The TPS73xx family integrates a supply voltage supervisor (SVS), and low dropout (LDO) voltage regulator for simple, seamless operation with fewer components.
A typical battery-powered system includes the LDO for the longer battery life and SVS to reset the circuit when the battery voltage drops.
Building on our TPS71xx and TPS72xx families of ultra-low dropout regulators, the TPS73xx include on-board precision output-voltage monitoring. An active-low RESET signal is automatically asserted during power up and power down, or any time the output drops below the specified threshold voltage. Once the output voltage is reestablished, RESET stays low for a preset 200 ms (typ) time delay to ensure the system is stable before enabling sensitive circuits.
To achieve extremely low dropout voltage and quiescent currents, the TPS73xx utilize power-efficient PMOS technology. The TPS7350 5-V regulator has a maximum dropout of 32 mV at 100-mA load. Unlike bipolar LDOs, the TPS73xx quiescent currents are low and nearly constant over the full load range - from 0 to 250 mA . A micropower shutdown mode reduces supply current to just 0.5 µA and can be used for power distribution and load management.
The four new devices include three fixed-output-voltage versions (3.3 V, 4.85 V, and 5 V) and an adjustable device (from 1.2 V to 9.75 V). The fixed output voltage options have a maximum of 2% tolerance over full line, load, and temperature conditions; the adjustable device has 3% total tolerance. All devices are available in an 8-pin SOIC package, specified for operation from -40°C to 125°C.
Vol 13, September, 1995
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