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参数资料
| 型号： | FPF2302MX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SW 2CH LATCH-OFF 8-SOP |
| 标准包装： | 2,500 |
| 系列： | IntelliMax™ |
| 类型： | 高端开关 |
| 输出数： | 2 |
| Rds（开）： | 140 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 1.3A |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 带卷 (TR) |
| 产品目录页面： | 1218 (CN2011-ZH PDF) |
10K Ω
10K Ω
Host
5V
IN
FLAGB(A)
FLAGB(B)
FPF2300/2/3
1 μ F
OFF ON
ONA
OUTA
OFF ON
ONB
GND
OUTB
33 μ F
Downstream
USB Port
Figure 40. Self-Powered USB Port for High Current Demand
High current, over 2A, is sometimes required to supply enough
power to downstream functions. As shown in Figure 40, a 2.2A
Power Dissipation
During normal operation as a switch, the power dissipation of
the device is small and has little effect on the operating
temperature of the part. The maximum power dissipation for
both switches while the switch is in normal operation occurs just
before both channels enter into current limit. This may be
calculated using the formula:
P D_MAX(Normal Operation) = 2 x (I LIM(MIN) ) 2 x R ON(MAX) (3)
For example, for a 5V application, maximum normal operation
power loss while both switches delivering output current up to
1.1A, can be calculated as:
minimum load current can be achieved by tying dual outputs
together.
If the part goes into current limit, the maximum power
dissipation occurs when the output of switch is shorted to
ground. For the FPF2300 the power dissipation scales with the
auto-restart time, t RSTRT , and the over-current blanking time,
t BLANK . In this case, the maximum power dissipated for the
FPF2300 is::
t BLANK
P D_MAX(CurrentLimit) = 2 x x IN (MAX) x I LIM(MAX)
t BLANK + t RSTRT
(7)
which results in:
P D_MAX(Normal Operation)(IN = 5V) = 2 x (1.1) x 0.14
2
= 338mW
(4)
P D_MAX(CurrentLimit) = 2 x
10
10 + 504
x 5.5 x 1.5 = 321mW (8)
T J = P D x R θ JA + T A
The maximum junction temperature should be limited to 125°C
under normal operation. Junction temperature can be calcu-
lated using the formula below:
(5)
where:
T J is junction temperature;
P D is power dissipation across the switch;
R θ JA is thermal resistance junction to ambient of the package;
T A is ambient temperature.
For the example, T J(MAX)(Normal operation) for an SO8 package
with T A =25°C while both switches are delivering up to 1.1A is
calculated as:
T J(MAX)(NormalOperation)
Note that this is below the maximum package power dissipation
and the thermal shutdown feature protection provides additional
safety to protect the part from damage due to excessive
heating. The junction temperature is only able to increase to the
thermal shutdown threshold. Once this temperature has been
reached, toggling ON has no affect until the junction
temperature drops below the thermal shutdown exit
temperature. For the FPF2303, a short on both outputs causes
both switches to operate in a constant current state and
dissipate a worst-case power of:
P MAX = 2 x IN (MAX) x I LIM(MAX) = 2 x 5.5 x1.5 = 16.5 W (9)
As both FPF2303 outputs are connected to GND.
This power dissipation is significant and activates both thermal
shutdown blocks and the part can cycle in and out of thermal
shutdown as long as the ON pin is activated (pulled LOW) and
=P
D_MAX(Normal Operation)(IN = 5V)
x 125 + 25
(6)
the output short is present.
= 78.4°C
? 2009 Fairchild Semiconductor Corporation
FPF2300/02/03 ? Rev. 1.1.3
14
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FPF2303 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual-Output Current Limit Switch |
| FPF2303MPX | 功能描述:电源开关 IC - 配电 Int. Load Switch w/ 1.3A Typ Curr Limit 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 |
| FPF2303MX | 功能描述:电源开关 IC - 配电 Int. Load Switch w/ 1.3A Typ Curr Limit 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 |
| FPF2310 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual-Output Adjustable Current Limit Switch |
| FPF2310_10 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual-Output Adjustable Current Limit Switch |
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