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RP122 Series

Low Noise and Low Supply Current 400mA LDO Regulator

  • Consumer
  • PLP
  • RoHS

The RP122 is a LDO regulator that provides low output noise, high ripple rejection and fast response characteristics, achieved by low supply current. This device is suitable not only for noise-sensitive applications such as high-performance analog circuits, but also for various applications.

  • Achieves Low Noise, High PSRR and Fast Response.
  • Provides Saving Space by Adopting of 4-pin Small Package without Noise Bypass Capacitor.
  • Provides Long-Duration of Operation for Battery-powered Equipment by Low Supply Current of 9.5 µA (Typ.), despite the low-noise LDO.

Specs & Datasheets

Input Voltage Range 1.9 V to 5.5 V (6.0 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 9.5 µA
Standby Current Typ. 0.01 μA
Output Voltage Range 1.2 V to 4.8 V (0.1 V step)
Output Voltage Accuracy ±0.8% (Ta = 25°C, VSET ≥ 1.8 V)
Dropout Voltage Typ. 0.145 V (IOUT = 400 mA, VSET = 2.8 V, RP122Z)
Typ. 0.170 V (IOUT = 400 mA, VSET = 2.8 V, RP122K)
Output Current 400 mA
Ripple Rejection Typ. 90 dB (f = 1 kHz)
Typ. 85 dB (f = 10 kHz)
Typ. 65 dB (f = 100 kHz)
Output Noise Voltage Typ. 8 µVrms (IOUT = 250 mA)
Package WLCSP-4-P8, WLCSP-4-P12, DFN(PLP)1010-4

Download Datasheet

Protections / Functions

Functional Description

TSD Reverse Current Limit ISC Inrush Constant Slope ECO mode Auto Discharge External Driver

Technical Documents

Ripple Rejection vs. Frequency

Ripple Rejection vs. Frequency

VSET=2.8 V, VIN=3.8 V, COUT=Ceramic 1.0 µF, Ripple=0.2 Vp-p

High Ripple Rejection Demonstration

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
  • plpP
WLCSP-4-P8 RP122Zxx1 RP122Z-F
  • gradeConsumerC
WLCSP-4-P12 RP122Zxx3 RP122Zxx3-F
  • gradeConsumerC
  • plpP
DFN(PLP)1010-4 RP122K RP122K

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

TSD Thermal Shutdown Function
Reverse Current Protection Reverse Current Protection
Current Limit Overcurrent Protection
ISC Short Current Protection
Inrush Current Limit Inrush Current Protection
Constant Slope Constant Slope Function
ECO mode ECO Function
Auto Discharge Auto Discharge Function
External Driver External Output Driver Transistor

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Functions ECO mode,Auto Discharge