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參數(shù)資料
| 型號： | FPF2125 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | IntelliMAX Advanced Load Management Products |
| 中文描述： | 0.8 A BUF OR INV BASED PRPHL DRVR, PDSO5 |
| 封裝： | 1.60 MM, MO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 454K |
| 代理商： | FPF2125 |
10
www.fairchildsemi.com
FPF2123-FPF2125 Rev. C
F
Application Information
Typical Application
OFF ON
ON
V
IN
GND
FPF2123- FPF2125
ISET
V
OUT
Battery
1.8V-5.5V
C1 = 10
μ
F
R1 = 100K
C2 = 0.1
μ
F
LOAD
R2 = 499
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,
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 0.1uF 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 0.1uF 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,
Current Limit Various R
SET
Values
R
SET
[
]
Limit
[mA]
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,
(1.5)
R
)
(I
ON
LIM
=
=
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,
LIM
SET
I
460
R
=
IN
BLANK
LIM
OUT
V
(min)
t
(max)
I
(max)
C
=
Min. Current
Typ. Current
Limit
[mA]
Max. Current
Limit
[mA]
309
1120
1490
1860
340
1010
1350
1690
374
920
1230
1540
412
840
1120
1400
453
760
1010
1270
499
690
920
1150
549
630
840
1050
576
600
800
1000
604
570
760
950
732
470
630
790
887
390
520
650
1070
320
430
540
1300
260
350
440
1910
180
240
300
3090
110
150
190
81mW
2
0.125
2
2
=
(2)
(1)
(3)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FPF2140 | 功能描述:電源開關(guān) IC - 配電 Full Function Load Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體: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:電源開關(guān) IC - 配電 Full Function Load Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| FPF2143 | 功能描述:開關(guān) IC - 各種 Full Function Load Switch RoHS:否 制造商:Fairchild Semiconductor 開啟電阻（最大值）: 電源電壓-最大:4.4 V 電源電壓-最小:2.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WLCSP-9 封裝:Reel |
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