参数资料
| 型号： | SIP4612ADVP-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 4/10页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SW HISIDE 1A SC75-6 |
| 标准包装： | 3,000 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 250 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 1A |
| 输入电压： | 2.4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | PowerPAK? TSC-75-6 |
| 供应商设备封装： | PowerPAK? TSC75-6 |
| 包装： | 带卷 (TR) |
SiP4612A/B
Vishay Siliconix
DETAILED DESCRIPTION
The SiP4612A/B limits load current by sampling the pass
transistor current and passing that through an external
resistor, R SET . The voltage across R SET , V SET , is then
compared with an internal reference voltage, V REF . In the
event that load current surpasses the set limit current, V SET
will exceed V REF causing the pass transistor gate voltage to
increase, thereby reducing the gate to source voltage of the
PMOS switch and regulating its current back down to I LIMIT .
Setting the Current Limit Level
Setting the current limit level on the SiP4612A/B requires
some care to ensure the maximum current required by the
load will not trigger the current limit circuitry. The minimum
current limit threshold should be determined by taking the
maximum current required by the load, I LOAD , and adding
25 % headroom. The SiP4612A/B has a current limit
tolerance of 25 %, which is largely a result of process
variations from part to part, and also temperature and
V IN /V OUT variances. Thus, to ensure that the actual current
increase in V IN - V OUT will cause the chip to dissipate more
heat. The power dissipation for the SiP4612A/B can be
expressed as
P = I LOAD x (V IN - V OUT )
Once this exceeds the maximum power dissipation of the
package, the die temperature will rise. When the die
temperature exceeds an over-temperature limit of 165 °C,
the SiP4612A/B will shut down until it has cooled down to
145 °C, before starting up again. As can be seen in the figure
below, the SiP4612A/B will continue to cycle on and off until
the load is reduced or the part is turned off (See Figure 2).
The maximum power dissipation in any application is
dependant on the maximum junction temperature,
T J(MAX) = 125 °C, the junction-to-ambient thermal resistance
for the TSC75-6 package, θ J-A = 131 °C/W, and the ambient
temperature, T A , which may be formulaically expressed as:
limit is never below the desired current limit a 1/0.75 = 1.33
coefficient needs to be added to the calculations. Knowing
the maximum load current required, the value of R SET is
P (max) =
T J (max) ? T A
θ J ? A
=
125 ? T A
131
calculated as follows.
It then follows that assuming an ambient temperature of
R SET = R SET coefficient/I LIMIT
where I LIMIT = (I LOAD x 1.33) x 1.25 and R SET coefficient is
3460 for a 500 mA current limit. For typical R SET coefficient
values given a limit current refer to the "Typical
Characteristics" section.
Operation at Current Limit and Thermal Shutdown
In the event that a load higher than I LIMIT is demanded of the
SiP4612A/B, the load current will stay fixed at the current
limit established by R SET . However, since the required
current is not supplied, the voltage at OUT will drop. The
70 °C, the maximum power dissipation will be limited to about
419 mW.
Reverse Voltage
The SiP4612A/B is designed to control current flowing from
IN to OUT. If the voltage on OUT is raised higher than IN
current will flow from OUT to IN but the current limit function
will not be available, as can be inferred from the block
diagram in Figure 1. Thus, in applications were OUT is used
to charge IN, careful considerations must be taken to limit
current through the device and protect it from becoming
damaged.
R SET = 3.32 k Ω
V OUT = (1 V/div )
I OUT (500 mA/div)
20 ms/div
Figure 2. Current Over load Condition. Load Switch turned on with 0.1 Ω load at time = 0 ms.
www.vishay.com
4
Document Number: 74481
S-80971-Rev. B, 24-Apr-08
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SIP4612BDVP-T1-E3 | 功能描述:电源开关 IC - 配电 1A PROTECTED HIGH SIDE 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 |
| SIP4613A | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:Protected 1-A High-Side Load Switch |
| SIP4613ADVP-T1-E3 | 功能描述:电源开关 IC - 配电 Protected 1.0 Amp High-Side Load 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 |
| SIP4613B | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:Protected 1-A High-Side Load Switch |
| SIP4613BDVP-T1-E3 | 功能描述:电源开关 IC - 配电 Protected 1.0 Amp High-Side Load 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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