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LT1129 Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LT1129 Datasheet(HTML) 1 Page - Linear Integrated Systems |
1 / 16 page 1 LT1129/LT1129-3.3/LT1129-5 112935fc , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. OUTPUT CURRENT (A) 0 0.4 0.5 0.6 0.3 0.5 0.3 0.2 0.1 0.2 0.4 0.6 0.7 0.1 0 LT1129 • TA02 Dropout Voltage 5V Supply with Shutdown The LT ®1129/LT1129-3.3/LT1129-5 are micropower low dropout regulators with shutdown. The devices are ca- pable of supplying 700mA of output current with a dropout voltage of 0.4V at maximum output. Designed for use in battery-powered systems the low quiescent current, 50µA operating and 16µA in shutdown, make them an ideal choice. The quiescent current does not rise in dropout as it does with many other low dropout PNP regulators. Other features of the LT1129 /LT1129-3.3/LT1129-5 in- clude the ability to operate with small output capacitors. They are stable with only 3.3µF on the output while most older devices require between 10µF and 100µF for stabil- ity. Also the input may be connected to ground or a reverse voltage without reverse current flow from output to input. This makes the LT1129/LT1129-3.3/LT1129-5 ideal for backup power situations where 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. The devices are available in 5-lead TO-220, 5-lead DD and 3-lead SOT-223 packages. ■ 0.4V Dropout Voltage ■ 700mA Output Current ■ 50µA Quiescent Current ■ No Protection Diodes Needed ■ Adjustable Output from 3.8V to 30V ■ 3.3V and 5V Fixed Output Voltages ■ Controlled Quiescent Current in Dropout ■ Shutdown ■ 16µA Quiescent Current in Shutdown ■ Stable with 3.3µF Output Capacitor ■ Reverse Battery Protection ■ No Reverse Output Current ■ Thermal Limiting ■ Surface Mount SOT-223 and DD Packages ■ Low Current Regulator ■ Regulator for Battery-Powered Systems ■ Post Regulator for Switching Supplies ■ 5V to 3.3V Logic Regulator IN OUT LT1129-5 GND 5V OUT 500mA VIN > 5.5V 3.3µF SOLID TANTALUM + SENSE LT1129 • TA01 VSHDN (PIN 4) < 0.25 > 2.8 NC OUTPUT OFF ON ON SHDN 1 2 3 4 5 APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO Micropower Low Dropout Regulators with Shutdown |
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