3VAUX INTERNAL SWITCH
MAXIMUM DROPOUT vs. TEMPERATURE
12V AND 3.3V CURRENT-LIMIT THRESHOLD (mV)
0.18
0.16
DROPOUT VOLTAGE (V)
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
I
LOAD
= 375mA
MAX5957
MAX5957 toc07
12V AND 3.3V CURRENT-LIMIT THRESHOLD
VOLTAGE vs. TEMPERATURE
MAX5957 toc08
AUXILIARY CURRENT LIMIT
vs. TEMPERATURE
0.90
AUXILIARY CURRENT (mA)
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
MAX5957
MAX5958
MAX5957 toc09
0.20
I
LOAD
= 550mA
MAX5958
60
50
40
30
20
10
0
-40
-15
10
35
60
3.3V CURRENT-LIMIT
THRESHOLD
1.00
12V CURRENT-LIMIT
THRESHOLD
0
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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