LDOs keep it quiet for analogue supply

Three new families of LDOs provide low noise, high power supply ripple rejection and fast transient response for powering noise-sensitive analogue circuitry.

Three new families of low-dropout linear regulators (LDOs) provide low noise, high power supply ripple rejection (PSRR) and fast transient response for powering noise-sensitive analogue circuitry such as RF receivers and transmitters, voltage-controlled oscillators (VCOs) and audio amplifiers.

The new LDOs support applications with output currents of 500mA, 1A and 1.5A, such as battery-powered Bluetooth-enabled digital still cameras and 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 will benefit from PSRRs of up to 53dB at 10kHz, the ultra-low output noise (33uV at 100Hz to 100kHz) and fast transient response times.

In addition, when the LDO is placed in standby mode, the power supply current is reduced to less than 1uA, 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 1.2 to 5.5V.

TI's BiCMOS production process allows TI to obtain a low dropout of 250mV at 1A, making the LDOs suitable for postregulation of switching supplies.

The TPS795xx, TPS796xx and TPS786xx are now available in volume from TI and its authorised distributors.

The devices are available in five-pin SOT223-5 packages and five-pin DDPAK packages.

Pricing per 1000 units of the SOT223-5 option is $0.96 for the TPS795xx, $1.04 for the TPS796xx and $1.28 for the TPS786xx.

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