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参数资料
| 型号： | MAX5943AEEE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC FIREWIRE CURR LIMITER 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 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-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
FireWire Current Limiter and Low-Drop
ORing Switch Controller
The MAX5943 current-limit/circuit-breaker timeout is
programmable by connecting an external resistor from
TIM to GND. The MAX5943A has a default 2ms current-
limit timeout. The MAX5943B, MAX5943C, MAX5943D,
and MAX5943E have 0.5ms, 1ms, 2ms, and 4ms
V FAULT
default circuit-breaker timeouts, respectively.
GATE1 controls the MAX5943 ORing function. Initially,
GATE1 is off (ONQ1 = low) and the load current con-
ducts through the body diode of Q1. GATE1 rises to
5.5V above SENSE when V IS exceeds V OR , thereby
enhancing Q1 and reducing the voltage drop, power
dissipation, and heat generation in the power-supply
path. When a voltage greater than V IN is connected at
OUT, the higher voltage source commences, providing
current to the load. The MAX5943 rapidly turns off
GATE1 upon V IS falling below V OR - hysteresis, thus
blocking the higher voltage from back-driving V IN .
GATE1 also turns off when the load current drops,
causing V IS to fall below the V OR hysteresis.
I OUT
V GATE1
V GATE2
t ILIM
I LIMIT
V IN
Current Limiting/Circuit Breaker
Current Limiting (MAX5943A Only)
The MAX5943A limits the load current by monitoring the
voltage across R SENSE at all times and by regulating the
current to the load as necessary to keep V IS to its pro-
grammable current-limit threshold voltage (V TH ). Set the
maximum current limit (I LIMIT ) by placing the appropriate
sense resistor between IN and SENSE, where I LIMIT =
V TH /R SENSE . When the load current is less than I LIMIT ,
V OUT
V FAULT
I LIMIT x R LOAD
(a)
GATE2 rises to V G2 (5.5V) to fully enhance MOSFET Q2
(see the Typical Operating Circuit).
When the load current attempts to draw more than
I LIMIT , the MAX5943A’s GATE2 pulldown current (I G2D )
regulates the current through Q2 causing OUT to act as
a constant-current source. The output current is limited
to the programmed I LIMIT . If the current-limit condition
persists after the current-limit timeout (t ILIM ) period has
expired, GATE2’s strong pulldown current (I G2 OFF )
quickly turns off GATE2 to disconnect the load from the
power supply. FAULT then asserts low (Figure 2a). If the
current-limit duration is less than t ILIM , GATE2 pulls to
V G2 (Figure 2b). During an output short circuit or a
gross overload, the load current overshoots and causes
I OUT
V GATE1
V GATE2
< t ILIM
I LIMIT
V IS to exceed the fast pulldown current-limit threshold
voltage (V THF ). The MAX5943A responds with much
stronger GATE2 pulldown currents (I G2DP and/or I G2DF )
V OUT
I LIMIT x R LOAD
to quickly bring the load current back down to the pro-
grammed current limit.
(b)
Figure 2. MAX5943A Current-Limit Timing Diagram
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5943AEEE+ | 功能描述:热插拔功率分布 FireWire Current Limiter 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 |
| MAX5943AEEE+T | 功能描述:热插拔功率分布 FireWire Current Limiter 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 |
| MAX5943AEEE-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 |
| MAX5943AEVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX5943A/B/C/D/E 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 |
| MAX5943BEEE | 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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