DALLAS (August 7, 1995) -- A new family of low-dropout (LDO) voltage regulators from Texas Instruments integrates a precise delayed microprocessor reset function, traditionally not found in low-dropout voltage regulators. The new LDO regulators extend the battery life of cellular phones, hand-held instrumentation, personal digital assistants (PDA) and other portable systems.
For microprocessor systems, the integrated device automatically initiates a reset at power-up and power-down or when the output voltage drops below the specified level. The '73xx reset remains low until 200 milli-seconds after the output voltage returns to the level specified for proper system operation.
The 73xx devices replace the typical pnp pass transistor with a PMOS pass element enabling an order of magnitude reduction in the dropout voltage and quiescent current over conventional LDO performance.
The TPS73XX LDO family is made up of four devices, three of which feature a fixed output voltage and a fourth device with an adjustable output voltage. Fixed-voltage devices have outputs of 3.3 volts, 4.85 volts and 5.0 volts, while the adjustable device can be set at any output from 1.2 volts to 9.75 volts. Output voltage tolerance is a maximum of two percent over line, load and temperature ranges (three percent for the adjustable version) with output current ranges of 0 to 250 milli-amps.
The new TPS73XX low-dropout voltage regulators join TI's previous generation TPS71XX and TPS72XX devices, which have an output current range up to 500 milli-amps and 250 milli-amps respectively.
The TPS73XX LDOs are available now from TI and its authorized distributors. Suggested resale pricing in quantities of 1,000 is $1.70 for 8-pin SOIC packages.
Feature Benefit TPS7350 Low dropout voltage - Extends battery life of a 35 milli-Volts with 100 milli-Amp load portable system Low Operating (quiescent) current - Extends battery life of a 340 micro-Amps portable system Shut down current -- 0.5 micro-Amps Sleep mode allows minimum current drain from the battery Compact eight-pin SOIC packages Board space savings
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