Overview
The LD2985BM28R is a low-dropout voltage regulator produced by STMicroelectronics. This component is part of the LD2985 series, known for its ultra-low dropout voltage and low quiescent current, making it particularly suitable for low noise, low power applications, and battery-powered systems. The LD2985BM28R provides a fixed output voltage of 2.8V and can supply up to 150 mA of output current. It features a logic-controlled electronic shutdown, internal current and thermal limits, and low output noise voltage. The device is available in a small SOT23-5L package and operates over a temperature range of -40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 2.8 | V |
| Output Current | Up to 150 | mA |
| Dropout Voltage | 280 mV at 150 mA, 7 mV at 1 mA | mV |
| Quiescent Current | 2 mA typ. at 150 mA load, 80 µA at no load | mA/µA |
| Operating Input Voltage | 2.5 to 16 | V |
| Operating Junction Temperature | -40 to 125 | °C |
| Thermal Resistance Junction-Case | 81 | °C/W |
| Thermal Resistance Junction-Ambient | 255 | °C/W |
| Output Noise Voltage | 30 µVrms | µVrms |
| Package Type | SOT23-5L |
Key Features
- Very low dropout voltage (280 mV at 150 mA and 7 mV at 1 mA load)
- Very low quiescent current (2 mA typ. at 150 mA load and 80 µA at no load)
- Logic-controlled electronic shutdown
- Internal current and thermal limits
- Low output noise voltage (30 µVrms)
- Small package (SOT23-5L)
- Wide operating temperature range (-40°C to 125°C)
- Inhibit function to reduce power consumption to less than 1 µA in sleep mode
Applications
The LD2985BM28R is suitable for various low power and low noise applications, including:
- Cellular phones
- Palmtop and laptop computers
- Personal Digital Assistants (PDAs)
- Personal stereos
- Camcorders and cameras
Q & A
- What is the output voltage of the LD2985BM28R?
The output voltage of the LD2985BM28R is 2.8V.
- What is the maximum output current of the LD2985BM28R?
The maximum output current is up to 150 mA.
- What is the dropout voltage of the LD2985BM28R?
The dropout voltage is 280 mV at 150 mA and 7 mV at 1 mA load.
- What is the quiescent current of the LD2985BM28R?
The quiescent current is 2 mA typical at 150 mA load and 80 µA at no load.
- How does the inhibit function work on the LD2985BM28R?
The inhibit function allows the regulator to be turned off by pulling the INHIBIT pin low, reducing the current consumption to less than 1 µA.
- What type of package is the LD2985BM28R available in?
The LD2985BM28R is available in a SOT23-5L package.
- What is the operating temperature range of the LD2985BM28R?
The operating temperature range is -40°C to 125°C.
- What is the output noise voltage of the LD2985BM28R?
The output noise voltage is 30 µVrms.
- What are some typical applications for the LD2985BM28R?
Typical applications include cellular phones, palmtop and laptop computers, PDAs, personal stereos, camcorders, and cameras.
- What are the thermal resistance values for the LD2985BM28R?
The thermal resistance junction-case is 81°C/W, and the thermal resistance junction-ambient is 255°C/W.
