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参数资料
| 型号： | L4949 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 线性稳压 |
| 英文描述： | 100 mA, 5.0 V, Low Dropout Voltage Regulator with Power-On Reset(100mA, 5.0V，带上电复位的低压差稳压器) |
| 中文描述： | 一〇 〇毫安，5.0 V固定，低压差线性稳压器具有上电复位（100mA的和5.0V，带上电复位的低压差稳压器） |
| 文件页数： | 9/10页 |
| 文件大小： | 116K |
| 代理商： | L4949 |
L4949, NCV4949
http://onsemi.com
8
Reset Circuit
The block circuit diagram of the reset circuit is shown in
Figure 16.
The reset circuit supervises the output voltage. The reset
threshold of 4.5 V is defined with the internal reference
voltage and standby output divider.
The reset pulse delay time tRD, is defined with the charge
time of an external capacitor CT:
t
RD +
C
T
x2.0 V
2.0
mA
The reaction time of the reset circuit originates from the
discharge time limitation of the reset capacitor CT and is
proportional to the value of CT. The reaction time of the reset
circuit increases the noise immunity.
1.23 V Vref
22 k
Out
Reg
2.0
mA
CT
2.0 V
+
Reset
Figure 16. Reset Circuit
Standby output voltage drops below the reset threshold
only a bit longer than the reaction time results in a shorter
reset delay time.
The nominal reset delay time will be generated for
standby output voltage drops longer than approximately
50
ms. The typical reset output waveforms are shown in
Figure 17.
VRT + 0.1 V
5.0 V
UKT
Vout
3.0 V
Reset
Vout1
Vin
40 V
t
tR
tRD
tRR
Switch On
Input Drop
Dump
Output
Overload
Switch Off
Figure 17. Typical Reset Output Waveforms
Sense Comparator
The sense comparator compares an input signal with an
internal voltage reference of typical 1.23 V. The use of an
external voltage divider makes this comparator very flexible
in the application.
It can be used to supervise the input voltage either before
or after the protection diode and to give additional
information to the microprocessor like low voltage warnings.
ORDERING INFORMATION
Device
Operating Temperature Range
Package
Shipping
L4949N
TJ = 40°C to +125°C
PDIP8
50 Units / Rail
L4949NG
PDIP8
(PbFree)
50 Units / Rail
L4949D
SOIC8
98 Units / Rail
L4949DG
SOIC8
(PbFree)
98 Units / Rail
L4949DR2
SOIC8
2500 Units / Tape & Reel
L4949DR2G
SOIC8
(PbFree)
2500 Units / Tape & Reel
NCV4949DG*
SOIC8
(PbFree)
98 Units / Rail
NCV4949DR2*
SOIC8
2500 Units / Tape & Reel
NCV4949DR2G*
SOIC8
(PbFree)
2500 Units / Tape & Reel
NCV4949DWR2*
SOIC20W
1000 Units / Tape & Reel
NCV4949DWR2G*
SOIC20W
(PbFree)
1000 Units / Tape & Reel
For information on tape and reel specifications,including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*NCV4949: Tlow = 40°C, Thigh = +125°C. Guaranteed by design.
NCV prefix is for automotive and other applications requiring site and change control.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L4949_06 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:100 mA, 5.0 V, Low Dropout Voltage Regulator with Power−On Reset |
| L4949D | 功能描述:低压差稳压器 - LDO 5V 100mA w/Power-On 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 |
| L4949DG | 功能描述:低压差稳压器 - LDO 5V 100mA w/Power-On Reset 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 |
| L4949DG | 制造商:ON Semiconductor 功能描述:Linear Voltage Regulator IC |
| L4949DR2 | 功能描述:低压差稳压器 - LDO 5V 100mA w/Power-On 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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