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參數(shù)資料
| 型號(hào)： | MAX895L |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| 中文描述： | 雙路、限流型、高邊P溝道開關(guān)，帶有熱關(guān)斷 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 90K |
| 代理商： | MAX895L |
_______________Detailed Desc ription
The MAX869L P-channel MOSFET power switch limits
output current to a programmed level. When the output
current passes through the main switch, a smaller cur-
rent also passes through the replica switch (I
OUT
/ 955)
and through R
SET
(Figure 1). When the voltage on R
SET
exceeds the trip voltage of 1.24V, the current-limit error
amplifier regulates the output current to the pro-
grammed current limit, I
LIMIT
(400mA to 2.4A).
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
S etting the Current Limit
The MAX869L features internal current-limiting circuitry
with a maximum programmable value (I
MAX
) of 2.4A.
For best performance, set the current limit (I
LIMIT
)
between 0.2 I
MAX
≤
I
LIMIT
≤
I
MAX
. This current limit
remains in effect throughout the input supply-voltage
range.
Program the current limit with a resistor (R
SET
) from
SET to ground (Figure 2) as follows:
I
SET
= I
LIMIT
/ 955
R
SET
= 1.24V / I
SET
= 1,184 /I
LIMIT
where I
LIMIT
is the desired current limit.
M
2A, Current-Limited, High-S ide
P-Channel S witc h with T hermal S hutdown
6
_______________________________________________________________________________________
V
IN
= 5V, I
OUT
= 1A, C
IN
= 1μF, C
OUT
= 120μF
A: V
ON
, 5V/div
B: V
OUT
, 2V/div
*REFER TOTYPICAL OPERATINGCIRCUIT
USB* CIRCUIT OUTPUT RISE TIME
A
B
C
D
0V
0V
0V
0A
500μs/div
C: I
OUT
, 0.5A/div
D: V
FAULT
, 2V/div
M
____________________________Typic al Operating Charac teristic s (c ontinued)
(T
A
= +25°C, unless otherwise noted.)
USB* CIRCUIT OUTPUT FALL TIME
A
B
C
D
0V
0V
0V
0A
500μs/div
V
IN
= 5V, I
OUT
= 1A, C
IN
= 1μF, C
OUT
= 120μF
A: V
ON
, 5V/div
B: V
OUT
, 2V/div
C: I
OUT
, 0.5A/div
D: V
FAULT
, 2V/div
M
_____________________Pin Desc ription
PIN
Input, P-channel MOSFET source.
Bypass IN with a 1μF capacitor to
ground.
IN
1, 4, 5,
12, 13, 16
FUNCTION
NAME
Switch output. P-channel MOSFET
drain. Bypass OUT with a 0.1μF
capacitor to GND.
OUT
2, 3, 6,
11, 14, 15
Ground
GND
8
Active-Low Switch-On Input. A logic
low turns the switch on.
ON
7
Fault-Indicator Output. This open-
drain output goes low when in cur-
rent limit or when the die temperature
exceeds +135°C.
FAULT
remains low
for Turn-On Time + 50μs during start-
up.
FAULT
10
Set Current-Limit Input. A resistor
from SET to ground sets the current
limit for the switch. R
SET
= 1,184 /
I
LIMIT
, where I
LIMIT
is the desired cur-
rent limit in amperes.
SET
9
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| MAX895LC/D | 功能描述:電源開關(guān) IC - 配電 Current-Limited High-Side P-Channel Dual Switches with Thermal Shutdown RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MAX895LESA | 功能描述:電源開關(guān) IC - 配電 Current-Limited High-Side PCh Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MAX895LESA+ | 功能描述:電源開關(guān) IC - 配電 Current-Limited High-Side PCh Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MAX895LESA+T | 功能描述:電源開關(guān) IC - 配電 Current-Limited High-Side PCh Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MAX895LESA-T | 功能描述:電源開關(guān) IC - 配電 Current-Limited High-Side PCh Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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