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參數(shù)資料
| 型號(hào)： | MAX4798EUK+TG05 |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 7/9頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 1X1 SOT23-5 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 功能： | 開(kāi)關(guān) |
| 電路： | 1 x 1:1 |
| 導(dǎo)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(yīng)商設(shè)備封裝： | SOT-23-5 |
| 包裝： | 帶卷 (TR) |
MAX4795–MAX4798
450mA/500mA Current-Limit Switches
_______________________________________________________________________________________
7
Autoretry (MAX4796/MAX4798)
When the forward or reverse current-limit threshold is
exceeded, tBLANK timer begins counting (Figure 2).
The timer resets if the overcurrent condition disappears
before tBLANK has elapsed. A retry time delay, tRETRY,
is started immediately after tBLANK has elapsed and
during that time, the switch is latched off and FLAG
asserts. At the end of tRETRY, the switch is turned on
again. If the fault still exists, the cycle is repeated. If the
fault has been removed, the switch stays on and FLAG
deasserts.
The autoretry feature saves system power in the case
of an overcurrent or short-circuit condition. During
tBLANK, when the switch is on, the supply current is at
the current limit. During tRETRY, when the switch is off,
the current through the switch is zero. Instead of
observing the full load current, the switch sees the
equivalent load current times duty cycle or ISUPPLY =
ILOAD tBLANK/(tBLANK + tRETRY). With a typical
tBLANK = 37ms and typical tRETRY = 555ms, the duty
cycle is 6%, which results in a 94% power savings over
the switch being on the entire time. The duty cycle is
consistent across the process and devices.
Latchoff (MAX4795/MAX4797)
When the forward or reverse current-limit threshold is
exceeded, tBLANK timer begins counting. The timer
resets if the overcurrent condition disappears before
tBLANK has elapsed. The switch is shut off and FLAG
asserts if the overcurrent condition continues up to the
end of the blanking time. Reset the switch by either tog-
gling ON (Figure 3) or cycling the input voltage.
Fault Blanking
The MAX4795–MAX4798 feature 14ms (min) fault blank-
ing. Fault blanking allows current-limit faults, including
momentary short-circuit faults that occur when hot
swapping a capacitive load, and also ensures that no
fault is issued during power-up. When a load transient
causes the device to enter current limit, an internal
counter starts. If the load-transient fault persists beyond
the fault-blanking timeout, FLAG asserts low. Load-tran-
sient faults less than tBLANK do not cause a FLAG out-
put assertion. Only current-limit faults are blanked.
A thermal fault causes FLAG to assert immediately and
does not wait for the blanking time.
Thermal Shutdown
The MAX4795–MAX4798 have a thermal-shutdown fea-
ture to protect the devices from overheating. The switch
turns off and FLAG goes low immediately (no fault
blanking) when the junction temperature exceeds
+150°C. The switches with autoretry turn back on when
the device temperature drops approximately 15°C. The
switches with latchoff require ON cycling.
Applications Information
Input Capacitor
To limit the input voltage drop during momentary output
short-circuit conditions, connect a capacitor from IN to
GND. A 0.1F ceramic capacitor is adequate for most
applications; however, higher capacitor values further
reduce the voltage drop at the input and are recom-
mended for lower voltage applications.
LOAD
CURRENT
SWITCH
STATUS
ON PIN
VOLTAGE
tBLANK
OFF
ON
(a)
LOAD
CURRENT
SWITCH
STATUS
IN PIN
VOLTAGE
OFF
ON
tBLANK
FLAG PIN
STATUS
FLAG PIN
STATUS
Figure 3. MAX4795/MAX4797 Latch-Off Fault Blanking
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| MAX479ACPD | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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| MAX479CPD+ | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX479CSD | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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