max5957letnt Maxim Integrated Products, Inc., max5957letnt Datasheet

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max5957letnt

Manufacturer Part Number
max5957letnt
Description
Triple Pci Express, Hot-plug Controllers
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX5957LETNT.pdf (25 pages)
The MAX5957/MAX5958 triple hot-plug controllers are
designed for PCI Express (PCIe)
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.
19-0884; Rev 0; 7/07
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.
MAX5957AETN+
MAX5958AETN+
MAX5957LETN+
MAX5958LETN+
Servers
Desktop Mobile Server Platforms
Workstations
Embedded Devices
PART
________________________________________________________________ Maxim Integrated Products
Triple PCI Express, Hot-Plug Controllers
General Description
LATCH OFF
®
Applications
applications. These
√
√
AUTORESTART
o PCIe Compliant
o Hot Swap 12V, 3.3V, and 3.3V Auxiliary for 3
o Integrated Power MOSFETs for Auxiliary Supply
o Controls di/dt and dV/dt
o Active Current Limiting Protects Against
o Programmable Current-Limit Timeout
o PWRGD Signal Outputs with Programmable
o Latched FAULT Signal Output After Overcurrent
o Attention Switch Inputs/Outputs with 4ms
o Present-Detect Inputs
o Force-On Inputs Facilitate Testing/Debug
o Thermal Shutdown
o Allow Control Through SMBus with an I/O
+ 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.
MAX5957AETN+
MAX5958AETN+
MAX5957LETN+
MAX5958LETN+
PCIe Slots
Rails
Overcurrent/Short-Circuit Conditions
Power-On Reset (POR) (160ms Default)
or Overtemperature Fault
Debounce
Expander
√
√
PART
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
GUARANTEED AUX CURRENT (mA)
Ordering Information
Selector Guide
PIN-
PACKAGE
56 Thin QFN
56 Thin QFN
56 Thin QFN
56 Thin QFN
375
375
550
550
Features
T5677-1
T5677-1
T5677-1
T5677-1
CODE
PKG
1

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max5957letnt Summary of contents

Page 1

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) devices provide hot-plug control for 12V, 3.3V, and 3.3V auxiliary supplies of three PCIe slots. The MAX5957/ ...

Page 2

Triple PCI Express, Hot-Plug Controllers ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) 12VIN......................................................................-0.3V to +14V 12G_ ..........................................................-0. 12S_+, 12S_-, 3.3G_ ..............................-0. 3.3VAUXIN, ON_, FAULT_, PWRGD_.......................-0.3V to +6V PGND ....................................................................-0.3V to +0.3V All ...

Page 3

Triple PCI Express, Hot-Plug Controllers ELECTRICAL CHARACTERISTICS (continued 12V, V 12VIN 12S_+ 12S_- 3.3S_+ TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND, T noted. Typical values ...

Page 4

Triple PCI Express, Hot-Plug Controllers ELECTRICAL CHARACTERISTICS (continued 12V, V 12VIN 12S_+ 12S_- 3.3S_+ TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND, T noted. Typical values ...

Page 5

Triple PCI Express, Hot-Plug Controllers ( 12V 12VIN 12S_+ 3.3S_+ 3.3S_- OUTPUT_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND. See the Typical Application Circuit .) 12V INPUT SUPPLY CURRENT vs. TEMPERATURE 1.10 ...

Page 6

Triple PCI Express, Hot-Plug Controllers ( 12V 12VIN 12S_+ 3.3S_+ 3.3S_- OUTPUT_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND. See the Typical Application Circuit .) 12V UNDERVOLTAGE LOCKOUT THRESHOLD vs. TEMPERATURE 10.20 ...

Page 7

Triple PCI Express, Hot-Plug Controllers ( 12V 12VIN 12S_+ 3.3S_+ 3.3S_- OUTPUT_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND. See the Typical Application Circuit .) FAULT CONDITION ON 3.3V MAIN OUTPUT (AUTORESTART ...

Page 8

Triple PCI Express, Hot-Plug Controllers ( 12V 12VIN 12S_+ 3.3S_+ 3.3S_- OUTPUT_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND. See the Typical Application Circuit .) FAULT CONDITION ON AUXILIARY OUTPUT (LATCHOFF OPTION) ...

Page 9

Triple PCI Express, Hot-Plug Controllers ( 12V 12VIN 12S_+ 3.3S_+ 3.3S_- OUTPUT_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND. See the Typical Application Circuit .) SHORT CIRCUIT ON 3.3AUXO_ AUXILIARY OUTPUT MAX5957 ...

Page 10

Triple PCI Express, Hot-Plug Controllers ( 12V 12VIN 12S_+ 3.3S_+ 3.3S_- OUTPUT_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND. See the Typical Application Circuit .) PRESENT-DETECT (ON/OFF) OPERATION 10V/div 5V/div 5V/div 5V/div ...

Page 11

Triple PCI Express, Hot-Plug Controllers PIN NAME Slot B 12V Negative Current-Sense Input. Connect 12SB- to the negative side of the current-sense 1 12SB- resistor using the Kelvin-sensing technique to ensure accurate current sensing. Slot B 12V Positive Current-Sense Input. ...

