LT1521 Series

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

Catalog

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

Part	Protection Features	Number of Regulators	Package / Case	Package / Case [y]	Package / Case [x]	Output Configuration	Mounting Type	Current - Supply (Max) [Max]	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Supplier Device Package	Voltage - Input (Max) [Max]	Voltage - Output (Min/Fixed)	Voltage Dropout (Max) [Max]	Control Features	Current - Output	PSRR	Output Type	Voltage - Output (Max) [Max]	Package / Case [custom]	Package / Case
Analog Devices LT1521IS8-5#PBF	Over Current Over Temperature Reverse Polarity	1	8-SOIC	3.9 mm	0.154 in	Positive	Surface Mount	12 mA	125 °C	-40 °C	1.81 mOhm	8-SO	20 V	5 V	0.75 V	Enable	300 mA	58 dB
Analog Devices LT1521CS8-3#PBF	Over Current Over Temperature Reverse Polarity	1	8-SOIC	3.9 mm	0.154 in	Positive	Surface Mount	12 mA	125 °C	0 °C	1.81 mOhm	8-SO	20 V		0.75 V	Enable	300 mA	58 dB
Analog Devices LT1521CS8-3#TRPBF	Over Current Over Temperature Reverse Polarity	1	8-SOIC	3.9 mm	0.154 in	Positive	Surface Mount	12 mA	125 °C	0 °C	1.81 mOhm	8-SO	20 V		0.75 V	Enable	300 mA	58 dB
Analog Devices LT1521IST-5#TRPBF	Over Current Over Temperature Reverse Polarity	1	TO-261-4 TO-261AA			Positive	Surface Mount	12 mA	125 °C	-40 °C	1.81 mOhm	SOT-223-3	20 V	5 V	0.75 V	Enable	300 mA	58 dB
Analog Devices LT1521CS8#PBF	Over Current Over Temperature Reverse Polarity	1	8-SOIC	3.9 mm	0.154 in	Positive	Surface Mount	12 mA	125 °C	0 °C		8-SO	20 V	3.8 V	0.75 V	Enable	300 mA	58 dB	Adjustable	20 V
Analog Devices LT1521CST-3#TRPBF	Over Current Over Temperature Reverse Polarity	1	TO-261-4 TO-261AA			Positive	Surface Mount	12 mA	125 °C	0 °C	1.81 mOhm	SOT-223-3	20 V		0.75 V	Enable	300 mA	58 dB
Analog Devices LT1521CS8-3.3#PBF	Over Current Over Temperature Reverse Polarity	1	8-SOIC	3.9 mm	0.154 in	Positive	Surface Mount	12 mA	125 °C	0 °C	1.81 mOhm	8-SO	20 V	3.3 V	0.75 V	Enable	300 mA	58 dB
Analog Devices LT1521CMS8-3#TRPBF	Over Current Over Temperature Reverse Polarity	1	8-MSOP 8-TSSOP			Positive	Surface Mount	12 mA	125 °C	0 °C	1.81 mOhm	8-MSOP	20 V		0.75 V	Enable	300 mA	58 dB			0.118 in	3 mm

Catalog

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

Key Features

• Dropout Voltage: 0.5V

• Output Current: 300mA

• Quiescent Current: 12µA

• No Protection Diodes Needed

• Adjustable Output from 3.8V to 20V

• Fixed Output Voltages: 3V, 3.3V, 5V

• Controlled Quiescent Current in Dropout

• Shutdown IQ= 6µA

• Reverse Battery Protection

• No Reverse Current

• Thermal Limiting

Description

The LT1521/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, 12μA 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 1.5μF on the output while most older devices require between 10μF and 100μF for stability. Small ceramic capacitors can be used, enhancing manufacturability. Also, the input may be connected to voltages lower than the output voltage, including negative voltages, without reverse current flow from output 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 5μA will flow from the output pin to ground.APPLICATIONSLow Current RegulatorRegulator for Battery-Powered SystemsPost Regulator for Switching Supplies