LP3988-18
Low noise 1.8V LDO with 150mA output current for digital core supply applications
Product Overview
Description
The LP3988-18 is a low noise LDO regulator designed for digital core supply applications. It provides a fixed 1.8V output voltage with up to 150mA output current capability, making it ideal for powering microcontrollers, digital signal processors, and memory chips.
The device features a low quiescent current of 50μA and excellent line regulation of ±0.2%/V. The fast transient response ensures stable output voltage during sudden load changes. With a dropout voltage of only 180mV at 150mA, it can maintain regulation even with low input voltages.
The LP3988-18 includes current limit and thermal shutdown protection. The enable pin allows power sequencing in multi-rail systems. Available in a compact SOT-23-5 package, it is perfect for portable electronics and battery-powered devices.
Product Series
LP
Primary Application
Microcontroller core supply
Key Features
- Low 50μA quiescent current
- 150mA maximum output current
- Low 180mV dropout voltage
- 65dB PSRR at 1kHz
- Enable pin for power control
- Current limit protection
- Thermal shutdown protection
- Compact SOT-23-5 package
Specifications
| Output Voltage | 1.8V (fixed) |
|---|---|
| Output Current | 150mA max |
| Quiescent Current | 50μA (typical) |
| Dropout Voltage | 180mV @ 150mA |
| PSRR | 65dB @ 1kHz |
| Input Voltage Range | 2.3V - 5.5V |
| Load Regulation | ±1% |
| Line Regulation | ±0.2%/V |
| Operating Temperature | -40°C to +85°C |
| Package | SOT-23-5 |
| Output Noise | 30μVRMS |
Applications
Microcontroller core supply
Industrial automation and control
DSP power supply
Power conversion and supply
Memory chip power
Electronic system design
Portable electronics
Electronic system design
Battery-powered devices
Battery and charging management
FAE Expert Insights
"The LP3988-18 is an excellent choice for digital core supply applications. The 1.8V output is perfect for modern low-power microcontrollers and DSPs. I've used this LDO in numerous designs where a clean, stable 1.8V rail is critical for digital logic. The 50μA quiescent current is reasonable for always-on applications, and the 180mV dropout allows operation even when the battery is nearly depleted. The enable pin is useful for power sequencing - I typically connect it to the 3.3V rail to ensure the 1.8V core comes up after the I/O voltage. One implementation tip: place a 1μF ceramic capacitor close to the output pin for best transient response. The thermal protection works well - I've seen it save designs during fault conditions. Overall, a reliable LDO for digital applications at a competitive price."
Low noise 1.8V LDO ideal for microcontroller and DSP core supply applications
— Dr. Wang Li, BeiLuo
Frequently Asked Questions
What is the dropout voltage of LP3988-18?
The LP3988-18 has a dropout voltage of 180mV at the maximum 150mA output current. This low dropout allows the regulator to maintain regulation even when the input voltage is close to the output voltage, extending usable battery life.
180mV dropout suitable for battery applications; verify input voltage margin.