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LT3042

更新时间： 2024-11-06 14:57:35
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
32页 3354K
描述
20V、200mA、超低噪声、超高 PSRR RF 线性稳压器

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中文翻译

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LT3042 数据手册

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LT3042  
20V, 200mA, Ultralow Noise,  
Ultrahigh PSRR RF Linear Regulator  
FEATURES  
DESCRIPTION  
The LT®3042 is a high performance low dropout linear  
regulatorfeaturingLTC’sultralownoiseandultrahighPSRR  
architecture for powering noise sensitive RF applications.  
Designed as a precision current reference followed by a  
high performance voltage buffer, the LT3042 can be easily  
paralleled to further reduce noise, increase output current  
and spread heat on the PCB.  
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Ultralow RMS Noise: 0.8µV  
(10Hz to 100kHz)  
RMS  
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Ultralow Spot Noise: 2nV/√Hz at 10kHz  
Ultrahigh PSRR: 79dB at 1MHz  
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Output Current: 200mA  
Wide Input Voltage Range: 1.8V to 20V  
Single Capacitor Improves Noise and PSRR  
100µA SET Pin Current: 1ꢀ Initial Accuracy  
Single Resistor Programs Output Voltage  
High Bandwidth: 1MHz  
The device supplies 200mA at a typical 350mV dropout  
voltage. Operating quiescent current is nominally 2mA  
and drops to <<1µA in shutdown. The LT3042’s wide  
output voltage range (0V to 15V) while maintaining unity-  
gain operation provides virtually constant output noise,  
PSRR, bandwidth and load regulation, independent of the  
programmed output voltage. Additionally, the regulator  
features programmable current limit, fast start-up capa-  
bility and programmable power good to indicate output  
voltage regulation.  
Programmable Current Limit  
Low Dropout Voltage: 350mV  
Output Voltage Range: 0V to 15V  
Programmable Power Good  
Fast Start-Up Capability  
Precision Enable/UVLO  
Parallelable for Lower Noise and Higher Current  
Internal Current Limit with Foldback  
Minimum Output Capacitor: 4.7µF Ceramic  
Reverse Battery and Reverse Current Protection  
10-Lead MSOP and 3mm × 3mm DFN Packages  
AEC-Q100 Qualified for Automotive Applications  
The LT3042 is stable with a minimum 4.7µF ceramic  
output capacitor. Built-in protection includes reverse bat-  
teryprotection,reversecurrentprotection,internalcurrent  
limit with foldback and thermal limit with hysteresis. The  
LT3042 is available in thermally enhanced 10-Lead MSOP  
and 3mm × 3mm DFN packages.  
APPLICATIONS  
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RF Power Supplies: PLLs, VCOs, Mixers, LNAs  
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Very Low Noise Instrumentation  
All registered trademarks and trademarks are the property of their respective owners. Patents  
Pending.  
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High Speed/High Precision Data Converters  
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Medical Applications: Imaging, Diagnostics  
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Precision Power Supplies  
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Post-Regulator for Switching Supplies  
Power Supply Ripple Rejection  
TYPICAL APPLICATION  
120  
110  
100  
90  
LT3042  
IN  
V
IN  
5V 5%  
4.7µF  
100µA  
–
+
EN/UV  
PG  
80  
V
OUT  
200k  
OUT  
3.3V  
70  
60  
50  
40  
30  
20  
I
OUT(MAX)  
OUTS  
200mA  
V
= 5V  
IN  
SET  
GND ILIM PGFB  
4.7µF  
R
C
= 33.2kΩ  
453k  
1%  
SET  
= 4.7µF  
= 4.7µF  
SET  
C
OUT  
499Ω  
I
= 200mA  
L
49.9k  
1%  
33.2k  
1%  
4.7µF  
10  
100  
1k  
10k 100k  
1M  
10M  
3042 TA01a  
FREQUENCY (Hz)  
3042 TA01b  
Rev. C  
1
Document Feedback  
For more information www.analog.com  
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