Electronic Circuit Board Chips LP2985-33DBVR Regulator With Shutdown

LP2985-33DBVR 150-mA Low-Noise Low-Dropout Regulator With Shutdown

FEATURES                                                         PORTABLE APPLICATIONS

•Output Tolerance of                                           • Cellular Phones

– 1% (A Grade)                                                  • Palmtop and Laptop Computers

– 1.5% (Standard Grade)                                   • Personal Digital Assistants (PDAs)

                                                                           • Digital Cameras and Camcorders

•Ultra-Low Dropout, Typically                               • CD Players

– 280 mV at Full Load of 150 mA                       • MP3 Players

– 7 mV at 1 mA                                                                   

• Wide VIN Range…16 V Max

• Low IQ . . . 850 µA at Full Load at 150 mA

• Shutdown Current . . . 0.01 µA Typ

• Low Noise . . . 30 µVRMS With 10-nF Bypass Capacitor

• Stable With Low-ESR Capacitors, Including Ceramic

• Overcurrent and Thermal Protection

• High Peak-Current Capability

DESCRIPTION/ORDERING INFORMATION

The LP2985 family of fixed-output, low-dropout regulators offers exceptional, cost-effective performance for both portable and nonportable applications. Available in voltages of 1.8 V, 2.5 V, 2.8 V, 2.9 V, 3 V, 3.3 V and 5 V, the family has an output tolerance of 1% for the A version (1.5% for the non-A version) and is capable of delivering 150-mA continuous load current. Standard regulator features, such as overcurrent and overtemperature protection, are included. The LP2985 has a host of features that makes the regulator an ideal candidate for a variety of portable applications: • Low dropout: A PNP pass element allows a typical dropout of 280 mV at 150-mA load current and 7 mV at 1-mA load. • Low quiescent current: The use of a vertical PNP process allows for quiescent currents that are considerably lower than those associated with traditional lateral PNP regulators. • Shutdown: A shutdown feature is available, allowing the regulator to consume only 0.01 µA when the ON/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 µVRMS, with the use of a 10-nF bypass capacitor. • Small packaging: For the most space-constrained needs, the regulator is available in the SOT-23 package.

Recommended Operating Conditions