Ricoh launches high performance Seamless LDO with low current consumption
In 2005 Ricoh designed a smart solution called Seamless LDO technology. The RP122 features both LDO types and offers an impressive 90 dB ripple rejection, fast transient response speed and only 9.5 µA current consumption without output load. Additionally, it has a very low noise level at the output voltage, only 8 µVrms. These features are especially of an advantage for battery-powered devices with noise sensitive circuits such as smartphones, tablets, digital cameras, RF modules, AD and DA converters etc. The RP122 contributes to lower the total supply current of the device and increases the lifetime of the battery, also it eliminates the need to switch between operating modes since the LDO adapts seamlessly to the output current demand.
A number of protection circuits are integrated, a fold-back current limit circuit decreases the output current to approximately 70 mA in case of a short circuit, protecting the LDO and other electronic parts of the application for damage. The thermal protection shuts the LDO down when the junction temperature increases above 165°C. An inrush current limit circuit prevents any output overshoot and undershoot during the start-up period. The inrush period is internally fixed has a maximum of around 700 µs.
The RP122 has an optional auto-discharge function, this feature rapidly discharges the output capacitor once the chip is set to the standby mode. As for a stable operation small ceramic capacitors with a low ESR value and a minimum of 1.0µF can be used. The RP122 is available in a small sized 1.0 x 1.0 mm DFN(PLP)1010-4 and 0.64 x 0.64 mm WLCSP-4-P8 package.
Features RP122 | |
Input Voltage Range | 1.7 V to 5.25 V |
Output Voltage Range | (in 0.1 V step) 1.2 V to 4.8 V |
Output Current | 400 mA |
Supply Current | (at no load) Typ. 9.5 μA |
Standby Current | 0.01 µA |
Output Noise | (Iout = 250 mA) Typ. 8 μVrms |
Ripple Rejection | Typ. 90 dB / 85 dB / 65 dB @ resp. 1 / 10 / 100 kHz |
Dropout Voltage | (Iout = 400 mA, Vset = 2.8 V, RP122K) Typ. 0.17 V |
Protection Circuits | Over-Current, Short-Circuit, Thermal Shutdown |
Inrush Current Limit | Typ. 250 mA |
Inrush Current Limit Period | 700 μs |
Ceramic Capacitor | 1.0 μF or more |
Package | WLCSP-4-P8, DFN(PLP)1010-4 |
| About Ricoh |
Ricoh is empowering digital workplaces using innovative technologies and services that enable individuals to work smarter from anywhere.
With cultivated knowledge and organizational capabilities nurtured over its 85-year history, Ricoh is a leading provider of digital services, information management, and print and imaging solutions designed to support digital transformation and optimize business performance.
Headquartered in Tokyo, Ricoh Group has major operations throughout the world and its products and services now reach customers in approximately 200 countries and regions. In the financial year ended March 2022, Ricoh Group had worldwide sales of 1,758 billion yen (approx. 14.5 billion USD).
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