MAS9128AS Просмотр технического описания (PDF) - Micro Analog Systems Oy
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MAS9128AS Datasheet PDF : 7 Pages
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The device is supplied with 3.1V to 6.5V battery
voltage under normal conditions. An internal band
gap voltage reference is used to generate the
reference voltage for all three voltage regulators.
The reference voltage is routed via an internal
20kOhm Resistor to an external pin where a filter
capacitor can be connected in order to reduce the
noise level of all three regulators. The startup time
of the reference voltage is then determined by the
value of the bypass capacitor at pin VREF.
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Each regulator can be enabled/disabled by the two
enable pins ENA and ENBC. Pin ENA controls
regulator LDO_A and pin ENBC controls both
regulators LDO_B and LDO_C. If both enable pins
are forced low, the internal voltage reference and
DA9128A.002
July 12, 1998
internal bias source are turned off in order to save
power. A common enable for all three regulator
outputs is designed, but connected to VDD
internally for the SOIC8 version of MAS9128A.
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The device contains three 2.85V low dropout CMOS
regulators with maximum output currents of 100mA,
70mA and 50mA. There is a mask option to modify
the output voltage to 2.55V, 2.70V, 2.85V, 3.00V or
3.15V. The IC has thermal protection in order to
prevent thermal destruction especially at high
ambient temperatures. Maximum output current of
each regulator is limited by an internal circuitry. The
regulation loop of the regulators is optimized to work
with low ESR ceramic buffer capacitors at the
output.
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