LP2951-02 데이터 시트보기 (PDF) - Micrel

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LP2951-02

100mA Low-Dropout Voltage Regulator

Micrel 

Micrel, Inc.

Noise can be reduced fourfold by a bypass capacitor

across R1, since it reduces the high frequency gain from

4 to unity. Pick:

CBYPASS

≅

1

2πR1 • 200Hz

or about 0.01µF. When doing this, the output capacitor

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.

LP2950/2951

Figure 1. ERROR Output Timing

Figure 2. Adjustable Regulator

September 2008

10

M9999-091208

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