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LT3045

更新时间： 2024-11-06 01:11:03
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
36页 3270K
描述
20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator with VIOC Control

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LT3045 数据手册

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LT3045-1  
20V, 500mA, Ultralow Noise,  
Ultrahigh PSRR Linear Regulator with VIOC Control  
FEATURES  
DESCRIPTION  
n
Ultralow RMS Noise: 0.8µV  
(10Hz to 100kHz)  
The LT®3045-1 is a high performance low dropout linear  
regulatorfeaturingLTC’sultralownoiseandultrahighPSRR  
architectureforpoweringnoisesensitiveapplications.De-  
signed as a precision current reference followed by a high  
performance voltage buffer, the LT3045-1 can be easily  
paralleled to further reduce noise, increase output current  
and spread heat on the PCB. In addition to the LT3045  
feature set, the LT3045-1 incorporates a VIOC tracking  
function to control an upstream switching converter to  
maintain a constant voltage across the LT3045-1 and  
hence minimize power dissipation.  
RMS  
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Ultralow Spot Noise: 2nV/√Hz at 10kHz  
Ultrahigh PSRR: 76dB at 1MHz  
Output Current: 500mA  
Wide Input Voltage Range: 1.8V to 20V  
Single Capacitor Improves Noise and PSRR  
100µA SET Pin Current: 1ꢀ Initial Accuracy  
VIOC Pin Controls Upstream Regulator to Minimize  
Power Dissipation  
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Single Resistor Programs Output Voltage  
Programmable Current Limit  
Low Dropout Voltage: 260mV  
The device supplies 500mA at a typical 260mV dropout  
voltage. Operating quiescent current is nominally 2.3mA  
and drops to <<1µA in shutdown. The LT3045-1’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.  
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: 10µF Ceramic  
Reverse-Battery and Reverse-Current Protection  
12-Lead MSOP and 3mm × 3mm DFN Packages  
The LT3045-1 is stable with a minimum 10µF ceramic  
output capacitor. Built-in protection includes reverse-  
battery protection, reverse-current protection, internal  
currentlimitwithfoldbackandthermallimitwithhysteresis.  
The LT3045-1 is available in thermally enhanced 12-Lead  
MSOP and 3mm × 3mm DFN packages.  
APPLICATIONS  
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RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs  
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Very Low Noise Instrumentation  
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High Speed/High Precision Data Converters  
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Medical Applications: Imaging, Diagnostics  
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Post-Regulator for Switching Supplies  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog  
Devices, Inc. Patents pending. All other trademarks are the property of their respective owners.  
Noise Spectral Density  
TYPICAL APPLICATION  
1000  
0.22µF  
2.2µH  
LDO = 4.3V  
IN  
LT8608  
LT3045-1  
OUT  
IN  
LDO  
= 3.3V  
V
IN  
12V  
OUT  
= 500mA  
IN  
BST  
SW  
PG  
I
LOAD  
100  
10  
47µF  
100µA  
–
+
EN/UV  
TR/SS  
MODE  
EN/UV  
PGFB  
10nF  
V
I
: VARIABLE  
: 500mA  
OUT  
OUT(MAX)  
2.21k  
1
OUTS  
PG  
R
FB  
VIOC  
4.7µF  
T
V
– V  
= 1V  
LDOUT  
40.2k  
LDOIN  
7.68k  
SET  
GND ILIM  
10µF  
INTV  
1µF  
GND  
CC  
0.1  
0.01  
30451 TA01a  
LDO  
OUT  
IN  
LDO  
249Ω  
Noise Floor  
f
= 1MHz  
SW  
10  
100  
1k  
10k 100k  
1M  
10M  
L: XFL4020-222MEC  
FREQUENCY (Hz)  
30451 TA01b  
30451fa  
1
For more information www.linear.com/LT3045-1  
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