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参数资料
| 型号： | MAX5943AEEE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/20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
Reverse Current Override (ONQ1 = High)
Drive ONQ1 high to disable the power-supply ORing
function. Disabling the MAX5943 ORing function allows
reverse current flow through the power-supply system.
V IN
IN
When ONQ1 is high, GATE1 remains fully enhanced as
long as V IN is greater than V UVLO , V ON is above the
V ON_REF threshold, and the MAX5943 is not in a cur-
rent-limit or circuit-breaker fault condition. The MAX5943
R1
R2
ON
MAX5943
reverse-current flow feature permits a higher voltage
source connected to one port to route power to another
port, as long as the voltage at IN remains above the
minimum 7.5V operating range (see Figure 7).
PORT1
GND
Figure 8. Setting the MAX5943 Turn-On Voltage
When operating the MAX5943, ON must remain above
its 1.24V threshold. If V ON falls below its 1.24V thresh-
old, the power-supply MOSFETs (Q1 and Q2) turn off
immediately (less than 1μs). This allows the power sup-
TIM IN
ON
ONQ1
SENSE GATE1
MAX5943
GATE2 OUT
FAULT
ply to disconnect 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
ILIM
LATCH
GND
OR_ADJ
pin. If possible transient conditions exist at the main
power-supply line (IN), place an RC filter at ON to
reject transient voltage dips and to prevent unneces-
PORT2
sary power-supply interruptions.
The MAX5943 remains in low-current shutdown mode
TIM IN
ON
ONQ1
ILIM
SENSE GATE1
MAX5943
LATCH GND
GATE2 OUT
FAULT
OR_ADJ
when V ON is below the 0.4V threshold. Low-current
shutdown mode disables the MAX5943 resulting in less
than 10μA supply current. Shutdown places all logic
inputs in a high-impedance state allowing the inputs to
be connected to IN without drawing additional current
from the supply. An internal delay, t SD , allows Q1 and
Q2 to be turned off before the MAX5943 enters low-
current shutdown mode.
Figure 7. MAX5943 Operating in Reverse-Current Mode
(Routing Power from Port 1 to Port 2)
Undervoltage Lockout
The MAX5943 operates from 7.5V to 37V and has a
default 6.5V undervoltage lockout threshold. The external
MOSFETs remain off as long as V IN > 6.5V and V ON <
V ON_REF . The turn-on threshold is programmable by
connecting a resistor-divider at ON. When V ON > 1.24V
and V IN > 7.5V, GATE2 is enhanced to 5.5V, with respect
to OUT and the MAX5943 goes into normal operation.
Fault Status Output (FAULT)
FAULT is a high-voltage open-drain output that pulls low
when a current-limit/circuit-breaker fault shutdown has
occurred. FAULT remains low until the next startup cycle.
V IN
IN
LATCH
R 1 = ?
? 1 ? × R 2
Program the MAX5943’s turn-on voltage using the fol-
lowing formula:
? V TURN _ ON
?
? 1 . 24
?
R1
R2
ON
MAX5943
GND
where V TURN_ON is the desired turn-on voltage of the
MAX5943. Choose an R2 value in the 1k Ω range to
minimize error due to the ON bias current.
Figure 9. Resetting MAX5943 After a Latched Fault Condition
14
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相关代理商/技术参数 |
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|---|---|
| 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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