MAX5954 Maxim Integrated Products, MAX5954 Datasheet
MAX5954
Manufacturer Part Number
MAX5954
Description
Hot-Plug Controller
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX5954.pdf
(22 pages)
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MAX5954AETX+
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The MAX5954 hot-plug controller is designed for PCI
Express™ applications. The device provides hot-plug
control for 12V, 3.3V, and 3.3V auxiliary supplies of a sin-
gle PCI Express (PCI-E) slot. The MAX5954’s logic
inputs/outputs allow interfacing directly with the system
hot-plug management controller or through an SMBus™
with an external I/O expander. Integrated debounced
attention switch and present-detect signals are included
to simplify system design.
The MAX5954 drives two external n-channel MOSFETs
to control the 12V and 3.3V main outputs. The 3.3V aux-
iliary output is controlled through an internal 0.3Ω
n-channel MOSFET. An internal charge pump provides
gate drive for the 12V output while the gate drive of the
3.3V output is driven by the 12V input supply. The 3.3V
auxiliary output is completely independent from the
main outputs with its own charge pump.
At power-up, the MAX5954 keeps all of the external
MOSFETs off until the supplies rise above their respec-
tive undervoltage-lockout (UVLO) thresholds. The
device keeps the internal MOSFET off only until the aux-
iliary input supply rises above its UVLO threshold. Upon
a turn-on command, the MAX5954 enhances the exter-
nal and internal MOSFETs slowly with a constant gate
current to limit the power-supply inrush current. The
MAX5954 actively limits the current of all outputs at all
times and shuts down if an overcurrent condition per-
sists for longer than a programmable overcurrent time-
out. Thermal-protection circuitry also shuts down all
outputs if the die temperature exceeds +150°C. After an
overcurrent or overtemperature fault condition, the
MAX5954L latches off while the MAX5954A automatical-
ly restarts after a restart time delay. The device is avail-
able in a 36-pin (6mm × 6mm) thin QFN package and
operates over the -40°C to +85°C temperature range.
19-3914; Rev 1; 1/06
Typical Application Circuit appears at end of data sheet.
SMBus is a trademark of Intel Corp.
PCI Express is a trademark of PCI-SIG Corp.
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.
Servers
Desktop Mobile Server Platforms
Workstations
Embedded Devices
________________________________________________________________ Maxim Integrated Products
General Description
Applications
Single PCI Express, Hot-Plug
♦ PCI Express Compliant
♦ Hot Swaps 12V, 3.3V, and 3.3V Auxiliary for a
♦ Integrated Power MOSFET for Auxiliary Supply
♦ Controls dI/dt and dV/dt
♦ Active Current Limiting Protects Against
♦ Programmable Current-Limit Timeout
♦ PWRGD Signal Output with Programmable
♦ Latched FAULT Signal Output after Overcurrent
♦ Attention Switch Input/Output with 4.4ms
♦ Present-Detect Input
♦ Forced-On Input Facilitates Testing
♦ Thermal Shutdown
♦ Allows Control through SMBus with an I/O
+Denotes lead free package.
MAX5954AETX+ -40°C to +85°C
MAX5954LETX+ -40°C to +85°C
Single PCI-E Slot
Rail
Overcurrent/Short-Circuit Conditions
Power-On Reset (POR) (160ms Default)
or Overtemperature Fault
Debounce
Expander
PART
OUTPUT
PORADJ
TOP VIEW
INPUT
12VIN
PGND
GND
N.C.
N.C.
TIM
28
29
30
31
32
33
34
35
36
+
27 26 25 24 23 22 21 20 19
1
TEMP RANGE
2
3
Ordering Information
THIN QFN
MAX5954
4
5
Pin Configuration
6
7
Controller
8
36 Thin QFN
36 Thin QFN
PIN-
PACKAGE
9
18
17
16
15
14
13
12
11
10
Features
N.C.
N.C.
N.C.
3.3VAUXIN
3.3VAUXO
PWRGD
FAULT
3.3G
N.C.
T3666-3
T3666-3
CODE
PKG
1
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