LT1121CS8-5#PBF

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1. DESCRIPTION

The LT1121CS8-5#PBF are micropower low dropout regulators with shutdown. These devices are capable of supplying 150mAof output currentwith a dropout voltage of 0.4V. Designed for use in battery-powered systems, the lowquiescent current, 30µA operating and 16µA 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. Otherfeaturesofthe LT1121CS8-5#PBF include the ability to operate with very small output capacitors. They are stable with only 0.33µF on the output while most older devices require between 1µF and 100µF for stability. Small ceramic capacitors can be used, enhancing manufacturability. Also the input may be connected to ground or a reverse voltage without reverse current flow from output to input. This makes the LT1121 series ideal for backup power situationswhere the output is held high and the input is at ground or reversed. Under these conditions only 16µA will flow from the output pin to ground. 

2. FEATURES

    1. 0.4V Dropout Voltage

    2. 150mA Output Current

    3. 30µA Quiescent Current

    4. No Protection Diodes Needed

    5    . Adjustable Output from 3.75V to 30V

    6. 3.3V and 5V Fixed Output Voltages

    7. Controlled Quiescent Current in Dropout

    8. Shutdown

    9. 16µA Quiescent Current in Shutdown

  10. Stable with 0.33µF Output Capacitor

  11. Reverse Battery Protection

  12. No Reverse Current with Input Low

  13. Thermal Limiting

  14. Available in the 8-Lead SO, 8-Lead PDIP, 3-Lead SOT-23 and 3-Lead TO-92 Packages

3. APPLICATIONS

    1. Low Current Regulator

    2. Regulator for Battery-Powered Systems

    3. Post Regulator for Switching Supplies