L5973AD

Voltage Regulators - DC DC Switching Regulators Overview

The L5973AD is a step-down monolithic power switching regulator from STMicroelectronics. It operates with an input voltage range of 4 V to 36 V and provides an adjustable output voltage from 1.235 V to 35 V. The device delivers up to 2 A of output current and features an internal switching frequency of 500 kHz. It utilizes a P-channel D-MOS transistor for efficient operation without bootstrap capacitors, supporting 100% duty cycle low dropout performance.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a P-channel D-MOS power switch to eliminate the need for external bootstrap capacitors and enable 100% duty cycle operation.
• Includes a synchronization pin allowing the internal oscillator to be locked to an external clock signal.
• Provides comprehensive protection mechanisms including thermal shutdown, inhibit functionality for zero current consumption, and feedback disconnection detection.

Voltage Regulators - DC DC Switching Regulators Applications

• Evaluation on STEVAL-ISA106V1 demonstration board
• Computer-related applications utilizing 5 V bus architectures
• General-purpose DC/DC conversion systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'AD' against official datasheets to confirm the 500 kHz switching frequency variant. Confirm package details are HSOP-8 with exposed pad. Check RoHS compliance status and lifecycle stage directly with the manufacturer or authorized distributors before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 500 kHz switching frequency is required to minimize external component size compared to lower-frequency alternatives. Ensure the application requires an input voltage range extending up to 36 V and benefits from the synchronous rectification capabilities inherent in the P-channel design.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the L5973 family of step-down regulators. While the L5973D variant typically operates at 250 kHz, the L5973AD specifies a higher internal switching frequency of 500 kHz. Both share similar topologies but differ in oscillation characteristics affecting passive component selection.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

L5973D: Similar topology but differs in internal switching frequency (250 kHz vs 500 kHz). Verify if the frequency change impacts external filter requirements.

Voltage Regulators - DC DC Switching Regulators FAQ

Does the L5973AD require a bootstrap capacitor?

No, the device uses an internal P-channel D-MOS transistor which does not require a bootstrap capacitor for driving the high-side switch.

What is the internal switching frequency of the L5973AD?

The internal oscillator fixes the switching frequency at 500 kHz.