How do I choose a LDO regulator?
Consider these factors when selecting a voltage regulator:
- Input Voltage and Output Voltage. Ideally, you know the input voltage range and the required output voltage that you will be working with.
- Dropout Voltage.
- Linear Regular or Switching Regulator?
- Device Sensitivity.
- Response Time.
- Power Draw.
What is LDO PSRR?
PSRR is the degree to which an AC element, usually a voltage generated from a switch mode power supply of a certain frequency, is attenuated from the input to the output of the LDO. In other words, it determines how much noise from the input couples into the output.
How is PSRR calculated?
The PSRR can be measured by applying a sinusoidal ripple to the supply voltage and measuring the gain from the input to the output of the regulator. A line injection transformer, such as Picotest’s J2120A, is required to ensure that the injected signal is isolated and does not induce any DC bias.
What are the advantages of a high PSRR LDO regulator?
High PSRR LDO Regulators. Conceived for noise-sensitive and RF applications, this series of high-performance LDO regulators feature remarkable power supply rejection ratio characteristics (up to 92 dB at 1 kHz) and ultra-low noise operation (as low as 6.3 µVRMS) resulting in cleaner and stable output voltages suitable for ultra-sensitive loads.
Why are LDO regulators used in RF applications?
Conceived for noise-sensitive and RF applications, this series of high-performance LDO regulators feature remarkable power supply rejection ratio characteristics (up to 92 dB at 1 kHz) and ultra-low noise operation (as low as 6.3 µVRMS) resulting in cleaner and stable output voltages suitable for ultra-sensitive loads.
Which is the best regulator for DC PSRR?
For the improvement of dc PSRR, a subtractor circuit is introduced along with two stage error amplifier with NMOS mirror load in conventional low drop-out regulator topology. The proposed circuit is simulated using TSMC 0.18μm CMOS technology process parameters.
Which is lp38798 ultra low noise, high PSRR LDO?
LP38798 800-mA Ultra-Low-Noise, High-PSRR LDO datasheet (Rev. F) OUT(FB) 2 3 4 5 6 7 8 1 SET FB GND(CP) CP EN IN(CP) VINVOUT GNDGND CIN CCP COUT R1 R2 LP38798 GND IN IN OUT OUT 9 10 11 12 VEN DAP ON OFF Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design