MIC3775-1.5BMM Micrel Inc, MIC3775-1.5BMM Datasheet - Page 12

• Manufacturer Part Number: MIC3775-1.5BMM
• Description: IC REG LDO 750MA 1.5V 8-MSOP
• Manufacturer: Micrel Inc

Specifications of MIC3775-1.5BMM

• Regulator Topology: Positive Fixed
• Voltage - Output: 1.5V
• Voltage - Input: 2.25 ~ 6 V
• Voltage - Dropout (typical): 0.28V @ 750mA
• Number Of Regulators: 1
• Current - Output: 750mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Limit (min): -

For example, the maximum ambient temperature is
50°C, the ∆T is determined as follows:
Using Figure 4, the minimum amount of required copper
can be determined based on the required power
dissipation. Power dissipation in a linear regulator is
calculated as follows:
Micrel, Inc.
December 2006
∆T = T
T
T
temperature
∆T = 125°C – 50°C
∆T = 75°C
Figure 5. Copper Area vs. Power-MSOP
J(max)
A(max)
= 125°C
J(max)
Power Dissipation (T
=
– T
maximum
A(max)
ambient
A
)
operating
12
If we use a 2.5V output device and a 3.3V input at an
output current of 750mA, then our power dissipation is
as follows:
From Figure 4, the minimum amount of copper required
to operate this application at a ∆T of 75°C is 160mm
Quick Method
Determine the power dissipation requirements for the
design along with the maximum ambient temperature at
which the device will be operated. Refer to Figure 5,
which shows safe operating curves for three different
ambient temperatures: 25°C, 50°C and 85°C. From
these curves, the minimum amount of copper can be
determined by knowing the maximum power dissipation
required. If the maximum ambient temperature is 50°C
and the power dissipation is as above, 625mW, the
curve in Figure 5 shows that the required area of copper
is 160mm
it will vary depending upon the availability of copper
ground plane to which it is attached.
P
P
P
P
D
D
D
D
2
.The θ
= (V
= (3.3V – 2.5V) × 750mA + 3.3V × 7.5mA
= 600mW + 25mW
= 625mW
IN
JA
– V
of this package is ideally 80°C/W, but
OUT
) I
OUT
+ V
IN
×I
GND
M9999-121906
MIC3775
2
.