参数资料
型号: MIC2951-3.3BM
厂商: Micrel Inc
文件页数: 12/20页
文件大小: 0K
描述: IC REG LDO 3.3V/ADJ .15A 8SOIC
标准包装: 95
稳压器拓扑结构: 正,固定式或可调式
输出电压: 3.3V,1.24 V ~ 29 V
输入电压: 2 V ~ 30 V
电压 - 压降(标准): 0.32V @ 150mA
稳压器数量: 1
电流 - 输出: 150mA
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 管件
Micrel, Inc.
Reducing Output Noise
In some applications it may be advantageous to reduce
the AC noise present at the output. One method is to
reduce the regulator bandwidth by increasing the size of
the output capacitor. This is the only method by which
noise can be reduced on the 3 lead MIC2950 and is
relatively inef ? cient, as increasing the capacitor from 1μF
to 220μF only decreases the noise from 430μV to 160μV
rms for a 100kHz bandwidth at 5V output.
Noise can be reduced fourfold by a bypass capacitor
across R 1 , since it reduces the high frequency gain from 4
to unity. Pick:
MIC2950/2951
C BYPASS ?
1
2 π R 1 ? 200Hz
or about 0.01μF. When doing this, the output capacitor
Figure 1. ERROR Output Timing
must be increased to 3.3μF to maintain stability. These
changes reduce the output noise from 430μV to
100μVrms for a100kHz bandwidth at 5V output. With the
bypass capacitor added, noise no longer scales with
output voltage so that improvements are more dramatic at
higher output voltages.
Figure 2. Adjustable Regulator
February 2010
12
M9999-021610
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