Low Dropout Regulator (LDO) is a linear regulator that can output stable low voltage DC even with minimal voltage difference between input and output. The core advantages are extremely low noise, simple circuit, and no EMI, designed specifically for batteries and noise sensitive circuits.
Features:
1. Extremely low voltage difference
Stabilize voltage even when the battery is almost depleted, maximizing battery life
2. Ultra low noise, high PSRR
No switch action, ripple often * *<10 μ Vrms * *; PSRR 60~80dB， Powerful filtering of power noise
3. Minimalist Circuit Design
Usually only 2 capacitors are needed for input/output, with no inductance, no EMI, and a small PCB area
4. Fast transient response
Microsecond level response to load jump, with minimal voltage overshoot/undershoot
5. Low cost and easy to use
Fixed voltage versions (3.3V/5.0V) do not require external resistors
Applications：
1. Battery powered equipment
Mobile phones, watches TWS、 Remote control: 5V → 3.3V, 3.7V → 1.8V, extending battery life
2. Noise sensitive circuit
RF radio frequency, WiFi/Bluetooth, audio codec, ADC/DAC, precision sensors: providing pure power supply
3. Post stage filtering/secondary voltage stabilization
Add LDO after DC-DC output to further reduce noise and supply power to analog/RF
4. Low voltage power supply for digital core
MCU/FPGA core (1.0V/1.2V/1.8V): High voltage accuracy and good transient performance
5. Automotive Electronics/Industry
Vehicle mounted instruments and sensors: wide voltage, anti-interference, low static current
