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参数资料
| 型号： | MAX5943AEEE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/20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
Timing accuracy is guaranteed for R TIM ranging from
4k Ω to 50k Ω . Large R TIM values can be used, which
reduces timing accuracy. A maximum timeout period is
enforced to prevent arbitrarily long operation in current-
limit/circuit-breaker conditions.
Long durations in current-limit/circuit-breaker mode
V INA
I INA = 0
FROM
BATTERY
SOURCE
ON IN
R SENSE
SENSE GATE1
GATE2
OUT
TO FireWire
PORT
V INB > V INA
I LOAD
may produce excessive heating and electrical stresses
in R SENSE , Q1, Q2, and any other components in the
power path. Use component values rated to handle
GND
MAX5943
OR_ADJ
ONQ1
electrical stresses during the timeout period.
Power-Supply ORing (ONQ1 = Low)
GATE1 controls the MAX5943 ORing function. The
MAX5943 accomplishes a very-low-voltage-drop diode
ORing function using an n-channel power MOSFET, Q1.
V INB
I INB
FROM
POWER
SOURCE
R SENSE
Initially, GATE1 is off (ONQ1 = low) and the load current
conducts through the body diode of Q1 (Figure 4).
GATE1 rises to 5.5V above SENSE when V IS exceeds
V OR , enhancing Q1. Q1’s low R DS(ON) provides a very-
ON IN
SENSE GATE1
MAX5943
GND
OR_ADJ
ONQ1
GATE2
OUT
low-voltage drop across its source to drain, reducing volt-
age drop, power dissipation, and heat generation in the
power-supply path created by a traditional diode.
The MAX5943 continuously monitors the load current
by the voltage drop, V IS , across the current-sensing
resistor. Q1 turns off rapidly when V IS decreases below
V OR minus its hysteresis.
Set the MAX5943 ORing threshold (V OR ) by connecting
OR_ADJ to GND for a 5mV threshold, or to IN for a
10mV threshold, or leave it open for a 7.5mV threshold.
Connect ONQ1 to GND for normal ORing function.
Drive ONQ1 high to force Q1 on, regardless of the load
current condition, as long as the voltages at IN and ON
exceed V UVLO and V ON_REF , respectively, and the
device is not in a current fault shutdown.
When a higher voltage supply is connected at OUT
(Figure 5), the sense voltage drops below the program-
mable ORing threshold. The MAX5943 immediately
turns off Q1, blocking reverse current flow from OUT to
IN. The power is then routed from the higher supply
input to the load (Figure 6).
Figure 5. MAX5943 ORing Controller Rerouting Load Current
V INA
I INA
I INB
V IN
+
V IS
R SENSE
-
TO FireWire
PORT
V OUT
Q1
Q2
ON IN
SENSE
GATE1
GATE2
OUT
MAX5943
V INB
GND
OR_ADJ
ONQ1
V INB > V INA
Figure 4. Q1 Current Path During Inital Startup
Figure 6. MAX5943 Power Switch Over ORing 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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