参数资料
| 型号： | MAX5943BEEE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/20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
MAX5943B–MAX5943E Circuit Breaker
The MAX5943B–MAX5943E provide a circuit-breaker
function that protects against excessive load currents
and short-circuit conditions. The load current is monitored
by sensing the voltage across an external sense resistor
(R SENSE ) and disconnects the load from the power
source when the voltage across R SENSE , V IS , exceeds
the programmed circuit-breaker thresholds (V TH ) for
longer than the circuit-breaker timeout period, t CB .
Current-Limit/Circuit-Breaker Thresholds
The MAX5943 allows three selectable current-limit/cir-
cuit-breaker thresholds (V TH ). Choose the voltage
threshold by connecting ILIM to the appropriate level;
see Table 1.
Table 1. Current-Limit/Circuit-Breaker
Trip Threshold Level
Unlike the MAX5943A, when an output short circuit or
overcurrent occurs, the MAX5943B–MAX5943E keep
GATE2 fully enhanced. The short-circuit current is limit-
ed only by the input source impedance, R SENSE , Q1’s
R DS(ON), Q2’s R DS(ON) , and any parasitic impedance in
the power path. If the excessive current condition per-
ILIM CONNECTION
Open
GND
IN
V TH (mV)
40
50
60
sists (as indicated by V IS > V TH ) for longer than t CB ,
GATE2 turns off with a strong pulldown (I G2 OFF ) to
quickly disconnect the power source from the load and
FAULT asserts low (Figure 3).
Exercise caution when using the MAX5943B–MAX5943E.
Unlike the MAX5943A, the MAX5943B–MAX5943E do not
limit the load current during t CB . High current during t CB
may cause damage to external devices connected in the
power path.
Current-Limit/Circuit-Breaker
Timeout Period (t ILIM /t CB )
The MAX5943 ’s current-limit/circuit-breaker timeout
function disconnects power from the load if the current-
limit or circuit-breaker threshold voltage exceeds its
maximum limit for a programmable amount of time.
Connect TIM to IN for the MAX5943 default timeout
periods (see Table 2).
Adjust the fault timeout period (t ILIM/ t CB ) by connect-
ing a resistor (R TIM ) from TIM to GND (see the Typical
Operating Characteristics ). Calculate the fault-limit
timeout period using the following equation:
t ILIM ( ms ) = t CB ( ms ) = 0 . 25 ×
R TIM (k Ω )
K
where R TIM is in k Ω , t ILIM /t CB is in ms, and K = 1 for
V FAULT
t CB
I LIMIT
MAX5943A, K = 32 for MAX5943B, K = 16 for
MAX5943C, K = 8 for MAX5943D, and K = 4 for the
MAX5943E.
Table 2. MAX5943_ Timeout Periods
I OUT
V GATE1
V GATE2
V OUT
V G2
V G2
V IN
PART
MAX5943A
MAX5943B
MAX5943C
MAX5943D
MAX5943E
DEFAULT
TIMEOUT,
TIM = IN
(ms)
2
0.5
1
2
4
PROGRAMMABLE
TIMEOUT RANGE
(4k Ω < R TIM < 50k Ω )
1.04ms to 11.05ms
32.5μs to 345μs
65μs to 690μs
130μs to 1.38ms
260μs to 2.76ms
MAXIMUM
TIMEOUT,
TIM =
FLOATING
(ms)
175
4.8
9.6
19.2
38.4
Figure 3. MAX5943B–MAX5943E Circuit-Breaker Timing Diagram
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5943BEEE+ | 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 |
| MAX5943BEEE+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 |
| MAX5943BEEE-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 |
| MAX5943CEEE | 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 |
| MAX5943CEEE+ | 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 |
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