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| 型号： | MAX890LESA/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC SW MOSFET PUR PCH HSIDE 8SOIC |
| 标准包装： | 100 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 130 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 1.2A |
| 输入电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Pin Description
PIN
1, 2
3
4
5
6, 7
8
NAME
IN
ON
GND
SET
OUT
FAULT
FUNCTION
Input. P-channel MOSFET source. Bypass IN with a 1 μ F 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.
R SET = 1.38 x 10 3 /I LIMIT, where I LIMIT is the desired current limit in amperes.
Switch Output. P-channel MOSFET drain. Bypass OUT with a 0.1 μ F capacitor to ground.
Fault-Indicator Output. This open-drain output goes low when in current limit or when the die temperature
exceeds +135°C.
Detailed Description
The MAX890L P-channel MOSFET power switch limits
output current to a programmed level. When the output
IN
P
OUT
current is increased beyond the programmed current
limit, or 1.2A (I MAX ), the current also increases through
the replica switch (I OUT /1110) and through R SET
FAULT
P
MAX890L
(Figure 1). The current-limit error amplifier compares
the voltage across R SET to the internal +1.24V refer-
N
REPLICA
ence and regulates the current back to the lesser of the
programmed limit (I LIMIT ) or 1.2A.
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
AMPLIFIER
ON
P
Setting the Current Limit
The MAX890L features internal current-limiting circuitry
with a maximum programmable value (I MAX ) of 1.2A.
For best performance, set the current limit (I LIMIT )
between 0.2 I MAX ≤ I LIMIT ≤ I MAX . This current limit
ON
CURRENT-LIMIT
AMPLIFIER
1.24V
SET
R SET
remains in effect throughout the input supply-voltage
HOT
range.
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 / 1110
R SET = 1.24V / I 8 = 1.38 x 10 3 / I LIMIT
where I LIMIT is the desired current limit.
Short-Circuit Protection
The MAX890L is a short-circuit-protected switch. In the
event of an output short circuit or current-overload con-
dition, 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 dV DS /dt during an output short-circuit condi-
tion, the switch turns off and disconnects the input supply
from the output. The current-limiting amplifier then slow-
ly 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 Output
Short-Circuit Fast-Loop Response and Output Overload
Slow-Loop Response in the Typical Operating
Characteristics.
6
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