max5959lecst Maxim Integrated Products, Inc., max5959lecst Datasheet

max5959lecst

Manufacturer Part Number

max5959lecst

Description

Quad Pci Express, Hot-plug Controllers

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX5959LECST.pdf (25 pages)

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The MAX5959/MAX5960 quad hot-plug controllers are

designed for PCI Express

devices provide hot-plug control for the main 12V, 3.3V,

and 3.3V auxiliary supplies of four PCIe slots. The

MAX5959/MAX5960s’ logic inputs/outputs allow interfac-

ing directly with the system hot-plug management con-

troller 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 MAX5959/MAX5960 drive eight 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 MAX5959/MAX5960 keep all the

MOSFETs off until the supplies rise above their respective

undervoltage lockout (UVLO) thresholds. Upon a turn-on

command, the MAX5959/MAX5960 enhance the external

and internal MOSFETs slowly with a constant gate current

to limit the power-supply inrush current.

The MAX5959/MAX5960 actively limit the current to pro-

tect all outputs at all times and shut down if an overcur-

rent condition persists longer than the programmable

overcurrent timeout. After an overcurrent or overtempera-

ture fault condition, the MAX5959L/MAX5960L latch off

while the MAX5959A/MAX5960A automatically restart

after a restart time delay. The MAX5959/MAX5960 are

offered in latch-off or autorestart versions (see the

Selector Guide ).

The MAX5959/MAX5960 are available in an 80-pin TQFP

package and operate over the -40°C to +85°C tempera-

ture range.

19-0856; 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.

MAX5959AECS+

MAX5959LECS+

MAX5960AECS+

MAX5960LECS+

Servers

Desktop Mobile Server Platforms

Workstations

PART

________________________________________________________________ Maxim Integrated Products

Quad PCI Express, Hot-Plug Controllers

General Description

(PCIe) applications. These

LATCH OFF

Applications

√

AUTORESTART

♦ PCIe Compliant

♦ Hot Swap 12V, 3.3V, and 3.3V Auxiliary for 4

♦ Integrated Power MOSFETs for Auxiliary Supply

♦ Controls di/dt and dV/dt

♦ Active Current Limiting Protects Against

♦ Programmable Current-Limit Timeout

♦ PWRGD Signal Outputs with Programmable

♦ Latched FAULT Signal Output After Overcurrent

♦ Attention Switch Inputs/Outputs with 4ms

♦ Present-Detect Inputs

♦ Force-On Inputs Facilitate Testing/Debug

♦ Thermal Shutdown

♦ 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.

MAX5959AECS+

MAX5960AECS+

√

MAX5959LECS+

MAX5960LECS+

PCIe Slots

Rails

Overcurrent/Short-Circuit Conditions

Power-On Reset (POR) (160ms Default)

or Overtemperature Fault

Debounce

Expander

PART

GUARANTEED AUX CURRENT (mA)

-40°C to +85°C

TEMP RANGE

Ordering Information

Selector Guide

375

550

PIN-

PACKAGE

80 TQFP

Features

CODE

C80-1

PKG

Related parts for max5959lecst

max5959lecst Summary of contents

Page 1

Rev 0; 7/07 Quad PCI Express, Hot-Plug Controllers General Description The MAX5959/MAX5960 quad hot-plug controllers are ® designed for PCI Express (PCIe) applications. These devices provide hot-plug control for the main 12V, 3.3V, and 3.3V auxiliary supplies of four ...

Page 2

Quad 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

Quad 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 ...

Page 4

Page 5

Quad 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

Quad 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

Quad 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

Quad 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 (LATCH-OFF OPTION) ...

Page 9

Quad 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) MAX5959 ...

Page 10

Quad 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 MAX5959 toc35 10V/div 5V/div ...

Page 11

Quad 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

Quad PCI Express, Hot-Plug Controllers PIN NAME Slot C 3.3V Negative Current-Sense Input. Connect to the negative side of the sense resistor using the 23 3.3SC- Kelvin-sensing technique to ensure accurate current sensing. Slot C 3.3V Gate-Drive Output. Connect 3.3GC ...

Page 13

Quad PCI Express, Hot-Plug Controllers PIN NAME Slot D 12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to 43 12SD+ 12SD+ using the Kelvin-sensing technique to ensure accurate current sensing. Slot D 3.3V Gate-Drive Output. Connect ...

Page 14

Quad PCI Express, Hot-Plug Controllers PIN NAME Slot A 3.3V Gate-Drive Output. Connect 3.3GA to the gate of slot A’s 3.3V MOSFET. At power-up, V3.3GA is charged to 5.5V above the 3.3V supply by a constant current derived from V ...

Page 15

Quad 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 16

Quad PCI Express, Hot-Plug Controllers At power-up, the MAX5959/MAX5960 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 17

Quad 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 PGTH3.3 ON_,TH ...

Page 18

Quad 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 19

Quad 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, OUTPUT3, and OUTPUT4. OUT- PUT_ is debounced for 4ms. When INPUT_ goes from high ...

Page 20

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

Page 21

Quad 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, 12GD, 3.3GA, 3.3GB, 3.3GC, and 3.3GD. 12G_ is the gate drive for the 12V main ...

Page 22

Quad PCI Express, Hot-Plug Controllers Table 3. Component Manufacturers COMPONENT 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 slow ...

Page 23

Quad PCI Express, Hot-Plug Controllers PCI EXPRESS SLOT_ PRSNT1# +12V 12G_ GND PWRGD PWRGD_ 10kΩ 3.3VAUX 3.3VAUXO_ GND 3.3G_ +3.3V PRSNT2# ______________________________________________________________________________________ Typical Application Circuit ONE OF FOUR SLOTS SHOWN V 3.3VAUX R1 8mΩ 0.1μF 2.2μF 12S_+ 3.3VAUXIN 12VIN 12S_- ...

Page 24

Quad PCI Express, Hot-Plug Controllers TOP VIEW + 12SB- 1 12SB+ 2 AUXONB 3 ONB 4 INPUT1 5 OUTPUT1 6 INPUT2 7 OUTPUT2 8 N.C. 9 FOND 10 PRES-DETD 11 OND 12 AUXOND 13 GND 14 FONC 15 PRES-DETC 16 ...

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 PACKAGE OUTLINE, 80L TQFP, 12x12x1.0mm 21-0072 is a registered trademark of Maxim Integrated Products, Inc ...

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