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LP38859_15

更新时间： 2024-11-15 01:10:03
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
25页 2096K
描述
3A Fast-Response High-Accuracy LDO Linear Regulator With Soft Start

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LP38859_15 数据手册

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Sample &  
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Community  
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Folder  
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Technical  
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LP38859  
SNVS337F –JUNE 2006–REVISED SEPTEMBER 2015  
LP38859 3-A Fast-Response High-Accuracy LDO Linear Regulator With Soft Start  
1 Features  
3 Description  
The LP38859 is  
a
high-current, fast-response  
1
•
Input Voltage: 1.1 V to 5.5 V  
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.  
•
•
•
•
Wide VBIAS Supply Operating Range: 3 V to 5.5 V  
Standard VOUT Values: 0.8 V and 1.2 V  
Stable With 10-µF Ceramic Capacitors  
Dropout Voltage of 240 mV (typical) at 3-A Load  
Current  
•
•
Programmable Soft-Start Time  
Precision Output Voltage Across All Line and  
Load Conditions:  
–
–
–
±1% VOUT for TJ = 25°C  
±2% VOUT for 0°C ≤ TJ ≤ +125°C  
±3% VOUT for –40°C ≤ TJ ≤ +125°C  
•
•
Overtemperature and Overcurrent 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 LP38859 is available in 5-pin TO-220  
and DDPAK/TO-263 packages.  
Operating Temperature Range: −40°C to +125°C  
2 Applications  
•
ASIC Power Supplies In:  
Device Information(1)  
–
Desktops, Notebooks, Graphics Cards, and  
Servers  
PART  
NUMBER  
PACKAGE  
BODY SIZE (NOM)  
–
Gaming Set Top Boxes, Printers, and Copiers  
DDPAK/TO-263 (5) 10.16 mm × 8.42 mm  
TO-220 (5) 14.986 mm × 10.16 mm  
•
•
•
Server Core and I/O Supplies  
DSP and FPGA Power Supplies  
SMPS Post-Regulator  
LP38859  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
Typical Application Circuit  
LP38859-x.x  
V
IN  
V
OUT  
IN  
OUT  
C
IN  
10 PF Ceramic  
V
BIAS  
BIAS  
SS  
C
BIAS  
C
OUT  
1 PF  
10 PF  
Ceramic  
GND  
C
SS  
GND  
GND  
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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