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LP38855_15

更新时间： 2024-11-15 01:05:59
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德州仪器 - TI /
页数 文件大小 规格书
20页 2093K
描述
1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable

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LP38855_15 数据手册

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LP38855  
www.ti.com  
SNVS461D –OCTOBER 2006–REVISED APRIL 2013  
1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable  
Check for Samples: LP38855  
1
FEATURES  
DESCRIPTION  
The LP38855 is  
a
high-current, fast-response  
2
•
•
Standard VOUT Values of 0.8V and 1.2V  
regulator which can maintain output voltage  
regulation with an extremely low input to output  
voltage drop. Fabricated on a CMOS process, the  
device operates from two input voltages: VBIAS  
provides power for the internal bias and control  
circuits, as well as drive for the gate of the N-MOS  
power transistor, while VIN 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.  
Wide VBIAS Supply Operating Range of 3.0V to  
5.5V  
•
•
Stable with 10 µF Ceramic Capacitors  
Dropout Voltage of 130 mV (Typical) at 1.5A  
Load Current  
•
Precision Output Voltage Across All Line and  
Load Conditions:  
–
–
–
±1.0% for TJ = 25°C  
±2.0% for 0°C ≤ TJ ≤ +125°C  
±3.0% for -40°C ≤ TJ ≤ +125°C  
•
•
•
•
Over-Temperature and Over-Current  
Protection  
The fast transient response of this device makes it  
suitable for use in powering DSP, Microcontroller  
Core voltages and Switch Mode Power Supply post  
regulators. The LP38855 is available in TO-220 and  
DDPAK/TO-263 5-Lead packages.  
Available in 5 Lead TO-220 and DDPAK/TO-263  
Packages  
Custom VOUT Values between 0.8V and 1.2V  
are Available  
Dropout Voltage: 130 mV (typical) at 1.5A load  
current.  
-40°C to +125°C Operating Temperature Range  
APPLICATIONS  
Low Ground Pin Current: 10 mA (typical) at 1.5A  
load current.  
•
ASIC Power Supplies In:  
–
Desktops, Notebooks, and Graphics Cards,  
Servers  
Shutdown Current: 1 µA (typical) IIN(GND) when EN  
pin is low.  
–
Gaming Set Top Boxes, Printers and  
Copiers  
Precision Output Voltage: ±1.0% for TJ = 25°C and  
±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load  
conditions  
•
•
•
Server Core and I/O Supplies  
DSP and FPGA Power Supplies  
SMPS Post-Regulator  
Typical Application Circuit  
LP38855-x.x  
V
IN  
V
OUT  
IN  
OUT  
C
IN  
10 mF Ceramic  
V
BIAS  
BIAS  
EN  
C
BIAS  
1 mF  
C
OUT  
10 mF  
Ceramic  
V
EN  
GND  
GND  
GND  
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 © 2006–2013, Texas Instruments Incorporated  
 
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