LM2676SX-3.3

The LM2676SX-3.3 is TI’s fixed-output buck (step-down) regulator. It takes a high input (up to about 40V) and delivers a regulated 3.3V output at up to ~1.5A.
Key points:
- Topology: Switching regulator with internal control; fixed 3.3V output version (no external divider needed for regulation).
- Frequency and efficiency: Switches at about 50–52 kHz; efficiency depends on Vin and load (typically good for a wide range of conditions).
- External parts: Requires an inductor, a Schottky catch diode, and input/output capacitors.
- Protections: Built-in overcurrent/short-circuit protection and thermal shutdown.
- Package: SX suffix denotes a surface-mount power package suitable for compact designs.
Applications: Ideal for automotive, industrial, and telecom power rails where a robust 3.3V rail is needed from a higher Vin.
For precise pinout, required external components, and thermal/layout guidelines, consult the LM2676SX-3.3 datasheet.

Equivalent buck regulators with a fixed 3.3V output:
- TI LM2596S-3.3
- TI LM2576S-3.3
- Monolithic Power MP1584EN (3.3V version)
- XL Semiconductor XL2596 (LM2596-compatible)
Note: pinouts, package, and inductor values differ; check datasheets for proper layout and replacement.

Here are the main features of LM2676SX-3.3 (Fixed 3.3 V, 3 A version):
- 3 A maximum output current
- Fixed output: 3.3 V
- Input voltage range: 4 V to 40 V
- Switching frequency: ~52 kHz (fixed)
- High efficiency (up to ~90% depending on conditions)
- Internal protection: current limit and thermal shutdown
- Requires external components: inductor, Schottky catch diode, input/output capacitors
- No external feedback resistors needed for fixed output
- Wide operating temperature (typical industrial range: -40°C to +125°C)
- 8-pin surface-mount package variants available (SOP-8/TO-263 style, depending on part)
Note: External components and layout are important for proper operation and efficiency.

LM2676SX-3.3 is an 8-pin fixed-output (3.3 V) switching regulator in an SO-8/MSOP-8 package.
Pin count: 8 pins.
Typical functions (LM2676 family):
- Pin 1: Vin (input supply)
- Pin 2: LX or SW (switching node)
- Pin 3: GND
- Pin 4: FB (feedback)
- Pin 5: EN (enable/on-off)
- Pins 6–8: Reserved/No Connect (often unused)
Notes: It’s a 3.3 V fixed-output step-down regulator that requires external inductor, catch diode, and input/output capacitors.

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and embedded processing ICs; TI acquired National Semiconductor in 2011 and now markets the LM2676 family.

LM2676SX-3.3 is a fixed 3.3V step-down (buck) regulator in the SX package. It accepts inputs up to 40V and provides a high-efficiency, non-isolated 3.3V rail.
Common application areas:
- Automotive power supplies (12–24V to 3.3V)
- Industrial/control electronics (sensors, PLC subsystems)
- Telecom/network equipment power rails
- Embedded systems and consumer electronics (MCUs, memory, FPGAs)
- Battery-powered devices needing a compact 3.3V rail
- Distributed/point-of-load power supplies
Used where a compact, inexpensive 3.3V regulator from higher voltage is required.

LM2676SX-3.3 is available in an 8-pin surface-mount package, typically an SO-8 (SOP-8) package.