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| 型号： | MAX892LEUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC P-CHANNEL SWITCH 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 420 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 250mA |
| 输入电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
| 产品目录页面： | 1410 (CN2011-ZH PDF) |
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
______________________________________________________________Pin Description
PIN
1, 2
3
4
5
6
7, 8
NAME
IN
ON
GND
SET
FAULT
OUT
FUNCTION
Input. P-channel MOSFET source. Bypass IN with a 1μF capacitor to ground.
Active-Low Switch On Input. A logic low turns the switch on.
Ground
Set Current-Limit Input. A resistor from SET to ground sets the current limit for the switch. See Setting the
Current Limit section.
Fault-Indicator Output. This open-drain output goes low when in current limit or when the die temperature
exceeds +135°C.
Switch Output. P-channel MOSFET drain. Bypass OUT with a 0.1μF capacitor to ground.
_______________Detailed Description
The MAX891L/MAX892L P-channel MOSFET power
switches limit output current to a user-programmed
level. When the output current is increased beyond
the set current level, the current is also increased
through the replica switch (I OUT /965) and through
R SET (Figure 1). The current-limit error amplifier com-
pares the voltage across R SET to the internal 1.24V ref-
IN
FAULT
P
P
MAX891L
MAX892L
OUT
erence and regulates the current back to the lesser of
the programmed current limit (I LIMIT ) or the maximum
current limit (I MAX ).
N
REPLICA
AMPLIFIER
ON
These switches are not bidirectional; therefore, the
input voltage must be higher than the output voltage.
Setting the Current Limit
P
SET
The MAX891L/MAX892L feature internal current-limit-
ing circuitry with maximum programmable values
(I MAX ) of 500mA and 250mA, respectively. For best
performance, set the current limit (I LIMIT ) between
0.2I MAX ≤ I LIMIT ≤ I MAX . This current limit remains in
effect throughout the input supply-voltage range.
ON
HOT
CURRENT-LIMIT
AMPLIFIER
1.24V
R SET
Program the current limit with a resistor (R SET ) from
SET to ground (Figure 2) as follows:
ON
CONTROL
CIRCUITRY
GND
I SET = I LIMIT / I RATIO
R SET = 1.240 / I SET
where I LIMIT is the desired current limit, and I RATIO is
the I OUT to I SET current ratio (965).
Short-Circuit Protection
The MAX891L/MAX892L are short-circuit-protected
switches. In the event of an output short circuit or cur-
rent-overload condition, the current through the switch is
limited by the internal current-limiting error amplifier to
1.5 x I LIMIT . When the fault condition is removed, the
replica error amplifier sets the current limit back to
I LIMIT .
Figure 1. Functional Diagram
For a high ? V DS / ? t during an output short-circuit condi-
tion, the switch turns off and disconnects the input sup-
ply from the output. The current-limiting amplifier then
slowly turns the switch on with the output current limited
to 1.5 x I LIMIT . When the fault condition is removed, the
current limit is set back to I LIMIT . Refer to the Current-
Limit Response graphs in the Typical Operating
Characteristics.
6
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX892LEUA+ | 功能描述:电源开关 IC - 配电 Current-Limited High-Side PCh 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 |
| MAX892LEUA+T | 功能描述:电源开关 IC - 配电 Current-Limited High-Side PCh 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 |
| MAX892LEUA-T | 功能描述:电源开关 IC - 配电 Current-Limited High-Side PCh 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 |
| MAX8930EVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR MAX8930 - Boxed Product (Development Kits) |
| MAX8930EWJ+T | 功能描述:LED照明驱动器 WLED Charge Pump RGB Boost LDOs & ALC RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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