MIC5216-3.3BM5TR Micrel, MIC5216-3.3BM5TR Datasheet - Page 11

• Manufacturer Part Number: MIC5216-3.3BM5TR
• Description: ic reg ldo 500ma 1% 3.3v sot23-5... ic reg ldo 3.3v .5a sot23-5...
• Manufacturer: Micrel

The total power dissipation of the device under these
conditions is the sum of the two power dissipation
figures.
The total power dissipation of the regulator is less than
the maximum power dissipation of the SOT-23-5
package at room temperature, on a minimum footprint
board and therefore would operate properly.
Multilayer boards with a ground plane, wide traces near
the pads, and large supply-bus lines will have better
thermal conductivity.
For additional heat sink characteristics, please refer to
Micrel Application Hint 17, “Designing P.C. Board Heat
Sinks”, included in Micrel’s Databook. For a full
discussion of heat sinking and thermal effects on voltage
regulators, refer to Regulator Thermals section of
Micrel’s Designing with Low-Dropout Voltage Regulators
handbook.
Micrel, Inc.
March 2007
P
P
P
D(total)
D(total)
D(total)
a. 25
a. 25
= P
= 151mW + 119mW
= 270mW
D
°
°
C Ambient
C Ambient
× 50mA + P
Figure 3. MIC5216-x.xBMM (MSOP-8) on Minimum Recommended Footprint
Figure 4. MIC5216-x.xBMM (MSOP-8) on on 1-inch
D
× 500mA
b. 50
b. 50
°
°
C Ambient
C Ambient
11
Fixed Regulator Circuits
Figure 5 shows a basic MIC5216-x.xBMx fixed-voltage
regulator circuit. A 1µF minimum output capacitor is
required for basic fixed-voltage applications.
The flag output is an open-collector output and requires
a pull-up resistor to the input voltage. The flag indicates
an undervoltage condition on the output of the device.
Figure 5. Low-Noise Fixed Voltage Regulator
V
IN
2
Copper Cladding
100k
IN
EN
MIC5216
GND
c. 85
c. 85
OUT
FLG
°
°
C Ambient
C Ambient
1µF
V
M9999-032307
OUT
MIC5216