Dallas - Texas Instruments says its TPS723xx family of low-dropout, negative-voltage linear regulators deliver the industry's highest power supply rejection ratio (PSRR) - 65 dB at 1 kHz - for 200-mA, negative-voltage applications. The LDOs, suited to battery-powered applications including portable charge-coupled device (CCD) cameras and PDA displays, and applications with noise-sensitive circuitry such as optical drives, optical networking and video amplifiers, provide an adjustable -1.2 to -10 volts or a fixed -2.5 volts from a -2.7 to -10 volt input.
These LDOs use a precision voltage reference to achieve one percent initial accuracy, and two percent accuracy over line, load, and temperature variations. They feature low dropout (280 mV typical at 200 mA, 2.5 volts) and low noise (60 microvolts rms). The LDOs are stable with small, low-cost ceramic capacitors. Quiescent current is less than 2 microamps typical in the shutdown mode. The chip contains thermal shutdown and over-current protection circuitry, and is rated for operation over -40 to +125°C.
The TPS723xx LDOs are available in a five-pin SOT-23 package. Suggested resale pricing in quantities of 1,000 units is $1.05 each. Development tools for the TPS723xx devices are available in less than 24 hours through power.ti.com.