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参数资料
| 型号： | FPF2194 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SWITCH FULL FUNCT 6WLCSP |
| 标准包装： | 1 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 80 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-UFBGA，WLCSP |
| 供应商设备封装： | 6-WLCSP |
| 包装： | 标准包装 |
| 其它名称： | FPF2194DKR |
Application Information
Figure 28.
Typical Application
R SET ?
I LIM
Setting Current Limit
The FPF2193, FPF2194, and FPF2195 current limit is
set with an external resistor connected between I SET and
GND. This resistor is selected using the following
equation:
551.6
(1)
R SET is in ? and I SET is in Amps.
Table 1 can also be used to select R SET . A typical
application would be the 500 mA current required by a
single USB port. Using Table 1, an appropriate selection
for the R SET resistor would be 788 ? . This ensures that
the port load could draw 525 mA, but not more than
875 mA. Likewise for a dual-port system; an R SET of
368 ? always delivers at least 1125 mA and never more
than 1875 mA.
Input Capacitor
To limit the voltage drop on the input supply caused by
transient inrush currents when the switch is turned on
into a discharged load capacitor or a short-circuit, a
capacitor needs to be placed between V IN and GND. A
0.1 μF ceramic capacitor, C IN , placed close to the pins is
usually sufficient. Higher values of C IN can be used to
further reduce the voltage drop.
Output Capacitor
A 0.1 μF capacitor, C OUT , should be placed between
V OUT and GND. This capacitor prevents parasitic board
inductances from forcing V OUT below GND when the
switch turns off. For the FPF2193 and FPF2194, the
total output capacitance needs to be kept below a
maximum value, C OUT (max), to prevent the part from
registering an over-current condition and turning off the
switch. The maximum output capacitance can be
Table 1.
Current Limit Various R SET Values
determined from the following formula:
R SET ( ? )
368
Min. Current
Limit (mA)
1125
Typ. Current
Limit (mA)
1500
Max. Current
Limit (mA)
1875
C OUT (max) ?
I LIM (max) ? t BLANK (min)
V IN
(2)
441
552
613
690
788
919
1103
1226
1379
1576
928
750
675
600
525
450
375
338
300
263
1250
1000
900
800
700
600
500
450
400
350
1562
1250
1125
1000
875
750
625
563
500
438
Power Dissipation
During normal operation as a switch, the power
dissipated depends upon the level at which the current
limit is set. The maximum allowed setting for the current
limit is 1.5 A and results in a power dissipation of :
P ? ( I LIM ) 2 ? R ON ? ( 1 . 5 ) 2 ? 0 . 055 ? 123 . 75 mW (3)
If the part goes into current limit, the maximum power
dissipation occurs when the output is shorted to ground.
For the FPF2193, the power dissipation scales by the
auto-restart time, t RSTRT , and the over-current blanking
time, t BLANK , so that the maximum power dissipated is:
t BLANK
?
? 5 . 5 ? 1 . 5 ? 515 . 6 mW
1839
2206
2758
3677
5516
15800 (4)
225
188
150
113
75
35
300
250
200
150
100
45
375
313
250
188
125
60
P (max) ? ? V IN (max) ? I LIM (max)
t BLANK ? t RSTRT
30
30 ? 450
(4)
Note:
4.
FPF2195BUCX only.
? 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 ? Rev. 1.0.8
11
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FPF2194_12 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Full-Function Load Switch with Adjustable Current Limit |
| FPF2195 | 功能描述:电源开关 IC - 配电 Full Funct Load w/Adj 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 |
| FPF2195_SN00194 | 制造商:Fairchild Semiconductor Corporation 功能描述:Full Function Load Swtich |
| FPF2195BUCX | 制造商:Fairchild Semiconductor Corporation 功能描述:IC LOAD SWITCH FULL FUNCT 6WLCSP 制造商:Fairchild Semiconductor Corporation 功能描述:Power Switch ICs - Power Distribution Full Function Load Switch with Adjustable Current Limit |
| FPF2200 | 功能描述:电源开关 IC - 配电 Integrated w/500mA Precision Crnt 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 |
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