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Micropower Regulator with Comparator and Shutdown
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LT1120A
Micropower Regulator with
Comparator and Shutdown
Features Description 20µA Supply Current
nn 125mA Output Current
nn 2.5V Reference
nn Reference Output Sources 4mA and Sinks 4mA
nn Open Collector Comparator Sinks 10mA
nn Logic Shutdown
nn 0.2V Dropout Voltage
nn Thermal Limiting
nn 8-Lead SO Package The LT®1120A is a combination micropower positive regulator and free collector comparator on a single monolithic
chip. With only 20µA supply current, the LT1120A can
supply over 125mA of output current. Input voltage range
is from 4.5V to 36V and dropout voltage is 0.6V at 125mA.
Dropout voltage decreases with lower load currents. Also
included on the chip is a class B output 2.5V reference
that can either source or sink current. This allows it to be
used as a supply splitter or auxiliary output. A shutdown
pin allows logic shutdown of the output. Applications The comparator can be used for system or battery monitoring. For example, the comparator can be used to warn
of low system voltage. Frequency compensation of the
comparator for amplifier applications can be obtained by
adding external output capacitance. nn Battery Systems …