JW5220
High PSRR LDO with 500mA output for powering noise-sensitive RF and analog circuits
Product Overview
Description
The JW5220 is a high-performance low-dropout regulator designed for noise-sensitive applications. It delivers up to 500mA output current with excellent line and load regulation. The device features high PSRR (70dB at 1kHz), making it ideal for powering RF circuits, ADCs, and precision analog circuits.
The LDO operates from 2.5V to 5.5V input and provides fixed output voltages from 1.2V to 3.3V. The low 200mV dropout voltage at 500mA allows operation with minimal headroom. The fast transient response handles load steps with minimal output voltage variation.
The JW5220 includes current limit protection, thermal shutdown, and reverse current protection. The enable pin allows power sequencing and shutdown control. Available in compact SOT-23-5 and SOT-89 packages.
Product Series
JW
Primary Application
RF power supplies
Key Features
- High 70dB PSRR at 1kHz
- 500mA maximum output current
- Low 200mV dropout voltage
- Low 50μVRMS output noise
- Fast transient response
- Current limit protection
- Thermal shutdown
- Enable pin for power control
Specifications
| Input Voltage Range | 2.5V - 5.5V |
|---|---|
| Output Voltage | 1.2V - 3.3V (fixed) |
| Output Current | 500mA max |
| Dropout Voltage | 200mV @ 500mA |
| PSRR | 70dB @ 1kHz |
| Output Noise | 50μVRMS |
| Quiescent Current | 100μA |
| Load Regulation | ±1% |
| Operating Temperature | -40°C to +125°C |
| Package | SOT-23-5, SOT-89 |
Applications
RF power supplies
Electronic system design
ADC/DAC power
Data acquisition and conversion
Precision analog circuits
Electronic system design
Post-regulation
Power conversion and supply
Noise-sensitive systems
Electronic system design
FAE Expert Insights
"The JW5220 is my go-to LDO for noise-sensitive applications. The 70dB PSRR at 1kHz is excellent for this class of LDO - I've used it to power 16-bit ADCs in precision measurement systems with great results. The 50μVRMS noise floor is low enough for most RF applications. One thing I really appreciate is the fast transient response - it handles load steps from 10mA to 500mA with minimal undershoot. The dropout voltage of 200mV at full load is competitive, allowing operation even with small input-output differentials. One design tip: use a 2.2μF or larger ceramic output capacitor for best PSRR and transient performance. Place the capacitor as close as possible to the output pin. The SOT-23-5 package is compact but can handle the thermal load if you have adequate copper area. For higher current or better thermal performance, use the SOT-89 package. Overall, an excellent high-PSRR LDO at a competitive price."
High PSRR LDO with low noise for sensitive RF and analog applications
— Jennifer Park, BeiLuo
Frequently Asked Questions
What is the PSRR of JW5220?
The JW5220 features 70dB PSRR at 1kHz, which provides excellent rejection of input power supply noise and ripple. This high PSRR makes it suitable for powering noise-sensitive circuits such as RF modules, precision ADCs, and audio codecs where power supply quality directly impacts performance.
70dB PSRR excellent for noise-sensitive applications; verify PSRR at your specific noise frequencies.
What is the dropout voltage of JW5220?
The JW5220 has a dropout voltage of 200mV at the maximum 500mA output current. This low dropout allows the regulator to maintain regulation even when the input voltage is close to the output voltage. For lighter loads, the dropout voltage is proportionally lower.
200mV dropout at 500mA; ensure adequate input voltage margin for your application.
What output capacitor should I use?
For optimal performance, use a 2.2μF or larger ceramic capacitor (X5R or X7R dielectric) on the output. Place the capacitor as close as possible to the output pin. Larger capacitance improves PSRR and transient response. ESR should be low (ceramic capacitors preferred) for best stability and noise performance.
Use 2.2μF or larger ceramic capacitor close to output pin; X5R/X7R dielectric.
Is JW5220 suitable for RF applications?
Yes, the JW5220 is well-suited for RF applications due to its high PSRR (70dB) and low output noise (50μVRMS). These characteristics ensure clean power supply for RF circuits, minimizing phase noise and spurious emissions. The fast transient response also handles the varying loads typical of RF transmitters.
Excellent for RF applications; high PSRR and low noise ensure clean power for sensitive circuits.
What is the quiescent current of JW5220?
The JW5220 has a quiescent current of 100μA typical. While this is higher than ultra-low power LDOs, it is reasonable for a high PSRR device. For battery-powered applications where quiescent current is critical, consider whether the improved noise performance justifies the higher current consumption.
100μA quiescent current; trade-off for high PSRR performance.
Does JW5220 have an enable pin?
Yes, the JW5220 includes an active-high enable pin that allows power sequencing and shutdown control. When disabled, the LDO enters low-power mode with reduced quiescent current. The enable pin has internal pull-down to ensure the LDO is off when the pin is floating.
Enable pin useful for power sequencing; active-high with internal pull-down.
What protection features does JW5220 include?
The JW5220 includes current limit protection to prevent damage during output shorts, thermal shutdown to protect against overheating, and reverse current protection to prevent damage when output voltage exceeds input voltage. These features ensure robust operation under fault conditions.
Built-in protections ensure robust operation; thermal shutdown activates at approximately 160°C.