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参数资料
| 型号： | LP2980LV |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | Micropower SOT, 50 mA Low-Voltage Low-Dropout Regulator For Applications With Output Voltages < 2V |
| 中文描述： | 微采用SOT，50毫安低电压低差对于输出电压调节器的应用“2V的 |
| 文件页数： | 13/18页 |
| 文件大小： | 423K |
| 代理商： | LP2980LV |
Application Hints
(Continued)
REVERSE CURRENT PATH
The power transistor used in the LP2980 has an inherent di-
ode connected between the regulator input and output (see
below).
If the output is forced above the input by more than a V
,
this diode will become forward biased and current will flow
from the V
terminal to V
. No damage to the LP2980 will
occur under these conditions as long as the current flowing
into the output pin does not exceed 100 mA.
ON/OFF INPUT OPERATION
The LP2980 is shut off by pulling the ON/OFF input low, and
turned on by driving the input high. If this feature is not to be
used, the ON/OFF input should be tied to V
to keep the
regulator on at all times (the ON/OFF input must
not
be left
floating).
To ensure proper operation, the signal source used to drive
the ON/OFF input must be able to swing above and below
the specified turn-on/turn-off voltage thresholds which guar-
antee an ON or OFF state (see Electrical Characteristics).
The ON/OFF signal may come from either a totem-pole out-
put, or an open-collector output with pull-up resistor to the
LP2980 input voltage or another logic supply. The high-level
voltage may exceed the LP2980 input voltage, but must re-
main within the Absolute Maximum Ratings for the ON/OFF
pin.
It is also important that the turn-on/turn-off voltage signals
applied to the ON/OFF input have a slew rate which is
greater than 40 mV/μs.
Important: the regulator shutdown function will operate incor-
rectly if a slow-moving signal is applied to the ON/OFF input.
Micro SMD Mounting
The micro SMD package requires specific mounting tech-
niques which are detailed in National Semiconductor Appli-
cation Note
#
1112. Referring to the section
Surface Mount
Technology (SMT) Assembly Considerations
, it should be
noted that the pad style which must be used with the 5-pin
package is the NSMD (non-solder mask defined) type.
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
Micro SMD Light Sensitivity
Exposing the micro SMD device to direct sunlight will cause
misoperation of the device. Light sources such as Halogen
lamps can also affect electrical performance if brought near
to the device.
The wavelenghts which have the most detrimental effect are
reds and infra-reds, which means that the fluorescent light-
ing used inside most buildings has very little effect on perfor-
mance. A micro SMD test board was brought to within 1 cm
of a fluorescent desk lamp and the effect on the regulated
output voltage was negligible, showing a deviation of less
than 0.1% from nominal.
DS012078-50
FIGURE 3. 10 μF ESR Range
DS012078-34
FIGURE 4. LP2980 Reverse Current Path
L
www.national.com
13
相关PDF资料 |
PDF描述 |
|---|---|
| LP2981 | 100-MA ULTRA DROPOUT REGULATOR WITH SHUTDOWN |
| LP2981AIBP-3.2 | Micropower 100 mA Ultra Low-Dropout Regulator |
| LP2981AIBP-3.3 | Micropower 100 mA Ultra Low-Dropout Regulator |
| LP2981AIBPX-2.5 | Micropower 100 mA Ultra Low-Dropout Regulator |
| LP2981AIBPX-3.2 | Micropower 100 mA Ultra Low-Dropout Regulator |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LP2981-2.5BUP6 WAF | 制造商:Texas Instruments 功能描述: |
| LP2981-28DBVR | 功能描述:低压差稳压器 - LDO 100-mA 1.25% Tolerance 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 |
| LP2981-28DBVRE4 | 功能描述:低压差稳压器 - LDO 100-mA 1.25% Tolerance 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 |
| LP2981-28DBVRG4 | 功能描述:低压差稳压器 - LDO Sgl Output 100mA Fixed(2.8V) Shutdown 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 |
| LP2981-28DBVT | 功能描述:低压差稳压器 - LDO 100-mA 1.25% Tolerance 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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