MAX5959 Datasheet, PDF (1/1 Pages) Maxim Integrated Products – Quad PCI Express, Hot-Plug Controllers

19-XXXX; Rev 0; 7/07
Quad PCI Express, Hot-Plug Controllers
General Description
Features
The MAX5959/MAX5960 quad hot-plug controllers are _{o PCIe Compliant}
designed for PCI Express^® (PCIe) applications. These
devices provide hot-plug control for the main 12V, 3.3V, ^{o Hot Swap 12V, 3.3V, and 3.3V Auxiliary for 4}
and 3.3V auxiliary supplies of four PCIe slots. The
MAX5959/MAX5960’s 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
Y _{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
R _{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
A _{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 of the
N _{MOSFETs off until the supplies rise above their respective}
undervoltage lockout (UVLO) thresholds. Upon a turn-on
I _{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 shutdown if an overcurrent
M _{condition persists longer than the programmable overcur-}
rent timeout. After an overcurrent or overtemperature fault
I _{condition, the MAX5959L/MAX5960L latch off while the}
MAX5959A/MAX5960A automatically restart after a restart
time delay. The MAX5959/MAX5960 are offered in latch-
L _{off or auto-restart 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-
E ture range.
Applications
Servers
R _{Desktop Mobile Server Platforms}
P^Workstations
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
Ordering Information
PART
TEMP RANGE
MAX5959AECS+ -40°C to +85°C
MAX5959LECS+ -40°C to +85°C
MAX5960AECS+ -40°C to +85°C
MAX5960LECS+ -40°C to +85°C
+Denotes lead-free package.
PIN-
PACKAGE
80 TQFP
80 TQFP
80 TQFP
80 TQFP
PKG
CODE
C80-1
C80-1
C80-1
C80-1
Pin Configuration and Typical Application Circuit appear at
end of data sheet.
Selector Guide
PART
LATCH OFF
AUTO RESTART
GUARANTEED AUX CURRENT (mA)
MAX5959AECS+
√
375
MAX5959LECS+
√
375
MAX5960AECS+
√
550
MAX5960LECS+
√
550
PCI-Express is a registered trademark of PCI-SIG Corp. SMBus is a trademark of Intel Corp.
________________________________________________________________ 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.