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DESCRIPTION/ORDERING INFORMATIONThe LP2985 family of fixed-output, low-dropout regulators offers excepTIonal, cost-effecTIve performance for bothportable and nonportable applications. Available in voltages of 1.8 V, 2.5 V, 2.8 V, 2.9 V, 3 V, 3.1 V, 3.3 V, 5 V,and 10 V, the family has an output tolerance of 1% for the A version (1.5% for the non-A version) and is capableof delivering 150-mA continuous load current. Standard regulator features, such as overcurrent andovertemperature protection, are included.The LP2985 has a host of features that makes the regulator an ideal candidate for a variety of portableapplications:• Low dropout: A PNP pass element allows a typical dropout of 280 mV at 150-mA load current and 7 mV at1-mA load.• Low quiescent current: The use of a vertical PNP process allows for quiescent currents that are considerablylower than those associated with traditional lateral PNP regulators.• Shutdown: A shutdown feature is available, allowing the regulator to consume only 0.01 µ A when theON/ OFF pin is pulled low.• Low-ESR-capacitor friendly: The regulator is stable with low-ESR capacitors, allowing the use of small,inexpensive, ceramic capacitors in cost-sensitive applications.• Low noise: A BYPASS pin allows for low-noise operation, with a typical output noise of 30 µ V RMS , with theuse of a 10-nF bypass capacitor.• Small packaging: For the most space-constrained needs, the regulator is available in the SOT-23 package.
