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LP38858

更新时间： 2024-11-15 02:58:35
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德州仪器 - TI /
页数 文件大小 规格书
21页 2122K
描述
1.5A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start

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LP38858 数据手册

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LP38858  
www.ti.com  
SNVS462D –OCTOBER 2006–REVISED APRIL 2013  
1.5A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start  
Check for Samples: LP38858  
1
FEATURES  
DESCRIPTION  
The LP38858 is a high current, fast response  
regulator which can maintain output voltage  
regulation with extremely low 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.  
2
•
•
Standard VOUT Values of 0.8V and 1.2V  
Wide VBIAS Supply Operating Range of 3.0V to  
5.5V  
•
•
Stable with 10µF Ceramic Capacitors  
Dropout Voltage of 130 mV (Typical) at 1.5A  
Load Current  
•
Precision Output Voltage across All Line and  
Load Conditions:  
–
–
–
±1.0% VOUT for TJ = 25°C  
±2.0% VOUT for 0°C ≤ TJ ≤ +125°C  
±3.0% VOUT 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 LP38858 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: 130mV (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  
Soft-Start: Programmable Soft-Start time.  
Precision Output Voltage: ±1.0% for TJ = 25°C and  
±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load  
conditions  
–
Gaming Set Top Boxes, Printers and  
Copiers  
•
•
•
Server Core and I/O Supplies  
DSP and FPGA Power Supplies  
SMPS Post-Regulator  
Typical Application Circuit  
LP38858-x.x  
V
IN  
V
OUT  
IN  
OUT  
C
IN  
10 mF Ceramic  
V
BIAS  
BIAS  
SS  
C
BIAS  
C
OUT  
1 mF  
10 mF  
Ceramic  
GND  
C
SS  
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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LP38858 替代型号

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