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| 型號： | MAX4798EUK+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/9頁 |
| 文件大小： | 0K |
| 描述： | IC ANALOG SWITCH 1X1 SOT23-5 |
| 產(chǎn)品培訓模塊： | ISP Current Limit Switches Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 功能： | 開關 |
| 電路： | 1 x 1:1 |
| 導通狀態(tài)電阻： | 360 毫歐 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 2 V ~ 4.5 V |
| 電流 - 電源： | 80µA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SC-74A，SOT-753 |
| 供應商設備封裝： | SOT-23-5 |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 1421 (CN2011-ZH PDF) |
| 其它名稱： | MAX4798EUK+TDKR |
MAX4795–MAX4798
450mA/500mA Current-Limit Switches
6
_______________________________________________________________________________________
Detailed Description
The MAX4795–MAX4798 are forward/reverse current-
limited switches that operate from a 2V to 4.5V input
voltage range and guarantee a 450mA and 500mA
minimum current-limit threshold for different options.
The voltage drop across an internal sense resistor is
compared to two reference voltages to indicate a for-
ward or reverse current-limit fault. When the load cur-
rent exceeds the preset current limit for greater than
the fault-blanking time, the switch opens.
The MAX4796 and MAX4798 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 MAX4795 and MAX4797 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.
Reverse-Current Protection
The MAX4795–MAX4798 limit the reverse current (VOUT
to VIN) from exceeding the maximum IREV value. The
switch is shut off and FLAG is asserted 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 if there is no fault.
When a forward/reverse current fault is present or the die
exceeds the thermal-shutdown temperature of +150°C,
OUT is internally disconnected from IN and the supply
current decreases to 8A (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 0.01A. Table 1 illustrates the
ON/OFF state of the MAX4795–MAX4798 current-limit
switches.
FLAG Indicator
The MAX4795–MAX4798 feature a latched output (FLAG).
Whenever an overcurrent condition is encountered,
the MAX4795/MAX4797 latch FLAG low and turn the
switch off. The MAX4796/MAX4798 latch FLAG low and
keep it low until the overcurrent condition is removed.
During this time, the switch cycles on and off in the
autoretry mode. When the overcurrent condition is
removed, FLAG deasserts and the switch turns on
(Figure 2). FLAG is an open-drain output transistor and
requires an external pullup resistor from FLAG to IN.
During shutdown (ON is low), the pulldown on FLAG
output is released to limit power dissipation. FLAG goes
low when any of the following conditions occur:
The die temperature exceeds the thermal-shutdown
temperature limit of +150°C.
The device is in current limit for more than the fault-
blanking period.
The switch is in autoretry.
SWITCH
STATUS
tBLANK
OFF
ON
tRETRY
CURRENT
LIMIT
SHORT
CONDITION
REMOVED
FLAG PIN
STATUS
tBLANK
Figure 2. MAX4796/MAX4798 Autoretry Fault-Blanking Diagram
ON
FAULT
SWITCH ON/OFF
SUPPLY CURRENT MODE
Low
X
OFF
Shutdown
High
Thermal
OFF immediately (tBLANK period does not apply)
Latchoff
OFF after tBLANK period has elapsed
Latchoff
High
Current limit
ON during tBLANK period, OFF during tRETRY period for the
MAX4796 and MAX4798; cycle repeats until fault is removed
See the Autoretry section
Table 1. MAX4795–MAX4798 Switch Truth Table
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| MAX479CPD+ | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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