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| 型号： | MAX5904ESA+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/24页 |
| 文件大小： | 633K |
| 描述： | IC HOT-SWAP CTRLR DUAL 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 热交换控制器 |
| 应用： | 通用型，PCI Express? |
| 内部开关： | 无 |
| 电源电压： | 1 V ~ 13.2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
slow-comparator threshold is beneficial when operating
with supply rails down to 1V because it allows a small
percentage of the overall output voltage to be used for
current sensing. The VariableSpeed/BiLevel fault pro-
tection feature offers inherent system immunity against
load transients and noise. This allows the slow-com-
parator threshold to be set close to the maximum nor-
mal operating level without experiencing nuisance
faults. Typically, set the overload current at 1.2 to 1.5
times the nominal load current. To adjust the slow-com-
parator threshold calculate R
LIM
as follows:
where V
TH
is the desired slow-comparator threshold
voltage.
Setting the Startup Period, R
TIM
The startup period (t
START
) of the MAX5904/MAX5905 is
fixed at 9ms, and adjustable from 0.4ms to 50ms for the
MAX5906MAX5909. The adjustable startup period of
the MAX5906MAX5909 systems can be customized for
MOSFET gate capacitance and board capacitance
(C
BOARD
). The startup period is adjusted with the resis-
tance connected from TIM to GND (R
TIM
). R
TIM
must be
between 4k& and 500k&. The MAX5906MAX5909 start-
up period has a default value of 9ms when TIM is left
floating. Calculate R
TIM
with the following equation:
where t
START
is the desired startup period.
There are two ways of completing the startup
sequence. Case A describes a startup sequence that
slowly turns on the MOSFETs by limiting the gate
charge. Case B uses the current-limiting feature and
turns on the MOSFETs as fast as possible while still
preventing a high inrush current. The output voltage
ramp-up time (t
ON
) is determined by the longer of the
two timings, case A and case B. Set the MAX5906
MAX5909 startup timer t
START
to be longer than t
ON
to
guarantee enough time for the output voltage to settle.
Case A: Slow Turn-On (Without Current Limit)
There are two ways to turn on the MOSFETs without
reaching the fast-comparator current limit:
If the board capacitance (C
BOARD
) is small, the
inrush current is low.
If the gate capacitance is high, the MOSFETs turn
on slowly.
In both cases, the turn-on time is determined only by the
charge required to enhance the MOSFET. The small
gate-charging current of 100礎 effectively limits the out-
put voltage dV/dt. Connecting an external capacitor
between GATE and GND extends turn-on time. The time
required to charge/discharge a MOSFET is as follows:
where:
C
GATE
is the external gate to ground capacitance
(Figure 4)
V
GATE
is the change in gate voltage
t
C
V
Q
I
GATE
GATE
GATE
GATE
=
?
+
R
t
pF
TIM
START
=
?/DIV>
128 800
R
V
mV
A
LIM
TH
=
25
0 25
. ?/DIV>
Low-Voltage, Dual Hot-Swap Controllers/Power
Sequencers
______________________________________________________________________________________ 17
COMPONENT
MANUFACTURER
PHONE
WEBSITE
Dale-Vishay
402-564-3131
www.vishay.com
Sense Resistors
IRC
704-264-8861
www.irctt.com
International Rectifier
310-233-3331
www.irf.com
Fairchild
888-522-5372
www.fairchildsemi.com
MOSFETs
Motorola
602-244-3576
www.mot-s s.com/ d
PART NUMBER MANUFACTURER
DESCRIPTION
IRF7413
11m&, 8 SO, 30V
IRF7401
22m&, 8 SO, 20V
IRL3502S
International
Rectifier
6m&, D2PAK, 20V
MMSF3300
20m&, 8 SO, 30V
MMSF5N02H
30m&, 8 SO, 20V
MTB60N05H
Motorola
14m&, D2PAK, 50V
FDS6670A
10m&, 8SO, 30V
NDS8426A
13.5m&, 8 SO, 20V
FDB8030L
Fairchild
4.5m&, D2PAK, 30V
Table 2. Recommended n-Channel
MOSFETs
Table 3. Component Manufacturers
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5904ESA+ | 功能描述:热插拔功率分布 13.2V 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 |
| MAX5904ESA+T | 功能描述:热插拔功率分布 13.2V 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 |
| MAX5904ESA-T | 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 |
| MAX5904USA | 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 |
| MAX5904USA+ | 功能描述:热插拔功率分布 13.2V 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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