1FEATURES

2• Ideal for Conversion From 1.8V or 1.5V Inputs

• Designed for use with low ESR Ceramic

Capacitors

• 0.8V, 1.2V and 1.5V Standard Voltages

Available

• Ultra Low Dropout Voltage (210mV at 3A typ)

• 1.5% Initial Output Accuracy

• Load Regulation of 0.1%/A (Typical)

• 30nA Quiescent Current in Shutdown (Typical)

• Low Ground Pin Current at all Loads

• Over Temperature/Over Current Protection

• Available in 5 Lead TO-220 and DDPAK/TO-263

Packages

• −40°C to +125°C Junction Temperature Range

APPLICATIONS

• ASIC Power Supplies In:

– Desktops, Notebooks, and Graphics Cards,

Servers

– Gaming Set Top Boxes, Printers and

Copiers

• Server Core and I/O Supplies

• DSP and FPGA Power Supplies

• SMPS Post-Regulator

DESCRIPTION

The LP38843 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 architecture 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 DDPAK/TO-263 packages.

Dropout Voltage: 210 mV (typ) at 3A load current.

Quiescent Current: 30 mA (typ) at full load.

Shutdown Current: 30 nA (typ) when S/D pin is low.

Precision Output Voltage: 1.5% room temperature

accuracy.