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參數(shù)資料
| 型號： | MAX14523AATA+T |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 11/11頁 |
| 文件大小： | 0K |
| 描述： | IC CURRENT LIMIT SWITCH 8-DFN |
| 產(chǎn)品培訓(xùn)模塊： | ISP Current Limit Switches Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 功能： | 電流開關(guān) |
| 精確度： | ±10% |
| 輸入電壓： | 1.7 V ~ 5.5 V |
| 電流 - 輸出： | 可調(diào) |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-TDFN-EP（3x3） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | MAX14523AATA+TDKR |
MAX14523A/MAX14523AL/MAX14523B/MAX14523C
250mA to 1.5A, Adjustable
Current-Limit Switches
_______________________________________________________________________________________
9
The autoretry feature saves system power in case of an
overcurrent or short-circuit condition. During tBLANK
time, when the switch is on, the supply current is held
at the current limit. During time tRETRY, when the switch
is off, the current through the switch is zero. Thus, the
average output current is much less than the pro-
grammed current limit. Calculate the average output
current using the following equation:
ILOAD = ILIM [(tBLANK )/(tBLANK + tRETRY)]
With a typical tBLANK = 17.5ms and typical tRETRY =
560ms, the duty cycle is 3%, resulting in a 97% power
savings over the switch being on the entire time.
Latchoff (MAX14523B)
When the forward current reaches the current thresh-
old, the tBLANK timer begins counting (Figure 3). FLAG
asserts if an overcurrent condition is present for greater
than tBLANK time. The timer resets if the overcurrent
condition disappears before tBLANK has elapsed.
The switch turns off if the overcurrent condition contin-
ues beyond the blanking time. Reset the switch by
either toggling the control logic (ON or ON) or cycling
the input voltage. If the die temperature exceeds
+170°C (typ) due to self heating, the MAX14523B goes
into thermal shutdown until the die temperature
drops by approximately 15°C (see the
Thermal
Shutdown section).
Continuous Current Limit (MAX14523C)
When the forward current reaches the forward-current
threshold, the MAX14523C limits the output current to
the programmed current limit. FLAG asserts if the cur-
rent limit is present for tBLANK and deasserts when the
overload condition is removed. In this mode, if die tem-
perature exceeds +170°C (typ) due to self heating, the
MAX14523C goes into thermal shutdown until the die
temperature drops by approximately 15°C (see the
Thermal Shutdown section).
Switch-On/Off Control
The ON input for the MAX14523A/MAX14523B/
MAX14523C and ON input for the MAX14523AL control
the switch, see Table 1. Toggle ON for the MAX14523B
to reset the fault condition once the short-circuit current
is detected and the device shuts down.
Reverse-Current Protection
The MAX14523A/MAX14523AL/MAX14523B/MAX14523C
feature a reverse-current protection circuit that limits
the backflow current to 2A when the reverse-current
protection circuitry has tripped. The switch turns off and
FLAG asserts without waiting for tBLANK to elapse. The
switch turns back on and FLAG deasserts when VIN -
VOUT drops below the reverse-current threshold by
95mV (typ).
FLAG Indicator
FLAG is an open-drain fault indicator output and
requires an external pullup resistor to a DC supply.
FLAG goes low when any of the following conditions
occur:
The blanking time has elapsed
The reverse-current protection has tripped
The die temperature exceeds +170°C
SETI is connected to ground.
Thermal Shutdown
Thermal-shutdown circuitry protects the devices from
overheating. The switch turns off and FLAG goes low
immediately when the junction temperature exceeds
+170°C (typ). The switch turns on again after the
device temperature drops by approximately 15°C (typ).
Applications Information
Setting the Current Limit/Threshold
A resistor from SETI to ground programs the current
limit/threshold value for the MAX14523A/MAX14523AL/
MAX14523B/MAX14523C. Table 2 lists various current
limit/thresholds set by different resistor values at SETI.
Leaving SETI unconnected selects a 0 current
limit/threshold. Connecting SETI to ground asserts
FLAG.
Use the following formula to calculate the current limit:
Rk
V
ImA
k
SETI
LIM
()
.(
)
ΩΩ
=
141400
248
MAX14523A
MAX14523B
MAX14523C
MAX14523AL
ON
ON
SWITCH STATUS
0
1
Off
1
0
On
Table 1. Switch Truth Table
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX14523BATA/V+ | 制造商:Maxim Integrated Products 功能描述:INDUSTRY'S HIGHEST ACCURACY, ADJUSTABLE, 1.5A CURRENT-LIMIT - Rail/Tube |
| MAX14523BATA/V+T | 功能描述:電源開關(guān) IC - 配電 Adjustable 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(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 |
| MAX14523BATA+ | 制造商:Maxim Integrated Products 功能描述:250MA TO 1.5A ADJUSTABLE CURRENT-L - Rail/Tube |
| MAX14523BATA+T | 功能描述:電源開關(guān) IC - 配電 Adjustable 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(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 |
| MAX14523BETA+ | 制造商:Maxim Integrated Products 功能描述:250MA TO 1.5A, ADJUSTABLE CURRENT-LIMIT SWITCHES - Rail/Tube |
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