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| 型号： | NCP691MN25T2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V 1A 6-DFN |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 0.19V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A |
| 电流 - 限制（最小）： | 1.1A |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-VDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN（3x3） |
| 包装： | 带卷 (TR) |
NCP690, NCP691, NCP692, NCV8690
divider network as shown on Figure 4. The output voltage
and resistors should be chosen using Equations 1 and 2.
The power dissipated by the NCP690 can be calculated
from the following equations:
V OUT + 1.250 1 )
R 1
R 2
) (I ADJ @ R 1 )
(eq. 1)
or
P D [ V IN (I GND @I OUT ) ) I OUT (V IN * V OUT )
(eq. 4)
R 2 ^ R 1
1
V OUT
1.25
* 1
(eq. 2)
V IN(MAX) [
P D(MAX) ) (V OUT
I OUT ) I GND
I OUT )
(eq. 5)
Input bias current I ADJ is typically less than 210 nA.
Choose R 1 arbitrarily to minimize errors due to the bias
current and to minimize noise contribution to the output
voltage. Use Equation 2 to find the required value for R 2 . If
an output voltage of 1.25 V is desired, the adjustable pin
250
200
should be connected directly to the output pin.
Thermal Characteristics
As power dissipated in the NCP690 increases, it might
become necessary to provide some thermal relief. The
maximum power dissipation supported by the device is
dependent upon board design and layout. Mounting pad
configuration on the PCB, the board material, and the
150
100
50
FR4 ? 1.0 oz
FR4 ? 2.0 oz
ambient temperature affect the rate of junction temperature
rise for the part. When the NCP690 has good thermal
conductivity through the PCB, the junction temperature will
be relatively low with high power applications. The
0
0 200 400 600
COPPER AREA (mm 2 )
Figure 32. Thermal Resistance vs. Copper Area
800
R q JA
maximum dissipation the NCP690 can handle is given by:
[T J(MAX) * T A ]
P D(MAX) + (eq. 3)
Since T J is not recommended to exceed 125 ° C (T J(MAX) ),
then the NCP690 can dissipate up to 1 W when the ambient
temperature (T A ) is 25 ° C.
Hints
V IN and GND printed circuit board traces should be as
wide as possible. When the impedance of these traces is
high, there is a chance to pick up noise or cause the regulator
to malfunction. Place external components, especially the
output capacitor, as close as possible to the NCP690, and
make traces as short as possible.
http://onsemi.com
12
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相关代理商/技术参数 |
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| NCP691MN33T2G | 功能描述:低压差稳压器 - LDO LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCP691MN50T2G | 功能描述:低压差稳压器 - LDO LDO DEVICE RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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