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200mA, -36V LDO regulators boast high PSRR, low noise

Posted: 01 Sep 2010 ?? ?Print Version ?Bookmark and Share

Keywords:noise filtering? PSRR?

Designers of precision analog applications can now use what Texas Instruments Inc. (TI) bills as the first -36V low-dropout (LDO) regulators for noise-sensitive applications such as test equipment; industrial, networking and telecom equipment; base stations; microwave and radio links; noise filtering for receive, transmit and power amplifiers; and medical applications.

The TPS7A30, which generates 200mA, and the positive voltage TPS7A49 (150mA) both boast of ultra-high power supply rejection ratio (PSRR) performance and as low as 16uVrms of output noise. TI said the LDO regulators have adjustable output voltage of 1.22V to 34V and are stable with any output capacitance greater than 2.2uF.

Other key features include: wide input voltages of -3V to -36V for the TPS7A30 and +3V to +36V for the TPS7A49; 1.5 percent nominal accuracy over load, line and temperature for better precision for VCOs, PLLs and ADCs; low noise/high PSRR for better range in RF applications, filters, and handling of DC/DC spikes; output noise as low as 16uVRMS; and stability with >2-uF ceramic output capacitor.

The TPS7A30 and TPS7A49, in MSOP-8 PowerPAD packaging, are priced at $1.50 and $1.10, respectively, in quantities of 1,000. The TPS7A30_49EVM-567 evaluation module costs $20.

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