MIC47300 Datasheet, PDF (8/11 Pages) Micrel Semiconductor – 3A, Low Voltage, Adjustable LDO Regulator with Dual Input Supply

Micrel, Inc.
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_JA) of the D-Pak adhering to the
following criteria for the PCB design: 2 oz. copper and
100mm² copper area for the MIC47300. Given a
maximum ambient temperature (T_A=75°C), and without
the use of a heat sink, the maximum power allowed that
MIC47300
would not exceed the IC’s maximum junction
temperature (125°C) is
P_D(MAX) = (T_J(MAX) – T_A)/θ_JA = (125°C – 75°C)/(56°C/W)
= 0.893W
Minimum Load Current
The MIC47300, unlike most other high current
regulators, does not require a minimum load to maintain
output voltage regulation.
October 2009
8
M9999-102309-A