参数资料
| 型号： | MAX893LESA+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-SOIC |
| 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： | 70 毫欧 |
| 电流 - 输出 / 通道： | 1.2A |
| 电流 - 峰值输出： | 1.8A |
| 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-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
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 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.
R SET = 1.34 · 10 3 / I LIMIT, where I LIMIT is the desired current limit in amperes.
Switch Output. P-channel MOSFET drain. Bypass OUT with a 0.1μF capacitor to ground.
Fault-Indicator Output. This open-drain output goes low when in current limit or when the die temperature
exceeds +165°C.
Detailed Description
The MAX893L 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 / 1080) and through R SET
FAULT
P
MAX893L
(Figure 1). The current-limit error amplifier compares
the voltage across R SET to the internal 1.24V reference,
and regulates the current to the programmed current
limit (I LIMIT ).
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
Setting the Current Limit
N
REPLICA
AMPLIFIER
ON
P
SET
The MAX893L features internal current-limiting circuitry
ON
CURRENT-LIMIT
with a maximum programmable value (I MAX ) of 1.2A.
For best performance, set the current limit (I LIMIT )
between 0.2A ≤ I LIMIT ≤ 1.2A. This current limit remains
in effect throughout the input supply-voltage range.
HOT
AMPLIFIER
1.24V
R SET
Program the current limit with a resistor (R SET ) from
SET to ground (Figure 2) as follows:
I SET = I LIMIT / 1080
ON
CONTROL
CIRCUITRY
GND
R SET = 1.24V / I SET = 1.34 · 10 3 / I LIMIT
where I LIMIT is the desired current limit.
Short-Circuit Protection
The MAX893L is a short-circuit protected switch. In the
event of an output short circuit or a current overload
condition, the current through the switch is limited by
the internal current-limiting error amplifier to 1.5 · I LIMIT .
The short-circuit current is typically 1.8A for a pro-
grammed current limit of 1.2A. When the short-circuit
condition is removed, the replica error amplifier will set
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 supply
from the output. The current-limiting amplifier then slow-
ly turns the switch on with the output current limited to
1.5 · I LIMIT . When the short-circuit condition is removed,
the current limit is set back to I LIMIT . See Output Short-
Circuit (Fast-Loop Response) and Output Overload
(Slow-Loop Response) in the Typical Operating
Characteristics.
6
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