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| 型号： | FPF2165 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SWITCH ADJ CURR 6-MLP |
| 标准包装： | 1 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 160 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 可调 |
| 输入电压： | 1.8 V ~ 5.5 V |
| 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-MicroFET（2x2） |
| 包装： | 标准包装 |
| 其它名称： | FPF2165DKR |
Description of Operation
The FPF2163, FPF2164, and FPF2165 are current limited
switches that protect systems and loads which can be damaged
or disrupted by the application of high currents. The core of
each device is a 0.12 ? P-channel MOSFET and a controller
capable of functioning over a wide input operating range of 1.8-
5.5V. The controller protects against system malfunctions
through current limiting, undervoltage lockout and thermal
shutdown. The current limit is adjustable from 150mA to 1.5A
through the selection of an external resistor.
On/Off Control
The ON pin controls the state of the switch. When ON is high,
the switch is in the on state. Activating ON continuously holds
the switch in the on state so long as there is no fault. For all
versions, an undervoltage on V IN or a junction temperature in
excess of 140°C overrides the ON control to turn off the switch.
In addition, excessive currents will cause the switch to turn off in
the FPF2163 and FPF2164. The FPF2163 has an Auto-Restart
feature which will automatically turn the switch on again after
450ms. For the FPF2164, the ON pin must be toggled to turn-on
the switch again. The FPF2165 does not turn off in response to
an over current condition but instead remains operating in a
constant current mode so long as ON is active and the thermal
shutdown or undervoltage lockout have not activated.
The ON pin control voltage and V IN pin have independent
recommended operating ranges. The ON pin voltage can be
driven by a voltage level higher than the input voltage.
Fault Reporting
Upon the detection of an over-current, an input undervoltage, or
an over-temperature condition, the FLAGB signals the fault
mode by activating LO. For the FPF2163 and FPF2164, the
FLAGB goes LO at the end of the blanking time while FLAGB
goes LO immediately for the FPF2165. FLAGB remains LO
through the Auto-Restart Time for the FPF2165. For the
FPF2164, FLAGB is latched LO and ON must be toggled to
release it. With the FPF2165, FLAGB is LO during the faults and
immediately returns HI at the end of the fault condition. FLAGB
is an open-drain MOSFET which requires a pull-up resistor
between VIN and FLAGB. During shutdown, the pull-down on
switch is loaded with a heavy load. When the output voltage
drops below VSCTH, short circuit detection threshold voltage,
the current limit value re-conditioned and short circuit current
limit value is decreased to 62.5% of the current limit value. This
keeps the power dissipation of the part below a certain limit
even at dead short conditions at 5.5V input voltage. The VSCTH
value is set to be 1V. At around 1.1V of output voltage the
switch is removed from short circuit current limiting mode and
the current limit is set to the current limit value.
Undervoltage Lockout
The undervoltage lockout turns-off the switch if the input voltage
drops below the undervoltage lockout threshold. With the ON
pin active the input voltage rising above the undervoltage
lockout threshold will cause a controlled turn-on of the switch
which limits current over-shoots.
Reverse Current Blocking
The entire FPF2163/65 family has a Reverse Current Blocking
feature that protects input source against current flow from
output to input. For a standard USB power design, this is an
important feature which protects the USB host from being
damaged due to reverse current flow on V BUS . The reverse
current blocking feature is active when the load switch is turned
off.
If ON pin is LO and output voltage become greater than input
voltage, no current can flow from the output to the input . The
FLAGB operation is independent of the Reverse Current
blocking feature and will not report a fault condition if this
feature is activated.
Thermal Shutdown
The thermal shutdown protects the die from internally or exter-
nally generated excessive temperatures. During an over-tem-
perature condition the FLAGB is activated and the switch is
turned-off. The switch automatically turns-on again if tempera-
ture of the die drops below the threshold temperature.
Timing Diagram
FLAGB is disabled to reduce current draw from the supply.
90%
Current Limiting
The current limit ensures that the current through the switch
doesn't exceed a maximum value while not limiting at less than
V ON
10%
a minimum value. The current at which the parts will limit is
90%
90%
adjustable through the selection of an external resistor
connected to ISET. Information for selecting the resistor is found
V OUT
10%
10%
in the Application Info section. The FPF2163 and FPF2164
t R
td OFF
have a blanking time of 30ms, nominally, during which the
switch will act as a constant current source. At the end of the
blanking time, the switch will be turned-off. The FPF2165 has
td ON
t ON
t F
t OFF
no current limit blanking period so it will remain in a constant
current state until the ON pin is deactivated or the thermal
shutdown turns-off the switch.
For preventing the switch from large power dissipation during
heavy load a short circuit detection feature is introduced. Short
circuit condition is detected by observing the output voltage.
The switch is put into short circuit current limiting mode if the
FPF2163/4/5 Rev. I
9
where:
td ON
t R
t ON
td OFF
t F
t OFF
=
=
=
=
=
=
Delay On Time
V OUT Rise Time
Turn On Time
Delay Off Time
V OUT Fall Time
Turn Off Time
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FPF2165_SBAA013 | 制造商:Fairchild Semiconductor Corporation 功能描述:FULL FUNCTION LOAD SWITCH - Tape and Reel |
| FPF2165R | 功能描述:开关 IC - 各种 Full Func Load Swtch w/Adj Curr Limit RoHS:否 制造商:Fairchild Semiconductor 开启电阻（最大值）: 电源电压-最大:4.4 V 电源电压-最小:2.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WLCSP-9 封装:Reel |
| FPF2165SBAA013 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FPF2172 | 功能描述:开关 IC - 各种 LOW_VOLTAGE RoHS:否 制造商:Fairchild Semiconductor 开启电阻（最大值）: 电源电压-最大:4.4 V 电源电压-最小:2.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WLCSP-9 封装:Reel |
| FPF2172_08 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:IntelliMAXa?￠ Advanced Load Management Products |
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