Datasheet > LT3046

LT3046

更新时间： 2024-04-09 19:00:41

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

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: 0.8μV_RMS(10Hz to 100kHz)

Ultra-Low Noise: 2.2nV/√Hz at 10kHz

Ultra-Low 1/f Noise: 2.5μV_P-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

LT3046

4.7µF*

100µA

EN/UV

200kΩ

OUT

3.3V

OUT

OUT(MAX)

200mA

OUTS

4.7µF

= 5V

OUT

= 3.3V

= 4.7µF

= 22µF

453kΩ

GND

ILIM

PGFB

SET

OUT

= 200mA

*OPTIONAL, SEE

APPLICATIONS

INFORMATION

4.7µF

33.2kΩ

49.9kΩ

100

10k

100k

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.

12 3 4 5 6 7...47

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