Wearable devices are getting smarter, smaller, and more power-hungry than ever before. From smartwatches and fitness trackers to medical wearables and AR glasses, the pressure is on for engineers to design ultra-compact, energy-efficient, and multi-functional electronics that can last for days on a single charge.
At the core of this design challenge lies the need for smarter power management. This is where SIMO PMICs (Single-Inductor Multiple Output Power Management ICs) step in—offering a streamlined, compact, and efficient solution tailored for today’s wearable devices.
At DRex Electronics, we provide sourcing and support for low-power PMICs, battery management ICs, and other critical components needed to bring next-generation wearable electronics to market—fast and reliably.
🔍 What Is a SIMO PMIC?
A SIMO (Single-Inductor Multiple Output) PMIC is a power management IC that uses a single inductor to generate multiple regulated output voltages, often from a single battery source.
Instead of using one inductor per output (as in traditional buck or boost converters), SIMO topology time-shares a single inductor across multiple output channels, reducing:
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PCB footprint
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Component count
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Cost and BOM complexity
This makes SIMO PMICs ideal for space-constrained and battery-powered applications like wearables, IoT nodes, and portable medical devices.
→ Explore wearable power solutions at DRex Electronics
⚡ Key Benefits of SIMO PMICs for Wearables
| Feature | Benefit |
|---|---|
| Smaller footprint | Ideal for compact wearable PCBs |
| Fewer external components | Simplifies design and reduces cost |
| High efficiency | Prolongs battery life |
| Dynamic voltage scaling | Adapts power to processing and sensing loads |
| Low quiescent current (Iq) | Optimized for standby and sleep modes |
🧠 Recommended SIMO PMIC Example: MAX77650 from Analog Devices
A standout in the category is the MAX77650 SIMO PMIC from Analog Devices.
📐 Key Specs:
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Up to three buck-boost outputs using one inductor
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Integrated LDO and power switch
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Operates from a 2.7V–5.5V input (perfect for Li-ion batteries)
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Output current up to 100mA per channel
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I²C configurable power sequencing
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Ultra-low quiescent current: 0.95μA
Use Cases:
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Smart earbuds
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Fitness bands
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Smart glasses
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Health monitoring patches
🔗 Analog Devices MAX77650 Datasheet (external link)
🏃 Wearable Power Design Challenges That SIMO Solves
1. Space Constraints
Wearables demand ultra-small PCBs—especially in earbuds, rings, or patches. A SIMO architecture reduces inductor and regulator count, freeing up precious board space.
2. Battery Runtime
High-efficiency regulation and low standby current extend battery life, which is critical in consumer-focused wearables that require multi-day operation between charges.
3. Power Sequencing
Many wearable SoCs, sensors, and radios have strict power-up and power-down requirements. SIMO PMICs often integrate programmable sequencing to handle this automatically.
→ Looking for SoCs and sensor ICs for wearables? Check DRex’s catalog
📱 Real-World Applications
| Application | Why SIMO Helps |
|---|---|
| Smartwatches | Drives processor, display, and BLE radio efficiently |
| Fitness Trackers | Reduces board size and boosts battery life |
| Medical Wearables | Powers sensors and microcontrollers with precision |
| TWS Earbuds | Minimizes noise and battery drain in a tiny form factor |
| AR/VR Glasses | Supports sensors, audio, and wireless modules compactly |
In these systems, every square millimeter of space and every microamp of current matters. SIMO PMICs make it easier to meet both.
🔌 Integration with Companion ICs
SIMO PMICs are often paired with:
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Battery chargers (like BQ25120A from TI)
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Low-power MCUs (like Nordic nRF52 or STM32L series)
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MEMS sensors (accelerometers, bio-monitors, etc.)
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Wireless transceivers (Bluetooth Low Energy, Wi-Fi)
→ Explore TI, STMicro, and Nordic components at DRex
🛠️ Design Tips for SIMO-Based Power Architectures
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Use shared inductor layout guidance to reduce EMI
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Match power rails to the startup sequencing requirements of your SoC
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Choose an inductor with the correct saturation current and ESR
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Optimize sleep mode power using programmable thresholds
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Simulate load transitions to validate stability and efficiency
Need help selecting the right inductor or SIMO configuration?
→ Talk to a DRex Electronics sourcing expert
📦 Why Choose DRex Electronics?
DRex Electronics is your strategic sourcing partner for low-power wearable systems. We specialize in:
✅ Genuine PMICs from Analog Devices, TI, Maxim, and STMicro
✅ Global delivery for engineering samples and mass production
✅ Full BOM support with low lead times and ISO 9001-certified traceability
✅ Expert consultation for power optimization and component cross-referencing
→ Request a quote or consultation
📈 Final Thoughts
The future of wearable technology is thinner, smarter, and more efficient. SIMO PMICs are playing a vital role in this evolution, offering the performance and integration that compact devices demand. By enabling multi-rail power delivery with minimal components, SIMO architecture opens a new window of convenience—and DRex Electronics is here to help you source the components that make it possible.
🛒 Ready to Power Your Next Wearable Innovation?
→ Browse SIMO PMICs and power management ICs at DRex Electronics
→ Contact our sourcing team to find the best components for your design
DRex Electronics – Powering Precision in Every Wearable Innovation.
