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参数资料
| 型号： | MAX5909EEE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 19/24页 |
| 文件大小： | 633K |
| 描述： | IC HOT-SWAP CTRLR DUAL 16QSOP |
| 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： | 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
OUTC is high impedance when V
INC+
is greater than
1.236V.
Using the MAX5904MAX5909 on the
Backplane
Using the MAX5904MAX5909 on the backplane allows
multiple cards with different input capacitance to be
inserted into the same slot even if the card does not
have on-board hot-swap protection. The startup period
can be triggered if IN is connected to ON through a
trace on the card (Figure 13).
Input Transients
The voltage at IN1 or IN2 must be above the UVLO dur-
ing inrush and fault conditions. When a short-circuit
condition occurs on the board, the fast comparator
trips causing the external MOSFET gates to be dis-
charged at 3mA. The main system power supply must
be able to sustain a temporary fault current, without
dropping below the UVLO threshold of 2.4V, until the
external MOSFET is completely off. If the main system
power supply collapses below UVLO, the
MAX5904MAX5909 will force the device to restart
once the supply has recovered. The MOSFET is turned
off in a very short time resulting in a high di/dt. The
backplane delivering the power to the external card
must have low inductance to minimize voltage tran-
sients caused by this high di/dt.
MOSFET Thermal Considerations
During normal operation, the external MOSFETs dissi-
pate little power. The MOSFET R
DS(ON)
is low when the
MOSFET is fully enhanced. The power dissipated in
normal operation is P
D
= I
LOAD
2
x R
DS(ON)
. The most
power dissipation occurs during the turn-on and turn-
off transients when the MOSFETs are in their linear
regions. Take into consideration the worst-case sce-
nario of a continuous short-circuit fault, consider these
two cases:
1) The single turn-on with the device latched after a
fault (MAX5905/MAX5907/MAX5909)
2) The continuous automatic retry after a fault
(MAX5904/MAX5906/MAX5908)
MOSFET manufacturers typically include the package
thermal resistance from junction to ambient (R
窲A
) and
thermal resistance from junction to case (R
窲C
) which
determine the startup time and the retry duty cycle (d =
t
START
/ t
RETRY
). Calculate the required transient ther-
mal resistance with the following equation:
where I
START
= V
SU,TH
/ R
SENSE
Layout Considerations
To take full tracking advantage of the switch response
time to an output fault condition, it is important to keep
all traces as short as possible and to maximize the
high-current trace dimensions to reduce the effect of
undesirable parasitic inductance. Place the MAX5904
Z
T
T
V I
JA MAX
JMAX A
IN START
?nbsp (
)
d
?/DIV>
Low-Voltage, Dual Hot-Swap Controllers/Power
Sequencers
______________________________________________________________________________________ 19
SENSE VOLTAGE (V
IN
- V
SENSE
)
V
SC,TH
V
FC,TH
(4 x V
SC,TH
)
3ms
110祍
260ns
SLOW
COMPARATOR
FAST
COMPARATOR
Figure 9. VariableSpeed/BiLevel Response
GATE
SENSE
GND
R
SENSE
V
OUT
C
GATE
C
BOARD
V
IN
IN
R
PULLUP
PGOOD
*OPTIONAL COMPONENTS (SEE THE ON COMPARATOR SECTION).
MAX5906
MAX5907
MAX5908
MAX5909
ON
*
*
Figure 10. Operating with an External Gate Capacitor
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5909UEE | 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 |
| MAX5909UEE+ | 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 |
| MAX5909UEE+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 |
| MAX5909UEE-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 |
| MAX5910ESA | 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 |
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