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参数资料
| 型号： | SPX3819M5-L |
| 英文描述： | 500mA, Low-Noise LDO Voltage Regulator |
| 中文描述： | 500mA的，低噪声LDO稳压器 |
| 文件页数： | 7/13页 |
| 文件大小： | 380K |
| 代理商： | SPX3819M5-L |
7
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
2007 Sipex Corporation
The SPX3819 requires an output capacitor for
device stability. Its value depends upon the
application circuit. In general, linear regulator
stability decreases with higher output currents.
In applications where the SPX3819 is sourcing
less current, a lower output capacitance may be
sufficient. For example, a regulator outputting
only 10mA, requires approximately half the
capacitance as the same regulator sourcing
150mA.
Bench testing is the best method for determining
the proper type and value of the capacitor since
the high frequency characteristics of electro-
lytic capacitors vary widely, depending on type
and manufacturer. A high quality 2.2
μ
F alumi-
num electrolytic capacitor works in most appli-
cation circuits, but the same stability often can
be obtained with a 1
μ
F tantalum electrolytic.
With the SPX3819 adjustable version, the mini-
mum value of output capacitance is a function of
the output voltage. The value decreases with
higher output voltages, since closed loop gain is
increased.
Typical Applications Circuits
A 10nF capacitor on the BYP pin will signifi-
cantly reduce output noise, but it may be left
unconnected if the output noise is not a major
concern. The SPX3819 start-up speed is in-
versely proportional to the size of the BYP
capacitor. Applications requiring a slow ramp-
up of the output voltage should use a larger
C
BYP
. However, if a rapid turn-on is necessary,
the BYP capacitor can be omitted.
The SPX3819’s internal reference is available
through the BYP pin.
Figure 1
represents a SPX3819 standard appli-
cation circuit. The EN (enable) pin is pulled
high (>2.0V) to enable the regulator.
To disable the regulator, EN < 0.4V.
The SPX3819 in
Figure 2
illustrates a typical
adjustable output voltage configuration. Two
resistors (R
1
and R
2
) set the output voltage. The
output voltage is calculated using the formula:
V
OUT
= 1.235V x
[
1 + R
1
/R
2
]
R
2
must be > 10 k
and for best results, R
2
should be between 22 k
and 47k
.
APPLICATION INFORMATION
+
+
GND
EN
(BYP
ENABLE may be tied directly to V
IN
SPX3819
1
2
3
4
5
V
IN
V
OUT
TOP View
+
+
GND
EN
Hi-ON
SPX3819
SOT-23
1
2
3
4
5
V
IN
V
OUT
R1
R2
TOP View
Figure 1. Standard Application Circuit
Figure 2. Typical Adjustable Output Voltage Configuration
相关PDF资料 |
PDF描述 |
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| SPX3819M5-L-1-2 | 500mA, Low-Noise LDO Voltage Regulator |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SPX3819M5-L | 制造商:Exar Corporation 功能描述:Regulator |
| SPX3819M5-L/TR | 功能描述:低压差稳压器 - LDO 500mA LOW NOISE 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 |
| SPX3819M5-L-1-2 | 功能描述:低压差稳压器 - LDO 500mA Low Noise LDO Voltage Regulator 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 |
| SPX3819M5-L-1-2/TR | 功能描述:低压差稳压器 - LDO 500mA LOW NOISE 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 |
| SPX3819M5-L-1-5 | 功能描述:低压差稳压器 - LDO 500mA Low Noise LDO Voltage Regulator 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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