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

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

* 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