LP3980S: 500mA Ultra-Low Noise LDO Regulator for Portable Wireless Devices
What is the LP3980S?
The LP3980S is a high-performance low-dropout (LDO) regulator engineered for portable electronics. Its core specifications highlight its superiority:
Input Voltage Range: 1.6V to 5.5V, making it compatible with various battery types.
Output Current: Up to 500mA, sufficient to power critical components in compact devices.
Ultra-Low Noise: 100µVRMS (10Hz to 100kHz), ideal for noise-sensitive RF and audio applications.
Low Quiescent Current: 20µA in operation, with <0.03µA in shutdown mode, maximizing battery life.
Fast Response: Turn-on time <50µs and ultra-fast line/load transient response, ensuring stable power during sudden changes.
Protection Features: Includes current limiting and thermal shutdown (activating at 150°C) to enhance system reliability.
Who Benefits from the LP3980S?
This regulator targets engineers and manufacturers developing portable devices where power efficiency, noise reduction, and miniaturization are critical. Key users include:
Designers of cellular/smartphones and portable media players (MP3 players).
Developers of LCD displays, DSC sensors, and wireless cards.
Any team building battery-powered devices requiring stable, low-noise power in a compact form factor.
Where Can It Be Used?
The LP3980S thrives in space-constrained, battery-powered environments. Its small SOT23-5 package (occupying minimal board space) and compatibility with low-ESR ceramic capacitors (reducing component size) make it perfect for:
Handheld wireless devices.
Portable consumer electronics.
IoT sensors and wearables.
Why Choose the LP3980S?
Its competitive edge lies in addressing portable device pain points:
Extended Battery Life: Low quiescent current (even in dropout mode) and minimal shutdown current (<0.03µA) prolong battery runtime.
Superior Noise Performance: Ultra-low output noise and high PSRR (-76dB at 1kHz) protect sensitive RF circuits.
Space Efficiency: Works with low-ESR ceramic capacitors (1µF input/output) and comes in a tiny SOT23-5 package, saving board space.
Robust Operation: Thermal shutdown and current limiting prevent damage from overheating or overloading.
How to Implement the LP3980S?
For optimal performance:
External Capacitors: Use ≥1µF ceramic capacitors for input (placed <0.5 inches from VIN) and output (ESR >25mΩ, placed <0.5 inches from VOUT) to ensure stability.
Enable Function: Activate with EN ≥1.4V; shut down with EN ≤0.4V. Tie EN to VIN for continuous operation.
Thermal Management: Stay within 125°C maximum junction temperature to avoid thermal shutdown (calculated via (PD(MAX)} = (TJ – TA)/θJA, with θJA = 250°C/W for (SOT23-5).
For detailed specs, visit https://www.ablsemi.com Or contact info@ablsemi.com.
The LP3980S: Powering the next generation of portable wireless devices.
