AW3710
Awinic AW3710 ultra-low noise LDO for RF and analog circuits with high PSRR and fast transient response.
Product Overview
Description
The AW3710 is an ultra-low noise LDO regulator designed for noise-sensitive applications such as RF circuits, analog sensors, and audio systems.
This device delivers up to 300mA output current with exceptional noise performance of only 20μVRMS and high PSRR of 75dB at 1kHz.
The fast transient response ensures stable voltage during sudden load changes, critical for RF power amplifiers and digital circuits.
Product Series
AW
Primary Application
RF power amplifier supply
Key Features
- Ultra-low output noise 20μVRMS
- High PSRR 75dB at 1kHz
- Fast transient response
- Low dropout voltage 150mV @ 300mA
- Stable with small ceramic capacitors
- Thermal and current protection
Specifications
| Input Voltage | 1.8V - 5.5V |
|---|---|
| Output Voltage | 1.2V - 3.3V (fixed/adj) |
| Output Current | 300mA |
| Noise | 20μVRMS (10Hz-100kHz) |
| PSRR | 75dB @ 1kHz |
| Package | SOT-23-3, WLCSP-4 |
Applications
RF power amplifier supply
Electronic system design
Audio codec power
Electronic system design
Camera sensor power
Sensor signal conditioning
Precision ADC/DAC supply
Data acquisition and conversion
Clock and PLL power
Electronic system design
FAE Expert Insights
"The AW3710 is my go-to LDO for noise-sensitive applications. The 20μVRMS noise figure is exceptional - I've measured it at 18μV in typical conditions, which is better than many premium competitors. The high PSRR is particularly valuable for RF applications where switching noise from buck converters can cause interference. I've used this LDO successfully for camera sensor power, audio codec supply, and RF PA bias. The fast transient response prevents voltage droop during sudden current demands, which is critical for RF power amplifiers that draw pulsed current. The small WLCSP-4 package is perfect for space-constrained smartphone designs. I recommend placing a 1μF ceramic capacitor close to the output for best noise performance. Overall, an excellent low-noise LDO at a competitive price point."
Ultra-low noise and high PSRR ideal for RF and analog applications
— David Chen, BeiLuo
Frequently Asked Questions
How low is the output noise of AW3710?
The AW3710 achieves ultra-low output noise of 20μVRMS (typical) measured over 10Hz to 100kHz bandwidth. This is among the lowest noise levels for LDOs in its class. The low noise is achieved through: Careful bandgap reference design with filtering. Internal noise reduction circuitry. Optimized error amplifier design. For comparison, typical general-purpose LDOs have 50-100μV noise, while premium ultra-low noise LDOs can achieve <10μV. The AW3710 strikes an excellent balance between noise performance and cost. For even lower noise, additional output filtering can be added.
What is PSRR and why is it important?
PSRR (Power Supply Rejection Ratio) measures how well the LDO rejects noise and ripple from the input supply. The AW3710 achieves 75dB PSRR at 1kHz, meaning it attenuates input ripple by a factor of 5600x (75dB = 20*log(5600)). High PSRR is important when: The input supply comes from a noisy buck converter. Powering RF circuits where switching noise can cause interference. Supplying analog sensors where ripple affects measurement accuracy. Driving audio circuits where power supply noise becomes audible. The AW3710 maintains high PSRR across a wide frequency range, providing effective noise rejection for most applications.
What capacitors should I use with AW3710?
The AW3710 is stable with small ceramic capacitors, simplifying BOM and reducing size: Input capacitor: 1μF ceramic for high-frequency bypassing. Output capacitor: 1μF ceramic minimum, 2.2-4.7μF recommended for best transient response. Capacitor type: X5R or X7R ceramic with low ESR. Placement: Place capacitors as close as possible to the pins. For lowest noise performance: Add a 10nF ceramic capacitor in parallel with the main output capacitor. Use a small ferrite bead in series with the input for high-frequency filtering. These recommendations ensure stable operation with excellent noise performance.
How do I select the output voltage?
The AW3710 is available in fixed output voltage versions (1.2V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V) and adjustable versions. Fixed voltage versions: Simplest implementation - no external resistors needed. Factory-trimmed for accuracy. Recommended for standard voltages. Adjustable versions: Set voltage with external resistor divider. Formula: Vout = 0.5V × (1 + R1/R2). Allows custom voltages and future adjustment. Select output voltage based on: Load circuit requirements (check datasheet for recommended supply). Input voltage availability (must have adequate headroom). Power consumption considerations (lower voltage reduces power).
What is the dropout voltage?
Dropout voltage is the minimum input-to-output voltage differential required for the LDO to maintain regulation. The AW3710 has low dropout voltage of 150mV at 300mA load, meaning: For 3.3V output, input must be at least 3.45V. For 1.8V output, input must be at least 1.95V. Low dropout is important for: Battery-powered applications where input voltage drops as battery discharges. Efficient operation with minimal power loss in the LDO. Extending battery life by utilizing more of the battery capacity. The dropout voltage increases with load current - at light loads, dropout may be only 50-100mV.