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LT1521IS8-5 Datasheet(PDF) 1 Page - Linear Technology |
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LT1521IS8-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1521/LT1521-3 LT1521-3.3/LT1521-5 The LT ®1521/LT1521-3/LT1521-3.3/LT1521-5 are low dropout regulators with micropower quiescent current and shutdown. These devices are capable of supplying 300mA of output current with a dropout voltage of 0.5V. Designed for use in battery-powered systems, the low quiescent current, 12 µA operating and 6µA in shutdown, makes them an ideal choice. The quiescent current is well controlled; it does not rise in dropout as it does with many other low dropout PNP regulators. Other features of the LT1521/LT1521-3/LT1521-3.3/ LT1521-5 include the ability to operate with very small output capacitors. They are stable with only 1.5 µF on the output while most older devices require between 10 µF and 100 µF for stability. Small ceramic capacitors can be used, enhancing manufacturability. Also, the input may be con- nected to voltages lower than the output voltage, including negative voltages, without reverse current flow from out- put to input. This makes the LT1521 series ideal for backup power situations where the output is held high and the input is low or reversed. Under these conditions only 5 µA will flow from the output pin to ground. 300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown FEATURES DESCRIPTION TYPICAL APPLICATION 5V Battery-Powered Supply with Shutdown Dropout Voltage s Dropout Voltage: 0.5V s Output Current: 300mA s Quiescent Current: 12 µA s No Protection Diodes Needed s Adjustable Output from 3.8V to 20V s Fixed Output Voltages: 3V, 3.3V, 5V s Controlled Quiescent Current in Dropout s Shutdown IQ = 6µA s Reverse Battery Protection s No Reverse Current s Thermal Limiting OUTPUT CURRENT (mA) 0 0 0.1 0.2 0.3 0.4 0.6 50 100 150 200 LT1521 • TA02 250 300 0.5 8 5 1 2 3 + 6V 1.5 µF 1 µF 5V 300mA VSHDN (PIN 5) OUTPUT <0.25 OFF >2.80 ON NC ON LT1521-5 GND IN SHDN OUT SENSE LT1521 • TA01 , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIONS s Low Current Regulator s Regulator for Battery-Powered Systems s Post Regulator for Switching Supplies |
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