Specifications
| Attribute | Value |
| Package / Case | Tube |
| Part Status | Active |
| Function | Step-Down |
| Output Configuration | Positive |
| Topology | Buck |
| Output Type | Adjustable |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 8V |
| Voltage - Input (Max) | 55V |
| Voltage - Output (Min/Fixed) | 3.3V |
| Voltage - Output (Max) | 50V |
| Current - Output | 1.5A |
| Frequency - Switching | 100kHz ~ 300kHz |
| Synchronous Rectifier | No |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Mounting Type | Through Hole |
Overview
Description
L4971 is a part number used by several vendors; the best-known reference is STMicroelectronics’ L4971, an automotive buck regulator. It is an integrated switching regulator (controller plus power MOSFET) designed to derive a stable low-voltage rail from a wide automotive input. It uses a high-efficiency switching scheme (PWM/PFM), requires only a few external components (inductor, diode, output capacitor), and includes protections such as overcurrent, overtemperature, undervoltage, and an enable control. It’s commonly used in car electronics like ECUs, instrument clusters, sensors, and LED drivers.
If you meant a different manufacturer’s L4971 or need exact specs (pinout, package, voltage range, current capability), please specify the maker or application and I’ll give a precise, concise intro.
If you meant a different manufacturer’s L4971 or need exact specs (pinout, package, voltage range, current capability), please specify the maker or application and I’ll give a precise, concise intro.
Pinout
Pin count: 8 pins (8-pin package, e.g., SO-8).
Function: ST L4971 is an automotive high-side switch with built-in current limiting and protection (thermal shutoff/overload protection, undervoltage lockout) used to drive loads from a battery.
Function: ST L4971 is an automotive high-side switch with built-in current limiting and protection (thermal shutoff/overload protection, undervoltage lockout) used to drive loads from a battery.
Manufacturer
- Manufacturer: STMicroelectronics (ST)
- What kind of company: A Franco-Italian multinational semiconductor company that designs, develops, and manufactures a wide range of integrated circuits, discrete devices, sensors, and automotive ICs for electronics applications.
- What kind of company: A Franco-Italian multinational semiconductor company that designs, develops, and manufactures a wide range of integrated circuits, discrete devices, sensors, and automotive ICs for electronics applications.
Application
Typical application areas for L4971:
- Automotive electronics: power rails for ECUs, sensors, actuators, battery regulation
- Industrial and automation: DC-DC converters and front-end power supplies for controllers and drives
- Consumer electronics: power management rails in TVs, set-top boxes, audio gear
- Telecom and networking: standby and main power supplies for routers, base stations
- Medical portable devices: battery-powered instruments requiring robust regulation
Note: L4971 is used as a high-efficiency voltage regulator in these power-management roles.
- Automotive electronics: power rails for ECUs, sensors, actuators, battery regulation
- Industrial and automation: DC-DC converters and front-end power supplies for controllers and drives
- Consumer electronics: power management rails in TVs, set-top boxes, audio gear
- Telecom and networking: standby and main power supplies for routers, base stations
- Medical portable devices: battery-powered instruments requiring robust regulation
Note: L4971 is used as a high-efficiency voltage regulator in these power-management roles.
Package
ST L4971 is a power regulator; the common package is Multiwatt-15. Some variants are offered in TO-220AB or D²PAK depending on the revision.
