LP38842-ADJ
www.ti.com
SNVS304A –FEBRUARY 2005–REVISED APRIL 2013
LP38842-ADJ 1.5A Ultra Low Dropout Adjustable Linear Regulators
Stable with Ceramic Output Capacitors
Check for Samples: LP38842-ADJ
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FEATURES
DESCRIPTION
The LP38842-ADJ is a high current, fast response
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Ideal for Conversion From 1.8V or 1.5V Inputs
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.
Designed for Use With Low ESR Ceramic
Capacitors
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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
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.
APPLICATIONS
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ASIC Power Supplies In:
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Desktops, Notebooks, and Graphics Cards,
Servers
Dropout Voltage: 115 mV (typ) at 1.5A load current.
Quiescent Current: 30 mA (typ) at full load.
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Gaming Set Top Boxes, Printers and
Copiers
Shutdown Current: 30 nA (typ) when S/D pin is low.
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Server Core and I/O Supplies
DSP and FPGA Power Supplies
SMPS Post-Regulators
Precision
temperature accuracy.
Reference
Voltage:
1.5%
room
TYPICAL APPLICATION CIRCUIT
OUT
OUT
IN
IN
R1
R2
10 mF
Ceramic
LP38842-
ADJ
C
FF
ADJ
S/D
BIAS
5V ± 10%
BIAS
S/D
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0.1 mF
GND
4.7 mF
GND
GND
* Minimum value required if Tantalum capacitor is used (see Application Hints).
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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