MIC3975-5.0BMM Micrel Inc, MIC3975-5.0BMM Datasheet - Page 11
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MIC3975-5.0BMM
Manufacturer Part Number
MIC3975-5.0BMM
Description
IC REG LDO 750MA 5.0V 8-MSOP
Manufacturer
Micrel Inc
Datasheet
1.MIC3975-5.0YMM.pdf
(12 pages)
Specifications of MIC3975-5.0BMM
Regulator Topology
Positive Fixed
Voltage - Output
5V
Voltage - Input
Up to 16V
Voltage - Dropout (typical)
0.3V @ 750mA
Number Of Regulators
1
Current - Output
750mA (Min)
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)
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MIC3975-5.0BMM
Manufacturer:
MICREL
Quantity:
1 480
Part Number:
MIC3975-5.0BMM
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
For example, the maximum ambient temperature is 50°C,
the ΔT 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:
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 ΔT 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
February 2005
MIC3975
T
ΔT = 125°C – 50°C
ΔT = 75°C
P
P
P
P
A(max)
D
D
D
D
= (V
= (3.3V – 2.5V) × 750mA + 3.3V × 7.5mA
= 600mW + 25mW
= 625mW
= maximum ambient operating temperature
IN
– V
OUT
) I
OUT
+ V
IN
× I
GND
2
.
11
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 maxi-
mum 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
The θ
depending upon the availability of copper ground plane to
which it is attached.
JA
of this package is ideally 80°C/W, but it will vary
2
.
MIC3975
Micrel