1FEATURES
2• Ideal for Conversion From 1.8V or 1.5V Inputs
• Designed for Use With Low ESR Ceramic
Capacitors
• Ultra Low Dropout Voltage (115mV at 1.5A typ)
• 0.56V to 1.5V Adjustable Output Range
• Load Regulation of 0.1%/A (typ)
• 30nA Quiescent Current in Shutdown (typ)
• Low Ground Pin Current at all Loads
• Over Temperature/Over Current Protection
• Available in 8 Lead SO PowerPAD Package
• −40°C to +125°C Junction Temperature Range
• UVLO Disables Output When VBIAS < 3.8V

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-Regulators

DESCRIPTION
The LP38842-ADJ 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 the SO PowerPAD package.
Dropout Voltage: 115 mV (typ) at 1.5A load current.
Quiescent Current: 30 mA (typ) at full load.
Shutdown Current: 30 nA (typ) when S/D pin is low.
Precision Reference Voltage: 1.5% room
temperature accuracy.