TI LDO family features high PSRR

The family of low-dropout linear regulators (LDOs) from Texas Instruments Inc. (TI) is claimed by the company to feature the industry's highest power supply rejection ratio (PSRR) and ultra-low noise for 200mA, noise-sensitive applications with negative voltages.

Designed for use in portable charge-coupled device (CCD) cameras, PDA displays, optical drives, optical networking and video amplifiers, the TPS723xx regulators exhibit 60?V (RMS) of output noise and provide a PSRR of 65dB at 1kHz to prevent noise coupling from the power supply.

The devices are capable of operating with input voltages of -10V to -2.7V, and support output voltages ranging from -10V to -1.2V. With a <2?A quiescent current in shutdown mode, it is stable with small, low-cost ceramic capacitors and include enable and noise reduction functions. The product also uses a precision voltage reference to achieve one percent initial accuracy, and two percent over load, line and temperature variations.

Rated for operation between the -40°C to 125°C temperature range, the LDO is available in a five-pin, small SOT-23 package for $1.05 in 1,000-unit quantities.