L5970D

Voltage Regulators - DC DC Switching Regulators Overview

The L5970D is a monolithic step-down switching regulator from STMicroelectronics, designed to deliver up to 1 A of output current. It supports adjustable output voltages ranging from 1.2 V to 35 V with an operating input voltage range of 4.4 V to 36 V. The device integrates an internal P-Channel D-MOS transistor with a typical on-resistance of 250 mΩ and operates at a fixed switching frequency of 250 kHz. Key electrical parameters include a static current of 2.7 mA, a 3.3 V reference voltage with ±2% accuracy, and thermal shutdown protection. It is housed in an SOIC-8 package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an internal P-Channel D-MOS switching element to minimize external component size
• Features pulse-by-pulse current limiting with internal frequency modulation for short-circuit protection
• Provides low dropout operation with 100% duty cycle capability
• Includes inhibit function for zero current consumption

Voltage Regulators - DC DC Switching Regulators Applications

• Computer-related applications utilizing 5V bus architectures
• High intensity LED driver circuits
• General purpose step-down DC/DC conversion systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific ordering suffix when purchasing, as variations such as L5970D013TR indicate different packaging formats like tape and reel compared to standard tubes. Confirm that the required package type aligns with your PCB assembly capabilities. Ensure compatibility with the intended input voltage range and load requirements before finalizing procurement decisions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select the L5970D for designs requiring a single output channel with up to 1 A capacity. It is suitable for applications needing a fixed 250 kHz switching frequency to balance efficiency and component size. Consider the L5973D if higher current delivery exceeding 2 A is necessary, or the L5970AD if a higher switching frequency of 500 kHz is preferred for further miniaturization.

Voltage Regulators - DC DC Switching Regulators Part Context

The L5970D belongs to the L5970 series of power management integrated circuits manufactured by STMicroelectronics. This series focuses on efficient buck conversion solutions for embedded systems. The component is classified under PMIC - Power Management ICs and serves as a core switching regulator for converting higher input voltages to stable lower output levels in compact form factors.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The L5970AD is a compatible alternative within the same family, offering similar functionality but with a higher switching frequency of 500 kHz and an increased switch current limit of 1.5 A. Designers should verify pinout compatibility and adjust external component values to accommodate the frequency change.