LP2985-33DBVR 150-mA Low Noise Low Droupout Regulator With Shutdown Original IC Chip

LP2985-33DBVR 150-mA LOW-NOISE LOW-DROPOUT REGULATOR WITH SHUTDOWN

FEATURES

• Output Tolerance of – 1% (A Grade)   – 1.5% (Standard Grade)

• Ultra-Low Dropout, Typically  – 280 mV at Full Load of 150 mA  - 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 LP2985 150-mA LOW-NOISE LOW-DROPOUT REGULATOR WITH SHUTDOWN SLVS522J–JULY 2004–REVISED AUGUST 2006

• Output Tolerance of

• Cellular Phones – 1% (A Grade)

• Palmtop and Laptop Computers

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

• 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

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.

Absolute Maximum Ratings (1)

over virtual junction temperature range (unless otherwise noted)

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) If load is returned to a negative power supply in a dual-supply system, the output must be diode clamped to GND.

(3) The PNP pass transistor has a parasitic diode connected between the input and output. This diode normally is reverse biased (VIN > VOUT), but will be forward biased if the output voltage exceeds the input voltage by a diode drop (see Application Information for more details).

(4) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

(5) The package thermal impedance is calculated in accordance with JESD 51-7.