STMICROELECTRONICS DC-DC Switching Buck Step Down Regulator Adjustable HSOP-8 - 4V 36V 1.235V 35V 2A

The STMICROELECTRONICS DC-DC Switching Buck Step Down Regulator is a high-performance, monolithic power management IC designed for efficient voltage conversion in a compact surface-mount package. Based on the advanced L5973AD chip, this regulator utilises an internal P-channel D-MOS transistor as the switching element, eliminating the need for a bootstrap capacitor and enabling exceptionally high efficiency, typically around 90%. With a robust switch current limit of 2A, it is capable of delivering over 1.5A DC to the load, making it a reliable power source for a wide array of electronic applications.

Engineered for stability and protection, this device incorporates several sophisticated features to ensure safe and reliable operation. It offers pulse-by-pulse current limiting combined with internal frequency modulation, providing effective constant-current short-circuit protection. Additional safeguards include thermal shutdown and protection against feedback disconnection, enhancing the longevity and durability of both the regulator and the end product. The inclusion of an inhibit function allows for near-zero current consumption during standby or off modes, which is ideal for power-sensitive designs.

Key Features and Specifications

• High Efficiency Design: Internal switching element (typical RDS(on) of 200mΩ) ensures minimal power loss.
• Wide Input Range: Accepts an input voltage from 4V to 36V, offering great flexibility for various power supplies.
• Adjustable Output: The output voltage is user-adjustable from 1.235V to 35V, providing precise control for different circuit requirements.
• High Switching Frequency: Operates at a typical frequency of 500kHz, allowing for the use of smaller external inductors and capacitors, saving valuable board space.
• Comprehensive Protection: Integrates internal current limiting, thermal shutdown, and short-circuit protection.

Variant Details

• Size: 4V 36V 1.235V 35V 2A