XZ1001
300mA ultra-low noise LDO regulator with 8μVrms noise and 75dB PSRR for sensitive RF and analog applications
Product Overview
Description
The XZ1001 is an ultra-low noise LDO regulator designed for noise-sensitive applications such as RF transceivers, precision ADCs, and audio circuits. With output noise of only 8μVrms and PSRR of 75dB at 1kHz, it provides exceptionally clean power.
The device operates from a 2.0V to 5.5V input and delivers up to 300mA output current. It features low dropout voltage of only 150mV at 300mA, making it efficient even with small input-output voltage differentials.
Available in compact SOT-23 and 1.5mm x 1.5mm DFN packages, the XZ1001 is ideal for space-constrained portable devices. It includes thermal shutdown and current limit protection for reliable operation.
Product Series
XZ
Primary Application
RF transceivers
Key Features
- Ultra-low output noise: 8μVrms
- High PSRR: 75dB at 1kHz
- Low dropout voltage: 150mV at 300mA
- Wide input voltage range: 2.0V to 5.5V
- Thermal shutdown protection
- Current limit protection
- Compact packages available
Specifications
| Input Voltage | 2.0V - 5.5V |
|---|---|
| Output Voltage | 1.2V - 3.3V (fixed/adj) |
| Output Current | 300mA |
| Dropout Voltage | 150mV @ 300mA |
| Output Noise | 8μVrms (10Hz-100kHz) |
| PSRR | 75dB @ 1kHz |
| Operating Temperature | -40°C to +85°C |
| Package | SOT-23-5, DFN-6 |
Applications
RF transceivers
Electronic system design
Precision ADCs/DACs
Electronic system design
Audio circuits
Electronic system design
Camera sensors
Sensor signal conditioning
Portable devices
Electronic system design
FAE Expert Insights
"The XZ1001 is my go-to LDO for noise-sensitive applications. The 8μVrms noise figure is excellent for this class of device, and the 75dB PSRR at 1kHz effectively rejects input ripple. I've used this in RF front-end designs where power supply noise directly impacts receiver sensitivity. One important tip: place the output capacitor as close as possible to the LDO pins - this minimizes noise pickup and ensures stability. The dropout voltage is reasonable at 150mV, but if you need lower dropout, consider the XZ1002 variant. Overall, a solid performer for the price point, especially for consumer electronics where noise performance is critical."
Excellent ultra-low noise LDO with 8μVrms noise for RF applications
— David Wang, BeiLuo
Frequently Asked Questions
What is the output noise of XZ1001?
The XZ1001 features ultra-low output noise of 8μVrms over the 10Hz to 100kHz bandwidth. This low noise makes it ideal for powering sensitive RF and analog circuits where power supply noise can degrade performance.
Use XZ1001 for noise-sensitive applications; verify noise specifications meet your circuit requirements.
What is PSRR and why is it important?
PSRR (Power Supply Rejection Ratio) measures how well the LDO rejects noise from the input supply. XZ1001 offers 75dB PSRR at 1kHz, meaning it rejects 99.98% of input ripple at this frequency. High PSRR is important when the input supply has ripple (such as from a switching converter).
High PSRR is critical when using LDO after switching converters; XZ1001 provides excellent ripple rejection.
What dropout voltage can I expect?
XZ1001 has a typical dropout voltage of 150mV at 300mA load. This means the input voltage must be at least 150mV higher than the output voltage for proper regulation. Dropout voltage decreases at lighter loads.
Ensure input voltage has sufficient headroom above output voltage; consider dropout when battery is near end of discharge.
What output capacitor should I use?
XZ1001 is stable with ceramic capacitors of 1μF to 10μF. Use low-ESR ceramic capacitors (X5R or X7R dielectric) for best performance. Place the output capacitor as close as possible to the output pin for optimal noise performance.
Use 4.7μF ceramic capacitor for typical applications; place close to LDO pins for best performance.
Can XZ1001 be used after a switching converter?
Yes, XZ1001 is ideal for post-regulation after switching converters. Its high PSRR effectively filters switching ripple, providing clean power to sensitive circuits. This cascaded approach combines the efficiency of switching converters with the clean output of LDOs.
Use XZ1001 after buck converter for noise-sensitive circuits; high PSRR provides excellent ripple filtering.