L4931CZ33-AP

L4931CZ33-AP is a fixed 3.3V low-dropout (LDO) regulator from STMicroelectronics (L4931 family). The AP suffix indicates automotive-grade qualification (AEC-Q100), for use in automotive/industrial electronics. It provides a regulated 3.3V output from a higher input voltage and includes built‑in protection features such as current limiting and thermal shutdown. The device typically requires only input and output capacitors (no external feedback network for the 3.3V version). It delivers a modest output current (tens to hundreds of mA depending on package) with a small dropout, allowing operation when Vin is slightly above 3.3V. Common applications include microcontrollers, sensors, and onboard logic powered from 3.3V. For exact electrical specs, pinout, package options, and capacitor recommendations, consult the L4931CZ33-AP datasheet.

Here are the typical features of the L4931CZ33-AP:
- Fixed 3.3 V output buck regulator
- Wide input range, suitable for automotive/industrial use (up to ~40 V)
- Integrated high-side switch; external inductor, Schottky diode, and output capacitor required
- Current-mode control with fixed switching frequency
- Output current capability around 1 A
- Protective functions: undervoltage lockout, overcurrent/short-circuit protection, thermal shutdown
- Soft-start to minimize output overshoot
- Pin-compatible, RoHS-compliant package (AP variant)
- Suitable for automotive environments with rugged operation
Note: External passive components (inductor, diode, capacitor) are required to complete the buck converter.

- Pin count: 8 pins (SO-8 package)
- Function: Fixed-output buck (step-down) regulator with integrated high-side switch. It accepts input on VIN, outputs 3.3 V at VOUT controlled by the feedback pin (FB). Other pins include EN (enable), SW (switch node to the inductor), GND, and soft-start/control pins (SS/CTRL); remaining pins are typically NC or for compensation.

- Manufacturer: STMicroelectronics (ST).
- What kind of company: A multinational semiconductor and electronics company (French-Italian origin) that designs and manufactures a wide range of ICs and components, including microcontrollers, power management, analog, MEMS sensors, and more. Headquarters in Plan-les-Ouates, Geneva, Switzerland.

L4931CZ33-AP is a fixed 3.3 V low-dropout regulator. Typical application areas include:
- Automotive electronics (ECUs, body/sensor modules, infotainment power rails)
- Industrial/automation equipment (controllers, sensors, motor-drive electronics)
- Embedded and consumer electronics (MCUs, DSPs, memories, peripheral rails)
- Battery-powered/portable devices needing a stable 3.3 V rail
- General power-supply regulation in systems requiring a compact, low-noise 3.3 V regulator

PowerSSO-16 (16-pin small-outline package with exposed pad).