Overview
The LD2985BM50R is a low dropout (LDO) linear voltage regulator manufactured by STMicroelectronics. This device is part of the LD2985 series, which is known for its ultra-low dropout voltage and low quiescent current, making it particularly suitable for low noise, low power applications, and in battery-powered systems. The LD2985BM50R provides a fixed output voltage of 5.0V and can supply up to 150 mA of output current. It features a logic-controlled electronic shutdown function and internal current and thermal limiting, ensuring reliable operation over a wide range of conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage (Min) | 2.5 | V |
| Input Voltage (Max) | 16 | V |
| Output Voltage Fixed | 5.0 | V |
| Dropout Voltage (Max) | 350 mV | mV |
| Output Current (Max) | 150 mA | mA |
| Tolerance (%) | ±2.5% | % |
| Operating Temperature Range | -40°C to +125°C | °C |
| Regulator Topology | Fixed | |
| Quiescent Current | 4000 µA | µA |
| No. of Outputs | Single | |
| Output Noise | 30 µV | µV |
| Line Regulation (%) | 0.032% | % |
| Package Style | SOT-23-5 (SOT-25) | |
| Mounting Method | Surface Mount |
Key Features
- Ultra-low dropout voltage: 280 mV at 150 mA and 7 mV at 1 mA load.
- Low quiescent current: 2 mA typical at 150 mA load and 80 µA at no load.
- Logic-controlled electronic shutdown: Allows for the device to be put into a standby mode, reducing total power consumption.
- Internal current and thermal limiting: Ensures safe operation by preventing overheating and excessive current draw.
- Low output noise voltage: 30 µVrms, making it suitable for low noise applications.
- Small package: SOT23-5L, ideal for space-constrained designs.
- Wide operating temperature range: -40°C to +125°C.
- External capacitor for noise reduction: A 10 nF capacitor connected between the bypass pin and GND reduces noise to 30 µVrms.
Applications
The LD2985BM50R is suitable for a variety of applications, including:
- Cellular phones
- Palmtop and laptop computers
- Personal digital assistants (PDAs)
- Personal stereos
- Camcorders and cameras
- Battery-powered systems where low noise and low power consumption are critical.
Q & A
- What is the output voltage of the LD2985BM50R?
The output voltage of the LD2985BM50R is fixed at 5.0V.
- What is the maximum output current of the LD2985BM50R?
The maximum output current is 150 mA.
- What is the dropout voltage of the LD2985BM50R?
The dropout voltage is 280 mV at 150 mA and 7 mV at 1 mA load.
- What is the quiescent current of the LD2985BM50R?
The quiescent current is 2 mA typical at 150 mA load and 80 µA at no load.
- Does the LD2985BM50R have a shutdown function?
- What is the operating temperature range of the LD2985BM50R?
The operating temperature range is -40°C to +125°C.
- What package style does the LD2985BM50R come in?
The package style is SOT-23-5 (SOT-25).
- How can the output noise be reduced in the LD2985BM50R?
An external 10 nF capacitor connected between the bypass pin and GND reduces the noise to 30 µVrms.
- What are some typical applications of the LD2985BM50R?
Typical applications include cellular phones, palmtop and laptop computers, personal digital assistants (PDAs), personal stereos, camcorders, and cameras.
- Does the LD2985BM50R have internal current and thermal limiting?
