Analog Devices Inc

LT3097 Linear Regulator

Analog Devices' LT3097 linear regulator is designed for powering noise-sensitive applications

Image of Analog Devices' LT3097 Linear RegulatorThe LT3097 is a dual, positive and negative, high-performance, low-dropout (LDO) linear regulator featuring ADI's 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.

The EVAL-LT3097-AZ evaluation board features the LT3097 linear regulator.

Features
  • Ultra-low output RMS noise: 0.8 μVrms (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 μVp-p (positive) and 3.2 μVp-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 x 3 mm, plastic 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
  • Postregulators for switching supplies

ICs

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
IC REG LINEAR POS/NEG ADJ 22-DFNLT3097ADJC#PBFIC REG LINEAR POS/NEG ADJ 22-DFN0 - Immediate$11.64View Details
IC REG LINEAR POS/NEG ADJ 22-DFNLT3097ADJC#TRPBFIC REG LINEAR POS/NEG ADJ 22-DFN0 - Immediate$7.03View Details

Evaluation Board

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
EVAL BOARD FOR LT3097EVAL-LT3097-AZEVAL BOARD FOR LT309722 - Immediate$134.94View Details
Published: 2023-07-18