The device delivers up to 50 mA of continuous output current at output voltages up to 20V with total ripple and noise below 100 µVP-P. It operates from a 3V to 20V input voltage range. The LT3095’s fixed-frequency, peak current-mode step-up DC/DC converters include an integrated 950 mA power switch, Schottky diode and internal frequency compensation. Switching frequency is programmable between 450 kHz and 2 MHz via a single resistor or synchronisable to an external clock, enabling the use of tiny external components. Combined with a compact 3 x 5mm QFN package, the LT3095 offers a simple, compact solution footprint with good efficiency for instrumentation amplifiers, RF and data conversion systems, and other low noise biasing applications.
The LT3095’s linear regulators employ Linear’s current-source reference architecture, providing benefits such as single-resistor output voltage setting capability and bandwidth, noise, PSRR and load regulation performance virtually independent of output voltage. Integrated output noise (in a 10 Hz to 100kHz bandwidth) is 4 µVRMS and PSRR exceeds 70 dB over the entire switching frequency range, resulting in total noise and ripple under 100 µVP-P. The linear regulator adjusts the step-up converter’s output voltage to 2V above the linear regulator’s output voltage, optimising power dissipation, transient response and PSRR performance. To enhance system reliability, the LT3095 offers short-circuit and thermal protection, as well as providing independent precision enable/UVLO thresholds for each channel. Micropower operation results from both EN pins being pulled low.
The LT3095’s symmetric pinout simplifies PCB design. The device is housed in a thermally enhanced, 3 x 5 mm QFN-24 package, in both industrial E- & I-grade with -40°C to 125°C temperature range, and military MP-grade versions operating from -55°C to 125°C. The E grade is priced at $2.95 (1,000).
Linear Technology; www.linear.com/product/LT3095