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参数资料
| 型号： | MAX8533EUB+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/10页 |
| 文件大小： | 240K |
| 描述： | IC HOT-SWAP CNTRLR 12V 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 热交换控制器 |
| 应用： | 通用型 Infiniband? |
| 内部开关： | 无 |
| 电源电压： | 10 V ~ 14 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
undervoltage reset monitor at full load. The maximum
gate voltage (V
GS
) rating must be at least ?0V. Low
MOSFET gate capacitance is not necessary for the
inrush current limiting because it is achieved by limiting
the GATE dV/dt. However, higher gate capacitance
increases the turn-off time of the MOSFET under fault
conditions.
Current-Limit and Overload Protection
The MAX8533 features a dual overcurrent protection
circuit that turns off the MOSFET in overcurrent situa-
tions. When an overload event is sensed, the IC limits
the current to a level set by ISET. Continuous overload
for a period set by the user (t
CTIM
) latches off the
MOSFET. The severe overcurrent protection immediate-
ly shuts down the external MOSFET and latches it off.
R3 sets the current-limit threshold voltage. This voltage
is generated from an internal 20礎 source driven
through R3. Therefore:
V
ILIM
= R3 x 20礎
The current-sense signal is sensed across resistor R1.
With no load, the voltage at ISET is the input voltage
plus V
ILIM
. As the load current increases, the voltage
drop across R1 increases and reduces the voltage at
ISET. Once V
ISET
is lower than V
IN
, the overcurrent
comparator (Figure 1) is tripped and the MAX8533
enters current regulation mode. During current regula-
tion mode, the gate voltage of the MOSFET is
decreased to limit the current to the output. The maxi-
mum time period for the current regulation mode is set
by the external capacitor at CTIM (C3). This feature
allows transient currents that exceed the current limit to
pass without shutting down the circuit. The current regu-
lation time period is determined as:
t
IREG
= C3 x (1.8V/20礎)
If t
IREG
expires and the overcurrent condition still
exists, the MOSFET is latched off.
The severe overcurrent comparator (Figure 1) trips if
the drop across the current-sense resistor (R1) is
150mV higher than the current-limit threshold (V
IN
exceeds V
ISET
by 150mV). During a severe overcurrent
event, the gate of the external MOSFET is pulled down
with a 350mA current source and latched immediately.
Toggle EN, LPEN, or input power to clear the latched
fault condition.
Overvoltage Protection
The MAX8533 has an adjustable overvoltage protection
feature that latches the IC off in case of an overvoltage
event. An external resistor-divider (R4 and R5, Figure 2)
from OUT to RET with OVP connected to the center,
sets the overvoltage threshold. Use 4.99k& for R4. R5
is determined using the following equation:
R5 = 4.99 x 10
3
x ((V
OVT
/ V
OVP
) - 1)
V
OVT
is the desired overvoltage threshold and V
OVP
is
2V (typ). OVP latches off the MAX8533 if an overvoltage
condition exists for 1.5ms. Toggle EN, LPEN, or input
power to clear the latched fault condition.
Fault Reset
Overcurrent, severe overcurrent, and overvoltage con-
ditions result in the MAX8533 entering a latched fault
condition. Toggle LPEN, EN, or input power to reset the
latched fault condition and return to normal operation.
Power-Good Output (POK)
POK is an open-drain output used to enable the on-
board DC-to-DC converter. The POK output turns high
impedance when the output rail reaches 9.6V. POK
must be pulled up to the users logic level using a
pullup resistor.
Smallest, Most Reliable, 12V, Infiniband-
Compliant Hot-Swap Controller
8 _______________________________________________________________________________________
REF
DESIGNATOR
DESCRIPTION
MANUFACTURER
PART NO.
C1
470礔, 25V aluminum
electrolytic capacitor
Sanyo
25MV470HC
C2
0.1礔 ?0%, 25V X5R
ceramic capacitor
Taiyo Yuden
TMK107BJ104KA
C3
0.01礔 ?0% X7R
ceramic capacitor
Kemet
C0606C103M4RAC
C4
0.22礔 ?0%, 25V X5R
ceramic capacitor
TDK
C1608X5R1A224K
R1*
10m& ?%, 0.5W
current-sense resistor
Dale
LRF1206- 01- R010- F
R2
20& ?% resistor
Panasonic
R3
3.09k& ?% resistor Panasonic
R4
4.99k& ?% resistor Panasonic
R5
31.6k& ?% resistor Panasonic
N1
N-channel MOSFET,
30V, 6m&
Siliconix
Si4842DY
Table 2. External Component List for 50W
Output
*Use a 20m& ?/SPAN>1%, 0.25W current-sense resistor for 25W
applications.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8533EUB+ | 功能描述:热插拔功率分布 12V InfiniBand-Comp 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 |
| MAX8533EUB+T | 功能描述:热插拔功率分布 12V InfiniBand-Comp 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 |
| MAX8533EUB-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 |
| MAX8533EVKIT | 制造商:Maxim Integrated Products 功能描述:SMALLEST 12V INFINIBAND-COMPLIANT - Rail/Tube |
| MAX8535AEUA | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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