MIC5206-2.5BM5 MICREL [Micrel Semiconductor], MIC5206-2.5BM5 Datasheet - Page 7

• Manufacturer Part Number: MIC5206-2.5BM5
• Description: 150mA Low-Noise LDO Regulator
• Manufacturer: MICREL [Micrel Semiconductor]

MIC5206
Resistor values are not critical because ADJ (adjust) has a
high input impedance, but for best results use resistors of
470k
greatly improved noise performance.
Figure 3 also includes a 470pF capacitor for lowest-noise
operation and shows EN (pin 7) connected to IN (pin 8) for an
application where enable/shutdown is not required. C
2.2 F minimum. The error flag is shown with a 47k pullup
resistor.
Thermal Considerations
Layout
The MIC5206-x.xBM5 (5-lead SOT-23 package) has the
following thermal characteristics when mounted on a single
layer copper-clad printed circuit board.
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
January 2000
Flag Output
(optional)
or less. A capacitor from ADJ to ground provides
V
OUT
Adjustable Voltage Application
Figure 3. Ultra-Low-Noise
2.2µF
R1
R2
1
2
3
4
MIC5206BMM
47k
ADJ
8
7
6
5
C
470pF
BYP
V
OUT
IN
=
7
The “worst case” value of 220 C/W assumes no ground
plane, minimum trace widths, and a FR4 material board.
The MIC5206-xxBMM (8-lead MSOP) has a thermal resis-
tance of 200 C/W when mounted on a FR4 board with
minimum trace widths and no ground plane.
Nominal Power Dissipation and Die Temperature
The MIC5206-x.xBM5 at a 25 C ambient temperature will
operate reliably at over 450mW power dissipation when
mounted in the “worst case” manner described above. At an
ambient temperature of 40 C, the device may safely dissi-
pate over 380mW. These power levels are equivalent to a die
temperature of 125 C, the maximum operating junction tem-
perature for the MIC5206.
For additional heat sink characteristics, please refer to Micrel
Application Hint 17, “Calculating P.C. Board Heat Sink Area
For Surface Mount Packages”.
SOT-23-5 Thermal Characteristics
MSOP Thermal Characteristics
PC Board
Dielectric
PC Board
Dielectric
Ceramic
FR4
FR4
220 C/W
200 C/W
200 C
JA
JA
MIC5206
Micrel