0.8A Fast-Response Ultra Low Dropout Linear

 

 

Regulators

General Description

The LP3891 is a high current, fast response regulator which

can maintain output voltage regulation with minimum input to

output voltage drop. Fabricated on a CMOS process, the

device operates from two input voltages: Vbias provides

voltage to drive the gate of the N-MOS power transistor,

while Vin is the input voltage which supplies power to the

load. The use of an external bias rail allows the part to

operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architectutre consumes extremely low quiescent current at any output load current. The use of an

N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability.

The fast transient response of these devices makes them

suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The

parts are available in TO-220 and TO-263 packages.

Dropout Voltage: 100 mV (typ) @ 0.8A load current.

Ground Pin Current: 3 mA (typ) at full load.

Shutdown Current: 60 nA (typ) when S/D pin is low.

Precision Output Voltage: 1.5% room temperature accuracy.

 

 

Features

 Ultra low dropout voltage (100mV @ 0.8A typ)

 Low ground pin current

 Load regulation of 0.04%/A

 60 nA typical quiescent current in shutdown

 1.5% output accuracy (25?C)

 TO-220, TO-263 packages

 Over temperature/over current protection

 −40?C to +125?C junction temperature range

 

 

 

Applications

 DSP Power Supplies

 Server Core and I/O Supplies

 PC Add-in-Cards

 Local Regulators in Set-Top Boxes

 Microcontroller Power Supplies

 High Efficiency Power Supplies

 SMPS Post-Regulators

 

 

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