Linear Technology Unveils New LDOs Featuring Ultra-Low Noise and High PSRR
Published2016.10.12 17:33Linear Technology Korea (CEO Hong Sa-kwak) announced the introduction of a new product (product name: LT3045), a low dropout (LDO) voltage linear regulator featuring ultra-low noise and high PSRR (power supply ripple rejection).
This product is a high output version of the widely used 200mA ultra-low noise LDO, the LTC3042. The LT3045's proprietary design enables ultra-low spot noise of approximately 2nV/√Hz at 10kHz and integrated output noise of 0.8µVRMS over a wide 10Hz to 100kHz bandwidth.
High and low frequency PSRR performance is also excellent. Low frequency PSRR exceeds 90dB up to 10kHz and high frequency PSRR exceeds 70dB up to 2.5MHz, allowing for smoother operation of noisy or high ripple input power supplies. The LT3045 utilizes Linear's proprietary LDO architecture, which uses a precision current source reference and a high-performance unity-gain buffer to provide virtually constant bandwidth, noise, PSRR, and load regulation performance regardless of output voltage. Furthermore, this architecture allows for paralleling multiple LT3045s, further reducing noise and increasing output current to better distribute heat on the PCB.
The LT3045 delivers up to 500mA of output current with a 260mV dropout voltage at full load over an input voltage range of 1.8V to 20V.
The maximum output voltage range is 0 V to 15 V, and the output voltage tolerance is highly accurate to ±2% over the entire line, load, and temperature ranges. The device's wide input and output voltage ranges, high bandwidth, high PSRR, and ultra-low noise performance make it ideal for noise-sensitive applications such as PLLs, VCOs, mixers, LNAs, ultra-low-noise devices, high-speed/high-precision data converters, medical equipment such as imaging and diagnostics, and as a post-regulator for precision power supplies and switching supplies.
The LT3045 optimizes stability and transient response with a small, low-cost 10µF ceramic output capacitor. A single resistor programs the external precision current limit (±10% over temperature). A single SET capacitor reduces output noise and provides reference soft-start functionality, preventing output voltage overshoot at turn-on. Furthermore, the device's internal protection circuitry includes reverse-battery protection, reverse-current protection, internal current limit with foldback, and thermal limiting with hysteresis. Other features include fast start-up capability (useful when a large-value SET pin capacitor is used) and a power-good flag with programmable threshold to indicate output voltage regulation.
The LT3045 is available in a thermally enhanced 10-lead 3mm x 3mm DFN (pin compatible with the LT3042) and a 12-lead MSOP package (both featuring a compact footprint). The E- and I-grade versions operate over a temperature range of –40°C to 125°C and are available immediately. A higher-temperature H-grade version, capable of operating from –40°C to 150°C, will be available in the future. These devices are in stock now, with pricing starting at $2.80 per unit for the E-grade in quantities of 1,000.
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