Overview
The L4971D, produced by STMicroelectronics, is a step-down monolithic power switching regulator designed to deliver up to 1.5A of current. This device operates within a wide input voltage range of 8V to 55V and can regulate output voltages from 3.3V to 50V, making it versatile for various applications. Realized in BCD mixed technology, the L4971D utilizes an internal power D-MOS transistor with a typical Rdson of 0.25Ω, ensuring high efficiency and high switching speeds. The device is available in SO16W packages for surface mount assembly, catering to both standard and SMD requirements.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 8V to 55V | V |
| Output Voltage Range | 3.3V to 50V | V |
| Maximum Output Current | 1.5A | A |
| Switching Frequency | Up to 300KHz | Hz |
| Internal Reference Voltage | 3.3V (±1%) | V |
| Package Types | DIP8, SO16W | - |
| Operating Temperature Range | -40°C to 125°C | °C |
Key Features
- Pulse-by-pulse current limit and hiccup mode for short circuit protection
- Voltage feedforward regulation
- Soft-start function
- Protection against feedback loop disconnection
- Inhibit for zero current consumption
- Thermal shutdown
- Zero load current operation
- Precise 3.3V (±1%) internal reference voltage
- Adjustable switching frequency up to 300KHz
Applications
The L4971D is suitable for a wide range of applications due to its adjustable output voltage and high efficiency. It is commonly used in power supply systems, DC-DC converters, and other electronic devices that require stable and efficient power regulation. The device's ability to handle a wide input voltage range and its various protection features make it ideal for use in industrial, automotive, and consumer electronics.
Q & A
- What is the maximum output current of the L4971D?
The maximum output current of the L4971D is 1.5A.
- What is the input voltage range of the L4971D?
The input voltage range of the L4971D is from 8V to 55V.
- What are the available package types for the L4971D?
The L4971D is available in DIP8 and SO16W packages.
- What is the switching frequency range of the L4971D?
The switching frequency of the L4971D is adjustable up to 300KHz.
- Does the L4971D have built-in protection features?
Yes, the L4971D includes features such as pulse-by-pulse current limit, hiccup mode for short circuit protection, thermal shutdown, and protection against feedback loop disconnection.
- What is the internal reference voltage of the L4971D?
The internal reference voltage of the L4971D is 3.3V (±1%).
- Can the output voltage of the L4971D be adjusted?
Yes, the output voltage of the L4971D can be adjusted from 3.3V to 50V using an external resistive divider.
- Does the L4971D support soft-start functionality?
Yes, the L4971D includes a soft-start function to manage startup currents.
- What is the operating temperature range of the L4971D?
The operating temperature range of the L4971D is from -40°C to 125°C.
- Is the L4971D RoHS compliant?
Yes, the L4971D is RoHS compliant.
- What are some common applications of the L4971D?
The L4971D is commonly used in power supply systems, DC-DC converters, industrial, automotive, and consumer electronics.
