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LP3852

更新时间： 2024-11-15 02:58:35
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德州仪器 - TI /
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1.5-A Fast Response Ultra-Low Dropout Linear Regulators

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LP3852, LP3855  
SNVS174I –FEBRUARY 2003–REVISED FEBRUARY 2015  
LP385x 1.5-A Fast Response Ultra-Low Dropout Linear Regulators  
1 Features  
3 Description  
The LP3852 and LP3855 series of fast ultra-low  
1
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Input Supply Voltage: 2.5 V to 7 V  
Ultra-Low Dropout Voltage  
dropout linear regulators operate from a 2.5-V to 7-V  
input supply. A wide range of preset output voltage  
options are available. These ultra-low dropout linear  
regulators respond very quickly to step changes in  
load, which makes them suitable for low voltage  
microprocessor applications. The LP3852 and  
LP3855 are developed on a CMOS process which  
allows low quiescent-current operation independent  
of output load current, typically 4 mA at 1.5-A load  
current. This CMOS process also allows the LP3852  
and LP3855 to operate under extremely low dropout  
conditions, typically 24 mV at 150-mA load current  
and 240 mV at 1.5-A load current.  
Stable with Selected Ceramic Capacitors  
Low Ground-Pin Current  
Load Regulation of 0.06%  
10-nA Quiescent Current in Shutdown Mode  
Specified Output Current of 1.5 A DC  
Output Voltage Accuracy ± 1.5%  
ERROR Pin Indicates Output Status  
SENSE Option Improves Load Regulation  
Overtemperature/Overcurrent Protection  
−40°C to 125°C Junction Temperature Range  
The LP3852 has an ERROR pin; it goes low when  
the output voltage drops 10% below nominal value.  
The LP3855 has a SENSE pin to improves regulation  
at remote loads.  
2 Applications  
•
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•
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Microprocessor Power Supplies  
GTL, GTL+, BTL, and SSTL Bus Terminators  
Power Supplies for DSPs  
SCSI Terminator  
The LP3852 and LP3855 are available with fixed  
output voltages from 1.8 V to 5 V with a specified  
accuracy of ±1.5% at room temperature, and ±3%  
over all conditions (varying line, load, and  
temperature). Contact Texas Instruments Sales for  
specific voltage option needs.  
Post Regulators  
High Efficiency Linear Regulators  
Battery Chargers  
Device Information(1)  
Other Battery Powered Applications  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
6.50 mm x 3.56 mm  
10.16 mm x 8.42 mm  
14.986 mm x 10.16 mm  
SOT (5)  
LP3852  
LP3855  
TO-263 (5)  
TO-220 (5)  
(1) For all available packages, see the orderable addendum at  
the end of the datasheet.  
4 Simplified Schematics  
V
INPUT  
3.3V ± 10%  
OUT  
IN  
OUT  
2.5V, 1.5A  
C
*
C *  
OUT  
IN  
10 PF  
LP3852-2.5  
10 PF  
SD  
ERROR  
GND  
ERROR**  
SD**  
* TANTALUM OR CERAMIC  
**SD and ERROR pins must be pulled high through a 10-kΩ pull-up resistor. Connect the ERROR pin to ground if this  
function is not used.  
V
INPUT  
3.3V ± 10%  
OUT  
2.5V, 1.5A  
OUT  
IN  
C
*
C *  
OUT  
IN  
10 PF  
LP3855-2.5  
10 PF  
SENSE  
GND  
SD  
SD**  
* TANTALUM OR CERAMIC  
**SD must be pulled high through a 10-kΩ pull-up resistor.  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
 
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