MIC2951-3.3YM Micrel Inc, MIC2951-3.3YM Datasheet - Page 12
![IC REG LDO 150MA 3.3V 8SOIC](/photos/6/50/65078/576-8-soic_sml.jpg)
MIC2951-3.3YM
Manufacturer Part Number
MIC2951-3.3YM
Description
IC REG LDO 150MA 3.3V 8SOIC
Manufacturer
Micrel Inc
Datasheet
1.MIC2951-03YM_TR.pdf
(20 pages)
Specifications of MIC2951-3.3YM
Regulator Topology
Positive Fixed or Adjustable
Voltage - Output
3.3V, 1.24 ~ 29 V
Voltage - Input
2 ~ 30 V
Voltage - Dropout (typical)
0.32V @ 150mA
Number Of Regulators
1
Current - Output
150mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
576-1151
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MIC2951-3.3YM
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
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 inefficient, 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
to unity. Pick:
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.
Micrel, Inc.
February 2010
C
1
, since it reduces the high frequency gain from 4
BYPASS
≅
2
π
R
1
•
1
200Hz
12
Figure 1. ERROR Output Timing
Figure 2. Adjustable Regulator
MIC2950/2951
M9999-021610