LP3875| Datasheet

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LP3872/LP3875 1.5A Fast Ultra Low Dropout Linear Regulators

September 2006

LP3872/LP3875 1.5A Fast Ultra Low Dropout Linear Regulators
General Description
The LP3872/LP3875 series of fast ultra low-dropout linear regulators operate from a +2.5V to +7.0V input supply. Wide range of preset output voltage options are available. These ultra low dropout linear regulators respond very quickly to step changes in load, which makes them suitable for low voltage microprocessor applications. The LP3872/LP3875 are developed on a CMOS process which allows low quiescent current operation independent of output load current. This CMOS process also allows the LP3872/LP3875 to operate under extremely low dropout conditions. Dropout Voltage: Ultra low dropout voltage; typically 38mV at 150mA load current and 380mV at 1.5A load current. Ground Pin Current: Typically 6mA at 1.5A load current. Shutdown Mode: Typically 10nA quiescent current when the shutdown pin is pulled low. Error Flag: Error flag goes low when the output voltage drops 10% below nominal value. SENSE: Sense pin improves regulation at remote loads. Precision Output Voltage: Multiple output voltage options are avail
able ranging from 1.8V to 5.0V with a guaranteed accuracy of 1.5% at room temperature, and 3.0% over all conditions (varying line, load, and temperature).

Features
n n n n n n n n n n n n Ultra low dropout voltage Low ground pin current Load regulation of 0.06% 10nA quiescent current in shutdown mode Guaranteed output current of 1.5A DC Available in TO-263, TO-220 and SOT-223 packages Output voltage accuracy 1.5% Error flag indicates output status Sense option improves load regulation Minimum output capacitor requirements Overtemperature/overcurrent protection -40 C to +125 C junction temperature range

Applications
n n n n n n n n Microprocessor power supplies GTL, GTL+, BTL, and SSTL bus terminators Power supplies for DSPs SCSI terminator Post regulators High efficiency linear regulators Battery chargers Other battery powered applications

Typical Application Circuits

20063301

*SD and ERROR pins must be pulled high through a 10k pull-up resistor. Connect the ERROR pin to ground if this function is not used. See application hints for more information.

2006 National Semiconductor Corporation

DS200633

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