TI Offers Highest PSRR for 200-mA Applications with Negative Voltage LDOs
1/13/2004 - Texas Instruments Incorporated (TI) (NYSE: TXN) unveiled a family of low-dropout linear regulators (LDOs) that feature the industry´s highest power supply rejection ratio (PSRR) and ultra-low noise for 200-mA, noise-sensitive applications with negative voltages. The highly accurate, low-power LDOs support 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.
The new TPS723xx high performance regulators exhibit 60 µV(RMS) of output noise, and provide a PSRR of 65 dB at 1 kHz to prevent noise coupling from the power supply. The devices are capable of operating with input voltages of -10 V to -2.7 V, and support output voltages ranging from -10 V to -1.2 V. The TPS723xx LDOs are stable with small, low-cost ceramic capacitors, and include enable (EN) and noise reduction (NR) functions. In addition, the highly accurate devices use a precision voltage reference to achieve one percent initial accuracy, and two percent over load, line and temperature variations.
Key Features of the TPS723xx LDOs:
- Ultra-low Noise: 60 µV(RMS) Typical
- High PSRR: 65-dB Typical at 1 kHz
- Low Dropout Voltage: 280 mV Typical at 200 mA, 2.5 V
- Available in -2.5 V, and Adjustable (-1.2 V to -10 V) Versions
- Stable with a 2.2-µF Ceramic Output Capacitor
- Less than 2-µA Typical Quiescent Current in Shutdown Mode
- One Percent Initial Accuracy, Two Percent Over Line, Load and Temperature
- Thermal Shutdown and Over-current Protection
- -40º to 125º C Operating Junction Temperature Range
Availability, Packaging and Pricing
The TPS723xx LDOs are available today in a five-pin, small SOT-23 package from TI and its authorized distributors. Suggested resale pricing in quantities of 1,000 units is $1.05. Development tools for the TPS723xx devices are available in less than 24 hours through power.ti.com.
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