MIC5203-2.6BM4 MICREL [Micrel Semiconductor], MIC5203-2.6BM4 Datasheet - Page 8

• Manufacturer Part Number: MIC5203-2.6BM4
• Description: ?Cap 80mA Low-Dropout Regulator
• Manufacturer: MICREL [Micrel Semiconductor]

Applications Information
Input Capacitor
A 0.1µF capacitor should be placed from IN to GND if
there is more than 10 inches of wire between the input
and the AC filter capacitor or when a battery is used as
the input.
Output Capacitor
Typical PNP based regulators require an output
capacitor to prevent oscillation. The MIC5203 is
ultrastable, requiring only 0.47µF of output capacitance
for stability. The regulator is stable with all types of
capacitors, including the tiny, low-ESR ceramic chip
capacitors. The output capacitor value can be increased
without limit to improve transient response.
The capacitor should have a resonant frequency above
500kHz. Ceramic capacitors work, but some dielectrics
have poor temperature coefficients, which will affect the
value of the output capacitor over temperature. Tantalum
capacitors are much more stable over temperature, but
typically are larger and more expensive. Aluminum
electrolytic capacitors will also work, but they have
electrolytes that freeze at about –30°C. Tantalum or
ceramic capacitors are recommended for operation
below –25°C.
Micrel, Inc.
November 2009
8
No-Load Stability
The MIC5203 will remain stable and in regulation with no
load (other than the internal voltage divider) unlike many
other voltage regulators. This is especially important in
CMOS RAM keep-alive applications.
Enable Input
The MIC5203 features nearly zero off-mode current.
When EN (enable input) is held below 0.6V, all internal
circuitry is powered off. Pulling EN high (over 2.0V) re-
enables the device and allows operation. EN draws a
small amount of current, typically 15µA. While the logic
threshold is TTL/CMOS compatible, EN may be pulled
as high as 20V, independent of V
IN
.
M9999-111909
MIC5203