IoT Device Power Management Solution

Application

Description

Complete power management solution for battery-operated IoT devices using Will Semiconductor DC-DC converters and LDOs with BLE connectivity.

Core Advantages

High Efficiency Synchronous buck converter achieves up to 95% efficiency

Ultra-Low Power 40uA quiescent current extends battery life significantly

Clean RF Power Ultra-low noise LDO ensures reliable wireless communication

High Integration BLE SoC with integrated processor reduces component count

Compact Size Complete power solution in under 50mm² PCB area

Recommended Bill of Materials (BOM)

Item	Part Number	Description	Quantity	Datasheet
1	WL2801	Main buck converter	1	📄 Download
2	WL2831D	RF LDO regulator	1	📄 Download
3	WS8226	BLE SoC	1	📄 Download
4	LQM2MPN1R0NG0	1.0uH inductor	1	📄 Download

Applications

Wireless sensors

Smart home devices

Wearable electronics

Asset trackers

Environmental monitors

Technical Specifications

Input Voltage

2.5V to 5.5V (Li-ion battery)

Output Rails

1.8V, 3.3V regulated

Efficiency

Up to 95% at 3.3V to 1.8V

Quiescent Current

40uA (DC-DC) + 150uA (LDO)

Sleep Current

1uA with RAM retention

Solution Size

< 50mm²

Customer Success Stories

Smart Home Sensor Company

Smart Home | Wireless Temperature Sensor

Challenge

Customer needed battery-operated wireless temperature sensor with 5-year battery life from CR2032 coin cell. Required compact size and reliable wireless connectivity.

Solution

Implemented IoT power solution with WL2801 buck converter and WS8226 BLE SoC. Optimized power modes for sensor reading and wireless transmission. Used ultra-low-power sleep modes between transmissions.

Results

Asset Tracking Provider

Logistics | BLE Asset Tracker

Challenge

Customer needed compact asset tracker with 2-year battery life for logistics tracking. Required periodic location reporting and motion detection.

Solution

Designed power-optimized tracker using WL2801 for efficient voltage conversion and WS8226 for BLE connectivity. Implemented accelerometer-based motion detection with intelligent sleep scheduling.

Results

FAE Expert Insights

Robert Lee

Senior FAE - Power Electronics

14 years

Professional Insights

Maximizing battery life in IoT devices requires careful attention to every microamp. The WL2801's 40uA quiescent current is excellent for always-on regulation. I always recommend using the buck converter's PFM mode at light loads for best efficiency. For RF circuits, the WL2831D's low noise is critical - don't compromise on LDO quality for sensitive radio circuits. The WS8226's 1uA sleep current with RAM retention enables quick wake-up without full re-initialization. Power supply sequencing is important - bring up digital rails before analog. For battery life estimation, calculate average current including sleep, active, and transmission periods.

Key Takeaways

Use high-efficiency DC-DC converter with low quiescent current
Implement ultra-low-power sleep modes between operations
Use dedicated low-noise LDO for RF circuits
Optimize wireless transmission duty cycle
Validate battery life through actual measurements

Decision Framework

IoT Power Design Framework

Steps:

Calculate detailed power budget for all operating modes
Select DC-DC converter with high efficiency and low quiescent current
Implement low-noise LDO for RF and analog circuits
Optimize wireless protocol duty cycle for battery life
Implement power gating and sleep modes
Validate battery life through comprehensive testing

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

Frequently Asked Questions

What battery life can be achieved with this solution?

Battery life depends on operating duty cycle and battery capacity. With CR2032 (225mAh) and 10-minute reporting interval, 3-5 years is achievable. For AA batteries (2000mAh), 10+ years is possible. Key factors: sleep current (1-2uA achievable), transmission power and duration, and sensor measurement frequency. Our reference design includes power profiling tools to estimate battery life for your specific use case.

How do I optimize power consumption for my IoT application?

Power optimization involves multiple strategies: Minimize sleep current by powering down unused peripherals

optimize wireless transmission power and interval

use efficient DC-DC conversion with PFM mode

implement event-driven rather than polled operation

batch data transmissions to reduce radio on-time

and use hardware interrupts for wake-up instead of periodic checking. Our FAE team can review your design for power optimization opportunities.

Start with our reference design power profile, then customize for your application. Contact us for power optimization review.

What wireless range can be achieved with WS8226?

The WS8226 BLE 5.0 provides excellent range: Indoor range is typically 30-50 meters through walls

outdoor line-of-sight range exceeds 100 meters

with external PA (WS2400), range can extend to 200+ meters. Range depends on environment, antenna design, and data rate. BLE 5.0's long range mode (125kbps/500kbps) provides 2-4x range improvement over 1Mbps mode. Antenna selection significantly impacts performance.

For extended range, consider external PA or use BLE long range mode. Contact us for antenna design recommendations.

What is the typical BOM cost for this solution?

The complete power and connectivity solution BOM cost is competitive: WL2801 buck converter approximately $0.15

WL2831D LDO approximately $0.08

WS8226 BLE SoC approximately $1.50

and passive components approximately $0.20. Total power/connectivity BOM around $2.00 in volume. This provides excellent value for a complete wireless IoT solution with optimized power management.

How do I certify my IoT device for regulatory compliance?

IoT device certification typically includes: FCC Part 15 for unintentional radiators (USA)

CE marking for European market

Bluetooth SIG qualification for BLE products

and country-specific certifications for target markets. Will Semiconductor's BLE SoC is pre-certified for Bluetooth compliance. We provide certification guidance and can recommend test labs. Typical certification timeline is 4-6 weeks.

Plan certification early in design cycle. Contact us for regulatory compliance guidance and certification support.

What development tools are available for WS8226?

Will Semiconductor provides comprehensive development tools: SDK with Bluetooth stack and sample applications

IDE support for ARM Cortex-M4 development

Evaluation kit with programming interface

Protocol analyzer for debugging

and Power profiler for battery life optimization. Third-party tools like J-Link are supported for debugging. Documentation includes user guides, API references, and application notes.

Order evaluation kit to start development. Contact us for SDK access and development tool recommendations.