Page 12

Triple PCI Express, Hot-Plug Controllers PIN NAME 22 3.3AUXOC Slot C 3.3V Auxiliary Power-Supply Output 3.3V Auxiliary Supply Input. 3.3VAUXIN is the input to a charge pump that drives the internal MOSFETs connecting 3.3VAUXIN to 3.3AUXO_. V 23, 48, 49 ...

Page 13

Triple PCI Express, Hot-Plug Controllers PIN NAME Slot A 3.3V Positive Current-Sense Input. Connect the positive side of the current-sense resistor to 41 3.3SA+ 3.3SA+ using the Kelvin-sensing technique to ensure accurate current sensing. Slot A 3.3V Negative Current-Sense Input. ...

Page 14

Triple PCI Express, Hot-Plug Controllers R R TIM PORADJ PORADJ TIM t FAULT t POR OSCILLATOR BIAS, REFERENCES, AND UVLO CONTROL LOGIC MAIN-CHANNEL CONTROL LOGIC AUX-CHANNEL UVLO INPUT COMPARATOR AND CHIP CONTROL LOGIC ON_ AUXON_ Figure 1. Single-Channel Internal Block ...

Page 15

Triple PCI Express, Hot-Plug Controllers At power-up, the MAX5957/MAX5958 keep all the external MOSFETs off until all supplies rise above their respective UVLO thresholds. These devices keep the internal MOSFETs off only until the 3.3VAUXIN supply rises above its UVLO ...

Page 16

Triple PCI Express, Hot-Plug Controllers Table 2. Control Logic Truth Table ON_ AUXON_ Low Low High Low Low High High High * PRES-DET_ high-to-low transition has a 4ms delay (t V PGTH12 V V ON_,TH PGTH3.3 ...

Page 17

Triple PCI Express, Hot-Plug Controllers V 12ILIM,TH R SENSE t FAULT PWRGD_ IS PULLED UP TO 3.3VAUXO_. FAULT_ IS PULLED UP TO 3.3VAUXIN. A FAULT ON THE 3.3V OUTPUT OR 3.3VAUXO_ OUTPUT PRODUCES SIMILAR RESULTS. Figure 4. 12 Output Overcurrent/Short ...

Page 18

Triple PCI Express, Hot-Plug Controllers Debounced Logic Gate (INPUT_ and OUTPUT_) INPUT1, INPUT2, and INPUT3 accept inputs from mechanical switches. The corresponding outputs are OUTPUT1, OUTPUT2, and OUTPUT3. OUTPUT_ is debounced for 4ms. When INPUT_ goes from high to low, ...

Page 19

Triple PCI Express, Hot-Plug Controllers LATCH-OFF N OPTION? N FAULT Y STILL PRESENT? ON_ TOGGLED Y t ELAPSED? HIGH ≥ LOW ≥ HIGH FAULT N Y RESET FAULT_ 3.3VAUXIN IS OK, MAIN INPUTS ARE AUXON_ IS HIGH, OK, ON_ IS ...

Page 20

Triple PCI Express, Hot-Plug Controllers External MOSFET Gate Drivers (12G_ and 3.3G_) The gate drive for the external MOSFETs is provided at 12GA, 12GB, 12GC, 3.3GA, 3.3GB, and 3.3GC. 12G_ is the gate drive for the 12V main supply and ...

Page 21

Triple PCI Express, Hot-Plug Controllers Table 3. Component Manufacturers COMPONENT MANUFACTURER Vishay-Date Sense Resistor IRC Fairchild International Rectifier MOSFETs Motorola Vishay-Siliconix Additional External Gate Capacitance External capacitance can be added from the gate of the external MOSFETs to GND to ...

Page 22

Triple PCI Express, Hot-Plug Controllers PCI EXPRESS SLOT_ PRSNT1# +12V GND PWRGD 10kΩ 3.3VAUX +3.3V PRSNT2# 22 ______________________________________________________________________________________ ONE OF THREE SLOTS SHOWN V 3.3VAUX R1 8mΩ 0.1µF 12G_ 3.3VAUXIN 12S_- 12S_+ PWRGD_ MAX5957 MAX5958 3.3VAUXO_ GND 3.3G_ 3.3S_- 3.3S_+ ...

Page 23

Triple PCI Express, Hot-Plug Controllers TOP VIEW 3.3GA 43 FAULTA 44 PWRGDA 45 PGND 46 3.3AUXOA 47 3.3AUXIN 48 3.3AUXIN 49 3.3AUXOB 50 PWRGDB 51 FAULTB ...

Page 24

Triple PCI Express, Hot-Plug Controllers (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.) E E/2 D ______________________________________________________________________________________ DETAIL A e (ND- ...

Page 25

... 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 © 2007 Maxim Integrated Products Package Information (continued) PACKAGE OUTLINE 32, 44, 48, 56L THIN QFN, 7x7x0.8mm 21-0144 is a registered trademark of Maxim Integrated Products, Inc ...

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