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参数资料
| 型号： | MAX5954LETX+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/22页 |
| 文件大小： | 1027K |
| 描述： | IC PCI EXP/HOT-PLUG CTRLR 36TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用型，PCI Express? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 带卷 (TR) |
Detailed Description
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
single PCI Express slot. The MAX5954s logic
inputs/outputs allow interfacing directly with the system
hot-plug-management controller or through an SMBus
with an external I/O expander. An 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 0.3&
n-channel MOSFET. An internal charge pumps pro-
vides a gate drive for the 12V output while the gate
drive of the 3.3V output is driven by the 12V input sup-
ply. The 3.3V auxiliary output is completely indepen-
dent from the main outputs with its own charge pump.
At power-up, the MAX5954 keeps all of the external
MOSFETs off until all supplies rise above their respec-
tive UVLO thresholds. The device keeps the internal
MOSFET off only until the 3.3VAUXIN supply rises
above its UVLO threshold. Upon a turn-on command,
the MAX5954 enhances the external 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 persists for longer
than a programmable overcurrent timeout. Thermal-
protection circuitry also shuts down all outputs if the die
temperature exceeds +150癈. After an overcurrent or
overtemperature fault condition, the MAX5954L latches
off while the MAX5954A automatically restarts after a
restart time delay.
The power requirement for PCI Express connectors is
defined by the PCI Express card specification and
summarized in Table 1.
Startup
The main supply outputs can become active only after
all the following events have occurred:
" V
3.3VAUXIN
is above its UVLO threshold
" V
12VIN
and V
3.3S+
are both above their UVLO
threshold
" ON is driven high
" PRES-DET is low for more than 5ms
The auxiliary supply output is made available only after
the following events have occurred:
" V
3.3VAUXIN
is above its UVLO threshold
" AUXON is driven high
" PRES-DET is low for more than 5ms
The FON input overrides all other control signals and
turns on the PCI Express slot when driven low, as long
as the UVLO thresholds have been reached. Table 2
summarizes the logic conditions required for startup.
The auxiliary supply input powers the internal control
logic and analog references of the MAX5954, so the
main supplies cannot be enabled if V
3.3VAUXIN
is not
present.
When an output is enabled, a programmable startup
timer (t
SU
) begins to count the startup time duration.
The value of t
SU
is set to 2x the fault timeout period
Single PCI Express, Hot-Plug
Controller
______________________________________________________________________________________ 13
PIN
NAME
FUNCTION
25
T2
Test Input. Connect T2 to GND.
28
TIM
v r rr n Tim
Pr r mmin In . nn
r i r
w n
& n
k& fr m TIM
ND
to program t
FAULT
. Leave TIM floating for a default timeout of 11ms.
31
OUTPUT
Digital Output. 4ms debounced digital output of INPUT.
32
INPUT
Digital Logic Gate Input
33
12VIN
12V Supply Input. V
12VIN
drives the gate of the MOSFET connected to 3.3G. 12VIN powers an internal
charge pump that drives the gate of the MOSFET connected to 12G.
34
GND
Ground
35
PGND
Power Ground. Connect externally to GND.
36
PORADJ
Power-On-Reset Programming Input. Connect a resistor between 500& and 500k& from PORADJ to GND
to program the POR timing. Leave floating for a default value of 160ms.
Pin Description (continued)
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相关代理商/技术参数 |
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| MAX5954LEVCMAXQUSB | 功能描述:电源管理IC开发工具 MAX5954LMAXQUSB EVAL KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX5954LEVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit/Evaluation System for the MAX5954L/MAX5954A RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX5955AEEE | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5955AEEE+ | 功能描述:热插拔功率分布 Dual Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5955AEEE+T | 功能描述:热插拔功率分布 Dual Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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