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LT1020 Datasheet(PDF) 1 Page - Linear Technology |
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LT1020 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1020 Micropower Regulator and Comparator S FEATURE s 40 µA Supply Current s 125mA Output Current s 2.5V Reference Voltage s Reference Output Sources 1mA and Sinks 0.5mA s Dual Output Comparator s Comparator Sinks 10mA s Dropout Detector s 0.2V Dropout Voltage s Thermal Limiting s Available in SO Package S APPLICATI s Battery Systems s Battery Backup Systems s Portable Terminals s Portable Instruments The LT1020 is a combination micropower positive regula- tor and free collector comparator on a single monolithic chip. With only 40 µA supply current, the LT1020 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. A dropout detector provides an output current to indicate when the regulator is about to drop out of regulation. The dual output comparator can be used as a comparator for system or battery monitoring. For example, the com- parator can be used to warn of low system voltage while the dropout detector shuts down the system to prevent abnormal operation. Frequency compensation of the com- parator for amplifier applications can be obtained by adding external output capacitance. Dual output or posi- tive and negative regulators can also be made. The 2.5V reference will source or sink current. This allows it to be used as a supply splitter or auxiliary output. DESCRIPTIO APPLICATI TYPICAL 5V Regulator Dropout Voltage and Supply Current + VIN > 5.2V IQ = 40µA 10 µF 10 µF 0.001 µF 1M 1M 5V 2 11 3 9 VIN VOUT FB GND + LT1020 1020 TA01 OUTPUT CURRENT (mA) 0.1 0.01 0.1 1 10 1000 1020 TA02 1 100 0.1 1 10 |
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