Specifications
| Attribute | Value |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Part Status | Active |
| Function | Step-Down |
| Output Configuration | Positive |
| Topology | Buck |
| Output Type | Adjustable |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 4.5V |
| Voltage - Input (Max) | 38V |
| Voltage - Output (Min/Fixed) | 0.6V |
| Voltage - Output (Max) | 38V |
| Current - Output | 3A |
| Frequency - Switching | 250kHz ~ 1MHz |
| Synchronous Rectifier | No |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
Overview
Description
L7986TR is a DC-DC switching regulator IC from STMicroelectronics (L798x family). It’s used to convert a higher input voltage to a stable lower output rail in automotive and industrial applications. The “TR” suffix just denotes Tape & Reel packaging.
Key points:
- Type: Buck (step-down) switching regulator IC (external inductor/diode and input/output capacitors required).
- Protection: typically includes undervoltage lockout, overcurrent/short-circuit protection, and thermal shutdown.
- Features: adjustable or fixed output versions, soft-start, and suitable for automotive voltage ranges (with appropriate input tolerance).
- Packaging: Tape & Reel (for automated assembly).
Common uses: powering microcontrollers and peripherals from 12/24 V automotive or similar high-voltage environments.
For exact electrical specs (input range, output voltage options, current capability, switching frequency, pinout), consult the latest L7986TR datasheet and product page. If you have a specific variant or application, I can tailor the details.
Key points:
- Type: Buck (step-down) switching regulator IC (external inductor/diode and input/output capacitors required).
- Protection: typically includes undervoltage lockout, overcurrent/short-circuit protection, and thermal shutdown.
- Features: adjustable or fixed output versions, soft-start, and suitable for automotive voltage ranges (with appropriate input tolerance).
- Packaging: Tape & Reel (for automated assembly).
Common uses: powering microcontrollers and peripherals from 12/24 V automotive or similar high-voltage environments.
For exact electrical specs (input range, output voltage options, current capability, switching frequency, pinout), consult the latest L7986TR datasheet and product page. If you have a specific variant or application, I can tailor the details.
Equivalent
L7986TR is STMicroelectronics’ 40V automotive buck regulator in the L798x family. There isn’t a direct one‑to‑one drop‑in cross reference. Functionally similar ST parts: L7985/L7987 (same family, similar ratings/footprint). Third‑party options with comparable specs: TI LM2596S/LM2676 and Onsemi NCP1250 series. Always compare Vin, Vout, Iout, switching frequency, and pinout/footprint to ensure compatibility before substituting.
Features
L7986TR is a high‑efficiency automotive buck regulator. Key features typically include:
- Wide input range suitable for automotive use (able to tolerate transients)
- Buck converter with integrated high‑side switch (external diode in non‑synchronous topologies)
- Adjustable output via external feedback network (also available in fixed-output variants)
- Fixed-frequency PWM control for predictable switching and efficiency
- Enable/shutdown input and soft‑start to control start‑up surge
- Protection: undervoltage lockout, overvoltage protection, current limit/short‑circuit protection, thermal shutdown
- Good load/line regulation suitable for automotive power rails
- Optional diagnostic/status outputs on some versions
- Packaging: TR (tape & reel) variants in power packages
Note: exact features and pinout can vary by specific device revision. For precise specifications, consult the official datasheet.
- Wide input range suitable for automotive use (able to tolerate transients)
- Buck converter with integrated high‑side switch (external diode in non‑synchronous topologies)
- Adjustable output via external feedback network (also available in fixed-output variants)
- Fixed-frequency PWM control for predictable switching and efficiency
- Enable/shutdown input and soft‑start to control start‑up surge
- Protection: undervoltage lockout, overvoltage protection, current limit/short‑circuit protection, thermal shutdown
- Good load/line regulation suitable for automotive power rails
- Optional diagnostic/status outputs on some versions
- Packaging: TR (tape & reel) variants in power packages
Note: exact features and pinout can vary by specific device revision. For precise specifications, consult the official datasheet.
Pinout
L7986TR is an 8-pin device (SO-8/TSSOP-8). Function: a buck (step-down) switching regulator with an integrated high-side switch (DC-DC converter).
Manufacturer
- Manufacturer: STMicroelectronics (ST).
- What kind of company: A multinational electronics and semiconductor company (one of the world’s largest semiconductor manufacturers; headquartered in Geneva, Switzerland; formed from the merger of French and Italian-listed companies).
- What kind of company: A multinational electronics and semiconductor company (one of the world’s largest semiconductor manufacturers; headquartered in Geneva, Switzerland; formed from the merger of French and Italian-listed companies).
Application
Application areas of L7986TR:
- Automotive DC-DC buck regulator for 12/24 V vehicle electrical systems (ECUs, sensors, infotainment).
- Constant-current LED driver for automotive and general lighting.
- Power-supply modules in industrial, telecom, and consumer electronics requiring efficient voltage step-down.
- Battery charging and general power-management circuits in portable/embedded equipment.
- Automotive DC-DC buck regulator for 12/24 V vehicle electrical systems (ECUs, sensors, infotainment).
- Constant-current LED driver for automotive and general lighting.
- Power-supply modules in industrial, telecom, and consumer electronics requiring efficient voltage step-down.
- Battery charging and general power-management circuits in portable/embedded equipment.
Package
Package type: Multiwatt power package (TO-220–style) with Tape & Reel (TR) packaging.
