The operating quiescent current of the LT3097 is nominally 2.2 mA/2.35 mA (positive/negative) and drops to 0.3 μA/3 μA (positive/negative) in shutdown. It 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.
Key Features and Benefits
- 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 × 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
- Postregulator for switching supplies
Evaluation Board
The LT3097 can be evaluated with the EVAL-LT3097-AZ.
Block Diagrams and Tables
