A few years ago, Nisshinbo Micro Devices introduced the RP122 LDO Regulator, an advanced seamless LDO solution addressing the challenge of balancing high-performance and low current consumption.
The RP122 is a standout for its combination of features, offering high ripple rejection, fast transient response and a remarkably low current consumption of 9.5µA at no load. Electronics designers often face a trade-off between LDO types: selecting low current consumption at the cost of performance or opting for high performance but enduring higher internal current use. The RP122 eliminates this compromise through Nisshinbo’s seamless LDO technology, first developed in 2005. It integrates both LDO benefits to deliver superior ripple rejection of 90dB, fast transient response and ultra-low noise output at just 8µVrms. These features make it especially suited for battery-powered, noise-sensitive devices like A/D and D/A converters, RF modules, clock generators, wearables, and digital cameras to name but a few.
The RP122 also helps conserve energy by minimizing the total supply current of the application, extending battery life by adapting its smart behaviour seamlessly based on the output current demands. In this way, there is no need to toggle between operating modes, saving additional circuitry design and control software. The LDO’s current consumption is only enlarged when it is actually needed. A maximum of 400mA can be obtained from the output; however, Nisshinbo also launched another family member, the RP123, a similar device that outputs a maximum of 250mA.
To enhance reliability, the RP122 incorporates multiple protection circuits such as fold-back current limit, thermal protection and inrush current limit. Further flexibility is provided by an optional auto-discharge feature for rapid capacitor discharge in standby mode. The LDO operates stably with small ceramic capacitors with an ESR of 1.0µF or higher.
Available in a regular SOT-23-5 and small DFN(PL)1010-4B package for space-constrained designs.
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