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參數(shù)資料
| 型號： | MAX4773EUK-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | MO-178AB, SOT23-6 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大小： | 427K |
| 代理商： | MAX4773EUK-T |
MAX4772/MAX4773
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 cur-
rent limit. During tRETRY, when the switch is off, the cur-
rent 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 con-
sistent across the process and devices.
Latch Off (MAX4772)
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 5) or cycling the input voltage (Figure 5).
Fault Blanking
The MAX4772/MAX4773 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 MAX4772/MAX4773 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 switch with autoretry turns back on when
the device temperature drops approximately 15°C. The
switch with the latch off requires 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
200mA/500mA Selectable
Current-Limit Switches
8
_______________________________________________________________________________________
Figure 5. MAX4773 Latch-Off Fault Blanking
LOAD
CURRENT
SWITCH
STATUS
ON PIN
VOLTAGE
tBLANK
OFF
ON
(a)
(b)
LOAD
CURRENT
SWITCH
STATUS
IN PIN
VOLTAGE
OFF
ON
tBLANK
FLAG PIN
STATUS
FLAG PIN
STATUS
Figure 4. MAX4773 Autoretry Fault-Blanking Diagram
LOAD
CURRENT
SWITCH
STATUS
FLAG PIN
STATUS
tBLANK
OFF
ON
tRETRY
CURRENT
LIMIT
SHORT
CONDITION
REMOVED
tBLANK
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| MAX4773EUT-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(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 |
| MAX477EPA | 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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