参数资料
| 型号： | FPF2165R |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 8/11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 |
Application Information
Typical Application
V IN
FPF2165R
V OUT
LOAD
FLAGB
1.8V-5.5V
OFF ON
ON
ISET
R2 = 500 ?
GND
C2 = 0.1μF
C1 = 4.7μF
R SET
Setting Current Limit
The FPF2165R 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,
I LIM = 340.1 x R SET-1.0278 (1)
The table below can be used to select RSET. 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 RSET resistor would be 570 ? .
Current Limit Various R SET Values
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush 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 4.7μF 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.
Output Capacitor
A 0.1uF capacitor C OUT , should be placed between V OUT and
GND. This capacitor will prevent parasitic board inductances
R SET
[ ? ]
1840
1391
937
Min. Current
Limit
[mA]
135
180
270
Typ. Current
Limit
[mA]
150
200
300
Max. Current
Limit
[mA]
165
220
330
from forcing V OUT below GND when the switch turns-off.
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 0.77A and
this will result in a power dissipation of,
708
632
360
405
400
450
440
495
P = (I LIM ) 2 x R DS = (0.77) 2 x 0.12 = 71.148mW
(2)
570
478
411
361
322
450
540
630
720
810
500
600
700
800
900
550
660
770
880
990
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. This is more
power than the package can dissipate, but the thermal
shutdown of the part will activate to protect the part from
damage due to excessive heating. A short on the output will
cause the part to operate in a constant current state dissipating
a worst case power of,
290
900
1000
1100
P(max) = V IN (max) x I LIM (max)
(3)
265
243
225
209
196
990
1080
1170
1260
1350
1100
1200
1300
1400
1500
1210
1320
1430
1540
1650
= 5.5 x 0.77 = 4.235W
This large amount of power will activate the thermal shutdown
and the part will cycle in and out of thermal shutdown so long as
the ON pin is active and the short is present.
? 2008 Fairchild Semiconductor Corporation
FPF2165R Rev. 1.0.1
8
www.fairchildsemi.com
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