MIC5259-2.5YML TR Micrel Inc, MIC5259-2.5YML TR Datasheet - Page 9

• Manufacturer Part Number: MIC5259-2.5YML TR
• Description: IC,VOLT REGULATOR,FIXED,+2.5V,CMOS,LLCC,6PIN,PLASTIC
• Manufacturer: Micrel Inc

Specifications of MIC5259-2.5YML TR

• Regulator Topology: Positive Fixed
• Voltage - Output: 2.5V
• Voltage - Input: Up to 6V
• Voltage - Dropout (typical): 0.3V @ 300mA
• Number Of Regulators: 1
• Current - Output: 300mA
• Current - Limit (min): 350mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 6-MLF®, QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-2831-2; MIC5259-2.5YML TR; MIC5259-2.5YMLTR; MIC5259-2.5YMLTR

The actual power dissipation of the regulator circuit can
be determined using the equation:
Substituting P
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5259-2.8BML at
70°C with a minimum footprint layout, the maximum
input voltage for a set output current can be determined
as follows:
Micrel, Inc.
September 2006
P
P
P
D
D(max)
D(max)
= (V
D(max)
= 611mW
IN
=
– V
⎛
⎜
⎝
125
for P
OUT
90
°
C
) I
°
D
C/W
−
OUT
and solving for the operating
70
+ V
°
C
⎞
⎟
⎠
IN
I
GND
9
The junction-to-ambient thermal resistance for the
minimum footprint is 90°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using the output voltage of 2.8V and
an output current of 200mA, the maximum input voltage
can be determined. Because this device is CMOS and
the ground current is typically 110µA over the load
range, the power dissipation contributed by the ground
current is < 1% and can be ignored for this calculation.
Therefore, a 2.8V application at 200mA of output current
can accept a maximum input voltage of 5.85V in an MLF
package. 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.
611mW = (V
611mW = V
1171mW = V
V
IN(max)
= 5.85V
IN
IN
IN
× 200mA – 560mW
– 2.8V) 200mA
× 200mA
M9999-091406
MIC5259