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L4971

Name: L4971
Rating: 4.7 (12 reviews)

IC REG BUCK ADJUSTABLE 1.5A 8DIP

製造商
製造商。部分 #L4971
包 PDIP-8
資料表 L4971 DataSheet
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規格

Package	Tube
ProductStatus	Active
Function	Step-Down
OutputConfiguration	Positive
Topology	Buck
OutputType	Adjustable
NumberofOutputs	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
SynchronousRectifier	No
OperatingTemperature	-40°C ~ 150°C (TJ)
MountingType	Through Hole
Package/Case	8-DIP (0.300, 7.62mm)

概述

Description

L4971 is not a single universal device—it's a part-number used by several vendors. The best-known version is a DC-DC buck switching-reg regulator controller.
- Type: high-voltage, current‑mode PWM controller used to regulate a buck converter (drives an external MOSFET; some variants may include a FET).
- Key features: overcurrent/short-circuit protection, undervoltage lockout, thermal protection, soft-start, and adjustable switching frequency.
- Typical use: automotive or industrial power supplies requiring a robust buck regulator.
- External components: external MOSFET (if not integrated), inductor, catch diode, input/output capacitors, and feedback network.
- Important: exact specs (input range, protection details, pinout, package) vary by variant and vendor. Check the specific datasheet for your suffix.
If you can provide the vendor or suffix, I can give a precise, vendor-specific intro.

Package

Please specify the exact variant (manufacturer and suffix) of L4971. Package type varies by version; common options include D²PAK (TO-263), DPAK, or SO-8 depending on the suffix.

Pinout

8-pin package (DIP-8/SO-8). Function: High‑voltage PWM controller for switch‑mode power supplies (e.g., flyback/buck converters) that drives an external MOSFET and provides startup, current‑mode control, overvoltage/overcurrent protection, and soft‑start.

Manufacturer

- Manufacturer: STMicroelectronics.
- What kind of company: A multinational electronics and semiconductor company (French-Italian-Swiss origin, headquartered in Geneva, Switzerland) that designs and manufactures integrated circuits, semiconductors, MEMS, sensors, microcontrollers, power management ICs, and related components.

Application

- Automotive power management (ECUs, body electronics, infotainment)
- Industrial automation power supplies
- DC-DC buck/boost regulators for telecom and server equipment
- Battery-powered portable devices
- LED lighting drivers and backlighting
- General consumer electronics power rails

Equivalent

Direct equivalents depend on the exact L4971 device (the L4971 name is used for different ST parts). Please confirm the device category (motor driver, regulator, LIN transceiver, etc.) and provide key specs or a datasheet link (voltage, current, interface, package). With that, I can give cross-reference equivalents from TI, NXP, On Semi, ROHM, and others.