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参数资料
| 型号： | FPF2313MPX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SW 2CH ADJ CURR 8-MLP |
| 标准包装： | 1 |
| 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： | 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： | 8-MLP |
| 供应商设备封装： | 8-MLP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | FPF2313MPXDKR |
Application Information
Host (5V)
1μF
IN
ISETA
ISETB
Downstream
USB Port
OFF
ON
ONA
FPF2310/2/3
OUTA
33μF
OFF
ON
ONA
GND
OUTB
Downstream
USB Port
33μF
Figure 37. Typical Application
T J = P D x R θ JA + T A
Input Capacitor
To limit the voltage drop on the input supply caused by transient
inrush currents when the switch is turned on into discharged
load capacitors or a short-circuit; an input capacitor, C IN , is
recommended between IN and GND. The FPF2310/2/3/3L
features a fast current limit response time of 20 μ s. An inrush
current (also known as surge current) could occur during the
current limit response time while the switch is responding to an
over-current condition caused by large output capacitors. A
10 μ F ceramic capacitor, C IN , is required to provide charges for
the inrush current and prevent input voltage drop at the turn on.
Higher values of C IN to further reduce the voltage drop.
Output Capacitor
A 0.1 μ F to 1 μ F capacitor, C OUT , should be placed between the
OUT and GND pins. This capacitor prevents parasitic board
inductances from forcing output voltage below GND when the
switch turns off. This capacitor should have a low dissipation
factor. An X7R MLCC (Multilayer Ceramic Chip) capacitors is
recommended.
For the FPF2310 and FPF2312, 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
beyond the blanking time and shutdown. The maximum output
capacitance for a giving input voltage can be determined from
the following:
Power Dissipation
During normal operation as a switch, the power dissipation of
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:
P D_MAX(NormalOperation) = 2 x (I LIM(MIN) ) 2 x R ON(MAX) (4)
For example, for a 5V application maximum normal operation
power loss while both switches delivering output current up to
500mA (I LIM(MIN) = 500mA) can be calculated as:
P D_MAX(NormalOperation)(IN = 5V) = 2 x (0.5) 2 x 0.14 (5)
= 70mW
The maximum junction temperature should be limited to 125°C
under normal operation. Junction temperature can be
calculated using:
(6)
where:
T J is junction temperature;
P D is power dissipation across the switch
R θ JA is thermal resistance, junction-to-ambient; and T A
is ambient temperature
C OUT(MAX) =
I LIM(MIN) x t BLANK(MIN)
V IN
(2)
For example, T J(MAX)(Normal operation) for an MLP 3x3mm
package with T A =25°C while both switches are delivering up to
1.1A, is calculated as:
(3)
For example, in a 5V application and I LIM(MIN) = 500mA using
R SET = 620 ? , C OUT(MAX) can be determine as:
0.5A x 5ms
C OUT(MAX)(IN = 5V) =
5
500 μ F
=
T J(MAX)(NormalOperation)
= P D_MAX(Normal Operation)(IN = 5V) x 216 + 25
= 40.12°C
(7)
? 2009 Fairchild Semiconductor Corporation
FPF2310/12/13/13L ? Rev. 1.1.3
13
www.fairchildsemi.com
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