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| 型号： | LP2980AIM5X-5.0/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V 50MA SOT23-5 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 16V |
| 电压 - 压降（标准）： | 0.12V @ 50mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 50mA |
| 电流 - 限制（最小）： | 100mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | *LP2980AIM5X-5.0 *LP2980AIM5X-5.0/NOPB LP2980AIM5X-5.0 LP2980AIM5X-5.0-ND LP2980AIM5X-5.0/NOPBTR |
SNOS733M – APRIL 2000 – REVISED JUNE 2013
APPLICATION HINTS
OUTPUT CAPACITOR
Like any low-dropout regulator, the LP2980-N requires an output capacitor to maintain regulator loop stability.
This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series
resistance (ESR) range. It is not difficult to find capacitors which meet the criteria of the LP2980-N, as the
acceptable capacitance and ESR ranges are wider than for most other LDOs.
In general, the capacitor value must be at least 1 μ F (over the actual ambient operating temperature), and the
ESR must be within the range indicated in Figure 34 , Figure 35 and Figure 36 . It should be noted that, although
a maximum ESR is shown in these Figures, it is very unlikely to find a capacitor with ESR that high.
Tantalum Capacitors
Surface-mountable solid tantalum capacitors offer a good combination of small physical size for the capacitance
value, and ESR in the range needed by the LP2980-N.
The results of testing the LP2980-N stability with surface-mount solid tantalum capacitors show good stability
with values of at least 1 μ F. The value can be increased to 2.2 μ F (or more) for even better performance,
including transient response and noise.
Small value tantalum capacitors that have been verified as suitable for use with the LP2980-N are shown in
Aluminum Electrolytic Capacitors
Although probably not a good choice for a production design, because of relatively large physical size, an
aluminum electrolytic capacitor can be used in the design prototype for an LP2980-N regulator. A value of at
least 1 μ F should be used, and the ESR must meet the conditions of Figure 34 , Figure 35 and Figure 36 . If the
operating temperature drops below 0°C, the regulator may not remain stable, as the ESR of the aluminum
electrolytic capacitor will increase, and may exceed the limits indicated in the Figures.
Table 1. Surface-Mount Tantalum Capacitor
Selection Guide
1 μ F Surface-Mount Tantalums
Manufacturer
Kemet
NEC
Siemens
Nichicon
Sprague
Part Number
T491A105M010AS
NRU105M10
B45196-E3105-K
F931C105MA
293D105X0016A2T
2.2 μ F Surface-Mount Tantalums
Manufacturer
Kemet
NEC
Siemens
Nichicon
Sprague
Part Number
T491A225M010AS
NRU225M06
B45196/2.2/10/10
F930J225MA
293D225X0010A2T
Multilayer Ceramic Capacitors
Surface-mountable multilayer ceramic capacitors may be an attractive choice because of their relatively small
physical size and excellent RF characteristics. However, they sometimes have ESR values lower than the
minimum required by the LP2980-N, and relatively large capacitance change with temperature. The
manufacturer's datasheet for the capacitor should be consulted before selecting a value.
Test results of LP2980-N stability using multilayer ceramic capacitors show that a minimum value of 2.2 μ F is
usually needed for the 5V regulator. For the lower output voltages, or for better performance, a higher value
should be used, such as 4.7 μ F.
10
Product Folder Links: LP2980-N
Copyright ? 2000–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP2980AITP-157 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| LP2980AITP-3.3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LP2980AITP-3.3/NOPB | 功能描述:IC REG LDO 3.3V 50MA 5USMD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.1V 输入电压:最高 5.5V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA 电流 - 限制（最小）:420mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) |
| LP2980AITPX-157 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LP2980AITPX-3.3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
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