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参数资料
| 型号： | MAX4797ETT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 1X1 6TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 开关 |
| 电路： | 1 x 1:1 |
| 导通状态电阻： | 360 毫欧 |
| 电流 - 电源： | 125µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 供应商设备封装： | 6-TDFN 裸露焊盘（3x3） |
| 包装： | 带卷 (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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4797EUK | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
| MAX4797EUK-T | 功能描述:电源开关 IC - 配电 RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX4798ETT+T | 功能描述:电源开关 IC - 配电 450mA/500mA Current Limit Switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX4798ETT-T | 功能描述:电源开关 IC - 配电 RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX4798EUK | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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