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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： | 8/10页 |
| 文件大小： | 116K |
| 代理商： | L4949 |
L4949, NCV4949
http://onsemi.com
7
OPERATING DESCRIPTION
The L4949 is a monolithic integrated low dropout voltage
regulator. Several outstanding features and auxiliary
functions are implemented to meet the requirements of
supplying
microprocessor
systems
in
automotive
applications. Nevertheless, it is suitable also in other
applications where the present functions are required. The
modular approach of this device allows the use of other
features and functions independently when required.
Voltage Regulator
The voltage regulator uses an isolated Collector Vertical
PNP transistor as a regulating element. With this structure,
very low dropout voltage at currents up to 100 mA is
obtained. The dropout operation of the standby regulator is
maintained down to 3.0 V input supply voltage. The output
voltage is regulated up to the transient input supply voltage
of 35 V. With this feature no functional interruption due to
overvoltage pulses is generated.
The typical curve showing the standby output voltage as
a function of the input supply voltage is shown in Figure 14.
The current consumption of the device (quiescent current)
is less than 200
mA.
To reduce the quiescent current peak in the undervoltage
region and to improve the transient response in this region,
the dropout voltage is controlled. The quiescent current as
a function of the supply input voltage is shown in Figure 15.
Short Circuit Protection:
The maximum output current is internally limited. In case
of short circuit, the output current is foldback current limited
as described in Figure 13.
0
5.0
20
100
200
Iout (mA)
Figure 13. Foldback Characteristic of Vout
V
out
(V)
10
Vout
5.0 V
35 V
5.0 V
2.0 V
0 V
Vout
VCC
Figure 14. Output Voltage versus Supply Voltage
3.0
Figure 15. Quiescent Current versus Supply Voltage
2.5
2.0
1.5
1.0
0
5.0
10
15
20
25
30
VCC, SUPPLY VOLTAGE (V)
0.5
0
RL = 5.0 k
RL = 100 W
TJ = 25°C
I Q
,QUIESCENT
CURRENT
(mA)
Preregulator
To improve the transient immunity a preregulator
stabilizes the internal supply voltage to 6.0 V. This internal
voltage is present at Pin 3 (VZ). This voltage should not be
used as an output because the output capability is very small
(
≤ 100 mA).
This output may be used as an option when better transient
behavior for supply voltages less than 8.0 V is required. In
this case a capacitor (100 nF 1.0
mF) must be connected
between Pin 3 and GND. If this feature is not used Pin 3 must
be left open.
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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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