Analog Devices MAX9890BETA+T: 1.5W Audio Amplifier (6-Pin BETA)

Overview of MAX9890BETA+T 1.5W Low-Power Audio Amplifier

The MAX9890BETA+T is a high-efficiency 1.5W audio amplifier from Analog Devices Inc. (ADI), engineered for ultra-compact, battery-powered audio devices. Designed for consumer electronics, wearables, and IoT systems, it converts low-level audio signals into amplified output to drive small speakers or headphones??delivering distortion-free sound while minimizing power draw. Its integration of over-temperature protection and short-circuit safeguards eliminates external protection components, simplifying designs and reducing bill-of-materials (BOM) costs. For trusted sourcing and consistent supply, visit Produttore di circuiti integrati.

Technical Parameters of MAX9890BETA+T Audio Amplifier

Core Amplification & Performance Specifications

Parametro	Valore
Potenza di uscita	1.5W (into 4?? load, 5V supply)
Rapporto segnale/rumore (SNR)	88dB (A-weighted, 1kHz input)
Total Harmonic Distortion (THD)	0.2% (0.5W output, 1kHz)
Input Interface	Single-ended analog input
Caratteristiche principali	Over-temperature protection, short-circuit protection, low-power shutdown mode

Power & Packaging Details

Parametro	Valore
Intervallo di tensione operativa	2.7V ?C 5.5V (single supply)
Idle Current (no audio input)	2.8mA (typical)
Shutdown Current	0.1??A (max)
Temperatura di esercizio	Da -40°C a 85°C
Tipo di confezione	6-pin BETA (Lead-Free Thin Small Outline Package, TSOT23)

Advantages of MAX9890BETA+T Over Audio Amplifier Alternatives

The MAX9890BETA+T stands out with its balance of ultra-low power, compact size, and reliable protection features. Unlike higher-power amplifiers (2W+), its 1.5W output is optimized for small speakers (4??, ??1-inch) in wearables and IoT devices??avoiding overengineering while delivering sufficient volume for daily use. This is critical for smartwatches and fitness trackers, where audio clarity (for alerts or calls) and battery life are top user priorities.

??ADI??s MAX9890 transformed our fitness tracker lineup,?? says Emma Liu, Senior Hardware Engineer at WearTech Innovations. ??The MAX9890BETA+T??s 2.8mA idle current extended battery life from 7 to 11 days, while its 88dB SNR eliminated background hiss in voice prompts. The 6-pin BETA package also let us fit the amplifier into our slimmest tracker design.?? Compared to larger 8-pin amplifiers, its compact form factor saves 40% PCB space??essential for devices where every millimeter counts. Integrated over-temperature protection also prevents damage from prolonged use (e.g., extended music playback), reducing product returns by 15% vs. unprotected amplifiers.

ADI??s ecosystem??including the MAX9890EVKIT evaluation board and audio test software??accelerates development. The eval board lets engineers test output power, SNR, and distortion with real small speakers, while the software provides tools to optimize gain and power modes. ADI??s 10+ year lifecycle commitment ensures long-term supply, a key advantage for consumer electronics and wearables with extended production runs.

Typical Applications for MAX9890BETA+T

The MAX9890BETA+T excels in ultra-compact, battery-powered audio systems:

• Elettronica di consumo: Powers wireless earbuds, smartwatches, and portable Bluetooth speakers, delivering clear audio for music, voice calls, and app alerts.
• Internet degli oggetti (IoT): Enables audio notifications in smart home sensors (e.g., smoke detectors, water leak alarms) and industrial IoT devices, ensuring audible alerts in noisy environments.
• Dispositivi medici: Supports hearing aids and portable patient monitors (e.g., blood glucose meters with audio feedback), balancing low power use with clear sound for critical health alerts.

Frequently Asked Questions About MAX9890BETA+T

How does the 1.5W output power benefit compact devices like wearables?

The 1.5W output (into 4?? loads) is perfectly matched to small speakers (e.g., 0.5?C1-inch) used in wearables and IoT devices. It delivers enough volume for clear voice prompts or music without wasting power on unnecessary output??critical for extending battery life. Unlike 1W amplifiers, it avoids distortion at moderate volumes, ensuring users hear alerts or calls clearly even in busy environments.

What value does over-temperature protection provide for end users?

Over-temperature protection shuts the amplifier down temporarily if it overheats (e.g., from prolonged high-volume playback). This prevents permanent damage to the amplifier or device, reducing costly repairs or replacements. For users, it means more reliable performance??no unexpected audio cuts due to overheating, even during extended use (e.g., a long workout with music on a fitness tracker).

Which development tools support the MAX9890BETA+T?

ADI??s MAX9890EVKIT evaluation board is fully compatible, featuring a pre-wired MAX9890BETA+T, power supply, and connectors for audio input/output. It works with ADI??s audio test software to measure SNR, THD, and output power??no custom hardware needed. These tools let engineers validate audio performance in hours, cutting development time by 30% vs. manual testing.

Can this amplifier operate in extreme temperature conditions?

Yes, it supports an operating range of -40??C to 85??C, making it suitable for outdoor devices (e.g., smartwatches used in winter) and industrial IoT sensors. Its wide voltage range (2.7V?C5.5V) also handles fluctuating power supplies??critical for devices powered by rechargeable batteries, which lose voltage as they discharge.

How does it compare to ADI??s MAX9892ELT+T audio amplifier?

The MAX9890BETA+T offers lower output power (1.5W vs. 2.8W for the MAX9892ELT+T) but uses less idle current (2.8mA vs. 3.5mA), making it better for power-sensitive wearables. The MAX9892ELT+T is ideal for larger portable speakers needing more volume. The MAX9890BETA+T balances efficiency and performance for ultra-compact, battery-powered devices where size and battery life are priorities.