Power Electronics

LDOs for Noise-Sensitive Applications

Texas Instruments’ (TI’s) three new families of low dropout (LDO) linear regulators provide low noise, high power supply ripple rejection (PSRR), and fast transient response for powering noise-sensitive analog circuitry such as radio frequency (RF) receivers and transmitters, voltage-controlled oscillators (VCOs), and audio amplifiers. They support applications with output currents of 500mA, 1A and 1.5A, such as battery-powered Bluetooth-enabled digital still cameras and personal digital assistants (PDAs), and many applications that operate from a 5/3.3V distributed bus such as line cards and high-end audio products.

Noise-sensitive applications benefit from PSRRs of up to 53 dB at 10 kHz, ultralow output noise (33 uV at 100 Hz to 100 kHz) and fast transient response times. In addition, when the LDO is placed in standby mode, the power supply current is reduced to less than 1 uA, extending battery-life in portable applications.

The TPS795xx, TPS796xx and TPS786xx families are available in fixed output voltages that are adjustable over a range of 1.2V to 5.5V. TI's BiCMOS production process allows TI to obtain a low dropout of 250 uV at 1A, making the LDOs suitable for post-regulation of switching supplies.

The TPS795xx, TPS796xx and TPS786xx are now available in volume from TI and its authorized distributors. They are available in a 5-pin SOT223-5 package and 5-pin DDPAK package.

For more information, visit www.ti.com.

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