mic47300 Micrel Semiconductor, mic47300 Datasheet - Page 8

• Manufacturer Part Number: mic47300
• Description: 3a, Low Voltage, Adjustable Ldo Regulator With Dual Input Supply
• Manufacturer: Micrel Semiconductor

capacitor of at least 1µF is needed directly between the
input and regulator ground. Refer to “Application Note 9”
for further details and examples on thermal design and
heat sink specification.
The maximum power allowed can be calculated using
the thermal resistance (θ
following criteria for the PCB design: 2 oz. copper and
100mm
maximum ambient temperature (T
the use of a heat sink, the maximum power allowed that
Micrel, Inc.
October 2009
2
copper area for the MIC47300. Given a
JA
) of the D-Pak adhering to the
A
=75°C), and without
8
would
temperature (125°C) is
P
Minimum Load Current
The MIC47300, unlike most other high current
regulators, does not require a minimum load to maintain
output voltage regulation.
D(MAX)
= (T
= 0.893W
not
J(MAX)
exceed
– T
A
)/θ
JA
the
= (125°C – 75°C)/(56°C/W)
IC’s
maximum
M9999-102309-A
MIC47300
junction