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参数资料
| 型号： | MAX891LEUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC SW P-CH HS 8-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 高端 |
| 输入类型： | 非反相 |
| 输出数： | 1 |
| 导通状态电阻： | 120 毫欧 |
| 电流 - 输出 / 通道： | 500mA |
| 电流 - 峰值输出： | 750mA |
| 电源电压： | 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： | 带卷 (TR) |
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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