LT1529 LT1529-3.3/LT1529-5 3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown UFEATURESDESCRIPTIO ■ Dropout Voltage: 0.6V at IOUT = 3A The LT®1529/LT1529-3.3/LT1529-5 are 3A low dropout ■ Output Current: 3A regulators with micropower quiescent current and shut- ■ Quiescent Current: 50 µ A down. The devices are capable of supplying 3A of output ■ No Protection Diodes Needed current with a dropout voltage of 0.6V. Designed for use ■ Adjustable Output from 3.8V to 14V in battery-powered systems, the low quiescent current, ■ 3.3V and 5V Fixed Output Voltages 50µA operating and 16µA in shutdown, make them an ■ Controlled Quiescent Current in Dropout ideal choice. The quiescent current is well controlled; it ■ Shutdown IQ = 16µA does not rise in dropout as it does with many other low ■ Stable with 22µF Output Capacitor dropout PNP regulators. ■ Reverse Battery Protection Other features of the LT1529 /LT1529-3.3/LT1529-5 in- ■ No Reverse Current clude the ability to operate with small output capacitors. ■ Thermal Limiting They are stable with 22µF on the output while most older U devices require up to 100µF for stability. Small ceramic APPLICATIO S capacitors can be used, enhancing manufacturabiltiy. Also the input may be connected to voltages lower than the ■ High Efficiency Regulator output voltage, including negative voltages, without re- ■ Regulator for Battery-Powered Systems verse current flow from output to input. This makes the ■ Post Regulator for Switching Supplies LT1529/LT1529-3.3/LT1529-5 ideal for backup power ■ 5V to 3.3V Logic Regulator situations where the output is held high and the input is at , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 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 and 5-lead DD packages. UTYPICAL APPLICATIODropout Voltage 0.6 5V Supply with Shutdown 0.5 5 1 5V VIN OUTPUT + 3A LT1529-5 0.4 VIN > 5.5V 22µF 4 2 SHDN SENSE 0.3 GND 3 0.2 DROPOUT VOLTAGE (V) VSHDN (PIN 4) OUTPUT 0.1 < 0.25 OFF > 2.8 ON 0 NC ON LT1529 • TA01 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT CURRENT (A) LT1529 • TA02 152935fb 1
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