Toshiba Introduces High Ripple Rejection Ratio, Low Noise LDO Regulators with Improved Power Line Stability

     Toshiba Electronic Components & Storage Corporation has launched the "TCR3RM Series" consisting of 32 LDO voltage regulator products to provide more stable DC power for mobile devices such as smartphones and wearables. The new TCR3RM series combines a bandgap circuit with a low-pass filter (allowing only very low frequencies to pass) and a low-noise, high-speed op amp to achieve an industry-leading high ripple rejection ratio and low output noise voltage.

     The 32 products in the series offer a maximum output current of 300mA and output voltages between 0.9V and 4.5V. Customers can choose the output voltage according to the actual application. Housed in a compact DFN4C package measuring only 1mm x 1mm, this family is suitable for camera and audio applications, as well as power line RF circuits for mobile devices such as smartphones and wearables that require high-density mounting.

     In an ordinary LDO regulator, when the input voltage noise frequency exceeds 1kHz, the ripple rejection ratio decreases by about 20dB for every 10 times the frequency. When the noise frequency exceeds 100kHz, the ripple rejection ratio decreases by about 40dB for every 10-fold increase in frequency. Therefore, LDO regulators may not be sufficient to eliminate noise generated in DC-DC converter circuits or similar circuits at frequencies above 100kHz.

     The new products provide excellent ripple rejection ratio and output noise voltage characteristics, even when the noise frequency reaches or exceeds 100kHz. This helps stabilize the supply voltage and provides high output voltage accuracy.