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LT3046

更新时间： 2024-11-06 17:01:23
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
47页 1267K
描述
20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator

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LT3046 数据手册

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Data Sheet  
LT3046  
20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator  
FEATURES  
GENERAL DESCRIPTION  
The LT3046 is a high-performance, low-dropout linear  
Ultra-Low RMS Noise: 0.8μVRMS (10Hz to 100kHz)  
Ultra-Low Noise: 2.2nV/√Hz at 10kHz  
Ultra-Low 1/f Noise: 2.5μVP-P (0.1Hz to 10Hz)  
Ultra-High PSRR: 82dB at 1MHz  
regulator featuring Analog Devices, Inc. ultra-low noise  
and ultra-high PSRR architecture for powering noise-  
sensitive applications. Designed as a precision current  
reference followed by a high-performance voltage  
buffer, the LT3046 can be easily paralleled to further  
reduce noise, increase output current, and spread heat  
on the PCB.  
Output Current: 200mA  
Wide Input-Voltage Range: 2.2V to 20V  
Single Capacitor Improves Noise and PSRR  
SET Pin Current: 100μA, ±0.5% Initial Accuracy  
Single Resistor Programs Output Voltage  
Programmable Current Limit  
Low Dropout Voltage: 300mV  
Output-Voltage Range: 0.2V to 19V  
Programmable Power Good  
The device supplies 200mA at a typical 300mV dropout  
voltage. Operating quiescent current is nominally  
3.7mA and drops to 26μA in shutdown. The LT3046’s  
wide output-voltage range (0.2V to 19V) 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 capability,  
and programmable power good to indicate output  
voltage regulation.  
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  
Compact, Low-Profile, 12-Lead, 3mm × 3mm, DFN  
Package  
Built-in protection includes reverse-battery protection,  
reverse-current protection, internal current limit with  
foldback and thermal limit with hysteresis. The LT3046  
is available in a thermally enhanced, 12-lead, 3mm ×  
3mm, DFN package.  
APPLICATIONS  
RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs  
Very Low-Noise Instrumentation  
High-Speed/High-Precision Data Converters  
Post-Regulator for Switching Supplies  
TYPICAL APPLICATION  
140  
130  
120  
110  
100  
90  
LT3046  
IN  
V
IN  
5V  
4.7µF*  
100µA  
EN/UV  
PG  
200kΩ  
80  
V
OUT  
3.3V  
70  
OUT  
60  
I
OUT(MAX)  
200mA  
50  
OUTS  
4.7µF  
V
V
C
C
= 5V  
IN  
OUT  
40  
30  
20  
10  
0
= 3.3V  
= 4.7µF  
= 22µF  
453kΩ  
GND  
ILIM  
PGFB  
SET  
SET  
OUT  
I
= 200mA  
L
*OPTIONAL, SEE  
APPLICATIONS  
INFORMATION  
4.7µF  
33.2kΩ  
49.9kΩ  
10  
100  
1k  
10k  
100k  
1M  
10M  
FREQUENCY (Hz)  
Figure 1. Typical Application  
Figure 2. PSRR vs. Frequency  
DOCUMENT FEEDBACK  
T el: 78 1. 3 29 . 4 70 0  
TECHNICAL SUPPORT  
19-101798; Rev 0; 10/23  
One Analog Wa y, Wilmington, MA 0 18 87 - 23 56 , U. S. A.  
© 20 23 Analog D evic es, Inc. Al l rig ht s r eser ved.  
 
 
 
 
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