参数资料
| 型号： | FPF2124 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SWITCH ADVANCED SOT23-5 |
| 产品变化通告： | Mold Compound Change 12/Dec/2007 |
| 标准包装： | 1 |
| 系列： | IntelliMax™ |
| 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： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1217 (CN2011-ZH PDF) |
| 其它名称： | FPF2124DKR |
Application Information
Typical Application
V IN
V OUT
FPF2123- FPF2125
C1=4.7 F
Battery
5.5V
OFF ON
5.5V MAX
ON
GND
ISET
R SET
C2=0.1 F
R2=110
R SET = ----------
Setting Current Limit
The FPF2123, FPF2124, and FPF2125 have a current limit
which is set with an external resistor connected between ISET
and GND. This resistor is selected by using the following
equation,
460
I LIM
Current Limit Various R SET Values
R SET Min. Current Typ. Current
[ ] Limit Limit
[mA] [mA]
309 1120 1490
340 1010 1350
Max. Current
Limit
[mA]
1860
1690
R SET is in Ohms and that of I LIM is Amps
The table below can also be used to select R SET . A typical
application would be the 500mA current that is required by a
single USB port. Using the table below an appropriate selection
for the R SET resistor would be 604 . This will ensure that the
port load could draw 570mA, but not more than 950mA.
Likewise for a dual port system, an R SET of 340 would always
deliver at least 1120mA and never more than 1860mA.
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch turns-on into a discharged load
capacitance or a short-circuit, a capacitor needs to be placed
between V IN and GND. A 4.7 F ceramic capacitor, C IN , must be
placed close to the V IN pin. A higher value of C IN can be used to
further reduce the voltage drop experienced as the switch is
turned on into a large capacitive load.
374
412
453
499
549
576
604
732
887
1070
1300
1910
3090
920
840
760
690
630
600
570
470
390
320
260
180
110
1230
1120
1010
920
840
800
760
630
520
430
350
240
150
1540
1400
1270
1150
1050
1000
950
790
650
540
440
300
190
P = ( I LIM ) × R ON = ( 1.5 ) × 0.125 = 281mW
C OU T ( max ) = -----------------------------------------------------------------
Output Capacitor
A 0.1 F capacitor, C OUT , should be placed between V OUT and
GND. This capacitor will prevent parasitic board inductances
from forcing V OUT below GND when the switch turns-off. For the
FPF2123 and FPF2124, 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 determined
from the following formula,
I LIM ( min ) × t BLANK ( min )
V IN
Power Dissipation
During normal operation as a switch, the power dissipated in the
part will depend upon the level at which the current limit is set.
The maximum allowed setting for the current limit is 1.5A and
this will result in a typical power dissipation of,
2 2
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2123 the power dissipation will scale by the Auto-Restart
Time, t RESTART , and the Over Current Blanking Time, t BLANK , so
that the maximum power dissipated is,
P ( max ) = --------------------------------------------------------------------------------- × V IN ( max ) × I LIM ( max )
= ------------------- × 5.5 × 1.5 = 1.65W
t BL ANK ( max )
t RESTART ( min ) + t BLANK ( max )
20
80 + 20
(4)
FPF2123-FPF2125 Rev. F
10
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FPF2125 | 功能描述:功率驱动器IC ADV LOAD MANAGEMENT RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FPF2140 | 功能描述:电源开关 IC - 配电 Full Function Load Switch 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 |
| FPF2140_ABB3086B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FPF2140_ABB3086D WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FPF2142 | 功能描述:电源开关 IC - 配电 Full Function Load Switch 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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