New LDO linear voltage regulator claims industry's lowest noise at low frequency

August 30, 2012 // By Paul Buckley
Texas Instruments Incorporated has introduced a high current, ultra-low noise, low dropout (LDO) voltage regulator that achieves the industry’s lowest noise at low frequency.

The 1-A TPS7A4700 LDO linear regulator features less than 4.17-uVrms output noise over the 10-Hz to 100-kHz bandwidth, eliminating the need for expensive and bulky filtering in a wide range of high-performance applications, including telecom, industrial, RF, medical, avionics and military.  

TI’s new TPS7A4700 LDO uses a feature that enables the setting of any output voltage rail in 100-mV increments with simple printed circuit board (PCB) layout changes. This eliminates the need for expensive, high accuracy, external feedback resistors, which saves board area and reduces component count when compared to existing solutions.

With digital control methods such as I2C or PMBus, the user can program the output voltage by selecting to either ground or open the binary-weighted 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.

The TPS7A4700 LDO regulator offers the industry’s lowest noise at low frequency eliminates the need for expensive and bulky filtering in high-performance applications.  Wide bandwidth and high power supply rejection (PSR) allow effective filtering of DC/DC switching supplies running at higher frequencies.  The device’s 36-V input voltage rating allows use in systems running 12-V and 24-V buses with enough headroom to withstand high-voltage transients, eliminating the need for additional suppression circuitry.  The device provides any output voltage rail in 100-mV increments, eliminating the need for expensive external feedback resistors.

Availability and Pricing

The TPS7A4700 is available in volume now from TI and its authorized distributors. Offered in a 5-mm by 5-mm, 20-pin QFN package, the suggested retail price is $2.10 in 1,000-unit quantities.

More information about the TPS7A4700 voltage regulator at www.ti.com/tps7a4700-pr-eu