Texas Instruments introduces low-noise DC/DC switching regulators with integrated ferrite bead compensation

Texas Instruments introduces a new family of low-noise DC/DC switching regulators with integrated ferrite bead compensation. The TPS62912 and TPS62913 have low noise of 20 µVRMS in the frequency range of 100 Hz to 100 kHz, and ultra-low output voltage ripple of 10 µVRMS, allowing engineers to eliminate one or more low voltage drop regulators (Ldos) in their designs, reducing power consumption by up to 76%. And save 36% of board space.

Power supply noise is a key design challenge in many high-precision test and measurement, medical, aerospace and defense, and wireless infrastructure applications. The traditional low noise power supply architecture includes a DC/DC converter; A low noise LDO, such as TPS7A52, TPS7A53, or TPS7A54; And an off-chip filter, such as a ferrite magnetic bead. By integrating ferrite bead compensation, the TPS62912 and TPS62913 use the ferrite bead already present in most systems as an effective filter to resist high-frequency noise, thereby reducing the power output voltage ripple by approximately 30 dB and simplifying the power supply design.

Easily reduce power supply noise

High-precision systems require the power rail to have low noise and low ripple to maintain signal accuracy and integrity. The TPS62912 and TPS62913 both meet these requirements and have a power rejection ratio of 65 dB at frequencies up to 100 kHz. In addition, the output voltage error of this buck converter family is less than 1%, helping to ensure strict output voltage accuracy. Both converters can use spread spectrum frequency modulation to further attenuate RF spursity and allow synchronization with external clocks, so engineers can easily meet their signal-to-noise ratio (SNR) and spury-free dynamic range (SFDR) goals, which are critical for applications like medical imaging or radar.

Maximize efficiency while reducing power consumption

Engineers have historically faced a trade-off between noise and efficiency when powering sensitive analog circuits. Using a switching regulator alone leads to too much switching noise, while adding a rear regulator LDO to reduce the noise leads to additional power consumption, especially at high load currents. The peak efficiency of the TPS62912 and TPS62913 is up to 97%, allowing engineers to perform noise-filtering designs without the need for LDO, reducing power consumption by 76% - 1.8W for the analog front end (AFE) and 1.5W for broadband analog-to-digital converters (ADCs) such as the ADC12DJ5200RF. This represents a 20 percent and 15 percent increase in efficiency, respectively, compared to traditional low-noise power supply architectures.