LT3097
Info : RECOMMENDED FOR NEW DESIGNS
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LT3097

Dual 500mA, Positive/Negative, Ultra-Low Noise, Ultra-High PSRR Low Dropout Linear Regulator

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $5.35
Features
  • Ultra-low output RMS noise: 0.8 μV rms (10 Hz to 100 kHz)
  • Ultra-low output noise spectral density: 2 nV/√Hz (Positive) and 2.2 nV/√Hz (Negative) at 10 kHz
  • Ultra-low 1/f noise: 10 μV p-p (Positive) and 3.2 μV p-p (Negative) (0.1 Hz to 10 Hz)
  • Ultra-high PSRR: 76 dB (Positive) and 74 dB (Negative) at 1 MHz
  • Output current: 500 mA
  • Wide input voltage range: ±1.8 V to ±20 V
  • Single capacitor per channel improves noise and PSRR
  • SET pin current: 100 μA, ±1% initial accuracy
  • Single resistor per channel programs output voltage
  • Programmable current limit
  • Low-dropout voltage: 260 mV (Positive) and 235 mV (Negative)
  • Output voltage range: 0 V to 15 V (Positive) and 0 V to –19.5 V (Negative)
  • Programmable power good
  • Fast start-up capability
  • Precision enable/undervoltage lockout (UVLO)
  • Internal current limit with foldback
  • Minimum output capacitor: 10 μF ceramic
  • Compact, low-profile, 22-lead, 6 mm × 3 mm, Plastic DFN package
Additional Details
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The LT3097 is a dual, positive and negative, high-performance, low-dropout linear regulator featuring Analog Devices, Inc., ultralow noise and ultra-high power supply rejection ratio (PSRR) architecture for powering noise-sensitive applications. Each regulator delivers up to 500 mA with a typical 260 mV/235 mV (positive/negative) dropout voltage.

Operating quiescent current is nominally 2.2 mA/2.35 mA (positive/negative) and drops to 0.3 μA/3 μA (positive/negative) in shutdown. The LT3097 has a wide output voltage range (0 V to 15 V, positive and 0 V to -19.5 V, negative) error amplifier that operates in unity-gain and provides virtually constant output noise, PSRR, bandwidth and load regulation, independent of the programmed output voltage.

LT3097 is stable with a minimum 10 μF ceramic output capacitor for each channel. Built-in protection includes internal current limit with foldback and thermal limit with hysteresis. The positive regulator also includes reverse-battery protection and reverse-current protection. The LT3097 is available in a thermally enhanced, 22-lead 6 mm × 3 mm, Plastic dual-flat no-leads (DFN) package.

APPLICATIONS

  • Bipolar very low-noise power supplies
  • RF power supplies: phase-locked loops, voltage-controlled oscillators, mixers, low-noise amplifiers, and power amplifiers
  • Low-noise instrumentation
  • High-speed and high-precision data converters
  • Medical applications: imaging and diagnostics
  • Precision power supplies
  • Postregulator for switching supplies
Part Models 2
1ku List Price Starting From $5.35

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3097ADJC#PBF
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  • HTML
LT3097ADJC#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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EVAL-LT3097

Evaluating the LT3097 Dual 500mA, Positive/Negative, Ultra-Low Noise, Ultra-High PSRR, Low Dropout Linear Regulator

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EVAL-LT3097

Evaluating the LT3097 Dual 500mA, Positive/Negative, Ultra-Low Noise, Ultra-High PSRR, Low Dropout Linear Regulator

Evaluating the LT3097 Dual 500mA, Positive/Negative, Ultra-Low Noise, Ultra-High PSRR, Low Dropout Linear Regulator

Features and Benefits

  • Input voltage range: ±3.8 V to ±20 V
  • Resistor programmed ±3.32 V output
  • Maximum output current: 500 mA
  • BNC Connectors for noise and PSRR measurement
  • Resistor programmed power good
  • Resistor-programmable current limit and UVLO
  • Positive-channel current monitoring
  • Thermally enhanced 22-lead, 6 mm × 3 mm, Plastic DFN package

Product Detail

The EVAL-LT3097-AZ evaluation board features the LT3097, a dual 500mA, positive/negative, ultra-low noise, and ultra-high power supply rejection ratio (PSRR), low-dropout (LDO) linear regulator.

The EVAL-LT3097-AZ operates over an input voltage range of 3.8 V to 20 V for the positive channel and an input voltage range of -3.8V to -20V for the negative channel. The LT3097 delivers maximum output currents of 500mA. In addition to featuring ultra-low noise and ultra-high PSRR, each channel of the regulator offers programmable power good functionality and a programmable current limit. Current monitoring is also achieved for the positive channel by sensing the ILIMP pin voltage. ILIMN architecture does not allow output current monitoring for the negative channel. The negative channel enable function (ENN/UVN pin) is bidirectional and can be controlled with either a positive or a negative voltage.

Built-in protection for the positive channel includes reverse-battery protection and reverse current protection. Built-in protection for both channels includes an internal current limit with foldback and a thermal limit with hysteresis.

For full details on the LT3097, refer to the LT3097 datasheet, which must be consulted with the user guide when using the EVAL-LT3097-AZ evaluation board.

The LT3097 of the EVAL-LT3097-AZ features a 22-lead, 6 mm x 3 mm plastic dual-flat no-leads (DFN) package with exposed pads on the bottom side of the IC. Proper board layout is essential for maximum thermal performance.

Tools & Simulations

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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