Overview
The LP2985-33DBVR is a fixed-output, wide-input, low-noise, low-dropout voltage regulator produced by Texas Instruments. This regulator supports an input voltage range from 2.5 V to 16 V and can supply up to 150 mA of load current. It is designed to provide a stable output voltage with high accuracy, making it suitable for low-voltage microcontrollers (MCUs) and processors. The LP2985-33DBVR features low output noise and high power supply rejection ratio (PSRR), which helps in minimizing post-regulator filtering and attenuating the switching frequency of upstream DC/DC converters.
Key Specifications
| Specification | Value |
|---|---|
| Input Voltage Range | 2.5 V to 16 V |
| Output Voltage Range | 1.2 V to 5.0 V (fixed, 100-mV steps) |
| Output Current | Up to 150 mA |
| Output Accuracy | ±0.5% for new chip, ±1% for A-grade legacy chip, ±1.5% for standard-grade legacy chip |
| Quiescent Current (IQ) | 71 µA at ILOAD = 0 mA, 750 µA at ILOAD = 150 mA |
| Shutdown Current | 0.01 µA (typ) for legacy chip, 1.12 µA (typ) for new chip |
| Output Noise | 30 µV RMS with 10-nF bypass capacitor |
| PSRR | 70 dB at 1 kHz, 40 dB at 1 MHz |
| Operating Junction Temperature | –40°C to +125°C |
| Package | 5-pin SOT-23 (DBV) |
Key Features
- Low noise: 30 µV RMS with a 10-nF bypass capacitor.
- High PSRR: 70 dB at 1 kHz and 40 dB at 1 MHz.
- Output current limiting and thermal protection.
- Stable with 2.2-µF ceramic capacitors.
- Internal soft-start time and current limit protection to reduce inrush current during startup.
- Low quiescent current: 71 µA at ILOAD = 0 mA and 750 µA at ILOAD = 150 mA.
- Shutdown feature with low shutdown current.
- High output accuracy: ±0.5% for the new chip.
Applications
- Washer and dryer systems.
- Land mobile radio systems.
- Active antenna systems and mMIMO (Massive Multiple-Input Multiple-Output) systems.
- Cordless power tools.
- Motor drives and control boards.
Q & A
- What is the input voltage range of the LP2985-33DBVR?
The input voltage range is from 2.5 V to 16 V.
- What is the maximum output current of the LP2985-33DBVR?
The maximum output current is up to 150 mA.
- What is the output voltage accuracy of the LP2985-33DBVR?
The output voltage accuracy is ±0.5% for the new chip, ±1% for A-grade legacy chips, and ±1.5% for standard-grade legacy chips.
- What is the quiescent current (IQ) of the LP2985-33DBVR?
The quiescent current is 71 µA at ILOAD = 0 mA and 750 µA at ILOAD = 150 mA.
- What is the shutdown current of the LP2985-33DBVR?
The shutdown current is 0.01 µA (typ) for legacy chips and 1.12 µA (typ) for new chips.
- What is the output noise of the LP2985-33DBVR?
The output noise is 30 µV RMS with a 10-nF bypass capacitor.
- What is the PSRR of the LP2985-33DBVR?
The PSRR is 70 dB at 1 kHz and 40 dB at 1 MHz.
- What is the operating junction temperature range of the LP2985-33DBVR?
The operating junction temperature range is –40°C to +125°C.
- What package type is the LP2985-33DBVR available in?
The LP2985-33DBVR is available in a 5-pin SOT-23 (DBV) package.
- What are some common applications of the LP2985-33DBVR?
Common applications include washer and dryer systems, land mobile radio systems, active antenna systems, cordless power tools, and motor drives and control boards.
