This device is designed to have a fast transient response and be stable with 10 µF
capacitors. This combination provides high performance at a reasonable cost.
Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low
(typically 230 mV at an output current of 1 A for the TPS76850-Q1) and is directly proportional to
the output current. Additionally, because the PMOS pass element is a voltage-driven device, the
quiescent current is very low and independent of output loading (typically 85 µA over the full
range of output current, 0 mA to 1 A). These two key specifications yield a significant improvement
in operating life for battery-powered systems. This LDO family also features a shutdown mode;
applying a TTL high signal to the enable (EN) input shuts down the
regulator, reducing the quiescent current to less than 1 µA at TJ =
Power good (PG) is an active-high output, which can be used to implement a power-on reset
or a low-battery indicator.
The TPS768xx-Q1 is offered in 1.8-V, 2.5-V, 3.3-V, and 5-V fixed-voltage versions and in an adjustable version (programmable over the range of
1.2 V to 5.5 V). Output voltage tolerance is specified as a maximum of 2% over line, load, and
temperature ranges. The TPS768xx-Q1 family is available in a 20-pin PWP package.
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