Nisshinbo RP122Z Low Dropout (LDO) Regulators
Nisshinbo RP122Z Low Dropout (LDO) Regulators provide 90dB ripple rejection and fast transient response speed, with only 9.5µA current consumption without output load. These regulators also have a low 8µVRMS noise level at the output voltage. These features make the Nisshinbo RP122Z series ideal for battery-powered devices with noise-sensitive circuits, such as smartphones, tablets, and RF modules. Ricoh RP122Z LDO Regulators contribute to lowering the device's total supply current and increasing the battery's lifetime, which also eliminates the need to switch between operating modes since the LDO adapts seamlessly to the output current demand.
Nisshinbo RP122Z LDO regulators integrate several protection features. A fold-back current limit circuit decreases the output current to approximately 70mA in case of a short circuit, protecting the LDO and other electronic parts of the application from damage. Thermal protection shuts down the LDO when the junction temperature increases above +165°C. An inrush current limit circuit prevents any output overshoots and undershoots during the start-up period. The inrush period is internally fixed with a maximum of 700µs.
The series also offers an optional auto-discharge function. This feature rapidly discharges the output capacitor once the IC is set to standby mode. To enhance stable operation, a small ceramic capacitor with a low ESR value and a minimum of 1.0µF can be used.
Ricoh RP122Z regulators are offered in a compact WLCSP-4-P8 package. They are RoHS compliant and halogen free.
Features
- 1.7V to 5.25V input voltage range
- 1.2V to 4.8V (in 0.1V step) output voltage range
- 400mA output current
- 9.5μA (typical) supply current
- Ripple rejection
- 90dB (f = 1kHz)
- 85dB (f = 10kHz)
- 65dB (f = 100kHz)
- 8µVRMS output noise (IOUT = 250mA)
- 0.145V (typical) dropout voltage (IOUT = 400mA, VSET = 2.8V)
- +165°C thermal shutdown protection
- 250mA inrush current limit for 700μs period after startup
- 1µF or higher ceramic capacitor
- -40°C to +85°C operating temperature range
- 0.64mm x 0.64mm WLCSP-4-P8 package
- RoHS compliant
Applications
- Mobile phones
- Tablets
- Digital cameras
- Audio devices
- Clock generator components
- Voltage-controlled oscillators (VCOs)
- Phase-locked loop (PLL)
- Battery-powered equipment
- RF modules
- Noise-sensitive devices
- Analog-to-digital converters (ADCs)
- Digital-to-analog converters (DACs)
Block Diagram
Performance Graphs
Low Noise
Importance of High PSRR for CIS
Videos
Additional Resource
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