MIC5202 Datasheet, PDF (12/22 Pages) Micrel Semiconductor – Dual 100mA Low-Dropout Voltage Regulator Preliminary Information

MIC5202
4.0 APPLICATION INFORMATION
The MIC5202 is a dual linear voltage regulator with low
dropout voltage and low ground current features. Ideal
for battery-operated applications, the MIC5202 offers
1% output voltage accuracy, two independent enable
pins, reversed battery protection, short circuit current
limit and overtemperature protection. When the
MIC5202 is disabled, the ground pin current drops to
sub-micro amp and prolongs the battery life.
4.1 Input Supply Voltage
V_IN1 and V_IN2 provide power to each internal circuit and
may be tied together.
4.2 Ground
Both ground pins (pin 2 and 4) must be tied to the same
ground potential when using a single power supply.
4.3 Input Capacitor
A 1 µF tantalum or aluminum electrolytic capacitor
should be placed close to each V_IN pin if there is more
than 10 inches of copper between the input and the
capacitor, or if a battery is used as the supply.
4.4 Output Capacitor
The MIC5202 requires an output capacitor of 1 µF or
greater to maintain stability. Increasing the output
capacitor leads to an improved transient response;
however, the size and cost also increase. Most
tantalum and aluminum electrolytic capacitors are
adequate; film capacitors will work as well, but at a
higher cost. Many aluminum electrolytics have
electrolytes that freeze at –30°C, so tantalum
capacitors are recommended for operations below
–25°C. An equivalent series resistance (ESR) of 5Ω or
less with a resonance frequency above 500 kHz is
recommended. The output capacitor value may be
increased without limit.
At lower output loads, a smaller output capacitor value
is required for output stability. The capacitor can be
reduced to 0.47 µF for current below 10 mA or 0.33 µF
for current below 1 mA.
4.5 No-Load Stability
Unlike many other voltage regulators, the MIC5202
remains stable and in regulation with no load. This is
especially important in CMOS RAM keep-alive
applications.
4.6 Enable Input
The MIC5202 features dual active-high enable pins
that allow each regulator to be enabled and disabled
independently. Forcing the enable pin low disables the
regulator and sends it to a “zero” off-mode-current
state. In this state, current consumed by the regulator
goes nearly to zero. Forcing the enable pin high
enables the output voltage. The active-high enable pin
typically consumes 8 µA of current and cannot be left
floating; a floating enable pin may cause an
indeterminate state on the output.
4.7 Thermal Shutdown
When the internal die temperature of MIC5202 reaches
the limit, the internal driver is disabled until the die
temperature falls.
DS20005614A-page 12
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