Data Sheet
LT3097
Dual 500mA, Positive/Negative, Ultra-Low Noise, Ultra-High PSRR Low Dropout
Linear Regulator
FEATURES
APPLICATIONS
► Ultra-low output RMS noise: 0.8 μV rms (10 Hz to 100 kHz)
► Bipolar very low-noise power supplies
► Ultra-low output noise spectral density: 2 nV/√Hz (Positive) and
2.2 nV/√Hz (Negative) at 10 kHz
► RF power supplies: phase-locked loops, voltage-controlled oscil-
lators, mixers, low-noise amplifiers, and power amplifiers
► Ultra-low 1/f noise: 10 µV p-p (Positive) and 3.2 µV p-p (Nega-
tive) (0.1 Hz to 10 Hz)
► Ultra-high PSRR: 76 dB (Positive) and 74 dB (Negative) at 1
MHz
► Low-noise instrumentation
► High-speed and high-precision data converters
► Medical applications: imaging and diagnostics
► Precision power supplies
► Output current: 500 mA
► Postregulator for switching supplies
► 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)
GENERAL DESCRIPTION
The LT3097 is a dual, positive and negative, high-performance,
low-dropout linear regulator featuring Analog Devices, Inc., ultra-
low noise and ultra-high power supply rejection ratio (PSRR) archi-
tecture for powering noise-sensitive applications. Each regulator
delivers up to 500 mA with a typical 260 mV/235 mV (positive/nega-
tive) dropout voltage.
► Programmable power good
► Fast start-up capability
Operating quiescent current is nominally 2.2 mA/2.35 mA (posi-
tive/negative) and drops to 0.3 µA/3 µA (positive/negative) in shut-
down. 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.
► 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
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 protec-
tion. The LT3097 is available in a thermally enhanced, 22-lead 6
mm × 3 mm, Plastic dual-flat no-leads (DFN) package.
TYPICAL APPLICATION
Figure 2. PSRR vs. Frequency
Figure 1. Typical Application
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to
change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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