MIC5314-F4YMT TR Micrel Inc, MIC5314-F4YMT TR Datasheet - Page 11

• Manufacturer Part Number: MIC5314-F4YMT TR
• Description: Low Vin/Vout Dual 300mA LDO With POR In 2.5mm X 2.5mm TMLFr
• Manufacturer: Micrel Inc

Specifications of MIC5314-F4YMT TR

• Regulator Topology: Positive Fixed
• Voltage - Output: 1.5V, 1.2V
• Voltage - Input: 1.7 ~ 5.5 V
• Voltage - Dropout (typical): 0.085V @ 300mA
• Number Of Regulators: 2
• Current - Output: 300mA
• Current - Limit (min): 350mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 12-TMLF®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-3134-2

be determined using the equation:
P
Because this device is CMOS and the ground current is
typically <100µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
P
To
temperature of the package, use the junction-to-ambient
thermal resistance of the device and the following basic
equation:
T
the die. The junction-to-ambient thermal resistance for
the minimum footprint, is θ
Micrel, Inc.
July 2008
J(max)
D
D
= (V
= (1.8V – 1.5V) × 300mA + (1.8V – 1.0V) × 300mA
determine
= 125°C, the maximum junction temperature of
IN
P
P
– V
D
D(MAX)
= 0.33W
OUT1
=
) I
the
⎛
⎜
⎜
⎝
OUT1
T
J(MAX)
+ (V
θ
maximum
JA
JA
−
IN
T
= 70°C/W.
– V
A
⎞
⎟
⎟
⎠
OUT2
ambient
) I
OUT2
+ V
BIAS
operating
I
GND
11
Substituting P
operating temperature will give the maximum operating
conditions for the regulator circuit.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5314-FCYMT at
an input voltage of 1.8V and 300mA, loads at each
output with a minimum footprint layout, the maximum
ambient operating temperature T
follows:
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
0.33W = (125°C – T
T
A
= 101.9°C
D
for P
D(max)
and solving for the ambient
A
)/(70°C/W)
A
can be determined as
M9999-070208-A
MIC5314