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参数资料
| 型号： | MAX4766CETA+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 0.075A to 1.5A, Programmable Current-Limit Switch |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 3 X 3 MM, 0.80 MM HEIGHT, MO-229WEEC, TINY, TDFN-8 |
| 文件页数： | 2/12页 |
| 文件大小： | 326K |
| 代理商： | MAX4766CETA+ |
MAX4766
0.075A to 1.5A, Programmable
Current-Limit Switch
10
______________________________________________________________________________________
Applications Information
Setting the Current Limit
A resistor from SETI to ground programs the current-
limit value for the MAX4766. Table 2 lists various cur-
rent limits set by different resistor values. Use the
following formula to calculate the current limit:
Input Capacitor
Connect a capacitor from IN to ground to limit the input
voltage drop during momentary output short-circuit con-
ditions. A 2.2F ceramic capacitor with less than 0.2
ESR is adequate for most applications. Higher capacitor
values further reduce the voltage drop at the input.
Output Capacitor
For stable operation over the full temperature range
and over the full-programmable current-limit range,
use a 2.2F capacitor with less than 0.2
ESR from
OUT to ground.
If the load capacitance is too large, then current may
not have enough time to charge the capacitance and
the device assumes that there is a faulty load condition.
The maximum capacitive load value that can be driven
from OUT is obtained by the following formula:
Layout and Thermal Dissipation
To optimize the switch response time to output short-
circuit conditions, it is very important to keep all traces
as short as possible to reduce the effect of undesirable
parasitic inductance. Place input and output capacitors
as close as possible to the device (no more than 5mm).
IN and OUT pins must be connected with short traces
to the power bus. During normal operation, the power
dissipation is small and the package temperature
change is minimal. If the output is continuously shorted
to ground at the maximum supply voltage, the opera-
tion of the switches with the autoretry option does not
cause problems because the total power dissipated
during the short is scaled by the duty cycle:
Attention must be given to the latch-off version of the
MAX4766 where the latch-off condition must be manu-
ally reset by toggling ON from high to low. If the latch-
off time duration is not sufficiently high, it is possible for
the device to reach the thermal shutdown threshold and
never be able to turn the device on until it cools down.
PMAX
VI
t
tt
IN MAX
OUT MAX
BLANK
RETRY
BLANK
=
××
+
__
CMAX
It
V
FWD MIN
BLANK
IN
=
×
_
RSETI
kV
I
k
LIM A
=
112 5
.
()
RSETI (k
)
TYPICAL CURRENT LIMIT (A)
1500
0.075
1125
0.1
750
0.15
562.5
0.2
330
0.375
200.9
0.56
150
0.75
112.5
1.0
90
1.25
80.35
1.4
≤75
1.5
Table 2. Current Limit vs. Resistor Values
Chip Information
TRANSISTOR COUNT: 1544
PROCESS: CMOS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4766CETA+ | 制造商:Maxim Integrated Products 功能描述:CURRENT LIMIT SW 1-IN 1-OUT 2.25V TO 4.5V 640A 8TDFN EP - Rail/Tube |
| MAX4766CETA+T | 功能描述:电源开关 IC - 配电 75mA-1.5A Prog Current-Limit 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 |
| MAX4766CETA-T | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LIMIT SWITCH - Tape and Reel |
| MAX4772ETT+T | 功能描述:电源开关 IC - 配电 200mA/500mA Select Current-Limit 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 |
| MAX4772ETT-T | 功能描述:电源开关 IC - 配电 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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