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參數(shù)資料
| 型號： | MAX4785-MAX4788 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 50mA/100mA Current-Limit Switches |
| 中文描述： | 50mA/100mA限流開關(guān) |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 266K |
| 代理商： | MAX4785-MAX4788 |
M
Detailed Description
The MAX4785
–
MAX4788 are forward/reverse current-
limited switches that operate from a 2.3V to 5.5V input
voltage range and guarantee a 50mA and 100mA mini-
mum current-limit threshold for different options. The
voltage drop across an internal sense resistor is com-
pared to two reference voltages to indicate a forward or
reverse current-limit fault. When the load current
exceeds the preset current limit for greater than the
fault-blanking time, the switch opens.
The MAX4786 and MAX4788 have an autoretry function
that turns on the switch again after an internal retry time
expires. If the faulty load condition is still present after
the blanking time, the switch turns off again and the
cycle is repeated. If the faulty load condition is not pre-
sent, the switch remains on.
The MAX4785 and MAX4787 do not have the autoretry
option and the switch remains in latch-off mode until
the ON pin or the input power is cycled from high to low
and then high again.
The undervoltage lockout (UVLO) circuit prevents erro-
neous switch operation when the input voltage goes too
low during startup conditions.
Reverse-Current Protection
The MAX4785
–
MAX4788 limit the reverse current (V
OUT
to V
IN
) from exceeding the maximum I
REV
value. The
switch is shut off and
FLAG
is asserted (MAX4785/
MAX4787) if the reverse current-limit condition persists
for more than the blanking time. This feature prevents
excessive reverse currents from flowing through the
device.
Switch-On/Off Control
Toggle ON high to enable the current-limited switches.
The switches are continuously on, only if V
IN
exceeds
the UVLO threshold (typically 2V) and there is no fault.
When a forward/reverse current fault is preset or the die
exceeds the thermal-shutdown temperature of +150
°
C,
OUT is internally disconnected from IN and the supply
current decreases to 8μA (latch off). The switch is now
operating in one of its off states. The switch off-state
also occurs when driving ON low, thus reducing the
supply current (shutdown) to 0.01μA. Table 1 illustrates
the ON/OFF state of the MAX4785
–
MAX4788 current-
limit switches.
50mA/100mA Current-Limit Switches
6
_______________________________________________________________________________________
N
BLANKING TIME
CIRCUITRY
REVERSE-CURRENT
DETECTOR
FORWARD CURRENT
DETECTOR
N
+2.0V
FLAG
OUT
IN
ON
GND
MAX4785/MAX4787
ONLY
LOGIC
AUTO-
RETRY
MAX4785
–
MAX4788
UNDERVOLTAGE
LOCKOUT
Figure 1. MAX4785–MAX4788 Functional Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4785EXK-T | 50mA/100mA Current-Limit Switches |
| MAX4785EXS-T | 50mA/100mA Current-Limit Switches |
| MAX4786EXS-T | 50mA/100mA Current-Limit Switches |
| MAX4787EXK-T | 50mA/100mA Current-Limit Switches |
| MAX4787EXS-T | 50mA/100mA Current-Limit Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4786EXS | 制造商:Maxim Integrated Products 功能描述:50MA/100MA CURRENT-LIMIT SWITCHES - Cut Tape Product |
| MAX4786EXS+ | 制造商:Maxim Integrated Products 功能描述:CURRENT LIMIT SW 1-IN 1-OUT 2.3V TO 5.5V 0.12A 4PIN SC-70 - Cut Tape Product |
| MAX4786EXS+T | 功能描述:電源開關(guān) IC - 配電 50mA/100mA Current Limit Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（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 |
| MAX4786EXS-T | 功能描述:電源開關(guān) IC - 配電 RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（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 |
| MAX4787EKIT+ | 功能描述:電源開關(guān) IC - 配電 50mA/100mA Current-Limit Switches RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（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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