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Low noise, high ripple rejection LDO regulators

Compact, low noise, high ripple rejection LDO regulator series delivers enhanced power rail stabilisation in space-constrained designs

Toshiba announces the TCR3RM series of low noise ultra-compact low dropout (LDO) voltage regulators. 

Constructed in a plastic DFN4C package measuring 1.00mm x 1.00mm x 0.38 mm, the TCR3RM series comprises 32 product variants with fixed single output voltages in the range 0.9VDC to 4.5VDC.

The regulators are suitable for use in a wide variety of portable and wearable devices, such as sensors, RF devices and IoT applications or any applications where the available board space is at a premium and high-density mounting is required.

The TCR3RM series features a high ripple rejection ratio characteristic of, typically, 100 dB at 1 kHz measured with a 2.8 V output. Unlike other LDO regulators where the ripple rejection ratio usually drops 20 dB every 10-fold increase in frequency, the TCR3RM falls significantly less. 

The rejection ratio at 1 MHz and a 2.8 V output is 68 dB. Electrical noise is an increasing challenge for many designs, particularly DC/DC converters where higher switching frequencies are used to improve conversion efficiency. 

The ripple rejection attributes of the TCR3RM series coupled with its low noise credentials, typically 5µVrms at 10Hz ≤ f ≤ 100kHz, contribute to a high degree of power supply line stability and voltage accuracy.

With a maximum output current of 300 mA, the TCR3RM series employs a bandgap circuit, a low pass filter, and a low-noise, high speed operational amplifier to provide the regulator with excellent ripple rejection and output noise specifications.

The dropout voltage is typically 130mV at 2.8V / 300mA output. Across the series the input voltage range is from 1.8V to 5.5V. The regulator includes overcurrent protection, auto discharge, and thermal shutdown safety features.

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