3A, 6.5V, Ultra Low Noise, Ultra Low Dropout Linear Regulator


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The RTQ2503S is a high-current (3A), low-noise (4.4μVRMS), high accuracy (1% over line, load, and temperature), low-dropout linear regulator (LDO) capable of sourcing 3A with extremely low dropout (max. 180mV). The device output voltage is pin-selectable (up to 3.95V) using a PCB layout without the need of external resistors, thus reducing overall component count. Designers can achieve higher output voltage with the use of external resistor divider. 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 RTQ2503S 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 RTQ2503S 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 a WQFN-20L 3.5x3.5 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) 0.8
Vout (max) (V) 5.5
Output Adj. Method Resistor
Accuracy (+/- %) 1
Iout (max) (mA) 3000
Iq (typ) (uA) 4200
Vdropout @ rated current (typ) (mV) 110 @ 3A
Cout Type Ceramic
Features Adjustable Soft-Start;Enable Input;Extra Low Noise;High PSRR;Low Dropout;OCP;OCP;Power Good;Stable with Ceramic Capacitor
Package Type WQFN3.5x3.5-20
  • Input Voltage Range : 1.1V to 6.5V
  • Two Output Voltage Modes
    ► 0.8 V to 5.5V (Set by a Resistive Divider)
    ► 0.8 V to 3.95V (Set via PCB Layout, No External Resistor Required)
  • Accurate Output Voltage Accuracy (1%) Over Line, Load and Temperature
  • Ultra High PSRR : 40dB at 500kHz
  • Excellent Noise Immunity
    ► 4.4μVRMS at 0.8V Output
    ► 7.7μVRMS at 5.0V Output
  • Ultra Low Dropout Voltage : 180mV at 3A
  • Enable Control
  • Programmable Soft-Start Output
  • Stable with a 47μF or Larger Ceramic Output Capacitor
  • Support Power-Good Indicator Function
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
3A, 6.5V, Ultra Low Noise, Ultra Low Dropout Linear Regulator2018/03/05
Evaluation Boards
TitleLast UpdateShareDownload
3A, 6.5V, Ultra Low Noise, Ultra Low Dropout Linear Regulator2018/11/08