参数资料
| 型号： | MAX5944ESE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC FW CURR LIMITER DUAL 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | FireWire? 应用程序 |
| FET 型： | N 沟道 |
| 输出数： | 2 |
| 内部开关： | 无 |
| 延迟时间 - 关闭： | 100ns |
| 电源电压： | 7.5 V ~ 37 V |
| 电流 - 电源： | 1.3mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 带卷 (TR) |
Dual FireWire Current Limiter and Low-Drop
ORing Switch Controller
V INA
ONQ1
ONB
ONA
I INA
I INB
30m ?
INB
SENSEB
MAX5944
INA
SENSEA
30m ?
GATE1B
GATE2B
GATE1A
GATE2A
Q1
Q2
V OUT
V INB
V INB > V INA
PORT 2
OUTB
GND
OUTA
PORT 1
R 1 = ? TURN ? ON ? 1 ? x R 2
Figure 5. MAX5944 Power Switch Over ORing Timing Diagram
Undervoltage Lockout
The MAX5944 dual-channel, independent current-limit
switches have independent ON/OFF control. Both
channels operate from 7.5V to 37V and have default
6.5V undervoltage lockout thresholds. The external
MOSFETs remain off as long as V IN_ < 6.5V and/or
V ON_ < V ON_REF . The UVLO thresholds are program-
mable by connecting a resistor-divider at ON_. When
V ON_ > 1.24V and V IN_ > 7.5V, GATE2_ enhances to
5.5V, with respect to OUT_ and the MAX5944 switch
goes into normal operation.
Program the switches’ individual turn-on threshold volt-
ages using the following formula:
? V ?
? 1 . 24 ?
where V TURN-ON is the desired turn-on voltage of
channel A and/or B. Choose an R2 value in the 1k ?
range to minimize error due to ON input bias current.
When operating the MAX5944, ON_ must remain above
its 1.24V threshold. If V ON_ falls below its 1.24V thresh-
Figure 6. MAX5944 Operating in Reverse-Current Mode
(Routing Power from Port 1 to Port 2)
old, the power-supply MOSFETs turn off immediately
(less than 1μs). This allows the power supply to discon-
nect in the event of a fault condition detected by the
system, such as shorting of the output to a different
power-supply voltage or a FireWire signal pin. If possi-
ble transient conditions exist at the main power-supply
line (IN_), place an RC filter at ON_ to reject transient
voltage dips to prevent unnecessary power-supply
interruptions.
The MAX5944 remain in low-current shutdown mode
when V ON_ is below the 0.4V threshold. Low-current
shutdown mode disables the channel resulting in less
than 10μA supply current.
Current-Fault Status Outputs (FAULT_)
FAULT_ are high-voltage, open-drain outputs that pull
low when a current-limit fault shutdown has occurred.
FAULT_ remain low until the next startup cycle.
Autoretry Fault Management
The MAX5944 autoretry feature attempts to restart after
a t OFF of 259ms, limiting the duty cycle of the MOSFETs
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5944EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX5944 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX5945CAX | 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 |
| MAX5945CAX+ | 功能描述:热插拔功率分布 IEEE 802.3af Quad Net Pwr 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 |
| MAX5945CAX+T | 功能描述:热插拔功率分布 IEEE 802.3af Quad Net Pwr 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 |
| MAX5945CAX-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 |
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