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| 型号： | MAX4788EXS+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC ANALOG SWITCH 1X1 SC70-4 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 功能： | 开关 |
| 电路： | 1 x 1:1 |
| 导通状态电阻： | 1 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 2.3 V ~ 5.5 V |
| 电流 - 电源： | 65µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-82A，SOT-343 |
| 供应商设备封装： | SC-70-4 |
| 包装： | 标准包装 |
| 产品目录页面： | 1421 (CN2011-ZH PDF) |
| 其它名称： | MAX4788EXS+TDKR |
MAX4785–MAX4788
Detailed Description
The MAX4785–MAX4788 are forward/reverse current-
limited switches that operate from a 2.3V to 5.5V input
voltage range and guarantee a 50mA and 100mA mini-
mum current-limit threshold for different options. The
voltage drop across an internal sense resistor is com-
pared to two reference voltages to indicate a forward or
reverse current-limit fault. When the load current
exceeds the preset current limit for greater than the
fault-blanking time, the switch opens.
The MAX4786 and MAX4788 have an autoretry function
that turns on the switch again after an internal retry time
expires. If the faulty load condition is still present after
the blanking time, the switch turns off again and the
cycle is repeated. If the faulty load condition is not pre-
sent, the switch remains on.
The MAX4785 and MAX4787 do not have the autoretry
option and the switch remains in latch-off mode until
the ON pin or the input power is cycled from high to low
and then high again.
The undervoltage lockout (UVLO) circuit prevents erro-
neous switch operation when the input voltage goes too
low during startup conditions.
Reverse-Current Protection
The MAX4785–MAX4788 limit the reverse current (VOUT
to VIN) from exceeding the maximum IREV value. The
switch is shut off and FLAG is asserted (MAX4785/
MAX4787) if the reverse current-limit condition persists
for more than the blanking time. This feature prevents
excessive reverse currents from flowing through the
device.
Switch-On/Off Control
Toggle ON high to enable the current-limited switches.
The switches are continuously on, only if VIN exceeds
the UVLO threshold (typically 2V) and there is no fault.
When a forward/reverse current fault is preset or the die
exceeds the thermal-shutdown temperature of +150°C,
OUT is internally disconnected from IN and the supply
current decreases to 8A (latch off). The switch is now
operating in one of its off states. The switch off-state
also occurs when driving ON low, thus reducing the
supply current (shutdown) to 0.01A. Table 1 illustrates
the ON/OFF state of the MAX4785–MAX4788 current-
limit switches.
50mA/100mA Current-Limit Switches
6
_______________________________________________________________________________________
N
BLANKING TIME
CIRCUITRY
REVERSE-CURRENT
DETECTOR
FORWARD CURRENT
DETECTOR
N
+2.0V
FLAG
OUT
IN
ON
GND
MAX4785/MAX4787
ONLY
LOGIC
AUTO-
RETRY
MAX4785–MAX4788
UNDERVOLTAGE
LOCKOUT
Figure 1. MAX4785–MAX4788 Functional Diagram
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相关代理商/技术参数 |
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| MAX4789ETT | 制造商:Maxim Integrated Products 功能描述:200MA/250MA/300MA CURRENT-LIMIT SWITCHES - Rail/Tube |
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| MAX4789ETT+T | 功能描述:电源开关 IC - 配电 200/250/300mA Crnt Limit Switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX4789ETT-T | 功能描述:电源开关 IC - 配电 RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX4789EUK | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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