MIC5311-NNYML TR Micrel Inc, MIC5311-NNYML TR Datasheet - Page 10

• Manufacturer Part Number: MIC5311-NNYML TR
• Description: Portable Power IC In 3mm X 3mm MLFr LowQT Dual Cap LDOT ( )
• Manufacturer: Micrel Inc

Specifications of MIC5311-NNYML TR

• Regulator Topology: Positive Fixed
• Voltage - Output: 2.85V
• Voltage - Input: 2.5 ~ 5.5 V
• Voltage - Dropout (typical): 0.12V @ 300mA
• Number Of Regulators: 2
• Current - Output: 300mA
• Current - Limit (min): 350mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-MLF®, QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MIC5311-NNYMLTR; MIC5311-NNYMLTR

March 2006
Micrel, Inc.
The calculation shows that we are well below the
maximum allowable power dissipation of 1.03W for a
60° ambient temperature.
After the maximum power dissipation has been
calculated, it is always a good idea to calculate the
maximum ambient temperature for a 125° junction
temperature. Calculating maximum ambient temperature
as follows:
P
P
P
DTOTAL
DTOTAL
DTOTAL
= P
= 360mW + 140mW
= 500mW
D LDO1
+ P
D LDO2
10
For a full discussion of heat sinking and thermal effects
on voltage regulators, refer to the “Regulator Thermals”
section of Micrel’s Designing with Low-Dropout Voltage
Regulators handbook.
This information can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
T
T
T
A(max)
A(max)
A(max)
= T
= 125°C – (500mW x 63°C/W)
= 93.5°C
J(max)
– (P
D
x θ
JA
)
[phone]
M9999-032706
MIC5311