L5973D – 2.5 A Step-Down (Buck) Switching Regulator, HSOP-8

Description

L5973D is a monolithic step-down switching regulator developed by STMicroelectronics. It integrates a power MOSFET and control circuitry, enabling efficient DC/DC conversion with a minimal number of external components.

The device operates over a wide input voltage range up to 36 V and can deliver more than 2 A output current depending on application conditions. The output voltage is adjustable from 1.235 V to 35 V, making it suitable for a wide range of power supply designs.

An internal oscillator sets a fixed switching frequency of 250 kHz, allowing the use of compact external components. The device uses a P-channel MOSFET, simplifying design and improving efficiency.

L5973D includes multiple protection features such as pulse-by-pulse current limiting, thermal shutdown, and protection against feedback disconnection, ensuring reliable and safe operation.

It is commonly used in consumer electronics, industrial systems, networking equipment, and DC/DC power modules.

Features

• Step-down (buck) DC/DC converter
• Input voltage range: 4 – 36 V
• Output voltage: 1.235 – 35 V (adjustable)
• Output current: up to 2.5 A
• Fixed switching frequency: 250 kHz
• Integrated P-channel MOSFET
• Low dropout operation (100% duty cycle)
• Internal current limiting (pulse-by-pulse)
• Thermal shutdown protection
• Protection against feedback disconnection
• Synchronization capability
• Enable/Inhibit control input
• Package: HSOP-8 with exposed pad