MIC59300 Datasheet, PDF (11/15 Pages) Micrel Semiconductor – Ultra High Speed 3A LDO

Micrel, Inc.
capacitor of at least 1μF is needed directly between the
input and regulator ground. Refer to “Application Note 9”
(http://www.micrel.com/_PDF/App-Notes/an-9.pdf) for
further details and examples on thermal design and heat
sink specification.
Minimum Load Current
The MIC59300, unlike most other high current
regulators, does not require a minimum load to maintain
output voltage regulation.
Adjustable Regulator Design
The MIC59300 adjustable version allows programming
the output voltage anywhere between 0.5Vand 3.3V.
Two resistors are used. The resistor value between VOUT
and the adjust pin should not exceed 10kΩ. Larger
values can cause instability. The resistor values are
calculated by:
MIC59300
R₁
= R₂
× ⎜⎛ ^VOUT
⎝ ^0.5
− 1⎟⎞
⎠
where VOUT is the desired output voltage.
Enable
An active high enable input (EN) allows on-off control of
the regulator. Current drain reduces to “zero” when the
device is shutdown, with only microamperes of leakage
current. The EN input has CMOS compatible thresholds
for simple logic interfacing. EN may be directly tied to
V_BIAS and pulled up to the maximum supply voltage.
EPad
The exposed pad on the bottom of the SOIC part must
be connected to ground.
January 2009
11
M9999-010809-A