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参数资料
| 型号： | LP2985IM5X-3.2/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 3.2 V FIXED POSITIVE LDO REGULATOR, 0.575 V DROPOUT, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 6/22页 |
| 文件大小： | 593K |
| 代理商： | LP2985IM5X-3.2/NOPB |
Turn-On Time
10014040
Turn-On Time
10014041
Turn-On Time
10014042
Application Hints
EXTERNAL CAPACITORS
Like any low-dropout regulator, the LP2985 requires external
capacitors for regulator stability. These capacitors must be
correctly selected for good performance.
Input Capacitor
An input capacitor whose capacitance is
≥ 1 F is required
between the LP2985 input and ground (the amount of capac-
itance may be increased without limit).
This capacitor must be located a distance of not more than 1
cm from the input pin and returned to a clean analog ground.
Any good quality ceramic, tantalum, or film capacitor may be
used at the input.
Important:
Tantalum capacitors can suffer catastrophic fail-
ure due to surge current when connected to a low-impedance
source of power (like a battery or very large capacitor). If a
Tantalum capacitor is used at the input, it must be guaranteed
by the manufacturer to have a surge current rating sufficient
for the application.
There are no requirements for ESR on the input capacitor, but
tolerance and temperature coefficient must be considered
when selecting the capacitor to ensure the capacitance will
be
≥ 1 F over the entire operating temperature range.
Output Capacitor
The LP2985 is designed specifically to work with ceramic out-
put capacitors, utilizing circuitry which allows the regulator to
be stable across the entire range of output current with an
output capacitor whose ESR is as low as 5 m
Ω. It may also
be possible to use Tantalum or film capacitors at the output,
but these are not as attractive for reasons of size and cost
(see next section Capacitor Characteristics).
The output capacitor must meet the requirement for minimum
amount of capacitance and also have an ESR (equivalent se-
ries resistance) value which is within the stable range. Curves
are provided which show the stable ESR range as a function
of load current (see ESR graph below).
www.national.com
14
LP2985
相关PDF资料 |
PDF描述 |
|---|---|
| LP2985IM5X-3.5/NOPB | 3.5 V FIXED POSITIVE LDO REGULATOR, 0.575 V DROPOUT, PDSO5 |
| LP2985IM5X-4.7/NOPB | 4.7 V FIXED POSITIVE LDO REGULATOR, 0.575 V DROPOUT, PDSO5 |
| LP2985IM5X-4.8/NOPB | 4.8 V FIXED POSITIVE LDO REGULATOR, 0.575 V DROPOUT, PDSO5 |
| LP2985IM5X-5.3/NOPB | 5.3 V FIXED POSITIVE LDO REGULATOR, 0.575 V DROPOUT, PDSO5 |
| LP3883ET-1.2/NOPB | 1.216 V FIXED POSITIVE LDO REGULATOR, 0.42 V DROPOUT, PZFM5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LP2985IM5X33NOPB | 制造商:Texas Instruments 功能描述: |
| LP2985IM5X-4.0 | 功能描述:低压差稳压器 - 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 |
| LP2985IM5X-4.0 NOPB | 制造商:National Semiconductor 功能描述:LDO Regulator Pos 4V 0.15A 5-Pin SOT-23 T/R |
| LP2985IM5X-4.0/NOPB | 功能描述:低压差稳压器 - 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 |
| LP2985IM5X-4.5 | 功能描述:低压差稳压器 - 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 |
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