LT1129CQ Datasheet

PMIC - Voltage Regulators - Linear (LDO)


The LT®1129/LT1129-3.3/LT1129CQ are micropower lowdropout regulators with shutdown. The devices are capableof supplying 700mA of output current with a dropoutvoltage of 0.4V at maximum output. Designed for use inbattery-powered systems the low quiescent current, 50μAoperating and 16μA in shutdown, make them an idealchoice. The quiescent current does not rise in dropout asit does with many other low dropout PNP regulators.Other features of the LT1129 /LT1129-3.3/LT1129-5 includethe ability to operate with small output capacitors.They are stable with only 3.3μF on the output while mostolder devices require between 10μF and 100μF for stability.Also the input may be connected to ground or a reversevoltage without reverse current flow from output to input.This makes the LT1129/LT1129-3.3/LT1129-5 ideal forbackup power situations where the output is held high andthe input is at ground or reversed. Under these conditions,only 16μA will flow from the output pin to ground. Thedevices are available in 5-lead TO-220, 5-lead DD and3-lead SOT-223 packages. LT1129CQ Features • 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 LT1129CQ Applications • Low Current Regulator• Regulator for Battery-Powered Systems• Post Regulator for Switching Supplies• 5V to 3.3V Logic Regulator


[{"Name":"Number of Regulators","Value":"1"},{"Name":"Voltage - Input","Value":"4.15 V ~ 30 V"},{"Name":"Voltage - Output","Value":"3.8 V ~ 30 V"},{"Name":"Voltage - Dropout (Typical)","Value":"0.45V @ 700mA"},{"Name":"Current - Output","Value":"700mA"},{"Name":"Operating Temperature","Value":"0°C ~ 125°C"},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""}]

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