The RTQ2521A is a high-current (1.5A), low-noise (7μVRMS), high accuracy (1% over line, load, and temperature), low-dropout linear regulator (LDO) capable of sourcing 1.5A with extremely low dropout (max. 110mV). The device supports single input supply voltage as low to 1.1V that makes it easy to use.

The low noise, high PSRR and high output current capability makes the RTQ2521A ideal to power noise-sensitive devices such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and RF components. With very high accuracy, remote sensing, and soft-start capabilities to reduce inrush current, the RTQ2521A is ideal for powering digital loads such as FPGAs, DSPs, and ASICs.

The external enable control and power good indicator function makes the sequence control easier. The output noise immunity is enhanced by adding external bypass capacitor on NR/SS pin. The device is fully specified over the temperature range of TJ = -40°C to 125°C and is offered in the WDFN-8EL 3x3 package.


  • Portable Electronic Device
  • Wireless Infrastructure : SerDes, FPGA, DSP
  • RF, IF Components : VCO, ADC, DAC, LVDS
Key Spec.
Status Active
Vin (min) (V) 1.1
Vin (max) (V) 6.5
Vout (min) (V) 0.5
Vout (max) (V) 5.5
Output Adj. Method Resistor
Accuracy (+/- %) 1.5
Iout (max) (mA) 1500
Iq (typ) (uA) 3700
Vdropout @ rated current (typ) (mV) 110 @ 1.5A
Bias Rail No
Cout Type Ceramic
Charge Pump Yes
Features Adjustable Soft-Start;Enable Input;Extra Low Noise;High PSRR;Low Dropout;OCP;Output Discharge;Power Good;Stable with Ceramic Capacitor
Package Type WDFN3x3-8E
  • Input Voltage Range : 1.1V to 6.5V
  • Output Voltage Range : 0.5V to 5.5V
  • Accurate Output Voltage Accuracy (1%) Over Line, Load and Temperature
  • Ultra High PSRR : 38dB at 500kHz
  • Excellent Noise Immunity
    ► 7μVRMS at 0.5V Output
    ► 10μVRMS at 3.3V Output
  • Ultra Low Dropout Voltage : 110mV at 1.5A
  • Enable Control
  • Programmable Soft-Start Output
  • Stable with a 10μF or Larger Ceramic Output Capacitor
  • Support Power-Good Indicator Function
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
1.5A, 6.5V, Ultra Low Noise, Ultra Low Dropout Linear Regulator2021/03/23