AD1991ASVZ

Overview

The AD1991ASVZ is a Class D/1-Bit audio power output stage manufactured by Analog Devices Inc. It supports 2-channel BTL or 4-channel single-ended configurations. The device operates with 5 V analog and digital supply voltages, while the power stage accepts 8 V to 20 V. In stereo mode, it delivers 20 W into 4 Ω at 14.4 V or 20 W into 8 Ω at 20 V. Mono mode provides 40 W into 4 Ω at 20 V. The package is a 52-lead Thin Quad Flat Pack (TQFP) with an exposed pad.

Feature Summary

• Configurable for 2-channel bridge-tied load or 4-channel single-ended operation via mode pins.
• Integrated thermal warning and shutdown protection to prevent damage during overheating.
• Short-circuit and overcurrent protection mechanisms safeguard connected speakers and the IC.
• Clickless mute function suppresses turn-on and turn-off pop noise.

Applications

• PC Audio Systems
• Minicomponents
• Automotive Amplifiers
• Home Theater Systems
• Televisions

Procurement Notes

Verify the specific ordering suffix SV-52 corresponds to the 52-lead Thin Quad Flat Pack package type. Confirm the industrial temperature range of -40°C to +85°C matches system requirements. Ensure the datasheet revision aligns with the intended design specifications. Check for RoHS compliance status if required by manufacturing standards. Validate pinout compatibility with existing PCB layouts before procurement.

Selection Notes

Select this component for applications requiring high-efficiency audio amplification with integrated protection features. Consider the 87% efficiency rating for thermal management planning. Evaluate the need for external heat sinking based on ambient temperature and power dissipation calculations. Ensure the power supply voltage range accommodates the 8 V to 20 V requirement for the power stage.

Part Context

The AD1991 series represents a low-cost DMOS process solution for audio power output stages. It integrates eight transistors arranged as four pairs, functioning as two H-bridges or four single-ended outputs. The device simplifies amplifier design by combining the power stage with control logic, eliminating the need for separate PWM modulators in some configurations.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.