AW87359
Awinic AW87359 ultra-low power Class-D amplifier optimized for wearable and IoT devices with extended battery life.
Product Overview
Description
The AW87359 is an ultra-low power Class-D audio amplifier specifically designed for wearable devices and IoT applications where battery life is critical.
This device delivers up to 1.2W output power with industry-leading efficiency and ultra-low quiescent current consumption.
The advanced power management features include automatic shutdown and intelligent wake-up to maximize battery life in always-listening applications.
Product Series
AW
Primary Application
Smartwatches
Key Features
- Ultra-low quiescent current <0.5mA
- High-efficiency Class-D architecture >92%
- Automatic shutdown and wake-up
- Advanced EMI reduction
- Pop and click suppression
- Compact WCSP-12 package
Specifications
| Output Power | 1.2W @ 4Ω, VBAT=3.6V |
|---|---|
| Efficiency | >92% @ 0.3W |
| THD+N | <0.08% @ 0.5W |
| Quiescent Current | <0.5mA |
| Supply Voltage | 2.2V - 5.5V |
| Package | WCSP-12 |
Applications
Smartwatches
Electronic system design
Fitness trackers
Electronic system design
TWS earbuds
Electronic system design
Smart glasses
Electronic system design
Wearable health monitors
Electronic system design
FAE Expert Insights
"The AW87359 is a game-changer for wearable audio applications. The ultra-low quiescent current of less than 0.5mA is exceptional - I've measured it at 0.3mA in typical operating conditions. This translates to weeks of additional battery life for smartwatches and fitness trackers. The automatic shutdown feature is particularly well-implemented - the amplifier quickly powers down when no audio is present and wakes up instantly when needed. The sound quality is surprisingly good for such a low-power device, with clean output and minimal distortion. For TWS earbuds, the small WCSP-12 package fits perfectly in space-constrained designs. I recommend this device for any wearable application where battery life is the top priority."
Ultra-low power consumption ideal for wearable and IoT applications
— Sarah Liu, BeiLuo
Frequently Asked Questions
How low is the quiescent current of AW87359?
The AW87359 achieves industry-leading quiescent current of less than 0.5mA (typical 0.3mA) in active mode. In shutdown mode, current drops to less than 1μA. This ultra-low power consumption is achieved through advanced power management circuitry and efficient Class-D architecture. For wearable applications, this translates to minimal impact on battery life during standby periods. The automatic shutdown feature further reduces power when no audio is being played.
0.3mA typical quiescent current makes AW87359 ideal for battery-sensitive wearable applications.
What makes AW87359 suitable for TWS earbuds?
The AW87359 is ideal for TWS earbuds due to several key features: Ultra-low quiescent current (<0.5mA) preserves battery life in the charging case. Compact WCSP-12 package (1.6mm x 1.6mm) fits space-constrained earbud designs. High efficiency (>92%) minimizes heat generation during extended playback. Fast wake-up time (<10ms) enables seamless audio experience. Low EMI design reduces interference with Bluetooth connectivity. The 1.2W output power is sufficient for small earbud drivers while maintaining clarity at typical listening levels.
Compact size, low power, and fast wake-up make AW87359 perfect for TWS applications.
How does automatic shutdown work?
The AW87359 automatic shutdown feature monitors the audio input signal and automatically enters low-power shutdown mode when no audio is detected for a programmable timeout period (typically 50-200ms). When audio resumes, the amplifier quickly wakes up (<10ms) and begins amplification. This feature is transparent to the user and significantly extends battery life in intermittent audio applications like notifications and voice assistants. The shutdown threshold and timeout are configurable via external resistors or I2C interface (depending on variant).
What is the efficiency advantage of AW87359?
The AW87359 achieves >92% efficiency at typical operating conditions (0.3W output), which is 2-5% higher than typical Class-D amplifiers. This efficiency advantage comes from: Optimized output stage design with low RDS(on) MOSFETs. Advanced modulation scheme reducing switching losses. Intelligent power management that adapts to output level. For a typical smartwatch with 300mAh battery, this efficiency improvement can extend audio playback time by 15-20% compared to standard Class-D amplifiers.
What layout considerations are important for AW87359?
Key PCB layout considerations for AW87359: Place decoupling capacitors (10μF + 0.1μF) as close as possible to the supply pins. Use short, wide traces for speaker output to minimize EMI radiation. Implement solid ground plane with multiple vias for thermal dissipation. Keep digital control lines away from analog audio paths. The exposed pad should be connected to ground with at least 4 vias. For TWS applications, place the amplifier away from the antenna to prevent interference. Awinic provides reference layouts optimized for wearable applications.