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参数资料
| 型号： | FPF2701MPX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SWITCH 0.4-2A OCP 8MLP |
| 标准包装： | 3,000 |
| 系列： | AccuPower™ |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 114 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 可调 |
| 输入电压： | 2.8 V ~ 36 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-MLP（3x3） |
| 包装： | 带卷 (TR) |
Application Information
Description of Operation
The FPF270X family of current limit load switches is
designed to meet the power requirements of a variety of
applications with wide input voltage range of 2.8 V to
36 V and adjustable current-limit value. The FPF270X
family offers control and protection while providing
optimum operation current for safe design practices.
The core of each switch is a typical 88 m Ω (V IN = 12 V)
N-channel MOSFET and a controller capable of
functioning over an input voltage range of 2.8 V to 36 V.
FPF270X offers adjustable current limiting, under-
voltage lockout (UVLO), power-good indicator
(PGOOD), fault flag output (FLAGB), and thermal
shutdown protection. In the event of an over-current
condition, the load switch limits the load to the current
limit value. The current limit value for each switch can
be adjusted from 400 mA to 2 A through the ISET pin.
On/Off Control
The ON pin is active LOW for and controls the state of
the switch. Pulling the ON pin continuously to LOW
holds the switch in ON state. The switch moves into
OFF state when the ON pin is pulled HIGH. The ON pin
can be pulled HIGH to a maximum voltage of 5.5 V.
An under-voltage condition on the input voltage or a
junction temperature in excess of 140°C overrides the
ON control and turns off the switch. In addition, an over-
current condition causes the switch to turn off in the
FPF2700 and FPF2701 after the expiration of the
blanking time. The FPF2700 has an auto-restart feature
that automatically turns the switch ON again after the
auto-restart time. For the FPF2701, the ON pin must be
toggled to turn the switch on again. The FPF2702 does
not turn off in response to an over-current condition; it
remains operating in Constant-Current Mode as long as
ON is enabled and the thermal shutdown or UVLO have
not activated. The ON pin does not have internal pull-
down or pull-up resistors and should not be left floating.
Fault Reporting
Upon detection of an over-current condition, an input
UVLO, or an over-temperature condition, the FLAGB
signals the Fault Mode by activating LOW. In the event
of an over-current condition for the FPF2700 or
FPF2701, the FLAGB goes LOW at the end of the
blanking time (Figure 24 and Figure 25). FLAGB goes
LOW immediately for the FPF2702 (Figure 29). If the
over-current condition lasts longer than blanking time,
FLAGB remains LOW through the auto-restart time for
the FPF2700. For the FPF2701, FLAGB is latched LOW
and ON must be toggled to release it.
For FPF2702, FLAGB is LOW during a fault and
immediately returns HIGH at the end of the fault
condition. FLAGB is an open-drain MOSFET that
requires a pull-up resistor. The maximum pull-up voltage
During shutdown, the pull-down on FLAGB is disabled
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-limit
level is adjustable through an external resistor
connected between the ISET pin and GND.
The typical current limit level is adjustable from 510 mA
to 2.5 A. The minimum current limit (I LIM(MIN) ) range is
from 0.4 A to 2.0 A, including 20% current-limit
tolerance. The FPF2700 and FPF2701 have a blanking
time during which the switch acts as a constant-current
source (Figure 27). If the over-current condition persists
beyond the blanking time, the FPF2700 latches off and
shuts the switch off (Figure 32). If the ON pin is kept
active, an auto-restart feature releases the switch and
turns the switch on again after the auto-restart time
the blanking time, the FPF2701 latch-off feature shuts
the switch off. The switch is kept off until the ON pin is
toggled or input power is cycled. The FPF2702 has no
current-limit blanking period, so it remains in a constant-
current state until the ON pin is deactivated or the
thermal shutdown turns off the switch.
Besides the current-limiting functionality, the switch is
protected by the thermal shutdown protection and an
independent SOA protection circuit is available.
SOA Protection Current Limit (I OUT > 12 A)
FPF270X has an SOA protection feature to protect the
load switch in response to current surges exceeding
12 A in normal operation. If a short-circuit event occurs
(I OUT >12 A), the switch is turned off in about 1μs by an
independent Safe Operating Area (SOA) protection
circuit (Figure 26, Figure 28). This feature protects the
switch in case of sudden, high-current events at the
output, such as a short to GND. The switch turns on
automatically after a turn-on delay of about 2.7 ms.
Short-Circuit Current Limit (V OUT < V SCTH = 2 V)
When the output voltage drops below the short-circuit
threshold voltage, V SCTH , the current-limit value re-
conditions itself to the short-circuit current limit value,
which is 75% of the nominal current limit (0.75 x I LIM, )
reducing the power dissipation of the device. The V SCTH
value is set at 2 V. At about V OUT = 2.1 V, the switch is
removed from short-circuit current-limiting mode and the
current limit is set to the nominal current limit value.
Setting the Current Limit Value
FPF270X has an adjustable 0.4 A to 2.0 A minimum
current limit set through an external resistor, R SET ,
connected between ISET and GND. A precision R SET
value must be used, such as 1% tolerance or lower, to
minimize the total current limit tolerance of the system.
Use the following equation to calculate the value of the
resistor for intended typical current limit value:
to reduce current draw from the supply. A 100 k Ω pull-
up resistor is recommended in the application.
R SET ( k ? ) ?
277 . 5
I LIM ( TYP ) ( A )
(1)
I LIM(TYP) is the typical current limit value based on a R SET .
? 2010 Fairchild Semiconductor Corporation
FPF2700 / FPF2701 / FPF2702 ? Rev. 1.0.3
11
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FPF2701MX | 功能描述:电源开关 IC - POE / LAN AccuPower Advanced Load Mngmnt Products RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| FPF2702MPX | 功能描述:电源开关 IC - POE / LAN AccuPower Advanced Load Mngmnt Products RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| FPF2702MX | 功能描述:电源开关 IC - POE / LAN AccuPower Advanced Load Mngmnt Products RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| FPF28 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| FPF29 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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