250-mA ultra-low IQ low-dropout voltage regulator

The TPS766 is a low-dropout (LDO)

linear voltage regulator that supports an input voltage range from 2.5V to 16V (new

chip) and up to 250mA of load current. For the new chip, the supported output range

is from 1.2V to 12V (fixed version) or from 0.8V to 14.6V (adjustable version).

The input voltage range is up to 16V

(new chip), which makes the device a good choice for operating from transformer

secondary windings and regulated rails (such as 10V or 12V). Additionally, the wide

output voltage range allows the device to generate the bias voltage for silicon

carbide (SiC) gate drivers and microphones, as well as power microcontrollers (MCUs)

and processors.

Wide bandwidth PSRR performance is

greater than 70dB at 1kHz and 46dB at 1MHz (new chip), which helps attenuate the

switching frequency of an upstream DC/DC converter and minimizes post regulator

filtering. The new chip supports internal soft-start circuit mechanism that reduces

inrush current during start-up, thus allowing for smaller input capacitance.

The legacy chip supports constant

quiescent current across the complete load current range (typically 35µA for the

full range of output current, 0mA to 250mA).

The TPS766 LDO also features a sleep

mode, where applying a TTL high signal to EN (enable) shuts

down the regulator. In disabled mode, the quiescent current for the legacy chip is

less than 1µA (typ) and the quiescent current for the new chip is approximately

1.6µA (typ).

Power-good (PG) is an active-high

output used to implement a power-on reset or a low-battery indicator.

For the fixed-output version, The

TPS766 provides an output range of 1.5V to 5.0V (legacy chip) and 1.2V to 12V (new

chip). For the adjustable version, program the output voltage over the range of

1.25V to 5.5V (legacy chip) and 0.8V to 14.6V (new chip). The TPS766 is available in

an 8-pin SOIC package.