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LP38843_15

更新时间： 2024-11-15 01:14:27
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德州仪器 - TI /
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3A Ultra Low Dropout Linear Regulators Stable with Ceramic Output Capacitors

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LP38843_15 数据手册

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LP38843  
www.ti.com  
SNVS290C –DECEMBER 2004–REVISED APRIL 2013  
LP38843 3A Ultra Low Dropout Linear Regulators  
Stable with Ceramic Output Capacitors  
Check for Samples: LP38843  
1
FEATURES  
DESCRIPTION  
The LP38843 is  
a
high-current, fast-response  
2
•
•
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  
•
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  
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.  
•
−40°C to +125°C Junction Temperature Range  
APPLICATIONS  
Dropout Voltage: 210 mV (typ) at 3A load current.  
Quiescent Current: 30 mA (typ) at full load.  
•
ASIC Power Supplies In:  
–
Desktops, Notebooks, and Graphics Cards,  
Servers  
Shutdown Current: 30 nA (typ) when S/D pin is low.  
–
Gaming Set Top Boxes, Printers and  
Copiers  
Precision Output Voltage: 1.5% room temperature  
accuracy.  
•
•
•
Server Core and I/O Supplies  
DSP and FPGA Power Supplies  
SMPS Post-Regulator  
TYPICAL APPLICATION CIRCUIT  
LP38843  
IN  
OUT  
S/D  
IN  
OUT  
10 mF  
Ceramic  
4.7 mF*  
BIAS  
5V ± 10%  
BIAS  
S/D  
GND  
0.1 mF  
GND  
GND  
* Minimum value required if Tantalum capacitor is used (see Application Hints).  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
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.  
Copyright © 2004–2013, Texas Instruments Incorporated  
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