LDO Voltage Regulator

February 1, 2013

Texas Instruments (TI) (Dallas, TX) has introduced a high-current, ultra-low-noise, 1-A TPS7A4700 low dropout (LDO) voltage regulator. The regulator features less than 4.17-uVrms output noise over the 10-Hz to 100-kHz bandwidth. The TPS7A4700 LDO enables the setting of any output voltage rail in 100-mV increments.

With digital control methods such as I2C or PMBus, the user programs the output voltage by selecting to either ground or open the binaryweighted device pins. For systems where both positive and negative voltage rails are required, the TPS7A4700 can be used together with TI’s -36V/-1A TPS7A3301 LDO linear regulator.

A wide bandwidth and high power supply rejection (PSR) allow effective filtering of DC/DC switching supplies running at higher frequencies. 36V input voltage rating enables use in systems running 12V and 24V buses with enough headroom to withstand high-voltage transients. The TPS7A4700 is offered in a 20-pin, 5mm x 5mm QFN package.

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