参数资料
| 型号： | FPF2165R |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SW FULL FUNCT ADJ 6MLP |
| 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-MLP |
| 供应商设备封装： | 6-MicroFET（2x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 1218 (CN2011-ZH PDF) |
| 其它名称： | FPF2165RDKR |
Description of Operation
The FPF2165R is a current limited switch 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 0.15A 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. An
undervoltage on V IN or a junction temperature in excess of
140°C overrides the ON control to turn off the switch. The
FPF2165R 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 LOW. With the FPF2165R, FLAGB is LOW
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 FLAGB is disabled to reduce
current draw from the supply.
Current Limiting
The current limit ensures that the current through the switch
doesn't exceed a maximum value while not limiting at less than
a minimum value. The current at which the parts will limit is
adjustable through the selection of an external resistor
connected to ISET. Information for selecting the resistor is found
in the Application Info section. The FPF2165R has 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
switch is loaded with a heavy load. When the output voltage
drops below V SCTH , 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 V SCTH
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.
Under-Voltage Lockout
The under-voltage lockout turns-off the switch if the input
voltage drops below the under-voltage lockout threshold. With
the ON pin active the input voltage rising above the under-
voltage lockout threshold will cause a controlled turn-on of the
switch which limits current over-shoots.
Reverse Current Blocking
The FPF2165R 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 that 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 LOW and output voltage becomes greater than input
voltage, no current can flow from the output to the input.
FLAGB operation is independent of the reverse current blocking
and does not report a fault condition if this feature is activated.
Thermal Shutdown
The thermal shutdown protects the die from internally or
externally generated excessive temperatures. During an
over-temperature condition the FLAGB is activated and the
switch is turned-off. The switch automatically turns-on again if
temperature of the die drops below the threshold temperature.
? 2008 Fairchild Semiconductor Corporation
FPF2165R Rev. 1.0.1
7
www.fairchildsemi.com
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