ANALOG DEVICES LT1521CST-3#PBF LDO Voltage Regulator, Fixed, 4.3 to 20V in, 500 mV Drop, 3V / 0.3A Out, SOT-223-3, 0 to 125 °C

LT1521CST-3#PBF is a low dropout regulator with micropower quiescent current and shutdown capabilities. This device can supply 300mA of output current with a dropout voltage of 0.5V. Designed for use in battery-powered systems, its low quiescent current 12µA during operation and 6µA in shutdown make it 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 device include the ability to operate with very small output capacitors. It remains stable with only 1.5µF on the output, while most older devices require between 10µF and 100µF for stability. Additionally, the input may be connected to voltages lower than the output voltage, including negative voltages, without reverse current flow from output to input. Applications include low current regulation, regulation for battery-powered systems, and post-regulation for switching supplies.

• Controlled quiescent current in dropout, no protection diodes needed
• Reverse battery protection, no reverse current, thermal limiting
• Regulated output voltage is 3V typical at (VIN = 3.5V, IOUT = 1mA, TJ = 25°C)
• Load regulation is -20mV typical at (?ILOAD = 1mA to 300mA, TJ ? 25°C)
• Dropout voltage is 130mV typical at (ILOAD = 1mA, TJ = 25°C)
• Ground pin current is 12µA typical at (ILOAD = 0mA, TA = 25°C)
• Quiescent current in shutdown is 6µA typical at (VIN = VOUT (NOMINAL) + 1V, VSHDN = 0V)
• Ripple rejection is 58dB typical at (VIN � VOUT = 1V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz)
• Input reverse leakage current is 1mA maximum at (VIN = �20V, VOUT = 0V, TA = 25°C)
• Operating junction temperature range from 0°C to 125°C (commercial), 3-lead plastic SOT-223 package

Notes

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