LT3046
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LT3046

20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator

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1ku List Price Starting From $2.92
Features
  • 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 
  • 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
  • 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
Additional Details
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The LT3046 is a high-performance, low-dropout linear regulator featuring Analog Devices, Inc. ultra-low noise and ultra-high PSRR architecture for powering noisesensitive 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.

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.

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
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Part Models 2
1ku List Price Starting From $2.92
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LT3046

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Data Sheet

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UPDATED 11/30/2023
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LT3046: 20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator Data Sheet (Rev.0)

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UPDATED 11/30/2023
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LT3046: 20V、200mA、超低ノイズ、超高 PSRR、リニア・レギュレータ データシート (Rev.0)

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Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3046ATC+ N/A
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LT3046ATC+T N/A
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Apr 27, 2024

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Software & Part Ecosystem

Evaluation Kits 1

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LT3046EVK

Evaluation Kit for the LT3046 20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator

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LT3046EVK

Evaluation Kit for the LT3046 20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator

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LT3046EVK
Evaluation Kit for the LT3046 20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator

Features and Benefits

  • Input Voltage Range: 3.8V to 20V
  • Resistor-Programmed 3.32V Output Voltage
  • Maximum Output Current: 200mA
  • BNC Connectors for Noise and PSRR Measurement
  • Resistor Programmed Power-Good
  • Resistor-Programmable Current Limit, Current Monitoring, and UVLO
  • Thermally Enhanced, 12-Lead, 3mm x 3mm, DFN Package or an 11-ball, 1.621mm × 1.680mm, WLCSP Package
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Product Detail

The LT3046 evaluation kits (EV kits) feature the LT3046, a 20V, 200mA ultra-low noise and ultra-high power-supply rejection ratio (PSRR) low-dropout (LDO) linear regulator.

See the Ordering Information section for the two types of EV kits available to evaluate the LT3046. There is an EV kit that features a 12-lead, 3mm × 3mm, plastic dual-flat no-leads (DFN) package with an e×posed pad on the bottom side of the IC, and there is also an EV kit that features an 11-ball, 1.621mm × 1.680mm, WLCSP Package. Proper board layout is essential for ma×imum thermal performance.

The LT3046 EV boards operate over an input voltage range of 3.8V to 20V. The LT3046 delivers a maximum output current of 200mA. In addition to featuring ultra-low noise and ultra-high PSRR, the regulator offers programmable power-good functionality a programmable current limit. Current monitoring is also chieved by sensing the ILIM pin voltage.

Built-in protection includes reverse-battery protection, reverse-current protection, internal current limit with foldback and thermal limit with hysteresis.

For full details on the LT3046, refer to the LT3046 data sheet, which must be consulted with this user guide when using the LT3046 EV kits.

Design files are available on the LT3046 EV kit page.

Resources

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LT3046EVKIT: Evaluation Board User Guide for LT3046 (Rev.A) Download

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LT3046EVK#DFN - Design Files Download

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LT3046EVK

Evaluation Kit for the LT3046 20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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