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LP38842-ADJ PDF预览

LP38842-ADJ

更新时间: 2024-09-27 02:58:51
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德州仪器 - TI /
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15页 846K
描述
1.5A Ultra Low Dropout Adjustable Linear Regulators Stable with Ceramic Output Capacitors

LP38842-ADJ 数据手册

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LP38842-ADJ  
www.ti.com  
SNVS304A FEBRUARY 2005REVISED APRIL 2013  
LP38842-ADJ 1.5A Ultra Low Dropout Adjustable Linear Regulators  
Stable with Ceramic Output Capacitors  
Check for Samples: LP38842-ADJ  
1
FEATURES  
DESCRIPTION  
The LP38842-ADJ 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  
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  
ASIC Power Supplies In:  
Desktops, Notebooks, and Graphics Cards,  
Servers  
Dropout Voltage: 115 mV (typ) at 1.5A load current.  
Quiescent Current: 30 mA (typ) at full load.  
Gaming Set Top Boxes, Printers and  
Copiers  
Shutdown Current: 30 nA (typ) when S/D pin is low.  
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  
*
0.1 mF  
GND  
4.7 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 © 2005–2013, Texas Instruments Incorporated  
 

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